ptf ptf 3203A Operation and Maintenance Manual
Document #: 11492 Revision: S
Certificate of Conformance
This certificate confirms that the following equipment:
Unit type: ptf 3203A GlobalTyme GPS Receiver
Serial Number: __________________________
has successfully passed a FINAL ACCEPTANCE TEST and conforms in all respects of form, fit, and function to current specifications, including regulatory requirements and certifications.
Inspected and verified by:
Date:
_____________________
_____________________
For Precise Time and Frequency, Inc
Declaration of Conformity This certificate confirms that the following equipment: Unit type:
ptf 3203A
is in conformity with the relevant provisions of the following standard(s) or other normative document(s): EU EMC Directive 2004/108/EC: ETSI EN 301 489-1, V1.8.1 (2008-04} Electromagnetic compatibility and Radio spectrum Matters (ERM); Electromagnetic Compatibility (EMC) standard for radio equipment and services; Part 1: Common technical requirements EN 55022:2006 Information technology equipment — Radio disturbance characteristics - Limits and methods of measurement EN 61000-4-2: 2001 Electromagnetic compatibility (EMC) - Part 4-2: Testing and measurement techniques - Electrostatic discharge immunity test EN 61000-4-3:2006 Electromagnetic compatibility (EMC) - Part 4-3: Testing and measurement techniques - Radiated, radiofrequency, electromagnetic field immunity test EN 61000-4-4:2004 Electromagnetic compatibility (EMC) - Part 4-4: Testing and measurement techniques - Electrical fast transient/burst immunity test EN 61000-4-5:2006 Electromagnetic compatibility (EMC) - Part 4-4: Testing and measurement techniques - Surge immunity test EN 61000-4-6:2005 Electromagnetic compatibility (EMC) - Part 4-4: Testing and measurement techniques - Electrical fast transient/burst immunity test EN 61000-4-11:2004 Electromagnetic compatibility (EMC) - Part 44: Testing and measurement techniques — Voltage Dips and Short Interruptions immunity test ISO 7637-2:2004 Road vehicles - Electrical disturbances from conduction and coupling - Part 2: Electrical transient conduction along supply lines only EN 61000-3-2:2006 +A1:2009 +A2:2009
Electromagnetic compatibility (EMC) - Part 32: Limits - Limits for harmonic and current emissions (equipment input current ≤ 16 A per phase) EN 61000-3-3:1995 Electromagnetic compatibility (EMC) - Part 3-3: Limits - Limitation of voltage changes, voltage fluctuations and flicker in public low-voltage supply systems, for equipment with rated current ≤ 16 A per phase and not subject to conditional connection EN 55016-1-1:2007 Specification for radio disturbance and immunity measuring apparatus and methods — Part 1-1: Radio disturbance and immunity measuring apparatus — Measuring apparatus Amendment1 (2007) ClSPR16-1-2:2003 Specification for radio disturbance and immunity measuring apparatus and methods — Part 1-2: Radio disturbance and immunity measuring apparatus — Ancillary equipment — Conducted disturbances 5 Amendment1 (2004) Amendment 2 (2006) EN 55016-1-4:2007 Specification for radio disturbance and immunity measuring apparatus and methods - Part 1-4: Radio disturbance and immunity measuring apparatus Ancillary equipment - Radiated disturbances EN 55016-2-3:2004 Specification for radio disturbance and immunity measuring apparatus and methods - Part 2-3: Methods of measurement of disturbances and immunity — Radiated disturbance measurements Amendment 1 (2005) EN 55016-4-2:2003 Specification for radio disturbance and immunity measuring apparatus and methods — Part 4-2: Uncertainties, statistics and limit modeling — Measurement instrumentation uncertainty
EU Low Voltage Directive 2006/95/EC EN 60950-1:2006 Safety of Information Technology Equipment, +A1+A11+A12 including electrical business equipment EU ROHS directive compliance according to Directive 2002/95/EC
Introduction
Congratulations on your purchase of the ptf 3203A GlobalTyme multifunction GPS receiver ! This product meets the highest standards of quality and reliability, and Precise Time and Frequency, Inc wants to insure that you enjoy the maximum benefits and functionality that this unit can provide. The technology within this unit uses the decades of experience in time and frequency applications of our engineering team, to provide a unit that is highly advanced, and gives a very powerful feature set in an inexpensive and compact package, Operation of the unit is straightforward and the contents of this manual are designed to provide a basic understanding of the product, set-up and functionality, and procedures for maintenance and repair. If you have any questions or concerns, please do not hesitate to contact our technical service department who will be pleased to provide assistance. Please help us to live up to our stated objectives, our company motto is: KNOW THE NEEDS AND EXPECTATIONS OF YOUR CUSTOMER…THEN DELIVER! Once again, thank you for purchasing our product, and we look forward to you utilizing Precise Time and Frequency, Inc. for your future time and frequency instrumentation needs.
President Precise Time and Frequency, Inc.
50L Audubon Road, Wakefield, MA 01880, USA Tel: (+1) 781 245 9090 Fax: (+1) 781 245 9099 e-mail: [email protected] www.ptfinc.com
CONTENTS
This manual is applicable to ptf 3203A and ptf units fitted with software version 23 – 2 and above.
