Ptc 270 Draft

Transcript

Specification PTC 270: 2000 Interim Arrangements for ADSL CPE Provisional Telepermits Access Standards Telecom Corporation of New Zealand Limited Wellington New Zealand August 2000 i PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 CONTENTS Page Related Telecom Specifications ......................................................................................... ii Other Relevant Documents/Standards ............................................................................... ii FOREWORD....................................................................................................................... iii TELECOM DISCLAIMER ..................................................................................................... v 1. SCOPE........................................................................................................................1 1.1 General....................................................................................................................1 1.2 Specification format ...................................................................................................1 1.3 Marketing features ....................................................................................................2 1.4 Warnings .................................................................................................................2 1.5 General Telepermit requirements ..............................................................................2 2. DEFINITIONS ..............................................................................................................4 3. GENERAL ...................................................................................................................7 3.1 Service outline ...........................................................................................................7 3.2 In-Service Performance ............................................................................................7 3.3 G.992.2 operation.....................................................................................................8 3.4 Radio interference issues ..........................................................................................9 3.5 Telecom-provided components................................................................................ 10 4. TELEPERMIT TECHNICAL REQUIREMENTS ............................................................ 11 4.1 CPE requirements .................................................................................................. 11 4.2 Conformance testing............................................................................................... 11 4.3 Electrical safety ...................................................................................................... 11 4.4 EMC compliance .................................................................................................... 12 4.5 Interference with other Telecom services ................................................................. 12 4.6 Compatibility with voiceband serices on the same line .............................................. 13 5. WIRING AND CONNECTION REQUIREMENTS.......................................................... 15 5.1 CPE connections to network ................................................................................... 15 5.2 Premises wiring requirements ................................................................................. 15 6. PROVISIONAL TELEPERMITTING PROCESS ........................................................... 18 6.1 Supplier preliminary testing ..................................................................................... 18 6.2 Applications for provisional Telepermit testing .......................................................... 18 6.3 Applications for provisional Telepermits ................................................................... 19 6.4 Operation of provisional Telepermits........................................................................ 21 6.5 Provisional Telepermit classes ................................................................................ 22 6.6 Product monitoring ................................................................................................. 22 7. SUPPLIER RESPONSIBILITIES ................................................................................. 23 7.1 Supplier undertakings ............................................................................................. 23 7.2 Advice to customers ............................................................................................... 23 7.3 Product support ...................................................................................................... 24 7.4 Customer Support .................................................................................................. 25 7.5 Offer of “JetStream” Help desk support .................................................................... 26 ii PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 8. TELECOM RESPONSIBILITIES ................................................................................. 28 8.1 Network changes .................................................................................................... 28 8.2 Changes in PTC Specifications ............................................................................... 28 PTC 270: ANNEX A TESTING PROCEDURES FOR “FULL” ADSL CPE........................... 29 A1. Interoperability........................................................................................................ 29 A2. Compatibility .......................................................................................................... 30 A2.1. ATU-R Transmitter PSD.......................................................................................... 30 A2.2 ATU-R Input Impedance and DC Resistance............................................................ 32 A2.3 ATU-R Longitudinal Balance ................................................................................... 32 PTC 270: ANNEX B TESTING PROCEDURES FOR G.992.2 ADSL CPE........................... 34 Note: Annex B is to be issued later Related Telecom Specifications PTC 100: Telecom Permit to Connect: General Conditions TNA 102: Telephone Network General Interface Requirements PTC 200: Requirements for the Connection of Equipment to Analogue Lines PTC 103: Code of Practice for Residential –Type Customer Premises Wiring PTC 1xx Code of Practice for Customer Premises Wiring for ADSL (for future publication) Other Relevant Documents/Standards Australia/New Zealand Standard AS/NZS 3260:1993 Australia/New Zealand Standard AS/NZS 60950: 2000 Australia/New Zealand Standard AS/NZS 3548:1993 (CISPR 22) New Zealand Electricity Regulations: 1997 New Zealand Electrical Codes of Practice Radio Communications Act 1989 iii PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 FOREWORD This Specification defines the initial arrangements and technical requirements for the grant of provisional Telepermits for customer premises equipment (CPE) designed to inter-operate with Telecom’s “JetStream” and related services, using Asymmetrical Digital Subscribers Line (ADSL) transmission. In view of the use of frequencies overlapping the broadcast radio band and the potential for spurious radiation from poorly balanced customer wiring and CPE, measures for limiting the potential for radio interference is a key requirement. This Specification and the arrangements it describes for opening this sector of the CPE market to competitive supply take a cautious approach towards this issue, but may be relaxed in the future. At this early stage in Telecom’s introduction of ADSL technology, provision is being made to open the CPE market based on incomplete information about the technical details of Telecom’s network equipment, which has the capability to “negotiate” connections with various standard types of ADSL CPE. There is also the problem that only some telephone exchanges have so far been fitted with the necessary equipment to supply this service. Even these may not have sufficient equipment to meet customer requirements “on demand” for the first few months. However, Telecom’s aim is to provide CPE suppliers with the opportunity to prepare to enter the market so that they are in a position to market their products en masse by the time the necessary exchange equipment is more widely installed. Suppliers should note that provisional Telepermits for ADSL CPE granted under the terms of this specification are expected to be of relatively short-term validity. Subject to an assurance that electrical safety and EMC requirements have been complied with, Telecom will provide the opportunity for suppliers to connect a sample of their equipment to the network in order to verify or develop their software and verify its basic level of inter-operability. Preferably with evidence of such inter-operability and basic functionality, an application may be made for an accredited testing laboratory to carry out formal testing to confirm compliance with the requirements of this Specification. On receipt of a compliant test report, the supplier may apply for a provisional Telepermit for the product concerned. Provisional Telepermits issued under this Specification will initially be granted for a limited quantity of product. Once this has been installed in customers premises and has been confirmed to operate to the satisfaction of the customers concerned, limitations will be lifted on the