Transcript
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INTRODUCTION
This document provides installers and technicians with industry accepted connector cleaning guidelines, fiber optic connector end face inspection procedures, and fiber optic loss measurement techniques. Adhering to the following procedures will ensure a reliable and properly documented fiber optic installation. All ODM measurement equipment conforms to NIST traceable standards. All connector cleaning guidelines conform to IEC 61300-3-35 Ed.1.0. This document is issued as a general reference guideline to support wireless contractors to effectively test, inspect and document the dB loss and visual inspection of the T-Mobile main tower and sector fiber optic cables.
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Table of Contents
Page
Introduction
2
Section 1
T-Mobile installation site and components general overview
5
Section 1.1
Test Site overview
5
Section 1.2
Optical Interface Connectors
6
Section 1.3
General Handling of Optical Fiber
6
Section 1.4
Optical Cable Installation
7
Section 1.5
Tools & Test Equipment Required
8
Section 1.6
Training & Certification
8
Section 1.7
Inspection & Cleaning
8
Section 2 – Fiber Optic End Face Inspection and Cleaning Procedures
8
Section 2.1
Grading Template
9
Section 2.2
First Inspection
11
Section 2.3
End Face Acceptability
13
Section 2.4
First Dry Cleaning
13
Section 2.5
One Click Dry Cleaning
13
Section 2.6
Second Inspection
14
Section 2.7
End Face Acceptability
14
Section 2.8
Second Dry Cleaning
15
Section 2.12 Third Inspection
15
Section 2.14 First Wet/Dry Cleaning
15
Section 3 –
Test Equipment TTK 500 & AC063 ODC2 accessory kit Bill of Materials
18
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Inspection & dB Loss Test Procedure for T-Mobile Main and sector cables
Section 4.1
Pre Installation
21
Section 4.2
Post Installation
21
Section 4.3
Visual Inspection of end face connectors
21
Section 4.4
Sector Jumper Pretest
21
Section 4.5
System Test
26
Section 5 – Closeout Documentation
28
Section 6 – Technical Support and FAQ
30
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Section 1 T-Mobile installation site and components general overview 1.1
Test site overview Test site connection overview shown in figure 1.
ODC 2 to LC Optical Jumper
Hybrid Tower Cable
Figure 1
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1.2
Optical Interface Connectors The optical interface connectors used in the T-Mobile installation are LC, ODC 2 plug and socket connectors. These are shown from left to right in Figure 2 (LC in duplex configuration, ODC Plug, ODC Socket).
Figure 2 1.3
General Handling of Optical Fiber When handling optical cables, consider the following: 1. Optical cables are sensitive to mechanical stress, sharp bends, kinks, dust, and dirt.
They are not, however, sensitive to electrical interference 2. Make sure not to apply excessive force to the cable 3. Never over-bend the cable.
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1.4
Optical Cable Installation Please refer to the T-Mobile EIG for complete optical cable installation practices.
1.5
Tools & Test Equipment Required The following items are suggested to properly test and inspect cables and connections between the RRU and tower base. RP460 Optical Power Meter DLS355 Stabilized laser source Optical jumper cables for connection from light source or power meter to: o ODC Main Trunk cable o ODC Sector Cable o LC Male Main and Sector Cables VIS300 (Video Inspection Scope) monitor and probe VIS300 probe adaptors: o ODC socket adapter o ODC plug adapter o ODC plug alignment adapter o 1.25mm universal for LC male o LC bulkhead adapter Torque wrench for ODC 2 connector Optical endface cleaning products providing cleaning of 1.25mm, 2.5mm ferrules, ODC 2 plug and socket connectors: o 1.25 mm swabs o One click dry cleaning stick o SQR cleaning pad o Approved cleaning solvent
Test Equipment Requirements and Documentation
RP460 Optical Power measurement accuracy +/- 0.25 dB RP460 and DLS355 calibration certificate Image manager software
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1.6
Training & Certification Technicians tasked with installing, cleaning and inspecting fiber optic sites are suggested to be certified by the inspection and test equipment manufacturer in the proper use of the inspection and test equipment.
1.7
Inspection & Cleaning
It is suggested that all optical connectors including the connectors to be tested and test equipment connectors meet the standards set forth in this document. This provides reliable optical connections and prevents damage or contamination of the connectors.