1.
GPS Satellite System Description
2.
Technical Overview
3.
Specifications
4.
Unpacking/Inspection/Installation
5.
Operation
6.
Maintenance
7.
Contact Information – Technical Assistance
1. GPS Satellite System Description The Global Positioning System (GPS) satellites consist of a constellation of satellites orbiting at an altitude of 10,400 miles above the earth, each satellite completing one orbit every 12 hours. Ground-based control/monitor stations monitor the health of each of the satellites, as well as providing precision timing updates on a regular basis. The satellite system comprises 24 satellites in six orbital planes inclined at around 60 degrees to the equator, and provides positioning, velocity, and time to user equipment worldwide. GPS satellite positions are known to an accuracy of a few meters, and each satellite carries an ensemble of atomic clocks that are maintained to an accuracy of a few nanoseconds. Now that the selective availability function of the GPS satellites has been disabled, this allows receiver position to be calculated to an accuracy of approximately 10 meters The signal transmitted from each satellite consists of two carrier frequencies, referred to as L1 and L2. The L1 frequency is 1575.42 MHz and the L2 frequency is 1227.6 MHz. To provide enhanced performance for military and other (US Government Authorized) users the L1 signal is modulated with a precision (P) code, and also a coarse acquisition (C/A) code. The GlobalTyme operates on the C/A code transmitted from each satellite. This C/A code, which is unique for each satellite, contains information on the satellite identity for acquisition and tracking. The C/A pseudo random number (PRN) code is a 1023 bit code that repeats at the rate of every millisecond. Operating on the L1 band and utilizing the C/A code transmissions, the ptf 3203A GlobalTyme determines time and frequency by measuring the time of arrival of a precise timing mark transmitted by each of the satellites, and computing the time against it’s known (previously determined and entered) position. This is the basis for the GlobalTyme’s one pulse per second (1PPS) output. As the GlobalTyme time and frequency outputs are determined from satellite transmissions calculated and referenced to the United States Naval Observatory (USNO) through the GPS Master Clock System, then traceability to International Time Scales is provided through data provided by the USA’s National Institute of Standards and Technology (NIST) and the international timekeeper, the Bureau Internationale des Poids et Measures (BIPM) in France.
2. ptf 3203A GlobalTyme - Technical Overview The GlobalTyme automatically acquires and tracks satellites based on health status and elevation angle. To undertake an accurate, three dimensional (latitude, longitude, altitude) position fix, and the unit requires transmissions from at least four satellites. Once accurate position data has been automatically acquired, or manually entered, provision of accurate time and frequency outputs requires only one satellite.
Figure 1. ptf 3203A GlobalTyme Schematic
2.1. Technical Description The ptf 3203A GlobalTyme multifunction GPS receiver architecture is based upon a 35MHz microprocessor interfacing to a standard 12 channel GPS receiver and an FPGA to provide the range of functionality. The GPS receiver input comes from a bullet antenna with 35 dB gain (supplied) connected by means of a 30ft coax cable and TNC input connector to the unit chassis.
Position information (required for accurate time capture) is automatically acquired by the unit, or can be manually entered through the set up controls. The local oscillator fitted can be a TCXO, OCXO or Rubidium. The oscillator is locked to the GPS 1PPS signal by means of a phase locked loop and provides a good quality 10MHz sine wave output, buffered through an RF buffer, to give a standard 1V rms, 13 dBm, 50 ohm output impedance RF signal onto a BNC output connector. GPS status and health is internally monitored and reported on front panel LED’s (power, lock, and fault LED indicators). Ethernet and RS232 monitor/control i/o ports also report antenna fault status. In addition the unit provides a “holdover” clean contact closure on a rear panel connector. The FPGA provides a number of additional internally generated functions including digital i/o capability (E1/T1 telecom, RS485, additional RS232, event timer, programmable pulse rate) which are optionally made available on the unit rear panel if required. Due to the flexibility provided by the FPGA architecture, and available built in i/o buffers, ptf is able to implement special i/o functions upon request. If ordered with this unit, details of any special i/o functions, if any, will be found in the appendix to this manual. Standard unit set-up, monitoring and control is via either the RS 232 (DB9 connector) or Ethernet (RJ 45 connector) interfaces, which allow access utilizing http, or telnet protocols. SNMP is optionally available. Standard unit output functionality includes: 12 Channel GPS engine to provide internal time and frequency reference information, including range autonomous integrity monitoring (RAIM). 10MHz, 1V rms RF sine wave output into 50 ohms 1 PPS ttl output IRIG B (AM) output
2.2. ptf 3203A GlobalTyme - Disciplining Algorithm
One of the most fundamental benefits of a GPS time and frequency system is the attainable accuracy and stability of the generated RF frequency outputs. The RF output is derived from an internal oscillator, and dependent upon the requirements of the application this oscillator can be either a temperature compensated quartz oscillator (TCXO), an oven controlled quartz oscillator (OCXO), or a rubidium atomic oscillator. In order to realize the benefits of the excellent long-term accuracy of the received GPS signals, the internal oscillator is “disciplined” (controlled) by the GPS signal, to insure it is centered on exactly the right frequency. The narrower the bandwidth of the disciplining loop, the more accurate is control of the local oscillator to the desired frequency, however this disciplining has to be implemented with great care, as the noise of the incoming GPS signal can cause the disciplining control loop to become unstable if the bandwidth of the loop is too narrow.