quantity that may be connected. iv PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 All provisional Telepermits granted under this interim specification will be withdrawn following publication of the full specification, which is expected to have more technical details and more fully developed testing procedures. Products will then be required to gain “Full” Telepermits in accordance with the new specification. At this early stage in the introduction of ADSL services, Telecom’s aim is to give CPE suppliers the opportunity to source suitable product, set up their supply and support facilities, ensure their products work correctly, and complete the testing and Telepermit process. Hopefully, these processes will be wellestablished by the time Telecom is able to provide a wide-scale network service and has its own processes in place to support the open market. v PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 TELECOM DISCLAIMER While every care has been taken, Telecom nevertheless makes no representation or warranty, express or implied, with respect to the sufficiency, accuracy, or utility of any information or opinion contained in this draft Specification. Telecom expressly advises that the use of or reliance on such information is at the risk of the person concerned. Telecom shall not be liable for any loss (including consequential loss) damage or injury incurred by any person or organisation arising out of the sufficiency, accuracy, or utility of any such information or opinion. In particular, it must be recognised that the ITU Recommendations for ADSL are only at the pre-publication stage and may be subject to change. At least some changes are also expected in Telecom’s network equipment as a result of standards development activities. In view of these factors, Telecom reserves the right to amend this draft specification. It must be stressed that there is no guarantee of full or continued interoperability between Telecom’s network and products granted provisional Telepermits under the terms of this Specification. In addition, any interoperability cannot be guaranteed under all operating conditions likely to be encountered on the Telecom network. vi PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 THIS PAGE IS INTENTIONALLY BLANK 1 PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 1. SCOPE 1.1 General (1) Telecom has introduced a high speed data service known as “JetStream”, which is primarily designed for accessing the internet over a customer’s telephone line, such that both forms of communication can take place simultaneously. There are also variants of this service, for setting up such facilities as “Virtual Private Networks” (VPN’s) or supporting specialised applications, and these will be introduced progressively. Telecom’s “JetStream” and related services use an Asymmetrical Digital Subscribers Line (ADSL) transmission system, currently based on the pre-publication edition of ITU-T Rec. G.992.1. However, the network equipment used by Telecom (the DSL Access Multiplexer or “DSLAM”) will also facilitate interoperability with customer premises equipment (CPE) to the T1.413 Issue 2 and, later, G.992.2 standards. (2) This specification outlines the minimum requirements for ADSL CPE for connection to a Telecom network DSLAM and for the set-up of a data transmission path to the Network Access Server (NAS). This Specification also explains Telecom’s interim arrangements for the grant of a provisional Telepermit to equipment intended to support the “JetStream” and related services. (3) The majority of “JetStream” users will wish to access the internet, and such users will be largely “residential”, as distinct from “business” customers. Suppliers will thus be required to demonstrate that products intended for internet access will indeed communicate effectively with the internet via Telecom’s network. This will be verified as part of the formal testing process. Where other services primarily of a business nature are offered by a product, the supplier will be required to ensure that the product supports those services. It is not proposed that formal laboratory testing will verify all such services. (4) It must be recognised that the requirements of this specification cover basic interoperability, network protection and radio interference limitation matters, but do not purport to be sufficiently complete to ensure that satisfactory operation can be guaranteed, nor that satisfactory operation can be assured under all line conditions. It must be stressed that there may be changes in network equipment and the relevant standards such that, even where operation is initially satisfactory, this cannot be guaranteed in the long term. 1.2 Specification format (1) General background information and requirements forming part of this Specification are printed in plain text in numbered clauses. Comments and notes intended for explanatory purposes and not part of the formal text are printed in italics in a smaller print size, in unnumbered clauses, but preceded with a “•” symbol. 2 PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 (2) The word “shall” indicates a mandatory requirement, all of which must be met in order to qualify for a Telepermit. The word “should” indicates a nonmandatory recommendation of Telecom. The word “may” indicates an option having no consequence to Telecom. 1.3 Marketing features (1) This Specification does not define or restrict the number of facilities, features or operating functions of any equipment and sets no specific requirements for applications other than those relating to “on demand authenticated PPP connection”, such as “JetStream”. Although some CPE may have additional capabilities, these are beyond the scope of this specification. The basic requirement is that the CPE correctly inter-operates with the Telecom-supplied network equipment under a similar range of line conditions to those under which Telecom’s own equivalent CPE products work effectively. • The actual functions and features provided by the equipment are regarded as marketing features to be determined by the product designers. (2) The grant of a provisional Telepermit also requires confirmation that the design complies with the defined interfaces, and that it will not be the cause of interference to or degradation of other Telecom network services. 1.4 Warnings (1) Telecom is mindful of the potential risks for other vendors connecting their CPE at this early stage, particularly when the base standards involved are not finalised. For this reason, this specification must be regarded as “interim”. Significant changes to this specification can be expected as the result of technical developments and field experience gained from a range of different products connected to the network. • Many suppliers are likely to have considerable detailed knowledge of the current standards position and likely changes or developments via representatives on standards working groups. As such, they may well be in a better position than Telecom to assess the level of risk. (2) Any changes to this specification will be incorporated into a later edition or, possibly, a superseding specification. Provisional Telepermits issued against this provisional specification are expected expire when the later specification is published. Suppliers will then be required to arrange further testing against any changed provisions, to qualify for a full Telepermit. 1.5 General Telepermit requirements (1) This Specification shall be read in conjunction with PTC 100, which covers the general conditions applicable to the Telepermit system. • PTC 100 is available on-line free of charge via the Access Standards website, which is http://www.telepermit.co.nz. 3 PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 (2) Where there is any conflict between the requirements of this Specification and PTC 100, the requirements of this Specification shall take precedence. • This is particularly important in the case of ADSL CPE while there is still some doubt about the definition of network interface details. (3) Otherwise; (a) the technical requirements of this specification shall be met by all products submitted for provisional Telepermits and (b) suppliers shall comply with the general arrangements outlined in this specification, especially as regards setting up appropriate support facilities for their products and customers. 