Technician inspection and cleaning certification shall be made available upon request or provided with close out documentation.
Section 2 – Fiber Optic End Face Inspection and Cleaning Procedures Introduction The purpose of this section is to outline fiber optic connector inspection techniques and industry standard cleaning procedures to ensure proper connector endface quality prior to testing installed systems. WARNING: When working with fiber optic cables always assume the fiber is live. Invisible laser radiation can cause irreversible injury to the human eye. Never look into the end of an exposed fiber optic cable, bulkhead, or optical light source. The use of nondirect viewing devices such as the VIS 300 Video Inspection Scope is highly recommended. As per document IEC - 61300-3-35 Ed 1.0 the following inspection and cleaning procedure should be used before installing or testing any fiber optic jumper or trunk cable. Only use approved test sets, inspection equipment, and cleaning supplies. Any moveable debris on a fiber optic connector end face is not allowed. After 3 dry cleaning attempts to remove debris a “wet/dry” cleaning process is suggested. 2.1
Use the following ODM grading overlay template (shown in Figure 4) in conjunction with the Zone grading criteria table (shown in Figure 5) to determine acceptability of the fiber end face.
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Figure 4 2um, 5um, and 10um diameter obstructions are provided in the outer most area of the zone grading overlay. The circle defining the limit of the contact zone has a 3um line width. Zones are accurately determined by placing the grading template on top of the VIS300 display and aligning the cladding zone with the cladding on the display. If obstructions and/or scratches are visible in the critical, cladding, adhesive, or contact zone you can place each sized reference obstruction over the obstruction in question to determine acceptability according to the table below. The 3um contact zone limit circle line width can be placed on top of any scratches to determine scratch width acceptance according to the table below in figure 5.
Single-Mode Criteria Table Zone Description
Diameter
Allowable Defects (Diameter) None visible at 200X
Allowable Scratches (Width) None visible at 200x
A
Critical Zone
25um
B
Cladding Zone
25 to 120um
Any less than 2um 5 from 2 - 5um None > 10um
None greater than 3um
C
Adhesive Zone
120 to 130um
None > 10um
Any scratch OK
D
Contact Zone
130 to 250um
None > 10um
Any Scratch OK
Figure 5 ODM PRC-0xxx, SEP-12, Rev E
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Figure 6 shows alignment of the Grading template to the cladding area to determine if obstruction and/or scratches are present in the relevant zones.
Figure 6
Figure 7 Comparing 2um zone template obstruction with obstruction in cladding zone.
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Figure 8 Comparing 3um line width contact zone line width with scratch across contact and cladding zon
First Inspection 2.2
Inspect the fiber optic cable end face using the VIS300 with probe and LC adapter tip. In Figure 9 an LC fiber optic end face is being inspected. Please note that T-Mobile uses a hybrid cable system. This trunk and optical jumper cable system incorporates the use of the ODC 2 fiber optic connector shown in Figure 10, 11 and 12. Figure 11 and 12 also show the VIS300 ODC adapters and the VIS 300 inspection probe inserted into the ODC socket and plug assemblies.
Figure 9 ODM PRC-0xxx, SEP-12, Rev E
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Figure 10 shows the ODC 2 plug on left and ODC 2 Socket on right.
Figure 10
Figure 11
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Figure 12 2.3
If the end face is clean of debris, scratches, and no defects are seen using 200x magnification then the connector is considered acceptable for connection.
First Dry Cleaning 2.4
If the end face shows debris, scratches, or defects according to Section 2.1 perform the first dry clean procedure. Use the ACO94 LC Connector Cleaner for cleaning LC connectors shown in figure 13A. One push/click is generally acceptable. Push LC Cleaner into LC connector
A
B
Figure 13 2.5
If cleaning an LC bulkhead adapter is required refer to Figure 13B with AC 094 LC Connector Cleaner. Remove small clear plastic cap for bulkhead push and click cleaning.
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Figure 14 Figure 14 shows ODC plug and socket one click cleaning. Second Inspection 2.6
Perform second end face inspection with VIS300-USB Video Inspection Scope. Refer to figure 9 and 12.
2.7
If the end face is clean of debris, scratches, and no defects are seen using 200x magnification then the connector is considered acceptable for connection.