3. ptf 3203A GlobalTyme - Specifications 3.1.1. GPS Sub-system (S/A off) Receiver Architecture
12 parallel channels L1 1575.42 MHz C/A code (1.023 MHz chip rate) Code plus carrier tracking (carrier aided tracking)
Acquisition Time 200s TTFF-cold (with current almanac, (Time To First Fix, TTFF) position, time and ephemeris) 50s TTFF-warm (with current almanac, position, and time) 25s TTFF-hot (No stored information)
Time Accuracy
<10 ns 1 sigma average <20 ns 6 sigma average
Position Accuracy
<10 meters after 24 hr averaging
Tracking Channels
12 Parallel
Dynamic Characteristics: Velocity
1000 knots (515 m/s) maximum at altitudes < 60,000 ft.
Acceleration
4g maximum
Jerk
5 m/s3
Vibration
7.7G rms perMilitary Standard 810E
Antenna
Bullet antenna, 37dB gain, 30 ft cable
3.1.2. Timing and Frequency Outputs, J1 thru J3
The standard ptf 3203A GlobalTyme includes a 10MHz sine wave, 1 pulse per second (PPS), and IRIG B (amplitude modulated), outputs. Additional outputs or inputs may be available if requested on connectors J4 thru J8 – see appendix. J1 – 10 MHz sine wave Amplitude
1V rms into 50 ohm (13dBm)
Accuracy, Long Term (locked to GPS)
< 1 E -14
Table 3.1
J2 – 1 PPS Amplitude Pulse width Rise/Fall time Trigger
4V into 50 ohm >25 micro secs. , < 50 micro secs. < 6 ns Positive (rising) edge
J3 – IRIG B (amplitude modulated) Carrier frequency Modulation Ratio Amplitude
1 kHz 3:1 3V p-p (mark)
J4 – Programmable Pulse Rate The default output for J4 is a programmable pulse rate. Please note that if special i/o has been specified, J4 may be allocated to another function. Please refer to appendix for details. Pulse Rate Amplitude Duty Cycle
1 PPS to 10 MPPS (settable) 4V into 50 ohm 1:1
J5 – Programmable Event Trigger The default output for J5 is a programmable event trigger. Please note that if special i/o has been specified, J5 may be allocated to another function. Please refer to appendix for details. Pulse Rate Amplitude Pulse width Rise/Fall time Trigger
1 PPS to 1 Pulse per day 4V into 50 ohm >25 micro secs. , < 50 micro secs. < 6 ns Positive (rising) edge
3.1.3. Control/Monitor i/o Control/monitor functions are available on a rear panel mounted DB9 RS232 connector. Allowing full remote monitoring and control of the available unit functions. Details and set up of the functions available on this interface can be found in section 5.3 of this manual.
3.1.4. 100/10 Base T Ethernet Control/monitor functions are also available on a rear panel mounted RJ-45 Ethernet connector. Allowing full remote monitoring and control of the available unit functions, together with optionally providing Network Time Protocol (NTP). Details and set up of the functions available on this interface can be found in section 5.4 of this manual.
3.1.5. Power Input Standard AC power input: Input voltage Input Frequency range
100 to 240 V AC 50 to 60 Hz
(optional DC input) Input voltage
18 to 52 V DC
3.1.6. Dimensions Chassis
Height 1.75 Inches. Width 17 Inches. (19 inches with rack ears) Depth 12 Inches Maximum.
3.1.7. Weight Chassis Antenna
< 10 pounds < 1.5 pounds
3.1.8. Environmental Temperature Chassis operating Chassis storage
0 to +50 deg. C -20 to +85 deg. C
Antenna operating
-40 to +85 deg. C
Humidity Chassis Antenna
to 95% RH non-condensing Unlimited
3.1.9. NTP Outputs NTP Version 3 Responds to Unicast and Anycast client requests Multicast optionally on at user specified interval Accuracy is approximately 100 nanoseconds
4. Unpacking/Inspection/Installation
4.1. Unpacking/Inspection The ptf 3203A GlobalTyme together with accessories, is shipped in a custom designed package. Upon receipt the equipment should first be visually inspected for any signs of visible damage. If visible damage is apparent immediate notification should be given to both Precise Time and Frequency, Inc., and the carrier responsible for shipment. Do not discard the shipping container, which should be made available for inspection by the carrier. For purposes of unit reference, the unit serial number located on the rear panel of the unit should be quoted in all communications. The equipment must be installed correctly and should be installed only by qualified technical personnel. This product is also designed for IT power distribution systems with phase-to-phase voltage of 230V. Warning: If connected to an IT power distribution system, the unit is still under voltage even after operation of the protective fuses. BNC Input/output connections are designed for connection to local equipment with the same or adjacent racks, and are not intended for connections outside of a local building. Similarly, the RS232 is for connection to a local terminal and the RJ45 Ethernet connector is for connection to a locally situated, approved basic insulated router or switch.