4 PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 2. DEFINITIONS 2.1 The terminology and acronyms used in this specification are mostly described in full at their first appearance, or are those used in ITU-T Rec. G.992.1. The following covers the more frequently used terms:2-wire: is Telecom’s standard residential-type premises wiring practice. • 2-wire jackpoints have superseded the earlier “3-wire” jackpoints and wiring system based on British Telecom practices, but retain the same socket assembly and plug type. ADSL: Asymmetrical Digital Subscriber Line • The form of line transmission used by Telecom for “JetStream” and related services. ATU-C: ADSL Transceiver Unit – Exchange End • Generally referred to in this document as a “DSLAM” ATU-R: ADSL Transceiver Unit – Remote End • Generally referred to in this document as the CPE or modem Compatibility: Those functions of the CPE that bear upon the capability of Telecom’s network to perform correctly. • In this specification, this relates to measures to contain harmful crosstalk and radiation, together with issues that would otherwise impair the performance or maintenance of the POTS line. dBm: is the absolute power level of a signal expressed in decibels (dB's) relative to 1 mW. dBrn: decibels referred to –90 dBm, or decibels above a reference power of 10-12 watt. DSLAM: Digital Subscribers Line Access Multiplexer G.Lite: the designation given to the draft standard for splitterless ADSL, originally using a restricted downstream frequency band and designed to avoid the need for a splitter, by making use of separate line filters connected at all jackpoints connecting voiceband CPE. 5 PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 • The “splitterless” approach is not supported at this stage due to its potential for causing radio interference. See “line filter” below. There are also higher speed “variants” of “G.Lite”, which have not yet been investigated by Telecom. Interoperability: Those functions that bear upon the correct operation of the CPE when connected to Telecom’s network equipment. Line filter: a low pass filter used with “splitterless” ADSL systems, such as G.992.2, and fitted at every jackpoint in the customers premises, other than that which is used for ADSL CPE. • The use of line filters is likely to result in unacceptable levels of radio interference in New Zealand due to the wide variability of customer premises wiring, the use of older low performance and poorly balanced cabling and “3-wiring”. In view of this, Telecom requires all installations to be fitted with splitters as part of the service installation. Further work is being done on splitters and line filters and, subject to suitable alternatives, this requirement may be relaxed in the future. NAS: Network Access Server • Equipment which connects on the network side of the DSLAM to enable data to be passed to and from the internet. POTS: “Plain Old Telephone Service” PSD: Power Spectral Density • A parameter used to measure the power levels within a specified bandwidth used for ADSL. Limiting PSD is a key factor in controlling potential interference between services carried on the same cable. Splitter: a type of low pass filter, located at or directly adjacent to the network termination point, which splits the premises wiring into separate high and low frequency paths in order to separate and isolate POTS wiring and CPE from the ADSL pair within the customer’s premises. T1.413: The US standard for ADSL, currently at Issue 2. • The US standard is very similar to ITU G.992.1 in many respects, although there are differences. Telecom’s DSLAM is able to negotiate connections with modems supporting the T1.413, Issue 2 standard. • The ACA/ACIF draft Technical specifications for ADSL CPE are based on the T1.413, Issue 2 standard, so it is likely that these products will be offered in New Zealand. VPN: Virtual Private Network VPI/VCI: Virtual Path Indicator/Virtual Circuit Indicator 6 PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 • A type of message header used for transmitting packets into the network. Appropriate VPI/VCI values must be input by the CPE. 7 PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 3. GENERAL 3.1 Service outline (1) The customer’s physical line terminates at the local exchange on a Nokia V5 DSLAM, which is in accordance with the “Alcatel Reference Model”. It supports ITU-T Rec. G.992.1, ANSI T1.413 issue 2 ATU-R CPE and, later, CPE to ITU-T Rec. G.992.2. The data connection from DSLAM is routed via the ATM network to a Redback NAS. This terminates RFC 2364 PPPoA connections from CPE. The NAS routes data to the required service provider. (2) Telecom’s DSLAM (described as “ATU-C” by ITU) is primarily designed to support customers’ equipment containing a “ATU-R” complying with ITU-T Rec. G.992.1 or the US T1.413, issue 2, providing “full” ADSL. The ITU Recommendation is the base reference for Telecom’s “JetStream” service, the specific application for which is “ADSL over POTS” (Plain Old Telephone Service). POTS is transported as baseband on the physical access pair. (3) The Telecom DSLAM is also expected to support CPE designed to ITU Rec. G.992.2 (previously referred to as “G.Lite”). Nevertheless, to avoid radio frequency interference, Telecom will install a splitter at or directly adjacent to the entry point to each customer’s premises. • “Splitterless” services to G.Lite or G.992.2, based on the use of separate “line filters” at each jackpoint in the customer’s premises, are at risk of significant radio interference because of the undefined nature of much older premises wiring. • Splitters are considered the most reliable approach in view of the widespread use of Telecom’s earlier “3-wiring” which, if connected with line filters, has the potential to cause radio interference at levels exceeding those defined under New Zealand regulations. This matter is currently under study. • There is also a risk that customers initially purchasing G.992.2 CPE may later prefer to replace it with “full speed” G.992.1 equipment. In such cases, any premises not fitted with a splitter would be likely to suffer high levels of broadcast radio interference. 3.2 In-Service Performance (1) ADSL is rate-adaptive and the interoperability requirements of this specification have little significance to in-service performance, which is limited by the characteristics of the physical access line, noise and crosstalk interference from other transmission systems in the same cable. Such effects are not present for the compliance tests specified herein. (2) ITU -T Rec. G.996.1 specifies procedures for assessing the capability of ADSL transceivers to cope with such impairments, with emphasis on crosstalk interference. The PSD requirements of Rec. G.992.1 required by this specification are specifically designed to provide for spectral compatibility with like ADSL lines, other ITU xDSL systems and other ITU standardised 8 PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 transmission systems operating within the same cable. However, there is still a risk that the performance of less capable transceivers will be impaired by crosstalk. Clearly the risk increases with the number of circuits in use over the same cable. Telecom expects the number of such circuits to grow significantly over the next few years. (3) Telecom shall not be liable for any form of compensation to suppliers or users of Telepermitted CPE that suffer loss of performance caused by any imperfections in or additional service demand on Telecom’s network. Though any actual faults will be repaired, Telecom will not undertake upgrading lines beyond normal maintenance limits, simply to improve ADSL performance. (4) In recognition of ADSL performance being dependent upon specific access line characteristics, Telecom uses a computer model to predict downstream line bit-rate. This is accessed from Telecom’s web site http://www.telecom.co.nz under “JetStream” → “Get JetStream” → “check your line”. Telecom accepts no responsibility for the accuracy of such predictions. • These “predictions” should be regarded only as “likely indications” of performance. They are based on the characteristics of Telecom-supplied CPE and should not be assumed to be “minimum performance limits” for either Telecom-supplied or third party supplied CPE. In some marginal cases or where the line is subjected to interference sources, there is a possibility that the service will not operate correctly. (5) Although different ATU-R designs may provide differing data line rates under the same line and network equipment conditions, it is not proposed during this provisional stage, that any minimum performance limit be set for Telepermit purposes under other than the specified test conditions. However, as explained above, Telecom’s “JetStream” service is offered to customers based on their likely download speeds when using a Telecom-supplied ADSL modem. If modems of other types are incapable of providing similar levels of performance under the same line conditions, it may become necessary to determine some “minimum relative download and/or upload speeds”. • The aim of any such requirement would be to avoid customers gaining a poor perception of Telecom’s service due only to the lower relative performance of their modem. 3.3 G.992.2 operation (1) This specification also provides for CPE having only ITU-T Rec. G.992.2 capability. However, such modems will not be permitted to connect in “splitterless” mode until such time as there is clear assurance that such operation will not give rise to unacceptable levels of radio interference. • While the exchange DSLAM will negotiate connections with G.992.2 modems and thereafter transmit downstream, such that signal frequencies above 552 kHz are attenuated, there is still some doubt about the potential to cause radio interference to services operating at the lower frequency end of the broadcast band. Until further notice from the Ministry of Economic Development on these issues, Telecom is mandating the use of splitters. 