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P a g e | 15 Second Dry Cleaning or Grading the Fiber End Face 2.8
If the end face shows the debris has moved perform the second dry clean method. Refer to figure 13.
2.9
If all debris was unchanged or unmoved the end face must be graded. Refer to “Grading the Fiber End Face” in Section 2.1.
2.10
If grading determines the end face is acceptable then make your connection.
2.11
If grading determines the end face is unacceptable according to section 2.1, perform second dry cleaning. Refer to figure 13.
Third Inspection 2.12
Perform third end face inspection with VIS300-USB Video Inspection Scope. Refer to figure 9 and 12.
2.13
If the end face is clean of debris, scratches, and no defects are seen using 200x magnification then the connector is considered acceptable for connection.
First Wet/Dry Cleaning of Endface Connectors 2.14
The SQR pad supplied is designed to be used in conjunction with the MX Fiber Wash Pen.
2.15
Place the sheet protector with the arrows, under the first sheet of cleaning material. Refer to Figure 15A
A
B Figure 15
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Each sheet is designed for four connector cleanings. Do not clean over already used sheets of cleaning material
2.17
Take the MX Electro-Wash Pen and apply a coin size spot of solvent by pressing the pen tip to the exposed wipe near the top of the sheet separator. Be careful not to apply too much solvent. Refer to Figure 15B.
2.18
Hold the end of the connector at a 90˚ angle and gently press the connector into the wet spot on the wipe. Refer to Figure 16A. Gently drag the connector from the wet spot across the remaining dry portion of the wipe ending at the bottom of the wipe shown in Figure 16B.
A
B Figure 16
Cleaning Bulkhead Connectors and Multi-pin Connectors Using 1.25mm and 2.5mm Cleaning Swabs 2.19
Take the MX Electro-Wash Pen and apply a coin size spot of solvent by pressing the pen tip to the exposed wipe near the top of the sheet separator. Be careful not to apply too much solvent. Refer to Figure 15B.
2.20
Gently moisten the tip of the cleaning swab to the wet surface. Refer to Figure 17A.
2.21
Gently clean each of the connector end face of the ODC socket with the wet 2.5mm cleaning swab. Refer to Figure 17B.
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A
B Figure 17
Figure 18 2.22
Cleaning of the ODC plug end requires following section 2.19 using a 1.25mm cleaning swab/stick. Refer to Figure 18.
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Section 3 - Test Equipment for Connector Inspection & dB Loss Testing - TTK 500 Kit The TTK 500 Bill Of Materials details the suggested equipment to perform the following tasks of the T-Mobile installation. Sector cable and overall system dB loss test Portable video inspection of all connectors including the ODC 2 Plug and Socket connectors Connector cleaning kit for the complete endface cleaning of all connector interfaces including the LC Duplex connector and ODC 2 connector. USB software for closeout documentation.
TTK 500
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MODEL DLS 350M DLS 355M RP460-02
DESCRIPTION Dual LED Source 850nm/1300nm with SC Connector output Dual Laser Source 1310nm/1550nm SC Conn. Power Meter w/ Zero dB/Set Ref, 1000 data point store & USB download
AC 029 AC 300
Video Inspection Scope - Includes 3 1/2" monitor w/USB and Image Manager Software, Probe, Hard Carry Case, AC Adapter/Charger, 2.5mm Universal Connector Adapter, SC Bulkhead Adapter, LC bulkhead adapter and 1.25 universal adapter LC Adapter for RP460 Optical Power Meter CR2 Battery Kit / 5 per pack
AC 500
LC-SC, SM, 9/125 Fiber, 1 Meter Cable
AC 502
LC-LC, SM, 9/125 Fiber, 2 Foot Cable
AC550
LC-SC, MM 50/125 fiber
AC552
LC-LC, MM 50/125 fiber
AC 600
SC-SC Adapter
AC 601
LC-LC Adapter
CK 125
Cleaning Kit - Includes fiber cleaning solution, wipes, 1.25mm swabs, 2.5mm swabs good for 300 connectors and adapters
AC 094
One Click Connector Cleaner
AC 012
ODM 17" Hard Carry Case
VIS 300USB
APPLICATION
QTY EA