4.2. Chassis Installation The ptf 3203A GlobalTyme chassis is supplied with rack ears ready for simple installation into a standard 19-inch rack frame/cabinet. For adequate support when mounted into the rack, a rear supporting bar or tray should be used as the rack ears are designed to secure the unit in the rack, NOT to support the full weight of the unit. Attention should be given to the internal rack environment to insure the unit operates within it’s specified operating temperature range of 0 to 50
deg. C also noting that the unit relies upon convection for cooling, so there should be sufficient air flow to accommodate this.
4.3. Antenna Installation Careful attention to antenna installation is critical for obtaining the best performance from this equipment. Equipment connected to the protective earthing of the building installation through the mains connection or through other equipment with a connection to protective earthing – and to a cable distribution system using coaxial cable, may in some circumstances create a fire hazard. Connection to a cable distribution system has therefore to be provided through a device providing electrical isolation below a certain frequency range (galvanic isolator, see EN 60728-11). The adapter or interconnection cable with galvanic isolator shall be installed external to the equipment. The galvanic isolator shall provide electrical insulation below 5 MHz. The insulation shall withstand a dielectric strength of 1,5 kV r.m.s., 50 Hz or 60 Hz, for 1 min. Norway Utstyr som er koplet til beskyttelsesjord via nettplugg og/eller via annet jordtilkoplet utstyr – og er tilkoplet et kabel-TV nett, kan forårsake brannfare. For å unngå dette skal det ved tilkopling av utstyret til kabel-TV nettet installeres en galvanisk isolator mellom utstyret og kabel- TV nettet. Apparatet må tilkoples jordet stikkontakt
Sweden Utrustning som är kopplad till skyddsjord via jordat vägguttag och/eller via annan utrustning och samtidigt är kopplad till kabel-TV nät kan i vissa fall medfőra risk főr brand. Főr att undvika detta skall vid anslutning av utrustningen till kabel-TV nät galvanisk isolator finnas mellan utrustningen och kabel-TV nätet. Apparaten skall anslutas till jordat uttag
Finland Laite on liitettävä suojakoskettimilla varustettuun pistorasiaan
In order to initialize correctly the unit MUST have at least FOUR satellites Ideally a minimum of 5 satellites should be in view so as satellites go out of view over horizon and new satellites come into view, the unit always sees at least 4 satellites without interruption. Also unit stability will be improved when more satellites (up to 8) are simultaneously viewed, therefore, positioning careful positioning of antenna is critical not only units basic functionality but also in terms of optimizing unit performance. The supplied antenna is of the “bullet” type and is enclosed in a weatherproof housing for outdoor installation. The antenna should be mounted in an exposed location with a clear view of the sky, as far as possible free from obstructions. In the Northern hemisphere, south facing locations are preferable. To avoid receiving multi path signals (additional signals reflected from other surfaces) try to avoid placing the antenna close to vertical obstructions that are above the plane of the antenna. An antenna mounting kit is supplied to assist with installation 4.4. Antenna Cable A 30ft RG-58 coaxial cable is supplied with the unit to connect the antenna to the ptf 3203A GlobalTyme chassis by means of a TNC style connector. Sections of the cable that are exposed to the elements should be wrapped with protective, weatherproof insulation. The cable should be fixed with adequate strain relief to avoid strain on the interconnections. Longer cable lengths are available from Precise Time and Frequency, Inc. if required. Note: The chassis should not be powered until the antenna is installed and connected. Functionality of the unit is dependent upon the successfully completing initialization which can only be completed if the unit views at least four satellites. The antenna cable should not be fitted or removed while the unit is powered ON as damage may result to the unit The protective earthing connection shall always to be connected before the any servicing is to be conducted.
4.4.1. Antenna cable length correction Once the antenna cable installation is complete, the actual length of the cable used, in units of meters, should be entered into the unit. This can be entered from the front panel keypad, if fitted, menu 6, or from one of the remote communications interfaces, RS232 or telnet, with command A06. Entering the correct length of the cable is important to insure the unit provides maximum accuracy, as the propagation delay from the antenna to the unit input will cause timing errors if not properly corrected.
4.5. Power Connection Power is supplied by connecting the supplied AC power cable to and AC source, at 100 - 230 V AC, +/-10%. The AC input is a universal input – no range switching is required. 4.6. Timing Input/Output Connections BNC connectors are provided for the standard ptf 3203A GlobalTyme outputs, including the 10MHz sine wave, 1 pulse per second (PPS), and IRIG B (amplitude modulated), outputs. Additional outputs or inputs may be available if requested on connectors J4 thru J9.
4.7. Control/Monitor/Alarm Relay Connections Control and monitoring is available through an RS232 port (female 9contact D connector) and over an Ethernet port (RJ45 connector). The RS232 port is configured as DTE, receiving data on pin 3 and transmitting data on pin 2. Pin 5 is chassis ground, and the other lines are unused. DB9 Connector Pin #
Function
Comments
1 2 3 4 5 6 7 8 9
Alarm Relay NO TX Data (RS232) RX Data (RS 232) Alarm Relay NC Ground (RS232) Alarm Relay Common
Closed when in alarm
Open when in alarm
4.8. Connection Diagram ptf 3203A standard output/input connections are as shown in the picture below:
4 to 8 optional o/p’s J1 TNC Antenna
BNC 1 10MHz J2 RJ-45 Ethernet
J3 DB9 Serial I/O Control/Monitor
BNC 3 IRIG-B
100 to 240 VAC IN
BNC 2 1PPS
Note: If your unit(s) is configured with optional outputs please refer to APPENDIX in the back of this manual.