9 PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 • Because ”G.Lite” now exists in various forms and speed options not yet fully defined, this Specification uses the more specific term “G.992.2”. (2) Where modems or other devices to the lower speed G.992.2 standard are offered for sale, suppliers are to ensure that customers are made aware that such modems are of a lower maximum speed and that, although they may be termed “splitterless”, they cannot be used with line filters installed at all jackpoints. A splitter is to be fitted in all cases, as for the “full” ADSL service. (3) Telecom does not provide a G.992.2 lower speed service, as such. Customers are to be made aware of this and be advised that any savings derived from a lower cost G.992.2 modem are not reflected in a reduced Telecom service charge. The full rental for the relevant Telecom ”JetStream” service will apply, independent of the type of CPE used. • Current world trends are towards “full ADSL” operation. As such, there is now some doubt that G.992.2 or G.Lite CPE will be the dominant type, as originally expected by many manufacturers. The cost of such CPE is likely to be similar to that of full ADSL and, with Telecom’s need to insist on the installation of a splitter, plus the lower speed of these devices for the same service charge, there is little benefit for customers in purchasing this class of CPE. However, Telecom is willing to let the market decide on this issue. • It may be important at some time in the future for modems to be able to support streaming video. This is not the case with G.992.2 CPE and this should be made clear to prospective customers. • Because of the performance limitations of G.992.2 products, the fact that the “JetStream” service is based on the faster G.992.1 standard, and there may be little difference in CPE price, Telecom recommends that all suppliers concentrate their sales efforts on G.992.1 products. 3.4 Radio interference issues (1) “Full” ADSL operation involves frequencies which overlap with those used for medium wave broadcast services. “Full” ADSL operation thus has the potential to cause interference with those radio services unless the splitter and cabling system are carefully installed in accordance with Telecom recommended practices. • The Ministry of Economic Development’s Radio Spectrum Management Division is currently studying the potential impact of ADSL services and considering the need for revised regulations to ensure that interference from these services is kept within acceptable limits. (2) The splitter is a critical component, which has to meet very tight performance specifications in order to restrict interference and avoid degrading voiceband telephone and data services. (3) The splitter characteristics are those described as “Type 1 – European” in Rec. G.992.1 Annex E.1, with the specified European harmonised matching impedance Zcomplex(1) – ie, 150 nF // 750 Ω + 270 Ω. 10 PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 • Initially at least, Telecom will be providing an approved splitter as part of its installation service. (4) In the event that ADSL CPE and/or wiring arrangements not complying with Telecom’s recommendations causes interference to other products and services within the end customer's premises, any remedial action necessary is the direct responsibility of the customer. • Interference problems are currently complicated by there being no regulatory requirement in New Zealand for some minimum level of immunity of products to radio interference. 3.5 Telecom-provided components (1) Because of the need to control radio interference and meet tight performance specifications in order to avoid degradation to telephone and related services, the associated remote POTS splitter is to be installed by Telecom. • The splitter is currently regarded as part of the Telecom Network. As such, it will be provided and installed by Telecom personnel and remain in Telecom ownership until further notice. (2) A separate 2-pair cable to PTC 222, rated to at least category 3 and preferable category 5, will be installed by Telecom between the splitter and the jackpoint designated for connection of the ADSL CPE. • Any 3-wire installations are converted to 2-wire. • Initially, at least, Telecom staff are providing this cable (and jackpoint, where necessary) to ensure compliance with Telecom’s Code of Practice for ADSL wiring to ensure that there is no significant radio interference in the location of each customer’s premises. This work can be carried out during the installation of the Telecom-supplied splitter. This situation will be reviewed in due course. (3) There shall be no other jackpoints and wiring connected to the high frequency network side of the CPE designated for this service. • Required wiring practices are explained in Clause 4.9. 11 PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 4. TELEPERMIT TECHNICAL REQUIREMENTS 4.1 CPE requirements (1) As a basic requirement for the grant of a Telepermit, all customers CPE shall be fully interoperable with Telecom’s Network equipment. (2) The customers ATU-R shall successfully establish a data transmission path through to the NAS. For CPE that includes a router or bridge in addition to ATU-R, the CPE shall establish appropriate additional PPP with NAS to activate a port of the router or bridge. For CPE that relies on the host computer PPP stack, the host shall successfully establish a data transmission path through to the NAS. Data connection beyond this point is beyond the application of this specification. (3) The ATU-R shall have ATM VPI/VCI user configurable to 0/100 respectively. All of Telecom’s ADSL lines are configured in this way, so 0/100 should be the default ATM VPI/VCI setting for CPE connecting to the Telecom network. (4) In order to avoid line imbalance caused by CPE, the longitudinal balance at the line termination of the ATU-R shall exceed 40 dB over the frequency range 30 kHz to 1104 kHz, as specified in G.992.1 Annex A.4.3.1. • This is critical to avoid AM radio interference from radiation by local wiring of transmissions received from ATU-C. 4.2 Conformance testing (1) For “full” ADSL CPE, conformance shall be verified by a Telecom accredited laboratory by means of testing in accordance with Annex A of this specification. For the specified test arrangement, the downstream data line rate for G.992.1 or T1.413 Issue 2 CPE shall be no less than 2 Mbit/s. (2) For G.992.2 ADSL CPE, conformance shall be verified by means of testing in accordance with Annex B of this specification (to be supplied later). • Telecom’s service is “full ADSL” and testing to date has concentrate on this form. Further testing is required to develop and confirm Annex B, which will be added later. 4.3 Electrical safety (1) The electrical safety requirements of AS/NZ 60950 (IEC 60950, previously AS/NZ 3260 or IEC 950) shall be complied with by all CPE items covered by this Specification. (2) Test reports to AS/NZ 3260 or its equivalent shall be supplied by a testing laboratory which is either recognised by Office of the Chief Electrical Engineer 12 PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 of the Ministry of Consumer Affairs (a division of the Ministry of Economic Development), or which is accredited by IANZ or one of its affiliated overseas laboratory registration authorities for electrical safety testing. • A considerable proportion of telecommunications equipment now available was originally manufactured for the North American and Japanese markets, where the mains voltage is only 100-110 V. Such overseas equipment is often designed with inadequate internal clearances between its components to meet New Zealand electrical safety requirements, which are based on 230 V operation. (3) Any separate external power supply used shall also comply with the requirements of AS/NZ 3260 or its equivalent. 4.4 EMC compliance (1) The requirements of AS/NZ 3548 (CISPR 22 or its direct overseas equivalent) shall be complied with by all CPE items covered by this Specification. • The New Zealand requirements for general EMC compliance by items of equipment intended to be installed in customer’s premises are the same as those applicable in most overseas countries, including Australia, which most suppliers seem to regard as a single market with New Zealand. As such, test reports acceptable in New Zealand will generally already be available as the result of testing carried out for other markets. (2) It is a regulatory requirement that test reports to AS/NZS 3548 or its equivalent shall be held by suppliers of this class of equipment and that a formal Declaration of Conformity shall be submitted to the Ministry of Economic Development before such products are offered for sale or put into use in this country. 4.5 Interference with other Telecom services (1) For “full” ADSL CPE, ATU-R transmissions to line shall comply with the Power Spectral Density (PSD) limits of Rec. G992.1 Annex A.2.4, illustrated by the PSD mask in Fig.1. • To avoid interference between services carried over the public network, all signal levels must be restricted to avoid spill-over to nearby users of the same channels. Telecom is responsible for managing the overall operation of its network, including all cables used within that network. In some cases, the frequencies used for ADSL will overlap those used for other services on the same cable. It is thus necessary to ensure that signal levels are not excessive. (2) For G.992.2 ADSL CPE, ATU-R transmissions to line shall comply with the relevant requirements of Rec. G992.2. • Detailed requirements for compliance testing will be published in Annex B, which will be added later. 13 PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 4.6 Compatibility with voiceband serices on the same line (1) POTS band requirements apply at the POTS port of the standard Telecom remote POTS splitter. Conformance shall be verified by test in accordance with Annex A of this specification. (2) The line termination of ATU-R shall include a DC isolating capacitor having a one minute voltage rating no less than 400 Vdc to meet G.992.1 Annex A.4.1. (3) The DC resistance at 250 V dc shall not be less than 5 MΩ. Compliance shall be verified by measurement of the reactive component of the input impedance and its DC resistance, in accordance with Annex A of this specification. (4) The imaginary part of the input impedance shall be in the range -1.1 kΩ to -2.0 kΩ at 4 kHz, as specified in G.992.1 Annex A.4.2.1. 