Multimode fiber light source used w/RP 460 power meter for dB loss test Singlemode fiber light source used w/RP 460 power meter for dB loss test Power meter used with light source for dB loss measurement and storage, also offers USB transfer to computer for closeout documentation Portable connector inspection device to view connector endface and ensure connectors meet IEC 825 standard after proper cleaning procedures. Allows LC connection to optical power meter Spare Battery Kit Fiber patch cord to allow calibration of test instruments for complete system dB loss test Fiber patch cord to allow calibration of test instruments for complete system dB loss test Fiber patch cord to allow calibration of test instruments for complete system dB loss test Fiber patch cord to allow calibration of test instruments for complete system dB loss test SC adapter to allow legacy(Clearwire) DLS 355 to test dB loss LC adapter to allow access to LC duplex connector on Optical Jumper Cable Complete Wet/Dry cleaning system for all connector endfaces including ODC 3 connectors and System/RF modules (300+ cleanings) Used for LC connector ends and bulkheads adapter for quick “dry” clean only Protective carry case for all instruments and accessories except for AC 060
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1
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AC063 – Bill of Materials MODEL
DESCRIPTION
APPLICATION
AC014 AC 062
Soft padded pouch Ruggedized test cables for EricssonODC2/LC SM hybrid and sector cables
Store Test Cables and equipment ODC2 reference cables to allow testing of optical ODC2 plug and ODC2 socket style cables..
AC100 AC101 AC105 AC200
ODC plug adapter for probe ODC socket adapter for probe ODC plug guide for probe plug adapter ODC torque wrench for H & S cables
AC523 AC4500
LC-Clipped to LC & SC cable Loopback 0dB, LC Duplex
Allows inspection of ODC plug optical endface Allows inspection of ODC socket optical endface Provides improved alignment when using AC0100 Provides proper torque of mating nut on H & S ODC interconnections Calibration and dB test cable Calibration and db test module with lanyard
QTYEA 1 1 1 1 1 1 1 1
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Section 4 Inspection & dB Loss Test Procedure for T-Mobile Main and Sector cable
Note:
4.1
All cables to be tested using Loopback loss method. Keep all calibration cables and adapters clean and contamination free. Calibration cables and adapters should be replaced yearly
Please consult with your Construction Manager for close out documentation requirements. Pre-Installation Prior to installation, the main and sector cables should be inspected, cleaned and endface images saved using the Image Manager Software.
4.2
Post-Installation Once the cables have been installed they should be inspected, cleaned (if necessary) and tested. Post-installation test procedure:
Remove fiber optic cable connector end face dust cap. Perform Inspection and Cleaning Section 4.3 Perform Loopback System Loss Test Section 4.4 Mate optical connectors
Note: Contact Site Manager for close out documentation requirements. 4.3
Visual inspection of end face connectors using the VIS 300 Video Inspection Scope 4.3.1 Please refer to figure 19 for LC, figure 20 for ODC socket, and figure 21 for ODC plug using plug centering adapter with ODC plug connector end face inspection examples. Connector end face debris or contamination must pass the criteria as set forth in IEC 61300-3-35 Ed 1.0. Please see Section 2 for grading and PASS/FAIL criteria.
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Figure 19
Figure 20
Figure 21 ALL PATCH CORDS, SYSTEM CABLES AND OPTICAL PORTS MUST BE INSPECTED PRIOR TO TEST OR INSTALLATION OF SYSTEM OPTICAL COMPONENTS. 4.3.2
In addition to all connector end face inspections, all Optical Jumper Cable LC Duplex, ODC plug and socket connector ends will be saved as .jpg images on the laptop computer and provided in closeout documentation. Please see IMS User Guide Instructions for the VIS 300 – USB for storage instructions. Please see Figure 22 for saved end face image examples
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sTT-
Mobile
Figure 22
4.4
Optical Sector Jumper Pretest
Introduction This dB loss test will use the Loopback method test for all of the sector jumpers. . 4.4.1
To calibrate for total system loss measurement, please refer to Figure 23.
4.4.2
Power on both the RP 460 optical power meter and the DLS 355 light source. Place both instruments in the 1310nm position. Set the RP 460 in the dBm position. Attach patch cords as shown in Figure 23. Note typical readings of -3.00 dBm to -4.00 dBm. (The RP 460 memory should be cleared each day prior to measurements)
4.4.3
Press the dB/dBm button and hold for four seconds or until the second beep is heard. The RP 460 will now display 0.00dB.