The table below shows the relationship between the firmware terminology and the physical output connector positions on the rear of the unit:
Firmware terminology IRIG B (hard wired) Digital out 2 10 MHz sine wave (hard wired)
Output (BNC) Connector 3 2 1
Factory setting IRIG B (AM) 1 PPS 10 MHz (sine)
5. ptf 3203A GlobalTyme – Operation
5.1. Initialization From software version 23-2 and onwards the initialization process has been re-organized in order to bring up the Ethernet and keypad functions more rapidly. Due to this the unit will begin to display a time output more quickly, however it should be noted that this displayed time is not synchronized until after the GPS receiver module has been initialized, indicated by the flashing Green “Hold” LED. The following steps are part of the initialization process: Verification of compatible s/w version and CPLD firmware Restoration/initialization of stored “flash” memory parameters Initialization of Ethernet functionality Synchronization of internal oscillator 1PPS Restoration of time/load dummy time Initialization of front panel keypad (if fitted) Initialization of GPS module Initialization of internal Oscillator phase locked loop Initialization is completely automatic but the elapsed time varies depending on the prior conditions. When the receiver is powered up for the first time after installation, the initial date, time, position, almanac, and ephemeris data will be incorrect. This condition forces the receiver into cold start, and it searches for all available satellites. After one satellite is acquired, date, time, almanac and ephemeris data is updated. When three or more satellites are tracked, automatic position computation is initiated.
5.2. Entering Position Information Position information is locked when the unit is in fixed positioning mode. If the user desires a fixed position the unit should be in survey mode to allow changing the fixed position. This also allows for setting all position information to the receiver at the same time. 5.3. DB9 RS 232 Control/Monitor Port 5.3.1. Configuration
The RS232 port factory default setting is 57600-8N1, but may be changed through the RS232 menu. 5.3.2. DELIBERATELY LEFT BLANK
5.3.3. Command Set Commands available on the RS232 serial port are of the form: Letter number space argument1 space argument2 space ... argument n The number immediately following the letter is a two-digit number. e.g.
A01 200 A02 0 A28 PTF
To return the current value of a parameter type immediately after the identifier. e.g.
A01
A comprehensive HELP system is available that can be accessed through the RS232 port.Type; help and the complete set of available commands will be returned. For more comprehensive information on a particular command type; [command letter][command number][space]? e.g. A01 ? returns; Serial Use Name Command Keypad? GPS POS AVGS A01 Yes Number of Averages for GPS positioning Entry type is number Minimum Value : 0 Maximum Value :32000
Current Value 60
The following table details the standard command set available within the ptf 3203A GlobalTyme. Where special functions have been included for particular applications outside of the standard configuration these are listed in a separate appendix.
Function Position Position Position Position Position Antenna Time Time Time Time Time Time Display Display
Outputs Outputs
Outputs Outputs Outputs
Outputs
Outputs
Outputs
Outputs
I/O
Description Number of position averages for fix FIX Latitude in degrees * 1E6 Longitude in degrees *1E6 FIX Height in centimeters Position fix mode, survey or fixed Antenna cable length in meters Local time offset in hours * 10 Daylight savings flag 0n/Off) Daylight savings type US/UK Time mode, IRIG and panel display UTC, GPS, or Local Date, month/day/year Time, hour : minute : seconds Display Brightness (1=bright 15=dim) Time in seconds until display screen blanked with no activity (0=always on) Disciplining clock source GPS, ext. input1, ext. input2, PCLK pclk source, 10MHz, 1PPS, 8.192MHz, 12.352MHz, ext.RF, ext input 1 pclk divisor pclk pulse o/p, 1 clk width, square Digital output 1 frequency 10MHz, IRIG, 1 PPS, PCLK, 1.544MHz, 2.048MHz Digital output 2 frequency 10MHz, IRIG, 1 PPS, PCLK, 1.544MHz, 2.048MHz Digital output 3 frequency 10MHz, IRIG, 1 PPS, PCLK, 1.544MHz, 2.048MHz Digital output 4 frequency 10MHz, IRIG, 1 PPS, PCLK, 1.544MHz, 2.048MHz Digital output 5 frequency 10MHz, IRIG, 1 PPS, PCLK, 1.544MHz, 2.048MHz IP address of this 3203A xxx.xxx.xxx.xxx
I/O Netmask, xxx.xxx.xxx.xxx I/O I/O Admin I/O Time Time
Gateway, xxx.xxx.xxx.xxx DHCP Off or On Administrator Password Baud Rate NTP broadcast time off or on NTP broadcast period, seconds
Data 1 to 65000 -90000000 to +90000000 180000000 to +180000000 -200000 to +4000000 survey or fixed 0 to 100000 -235 to +235 on or off US or UK
Cmnd A01 A02 A03 A04 A05 A06 A07 A08 A09 A10
UTC or GPS or Local xxxx/xx/xx xx:xx:xx 1 to 15
A11 A12 A13
0 to 32000
A14
GPS or Ext In 1 or Ext In 1 or PCLK 10MHz or 1PPS or 8.192MHz or 12.352MHz or Ext RF or Ext In 1 1 to 16777215 1 Clk or square 10MHz or IRIG or 1 PPS or PCLK or 1.544MHz or 2.048MHz 10MHz or IRIG or 1 PPS or PCLK or 1.544MHz or 2.048MHz 10MHz or IRIG or 1 PPS or PCLK or 1.544MHz or 2.048MHz 10MHz or IRIG or 1 PPS or PCLK or 1.544MHz or 2.048MHz 10MHz or IRIG or 1 PPS or PCLK or 1.544MHz or 2.048MHz 000.000.000.000 to 255.255.255.255 000.000.000.000 to 255.255.255.255 000.000.000.000 to 255.255.255.255 off or on xxxxxx 9600 or 19200 or 57600 off or on 1 to 1024
A15 A16
A17 A18 A19
A20
A21
A22
A23
A24 A25 A27 A28 A29 A37 A38 A39
5.3.4. Status and Servo Commands In addition to the standard commands listed above, the ptf 3203A includes two commands for providing summary data on the unit. 5.3.4.1.