14 PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 ATU-R PSD Mask -30 -34.5 PSD Mask is shown normalised to dBm/Hz into 100 ohms. Actual measurement details are given below PSD, dBm/Hz into 100 ohms (600 ohms for0-4kHz total power) -40 -50 -60 -70 -80 -90 -90 -92.5 -97.5 -100 -110 -110 -111 -120 0 4 25.875 138 307 2130 11040 Frequency, kHz PSD Mask Frequency f (kHz) 0→4 total power 0→4 4 → 25.875 25.875 → 138 138 → 307 307 → 11040 2130 → 11540 1MHz RBW PSD mask PSD Limit (dBm/Hz into 100 Ω , unless stated) -75 dBm into 600Ω an average of –111 dBm/Hz into 600Ω over the band -97.5 -92.5 + 21.5 × log2(f/4) -34.5 -34.5 - 48 × log2(f/138) -90 -110 i.e. max power of –50 dBm in any 1 MHz window 0-4kHz total power into 600 ohms Measurement Details (measured into 100 Ω unless stated) Total power in 0 → 4 kHz, measured into 600 Ω RBW = 12.5 Hz RBW = 100 Hz RBW = 10 kHz RBW = 1 MHz Notes: RBW = Resolution bandwidth. Given RBWs are maximum values to be used. Lower RBWs may be used – however the lower the RBW, the more stringent the PSD limits become. All measurements are made with the ATU -R terminated in 100 Ω, NOT the complex impedance of an ATU-C or a length of cable. PSD limits given are for emissions from the ATU -R alone. Placing a large (>50 dB) 100 Ω resistive attenuation pad between the ATU-C and ATU-R achieves both of these requirements. 0 → 4 kHz band measurements are made at the POTS port of the POTS splitter. All other measurements are made at the U -R interface. G992.1 specifies the band 1630 → 11040kHz as having a max power of –50 dBm in any [f, f + 1 MHz] window. In this specification the band 2130 → 11540 kHz with a 1MHz RBW is specified, as spectrum analysers normally measure power in the [f – RBW/2, f + RBW/2] window. Figure 1. ATU-R PSD Limits (Clarification of Rec. G.992.1 figure A.3) 15 PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 5. WIRING AND CONNECTION REQUIREMENTS 5.1 CPE connections to network (1) Telecom’s standard premises wiring practices are based on the British Telecom plug and socket. Extensive use is now made of “2-wiring”, a balanced adaptation of the earlier 3-wiring developed by British Telecom. Such “2-wiring” is mandated for residential-type premises wiring and will generally be used for connecting “JetStream” and related ADSL services. (2) Connection of the CPE for such applications should preferably be via a BT plug to BS 6312: 1985, using only pins 2 and 5. (3) ADSL CPE providing business-oriented applications and thus likely to be used at customer installations using commercial-type cabling based on North American style 8-way modular jackpoints ( known locally as “RJ 45”), may connect via a mating 8-way plug, using only pins 4 and 5. (4) Where the CPE is designed to connect via a 4 or 6-way North American style modular jackpoint, a suitable adapter shall be provided. Where this option is chosen, user instructions are to warn customers that 4-way or 6-way plugs should not be inserted into an 8-way socket, as there is a risk that the outer pins will be distorted by the shoulders of the smaller plugs. • If this occurs, the socket will need to be replaced due to its no longer being suitable for use with an 8-way plug. (5) Independent of which type of plug is used, under no circumstances shall pin 4 of the 2-wire socket be extended to the ADSL CPE. 5.2 Premises wiring requirements At this initial stage, all wiring between the network and the jackpoint at which the customer wishes to connect the ADSL CPE will be carried out by Telecom as part of commissioning the service. 5.2.1 Premises with residential-type wiring (1) A location for a 2-wire jackpoint, designated for use as the ADSL CPE connection point, should be selected. This should be as close as possible to, but no more than 3 metres from, the location of the customer’s computer. • It is best to keep the CPE and jackpoint close together in order to minimise the length of cordage required and reduce any risk of radio frequency interference. • While the same type of jackpoint is likely to be used for both telephony and ADSL purposes in the same premises, there is no risk of radio interference should either type of CPE be plugged into the wrong jackpoint. While telephone and related devices will operate in the ADSL 16 PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 jackpoint, the ADSL CPE will not operate from the telephone jackpoint. The network does not transmit high frequency signals in these circumstances. (2) A 2-pair cable, Telepermitted in the PTC 222-series, is installed in accordance with Telecom Code of Practice PTC 103, between the Splitter and the 2-wire jackpoint designated as the ADSL CPE connection point. (3) The Orange/Orange-White pair of this cable is used for the ADSL service. No other connections are to be made to this pair. • The Blue/Blue-White pair of the PTC 222 cable may be used for telephony purposes (connected to the low frequency side of the splitter and the other telephone wiring). Typically, a dual outlet (2-line) jackpoint can be used in order to provide telephone access at the computer location. In such cases, the data jackpoint should be clearly marked. (4) Radio interference compliance is compromised by the use of an extension cord, which shall not be used between the jackpoint and the ADSL CPE. • Extension cords normally connect pin 4 of the BT jackpoint and use parallel (untwisted) wires. As such, they may give rise to radio interference. (5) Where existing POTS 3-wiring is connected to a line supporting a “JetStream” service, it is essential that the 3-wire jackpoints be replaced with the current 2-wire versions. • Telecom is investigating whether conversion of 3-wiring will be needed for future privately installed ADSL CPE. 5.2.2 Premises with SOHO-type wiring (1) A 2-pair cable, Telepermitted in the PTC 222-series, is installed in accordance with Telecom Code of Practice PTC 103, between the Splitter and a suitable ADSL termination point within the SOHO panel. • Typically, some SOHO panels may either house the ADSL CPE or provide a crossconnection point such that any RJ 45 8-way modular jackpoint may be selected as that used for the ADSL service. (2) All such cabling shall be Telepermitted to PTC 222 (be at least Category 3 and, preferably, Category 5 rated). (3) Where a SOHO customer sets up a local area network to provide multiple access to the service, the correct operation of that network and its associated equipment will be the customer’s responsibility. 5.2.3 Premises with commercial type cabling (1) In commercial premises with integrated telecommunications cabling systems, such as those to AS/NZS 3080, Telecom provides a splitter at the 17 PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 Building Distributor in order to permit flexibility of connection to any designated jackpoint. (2) Customer requirements will vary at commercial installations from direct connections to a specified jackpoint, through to the fitting of hubs and sharing of the ADSL access over multiple users. Where the customer uses a local area network to provide multiple access to the service, the correct operation of that network and its associated equipment will be the customer’s responsibility. 18 PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 6. PROVISIONAL TELEPERMITTING PROCESS 6.1 Supplier preliminary testing At this stage, full details of the Nokia V5’s implementation of ITU Rec. G.992.1 are not available for publication. This Recommendation contains numerous options and it is expected that these will be defined in a proposed future PTC Specification. In view of this lack of detail, provision is being made for prospective suppliers to undertake their own preliminary testing, by connecting products to Telecom’s “JetStream” service. All such trials are subject to the following conditions:a. Suppliers wishing to avail themselves of this opportunity shall certify that their proposed product complies with the electrical safety and EMC requirements of this Specification. This certification shall be submitted to Access Standards, along with an application to carry out preliminary on-line product testing. b. The application shall state the make and model of each product under test and define the location and telephone number of the line concerned. • A suitable form for making these applications is being published on the Access Standards website http://www.telepermit.co.nz. c. Such preliminary testing can only be carried out at a site which is served by a line capable of receiving “JetStream” service. Telecom does not undertake to provide suitable lines to test locations, where these do not already exist. d. The supplier will be permitted to carry out testing to set up software and confirm the ability of the product to interwork with the JetStream service. 6.2 Applications for provisional Telepermit testing (1) Preferably, following confirmation that the product performs adequately, that the set-up process is properly documented and all software fault-free, the supplier may apply to have formal testing undertaken by an accredited laboratory in accordance with Annex A (for “Full” ADSL) or Annex B (for G.992.2 ADSL). (2) Should any problems come to notice as the result of formal testing, or in the light of actual service experience, Telecom reserves the right to amend the Annex A or Annex B test criteria . 19 PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 (3) A sample of the product concerned, together with full set-up and operating instructions, all necessary software for the equipment, including procedures for setting up on a customer’s line, are to be sent to the accredited laboratory. • A list of accredited laboratories can be found on the Access Standards website. • Telecom’s Engineering Support Laboratory has been set up to do this class of testing. Arrangements will be put in place to accredit one or more independent Testing Authorities to certify testing against this or subsequent specifications. One of the aims of this provisional Specification is to verify the adequacy of testing procedures and determine whether there is any need to expand the range of tests. • Products that have been certified by the Nokia Interoperability Test Program are not exempted from any requirements of this specification. (4) The accredited test laboratory will levy charges for the testing carried out in accordance with Annex A or Annex B, as is done for other PTC compliance testing work. • The rates charged for testing work will be set by the laboratory concerned. (5) In the event of any problems, Telecom’s Engineering Support Laboratory reserves the right to conduct such additional tests as they consider necessary to confirm compliance with network requirements. (6) A formal test report will be returned to the applicant. (7) With the agreement of the applicant, the sample unit submitted for testing will be retained by Telecom during the provisional Telepermit period. It will then be available for checking on-going network support in the event of customer complaints. 6.3 Applications for provisional Telepermits (1) In those cases where the Telecom test report indicates compliance with this Specification, an application may be made for a provisional Telepermit. (2) Applicants for Telepermit shall, as part of their application, submit full details of the after-sales support to be provided for the New Zealand market. These details shall include “free-calling” contact numbers and all other relevant information for arranging close liaison with Telecom’s own JetStream Help Desk. • The details will be checked by Telecom against the requirements of Section 7, in accordance with Telecom’s fault handling processes, to ensure that the system avoids dispatch of a Telecom service person to the customer’s premises and other related costs to Telecom. • Suppliers are advised to carefully consider their ability and willingness to provide the level of support required before applying for a provisional Telepermit. 20 PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 (3) The applicant shall provide the following documentation in support of a provisional Telepermit application:(a) a complete description of the equipment and its features, with a block diagram of its connections; (b) operation and service manuals and software for the equipment, together with a summary sheet of procedures for setting up “JetStream” service on a customer’s line, the significance of any control screens or supervisory signals on the CPE, and clear instructions to users on how to go about getting supplier support; (c) a copy of the product brochure outlining the capabilities of the product; (d) a copy of the electrical safety test report for the product and for any external power supplies that are intended to be used with the product; (e) either a copy of the EMC test report, or a copy of the Declaration of Conformity submitted to the Ministry of Economic Development, or a copy of the Ministry’s acknowledgement of that Declaration. (f) Colour photographs of the product, showing internal and external views of the product in sufficient detail for clear identification of the circuit board layouts and components • A “provisional Telepermit” application form is published on the Access Standards website. (4) Where available, it is recommended that the applicant should also provide a copy each of the following:(a) A copy of any independent inter-operability laboratory test report for the product concerned, which indicates the level of interoperability with a Nokia V5 DSLAM; • Telecom encourages suppliers to submit their products to independent testing houses, such as that operated by the University of New Hampshire before they are introduced into New Zealand. Where such testing has already been carried out, Telecom has a higher level of confidence that the product will perform under less than optimum line conditions • This will help to ensure that the overall quality of service, as perceived by a customer, is maintained at optimum level for that particular customer’s line conditions. (b) A copy of any test report from a Nokia certification laboratory showing the level of inter-operability achieved against a Nokia V5 DSLAM; 21 PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 (c) A copy of any performance reports from reference markets where the equipment is already in use. (5) Applications for provisional Telepermits shall be submitted to Access Standards on the specified Telepermit application form, together with all supporting items listed above. These should all be sent direct to Access Standards 6.4 Operation of provisional Telepermits (1) In view of the current level of uncertainty over some aspects of this specification, suppliers gaining provisional Telepermits will be required to use a high degree of discretion in releasing their product to market and in making any commitments to prospective customers. To ensure that this uncertainty does not result in service problems that could potentially impact on the supplier, customers and Telecom, an adaptation of the Limited Permit Trial will be used for ADSL CPE. (2) Interoperability between the Telecom network and any type of equipment covered by this Specification is necessary for satisfactory operation. To ensure that acceptable interoperability is achieved, the equipment, as installed, is required to fully conform with the requirements of this Specification. • It is not possible to guarantee interoperability in every conceivable situation and, similarly, it is not possible or practicable for Telepermit testing to cover every situation. • Comprehensive testing of every possible condition likely to arise in practice would, in any case, not only be very expensive, but would also be very difficult to achieve with any degree of certainty. (3) The grant of a provisional Telepermit will provide the supplier with the opportunity to connect up to 100 units of the product concerned. The performance of this first 100 units is to be monitored by the supplier’s support facilities, which shall deal with all related customer problems, whatever their actual cause. (4) Where any common problems are found to be occurring, the supplier’s help desk shall inform the Telecom JetStream Help Desk of the details and defer further sales of that product until such time as those problems have been solved. All such remedial action is the responsibility of the supplier. • During the “provisional” stage, there may be some advantage in suppliers concentrating their initial sales efforts on one geographic area in order to confirm adequate operation of their support systems before they are faced with large numbers of customers. This same approach may be used by Telecom in some cases. (5) When the supplier is confident that there are no common problems due to the performance of the product and its software, and that the first 100 units are 22 PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 operating to the satisfaction of the customers concerned, the supplier shall notify Access Standards. • This adaptation of Telecom’s Limited Permit Trial system, as used for other complex products, provides an opportunity for suppliers to gain service experience with their equipment in those cases where a specific characteristic or feature is not clearly defined in PTC Specifications. (6) Access Standards will check performance with Telecom’s JetStream Help Desk and, if satisfied that there have been no serious or frequent complaints, will authorise the supplier to sell that product without further quantity restrictions. This open sale will continue until such time as the provisional Telepermit is withdrawn following the publication of a replacement PTC specification. 6.5 Provisional Telepermit classes (1) Provisional Telepermits will be granted in two separate classes: (a) CPE to ITU Rec G.992.1 and T1.413, Issue 2, will be granted provisional Telepermits in the PTC 272-series; and (b) CPE to ITU Rec G.992.2 will be granted provisional Telepermits in the PTC 273-series. • CPE items which were compliant with the earlier V3 DSLAM’s were granted Telepermits in the PTC 271-series. The use of different number series will assist support staff in identifying the type of CPE used by customers, especially where they are diagnosing problems from a remote location. (2) The above number series will be phased out and replaced with two new series following publication of a replacement PTC Specification. 