Status Command
Format of the entry for this command is The response is as follows; Output Description Parameter Value Operating Mode Unit version number Telnet, SNMP, SNTP,HTTP N/A and capabilities Unit Mode Oven Warm-up Initializing GPS init ------“------FAILED ! ------“-----Locking (+ count) ------“-----Loop OK or HOLD Normal Operation Position Mode Fixed, Complete, or current Normal operation position averaging count (min. 0, maximum 32,000 user selectable)
5.3.4.2.
Servo Command
Format of the entry for this command is The response is as follows; Loop:
"Lock, xxx", "Hold", "Ok" In the "Lock" case then 'xxx' is the number of seconds that the unit is locking. This count goes from 0 to a maximum of 100000, but is normally limited to 120.
Phase:
A number that can vary from +/-99,999,999 and is in 1nS resolution
CV:
A number that can vary from -524288 to +524287 (Oscillator Control voltage, not applicable for Rubidium)
External Phase Either No Ext Phase Or
T: HH:MM:SS PH: -3905764
(if there is no external phase input) (time of the last phase measurement) (the phase measurement – note the last digit represents nano second 100’s, so in this case is; -390,576,400 nano seconds )
5.4. RJ-45 Ethernet Control/Monitor Port
5.4.1. Configuration The default IP address for the ptf 3203A GlobalTyme is 192.168.0.1. This address may be changed via the RS232 port or the front panel. The unit may also be set to acquire an IP address automatically by enabling its DHCP server. Note: Before changing the IP address, the Netmask, or the Gateway, the Ethernet cable should be plugged in and connected to your network, otherwise the unit will appear to stop as the processor will be searching for network information that it cannot find. If the Ethernet cable is plugged in after the unit powers up and dhcp was off and a zero IP, you must enter a valid IP and cycle power for the servers to start. If the Ethernet cable is plugged in after the unit starts and there was a valid IP previously stored, then the servers will start without cycling power.
5.4.2. Command Set and Timeout Using Telnet Client The TELNET interface is accessed through a TCP/IP connection to port 23. The command set is the same as for the RS232 interface. There is also a timeout on the Telnet client set by command A42. The timeout value is entered in seconds, up to a maximum of 100,000. A value of 0 = no toimeout.
5.4.3. Time Protocol The unit provides both ASCII and binary time protocols. These are read by making TCP/IP connections to ports 13 and 37, respectively.
5.4.4. Use with http client When using an HTTP client such as Internet Explorer, the ptf 3203A GlobalTyme serves up an intuitive web page with the control and monitor functionality provided at the front panel and over the RS232 port. When connected to a standard web browser (Microsoft Explorer) via the Ethernet interface the unit first does an authentication procedure. It will ask for a user name and password for access. The user name will always be admin, the password is whatever the unit password is at that time. After authentication the unit serves up the following web page.