6.6 Product monitoring (1) In the event of service problems being reported to Telecom, or complaints over operation during or after the initial trial period, Telecom reserves the right to request a further production sample. The sample provided shall be of the product, as offered for sale, complete with current software and installation instructions. This sample will be used to determine whether any changes have been made which affect compliance with PTC requirements. (2) Based on the results of service experience, Telecom reserves the right to review the Telepermit grant and the requirements of this Specification. • This may arise in the event of network changes or problem reports affecting a significant proportion of installations or the CPE associated with them. 23 PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 7. SUPPLIER RESPONSIBILITIES 7.1 Supplier undertakings (1) As with all Telepermit applications, the prospective Telepermit Holder is to undertake to comply with the general conditions published in Specification PTC 100, with the conditions of this Specification, and with any special conditions associated with a particular provisional Telepermit grant. • This undertaking is formalised in the Telepermit application form, but suppliers should recognise that special conditions apply with respect to the need to have their products reassessed in accordance with the requirements of the specification that will replace this provisional document. (2) Suppliers are held responsible for ensuring that their products perform in accordance with any claims made on behalf of those products. • This is, in any case, a basic requirement of New Zealand consumer protection legislation. 7.2 Advice to customers (1) While many CPE items may be provided with a comprehensive and detailed instruction manual, it is recommended that suppliers also prepare a simple set of “walk through” instructions for customers to cover their specific procedures for connecting to “JetStream”. Such instructions should also clearly cover the use and significance of any supervisory signals or control screens that appear in the event of a service fault. • In particular, there should be clear advice on any such indicators or screens that clearly define whether service interruption is “network -related” or “CPE-related”. (2) Suppliers shall ensure that their retailers are instructed to always check with a prospective customer as to the availability of service to that customer before offering to sell ADSL CPE. • Checks can be made via the “JetStream” website, using the customer’s telephone number for the line to which the service is to be provided. • The Telecom website indicates whether or not the customer’s local telephone exchange is equipped with DSLAM’s. It does not, at this stage, confirm that service will be immediately available. • Note that the information given has proved reasonably accurate to date, other than for a very low percentage of lines which are marginal or unable to provide the service due to external noise sources which are not covered in Telecom’s network records. It is recommended that suppliers offer refunds in such circumstances. (3) ADSL CPE covered by this Specification is intended to connect to the V5 version of Telecom’s DSLAM. This may not be available in all areas served by “JetStream” for the first few months after publication of this Specification. In 24 PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 view of this, it is important that suppliers take steps to ensure that their retailers check the availability of suitable exchange equipment before selling CPE to a prospective customer. (4) While the accredited testing laboratory will carry out functional testing of ADSL CPE intended for residential access to the internet under what may be termed “relatively ideal test conditions”, it is not assessing performance under the operating conditions of a typical customer’s line. Similarly, the laboratory will not be carrying out functional testing of other services offered by more specialised products. In view of this, suppliers are to make it quite clear to customers that Telecom cannot give any assurance that the performance of a non-Telecom product will be as indicated on the “JetStream” website . • This will generally be covered by a warning to be included in the User Manual, but it should also be made clear in product brochures. (5) Suppliers are to ensure that customers are made aware of the need to apply to Telecom for the service most appropriate to their needs, that charges will be incurred for its installation, and that this work will include provision of a splitter and jackpoint to be associated with the Telecom service. • The relevant charges are defined in Telecom’s product information on “JetStream” and related services. There are various prices according to the number of MegaBytes the customer expects to download each month. (6) Any supplier of G.992.2 or other “low” speed modems is to make clear to prospective customers that, while the product only has the potential to support a lower speed than “full” ADSL CPE to G.992.1, there is no discount on the price charged by Telecom, which applies to its “full speed” service. (7) Suppliers are to instruct their customers to advise Telecom of the Telepermit number of their CPE when applying for “JetStream” service. • This will help in identifying the particular type of CPE in the event of any fault being reported and assist Telecom Help Desk staff to determine the appropriate supplier should it be necessary to refer the customer to the supplier’s support facilites. 7.3 Product support (1) Suppliers are required to provide full support for all product sold to customers, including prompt response to in-service software or hardware problems revealed during service. (2) Suppliers shall withdraw from further sale any products which have been found to give rise to inter-operability problems in service or require modification before use. This applies regardless of compliance with this specification and regardless of the application being used, whether or not this is specifically covered by this specification. 25 PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 (3) Where service problems are reported and found due to product shortcomings, modification shall be carried out to Telecom’s satisfaction before the product concerned is again offered for sale. • Failure by suppliers to take the above action promptly will result in immediate suspension or cancellation of the Telepermit. (4) The supplier’s responsibility for dealing with and resolving problems at any particular installation includes resolving any matters of compatibility between the ADSL CPE and any other equipment connected by a customer to the same line. In addition, all reasonable efforts are to be made to determine clearly that a problem is due to some aspect of the Telecom network before Telecom’s fault services are contacted. • Should Telecom be called in to deal with problems due to incompatibility between various items of customer-owned equipment and no network fault is evident, then a charge will generally be levied. (5) Where an in-service problem develops and Telecom suspects that the product or its software does not comply with the relevant Specifications, or where an unacceptable proportion of a product previously certified as compliant with this specification gives rise to problems, then the Telepermit conditions may have to be amended. 7.4 Customer Support (1) Suppliers whose products are granted provisional Telepermits under the terms of this specification shall: (a) provide a high level of support to users and maintain close liaison with Telecom’s “JetStream Help Desk”; and (b) promptly notify Telecom’s Help Desk of any serious or commonly occurring customer-affecting problems. • The dominant application of ADSL technology is high speed Internet access, marketed by Telecom as JetStream. A high proportion of customers, particularly in the consumer market, will have a limited knowledge of computer systems. They cannot be expected to understand the required relationships of their computer operating system, their browser and their ADSL modem, with the network Digital Subscriber Access Multiplexer (DSLAM) and Network Access Server (NAS) equipment. As experienced vendors will appreciate, such network equipment is subject to regular upgrades which have the potential to impact interoperability with customer equipment. (2) The supplier’s support system may either be a. operated by the supplier’s local agents where they are competent to do so, or 26 PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 b. operated centrally via a national help desk via a “toll-free” number. • Where chargeable “0900” numbers are used for Help Desks, customers will often avoid the charges by calling Telecom’s Help Desk first, as this is a free call. It is important that suppliers make a genuine attempt to ensure that their customers will call them first, as only the supplier has detailed knowledge of the product and its software. In the event that the supplier’s enquiries indicate a network problem, it is preferred that the supplier’s help desk contacts the “JetStream Help Desk” to explain the position on behalf of the customer. This avoids the customer having to repeat details of the problem being experienced. (3) In either case, customers and users shall a. be clearly advised to contact the supplier’s help desk or the customer’s ISP before registering any complaint with Telecom, and b. be given full instructions on how to contact supplier support in the event of malfunction or perceived unsatisfactory performance. (4) Telecom does not commit to respond to problems related to another supplier’s CPE, unless they have been proven to be caused by a network fault. • Telecom’s “JetStream Help Desk” may be able to assist the supplier’s help desk or customer’s ISP where they have an arrangement with the supplier as in Clause 7.5 below. However, they may not have information on all products granted Telepermit. This is why the supplier’s help desk should preferably contact Telecom’s “JetStream Help Desk” on behalf of the customer concerned. • Should customers contact Telecom before it is verified that a problem is due to the network, they will generally be advised of the supplier’s contact telephone number for product support. 