PTF 3203a Web Interface Enter the Command Number (Example A01) If you leave the value empty, its current setting will be returned. If you enter a value, you are setting that value for that command. Refer to your manual for valid command numbers and their valid settings. Or click this link Valid Commands Command Number Command Value Submit
Clicking on the “Valid Commands” link will display a list of commands that are valid for use via the web browser. The commands available are shown on the next page. :
Valid Web Browser Commands; A01
R/W
A02 A03 A04
R/W R/W R/W
A05
R
A07 A08 A09
R/W R/W R/W
A010
R/W
A11 A12
R R
Number of position averages for fix Latitude in degrees * 1E6 Longitude in degrees *1E6 Height in centimeters Position fix mode, survey or fixed Local time offset in hours * 10 Daylight savings flag Daylight savings type Time mode, IRIG and panel display Date, month/day/year Time, hour:mute:second
A15
R/W
Disciplining clock source
A24
R
IP address of this 3203A
A25
R
Netmask xxx.xxx.xxx.xxx
A27
R
Gateway xxx.xxx.xxx.xxx
A28 A37 A38 A39 STATUS
R/W R/W R/W R/W R
DHCP Off or On Serial I/O Baud Rate NTP broadcast time NTP broadcast period , seconds Unit Status
1 to 65000 -90000000 to +90000000 180000000 to +180000000 -200000 to +4000000 survey or fixed -235 to +235 ON or OFF US or UK UTC or GPS or Local xx/xx/xx xx:xx:xx GPS or Ext In 1 or Ext In 2 or PCLK 000.000.000.000 to 255.255.255.255 000.000.000.000 to 255.255.255.255 000.000.000.000 to 255.255.255.255 ON or OFF 9600 or 19200 or 57600 ON or OFF 1 to 1024
5.4.5. Network Time Protocol The ptf 3203A as an NTP server becomes the clock synchronization source for your network. Clients can query the server to obtain UTC time accurate to a few tens of nanoseconds. The server can operate in Unicast (point to point), Anycast (multipoint to point) or Multicast (point to multipoint). In unicast mode a client sends a directed message to the Ethernet IP address and SNTP port of the ptf 3203A GlobalTyme. In anycast, a client broadcasts on the SNTP Multicast address (224.0.1.1) and looks for an SNTP server to respond. The ptf 3203A GlobalTyme SNTP server will respond to those broadcasts. Normally the client will set the Time To Live TTL value in the request to limit it’s hops across routers. Multicast is optionally on or off at the users setting. In multicast, the SNTP server will broadcast at 224.0.1.1 the time. Multicast messages are normally sent at poll intervals from 64 s to 1024 s, depending on the expected frequency tolerance of the client clocks and the required accuracy. This poll interval is user settable. The TTL value in a ptf multicast is set to 1 to limit it to the local network. For more information on NTP and SNTP see RFC’s 1305 and 2030. Also the NTP website at http://www.ntp.org/
5.4.6 Simple Network Management Protocol (SNMP) The ptf 3203A system has a running SNMP agent. Any standard SNMP client is able to communicate with this agent. The means by which a client knows how to access data on the agent is through an SNMP Management Information Base, or MIB. Below are two visual pictures of the MIBS (what the SNMP manager views). The first is a query of the information and the second is the tree structure. When the SNMP option has been included, the user will be provided with the MIBS, see later. The provided MIBS files should be compiled and inserted into the user’s manager. When the users manager queries the network it will see the ptf 3203A has SNMP and link in the provided MIBS.
SNMP Query Display
Tree Structure
This section defines the MIB. The MIB then defines the following fields: ----------
************************************************************** ************************************************************** -- Copyright 2003 Precise Time and Frequency Inc DESCRIPTION: This file contains the PTF 3203 Global Tyme private MIB. ************************************************************** **************************************************************
PRECISE-MIB DEFINITIONS ::= BEGIN
IMPORTS OBJECT-TYPE FROM RFC-1212 preciseinc, ptfproduct, ptfmodules, ptfdata, system FROM Precise-SMI;
-- 1.3.6.1.4.1.18507.1 precise_name OBJECT-TYPE SYNTAX OCTET STRING ACCESS read-only STATUS mandatory ::= { preciseinc 1 } -- 1.3.6.1.4.1.18507.2 precise_phone OBJECT-TYPE SYNTAX OCTET STRING ACCESS read-only STATUS mandatory ::= { preciseinc 2 } -- 1.3.6.1.4.1.18507.3 precise_email OBJECT-TYPE SYNTAX OCTET STRING ACCESS read-only STATUS mandatory ::= { preciseinc 3 } -- So it goes mgmt - mib2 - system - ptfproduct -producttype -- assume only one 'product' or device handled by one resident snmp agent -- on that product -- 1.3.6.1.2.1.1.1.1 product_type OBJECT-TYPE
SYNTAX OCTET STRING ACCESS read-only STATUS mandatory ::= { ptfproduct 1 } -- 1.3.6.1.2.1.1.1.2 product_version OBJECT-TYPE SYNTAX OCTET STRING ACCESS read-only STATUS mandatory ::= { ptfproduct 2 } -- 1.3.6.1.2.1.1.1.3 product_location OBJECT-TYPE SYNTAX OCTET STRING ACCESS read-write STATUS mandatory ::= { ptfproduct 3 } -- 1.3.6.1.2.1.1.1.4 location_support_phone OBJECT-TYPE SYNTAX OCTET STRING ACCESS read-write STATUS mandatory ::= { ptfproduct 4 } -- 1.3.6.1.2.1.1.1.5.1 has_sntp OBJECT-TYPE SYNTAX OCTET STRING ACCESS read-only STATUS mandatory ::= { ptfmodules 1 } -- 1.3.6.1.2.1.1.1.5.2 has_telnet OBJECT-TYPE SYNTAX OCTET STRING ACCESS read-only STATUS mandatory ::= { ptfmodules 2 } -- 1.3.6.1.2.1.1.1.5.3 has_snmp OBJECT-TYPE SYNTAX OCTET STRING ACCESS read-only STATUS mandatory ::= { ptfmodules 3 } -- 1.3.6.1.2.1.1.1.5.4 has_http OBJECT-TYPE SYNTAX OCTET STRING ACCESS read-only STATUS mandatory ::= { ptfmodules 4 }