7.5 Offer of “JetStream” Help desk support (1) Especially during the initial stages of opening the ADSL CPE market, it is important that Telecom “JetStream” customers are provided with a good standard of service. Even though suppliers are required to provide an adequate level of assistance to their customers and give clear instructions to refer problems to those assitance facilities, it can be expected that some customers will contact Telecom directly. (2) During the provisional Telepermit period, it would be helpful if Telecom’s “JetStream” Help Desk staff were able to “walk” customers through the set-up process for third party CPE to clearly determine whether or not a problem is network-related. To do this, they will need access to each product, its associated software and user manuals and the instruction sheets provided to customers, as recommended in clause 7.2 (1). Suppliers are invited to loan sample products and support information to the “JetStream Help Desk” in order to develop a closer liaison and co-operate in solving problems affecting their customers. 27 PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 • These proposed arrangements should help to avoid any situations where the customer is told by both Telecom and the supplier to “contact the other party, it is their problem”. It is not expected that the above offer will apply for very long. The intention is to co-operate with suppliers during the “provisional period”, so that all parties can learn promptly of any significant problems and thereby arrange immediate remedial action. 28 PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 8. TELECOM RESPONSIBILITIES 8.1 Network changes (1) As explained in this interim specification, it is expected that at least some changes to network equipment can be expected as the result of normal service development processes. Also, of course, the ITU Recommendation is yet to be finalised. Some changes are expected to be very minor, whereas others may have some impact on the continued operation of CPE. (2) As a general rule, largely to avoid burdening both Telecom and suppliers with a host of minor and very detailed changes, Telecom will advise CPE suppliers of network changes, including software up-grades, only where:a. the nature of that change is such that it is known to impact on CPE operation, or b. a network change is found during pre-implementation testing to have any impact on those CPE products which have been marketed by Telecom. (3) Telecom will not undertake to publish details of all other changes in the network which do not meet the above criteria. 8.2 Changes in PTC Specifications Telecom will develop this interim specification to cover new or changed requirements with the aim of publishing such information as is necessary for suppliers to design CPE which will inter-operate correctly with the Telecom network. • This may involve further changes during this interim stage or a new and revised PTC specification which will replace this draft edition. (2) Telecom expects to publish this document and later issues, free of charge, on the Access Standards website. Actual specification changes will be supplemented by further information in the Access Standards Newsletter, as and when required. Such information is likely to include any network changes specified in clause 7.1. • The URL of the Access Standards website is http://www.telepermit.co.nz. 29 PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 PTC 270: ANNEX A TESTING PROCEDURES FOR “FULL” ADSL CPE A1. Interoperability A1.1 Before connecting the equipment as illustrated in Fig. A1, check correct connections of the line cord and any adapters (no connection of BT pin 4). A1.2 Configure CPE under test in accordance with instructions provided by client. CPE under test should be set to use VPI/VCI 0/100 and RFC 2364 PPPoA encapsulation. A1.3 Check ATU-R synchronises with DSLAM. A1.4 Check that ATU-R recovers to a useful state without intervention: a. following temporary disconnection of the line; and separately b. disconnection of the power source. A1.5 Interrogate CPE or host computer messages for PPP or IP abnormalities and record negotiated data line rates. • Note that an artificial line rate is obtained here due to the presence of an attenuating pad. Thus the downstream line rate should be near the maximum capable by the CPE, and upstream rate similar to that obtained on a long line. Requirements are: a. no PPP or IP abnormalities, and b. a downstream line rate of greater than 2 Mbit/s for G.992.1 CPE. PC Ethernet or USB CPE -50dB 100 : 100ohm Telecom POTS Splitter or NIC -50dB 100 : 100ohm PC Telecom POTS Splitter Figure A1 DSLAM Port DSLAM Port 30 PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 A2. Compatibility A2.1. ATU-R Transmitter PSD A2.1.1 To carry out the following tests, connect the equipment under test to an ATU-C via a suitable attenuator, with approved test instruments complying with the following conditions, connected via a Telecom splitter: • The arrangements illustrated in Figures A2, A3 and A4 show the arrangements and instruments currently used by Telecom’s engineering Support Laboratory. These particular instruments are not mandatory. a. The differential probe used in PSD measurements must be low noise (< 116 dBm/Hz into 100Ω), and have great enough dynamic range to process the stop band signals in the midst of the ATU-R transmit signal. Input impedance of the probe shall be greater than 10 kΩ. b. No form of video filtering shall be used, as this would give a distorted view (reduced amplitude) of wideband signals such as ADSL. c. Even with a 50 dB pad between the ATU-C and the ATU-R, the ATUC transmit signal is still greater than the ATU-R PSD being measured in the band 307 kHz to 1104 kHz. A 60 dB pad will overcome this, but not all CPE will sync-up to the ATU-C in this situation. In such cases, the maximum transmit signal from the ATU-C in the DSLAM will need to be reduced to –50 dBm/Hz. A2.1.2 Measure and record: a. Stop-band (0 – 4 kHz) total power. Requirement is –75 dBm (=15 dBrn) maximum. • Telecom uses Fig. A2 for this test. b. Stop-band (0 – 4 kHz) PSD with 12.5 Hz RBW Requirement is –97.5 dBm/Hz maximum. • Telecom uses Fig. A3 for this test. c. Lower transition band (4 – 25.875kHz) PSD with 100Hz RBW Requirement is [–92.5 + 21.5 × log2(f/4)] maximum. This is a straight line on a log frequency scale. • Telecom uses Fig. A3 for this test. d. Passband (25.875 – 138 kHz) PSD with 10 kHz RBW. Requirement is –34.5 dBm/Hz maximum. 31 PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 • Telecom uses Fig. A4 for this test. e. Upper transition band (138 – 307kHz) PSD with 10kHz RBW. Requirement is [-34.5 – 48 × log2(f/138)] maximum. This is a straight line on a log frequency scale. • Telecom uses Fig. A4 for this test. f. Stop-band (307 – 11040 kHz) PSD with 10 kHz RBW. Requirement is –90 dBm/Hz maximum. • Telecom uses Fig. A4 for this test. g. Stop- band (1630 – 11040 kHz) PSD with 1 MHz RBW. Requirement is –50 dBm in any [f →f + 1 MHz] window in the range. • Telecom uses Fig. A4 for this test. NB: this is measured as (2130 – 11540 kHz) with 1MHz RBW, as spectrum analysers generally measure the range [f ± ½RBW]. RBW = Resolution bandwidth. Note 1: Peak PSD is measured with spectrum analyser set to “ensemble average of max”, which causes display of the average value of the PSD peaks measured by successive sweeps. A2.1.2 Record the maximum value in the specified band after several sweeps, when the displayed sweep does not change with further updates. PSD in dBm/Hz is determined from the highest power peak in each frequency range in dBm, and the resolution bandwidth used in Hz, as follows: PSD = peak dBm – 10 log RBW dBm/Hz Note 2: Given RBWs are maximum values to be used. Lower RBWs may be used – however the lower the RBW, the more stringent the PSD limits become. -50dB ATU-R 100 : 100ohm Telecom POTS Splitter 0-4kHz, 600ohm Selective level meter ATU-C -50dB ATU-R 100 : 100ohm Telecom POTS Splitter Figure A2 Use for 0 to 4 kHz PSD Omit for 4 to 25.875 kHz PSD Differential Probe Spectrum Analyser ATU-C HP3560A Figure A3 32 PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 -50dB ATU-R 100 : 100ohm ATU-C Differential Probe Spectrum Analyser Tektronix 2714 Figure A4 A2.2 ATU-R Input Impedance and DC Resistance A2.2.1 With ATU-R powered but disconnected from the line: a. Connect a 400 V dc source that is current limited to 3 mA across the input for one minute: b. Measure and record reactive component of input impedance at 4 kHz. Requirement is –1.1 kΩ to –2.0 kΩ. b. Measure DC current for a voltage of 250 Vdc applied across the input; calculate and record resistance. Requirement is not less than 5 MΩ. A2.3 ATU-R Longitudinal Balance A2.4.1 With ATU-R powered but disconnected from the line, the test set-up illustrated in Figure A5, and with the two 50 Ω resistors very closely matched, such that the balance of the test set up alone (i.e. without the CPE under test) is at least 46 dB across the range 30 kHz to 1104 kHz:A2.4.2 Using the line cord supplied, calculate and record the minimum value of longitudinal balance in the frequency range 30 kHz to 1104 kHz from: LBal = 20 log (el / em ) dB. Requirement is that the minimum value shall exceed 40 dB. 33 PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 50 ohms ATU HPF em 50 ohms Anritsu selective level meter Z = 75 ohms. Figure A5 el Anritsu level generator Z = 75 ohms. 34 PTC 270: 2000 DRAFT FOR PUBLIC COMMENT AUGUST 2000 PTC 270: ANNEX B TESTING PROCEDURES FOR G.992.2 ADSL CPE Testing and Evaluation not yet carried out. Requirements to be added later