-- 1.3.6.1.2.1.1.1.5.5 has_fsync OBJECT-TYPE
SYNTAX OCTET STRING ACCESS read-only STATUS mandatory ::= { ptfmodules 5 } ----- 1.3.6.1.2.1.1.1.6.1 up_time OBJECT-TYPE SYNTAX TimeTicks ACCESS read-only STATUS mandatory ::= { ptfdata 1 } -- 1.3.6.1.2.1.1.1.6.2 is_loop_in_holdover OBJECT-TYPE SYNTAX OCTET STRING ACCESS read-only STATUS mandatory ::= { ptfdata 2 } -- 1.3.6.1.2.1.1.1.6.3 num_unicast_sent OBJECT-TYPE SYNTAX Counter ACCESS read-only STATUS mandatory ::= { ptfdata 3 } -- 1.3.6.1.2.1.1.1.6.4 num_anycast_sent OBJECT-TYPE SYNTAX Counter ACCESS read-only STATUS mandatory ::= { ptfdata 4 } -- 1.3.6.1.2.1.1.1.6.5 num_multicast_sent OBJECT-TYPE SYNTAX Counter ACCESS read-only STATUS mandatory ::= { ptfdata 5 }
-- 1.3.6.1.2.1.1.1.6.6 fsync_status OBJECT-TYPE SYNTAX OCTET STRING ACCESS read-only STATUS mandatory ::= { ptfdata 6 } -- 1.3.6.1.2.1.1.1.6.7 num_traps_sent OBJECT-TYPE SYNTAX Counter ACCESS read-only STATUS mandatory
::= { ptfdata 7 }
--- Command and Control --- 1.3.6.1.2.1.1.1.6.8 send_traps_if_1 OBJECT-TYPE SYNTAX Counter ACCESS read-write STATUS mandatory ::= { ptfdata 8 } -- 1.3.6.1.2.1.1.1.6.9 snmp_mgr_ip OBJECT-TYPE SYNTAX OCTET STRING ACCESS read-write STATUS mandatory ::= { ptfdata 9 } END
5.5. Display Screens 5.5.1. Initialization: at initial turn-on, the unit first acquires satellite information. During primary initialization, the logo and a number of screens with status information are shown. Primary initialization consists of serial port initialization, Ethernet initialization and preliminary time downloaded from the battery backed RTC.
5.5.2. GPS Engine Initialization During this phase, the front panel “Fault” LED will be ON (amber), and the “Lock” LED (green) will be flashing. Once the primary initialization is complete, the unit enters initialization of the GPS engine itself. Depending on the position mode selected, the time taken for this can vary considerably. In fixed positioning mode, the unit waits until at least one satellite is visible and tracked. In “Survey” and “Mobile” positioning modes, the unit requires to see at least 4 satellites in order to obtain position information, and therefore will take longer, dependent upon satellite visibility conditions. Once GPS engine initialization is complete, the front panel “Fault” LED will go OFF.
5.5.3. Oscillator Phase Locked Loop initialization During this phase, the front panel “Fault” LED will be OFF, and the “Lock” LED (green) will be flashing. The unit automatically enters this mode following initialization of the GPS engine, and during this mode is “locking” the internal oscillator to the GPS generated 1PPS. Dependent upon the type of oscillator fitted, the duration of this mode can vary. Fastest is the TCXO (standard) version, followed by the OCXO and Rubidium versions respectively.
5.5.4. Status Screens There are a number of status screens that are selected by pressing F2 from the time, menu or position screens. The status screens are “toggled” with the up/down keys. Which screen you are on is indicated by a number in the lower right-hand corner. #1 is the version and the number of satellites being tracked, and a position status. The position status can be: "CMPL": the positioning has completed, but the mode of operation is still "Survey". "FIXED": the positioning mode is fixed. "POS:n": where 'n' is the number of position fixes that have been completed. This is shown when the unit is currently surveying a position.
#2 is some information about the control loop. LOOP shows whether the loop is "OK" or in HOLDover. PH is the current phase measurement, in 1ns steps. CV is the control value DAC setting to the internal oscillator. This is a filtered number and is dimensionless.
#3 is the current position. This will update if the unit is currently surveying a position. Otherwise it is the 'fixed' position. F1 shows the position information and it is always the 'Fixed' position. This means that it does not update if the user is surveying a new position. This is the position that the unit will use if the user puts the unit into 'Fixed' positioning mode.
5.5.5. Normal Operating Display During normal operation, the following is displayed on the first menu: day of year and time
The user can toggle between this display and position by pressing F1 on the front panel keypad. F1 shows the current fixed position. Note that this may be different from the survey position while a position averaging is taking place. Once the averaging is complete the surveyed position is transferred to the fixed position. Pressing F2 indicates what type of positioning mode is currently in use. "FIX" is for fixed positioning mode. "CMPL" means that the position survey has completed. A number indicates that positioning surveying is currently being done and the number is the current average count. F2, Screen 3, is a real-time display of the current position average. 5.5.6. SETUP Menus The parameters are setup by scrolling through the menus. Conventions used in this manual are as follows: < key description > [ xxxxxxxxxx ] ( abcdefg )
<▲> <▼> <►> <◄>
represents a key press represents data entry description of display
Up arrow Down arrow Forward arrow Back arrow
The scrolls to the next menu and the scrolls to the previous menu. Pressing the