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Figure 23
4.4.4
The RP 460 is now calibrated. Remove the loopback module and LC duplex connector leaving both instruments powered and connected to the yellow patch cords.
4.4.5
Connect the LC duplex ends of the yellow jumper cables to the LC duplex ends of the ODM ODC plug style reference cable using an LC duplex bulkhead adapter.
4.4.6
Connect the sector jumper cable to the ODM ODC plug cable and secure using the supplied Torque wrench which is set to 1N/M.
4.4.7
Connect the loopback module with LC duplex bulkhead adapter to the LC duplex end of the sector jumper. Test setup shown in Figure 24
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Figure 24 4.4.8
The RP460 is now displaying the loss of the sector cable.
Sector cable loss measurements should be below 2.6 dB. 4.4.9
Press the SAVE button on the RP460 to save the measurement.
Be sure to test the sector cables in a predetermined order to allow the technician to properly label the loss files later when dowloading and reporting using the ODM Data Manager Software. 4.4.10 Repeat steps 4.4.6 through 4.4.9 until all sector jumper losses have been saved to the RP460.
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Calibration & dB Loss Measurement of System (Sector cable connected to Main Tower Cable)
Introduction This dB loss test will use the Loopback method test with the sector jumper and Main tower cable connected as a system. 4.5.1
Power on both the RP 460 optical power meter and the DLS 355 light source. Place both instruments in the 1310nm position. Set the RP 460 in the dBm position. Attach patch cords as shown in Figure 23. Note typical readings of -3.00 dBm to -4.00 dBm. Refer to figure 25 for calibration setup.
Figure 25 4.5.2
To calibrate the RP 460 press and hold the dB / dBm button for approximately four seconds and after hearing the audible tone twice. The RP 460 will now read 0.00dB.
4.5.3
Remove the loopback module and LC duplex bulkhead adapter and send to the tower top and connect to the appropriate sector cable at the RRU LC duplex end.
4.5.4
Connect the LC duplex end of the yellow calibration cables to the appropriate LC duplex pair at the base end of the Main Tower Cable. Figure 26 shows the RRU connection on the top left and base Main connection on right.
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Figure 26 4.5.5
The RP460 is now displaying the loss of the system.
System loss measurements should be below 4 dB. 4.5.6
Press the SAVE button on the RP460 to save the measurement.
Be sure to test the system cables in a predetermined order to allow the technician to properly label the loss files later when dowloading and reporting using the ODM Data Manager Software. 4.5.7
Repeat steps 4.5.3 through 4.5.6 until all system losses have been saved to the RP460. See figure 27 for example of the Data Manager Software window.
Note: Spare or unused Main Tower Cable pairs may also require testing. If spares are required to be tested, use one of the supplied sector jumpers to test the spare pairs. Contact your site manager for requirements.
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Figure 27 Section 5 Closeout Documentation
Note:
Please consult with your Construction Manager for close out documentation requirements. 1. Connector images of the LC Duplex (Tower top sector jumper and Main Tower bottom), ODC Plug, and ODC Socket connectors of all Optical Sector and Main Tower cables. These jpg images can be copied from the folder that they were saved in using the Image manager software. 2. Using the Data Manager software all dB loss readings can be saved to a PDF, Word or Excel document file. Please read the Data Manager Software manual for downloading and reporting. 3. Contractors should provide proof of inspection and testing certification of the technician and certificate of calibration for the test equipment. 4.
As part of the Contractor’s Close Out documentation for optical inspection and test the contractor should provide photographs of the following:
Sector Jumpers and Main connector endfaces Sector jumper and System dB loss readings. See figure 28.
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Figure 28 ODM PRC-0xxx, SEP-12, Rev E
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Section 6 Technical Support and FAQ 6.1
For technical support on any of the procedures, guidelines contained within this guide or if you have general questions regarding the fiber portion of this project please call 603524-8350. After normal business hours please email to
[email protected].
6.2
Frequently Asked Questions What is the difference between dBm and dB? o dBm is an absolute optical power measurement referenced to one milliwatt of optical energy. It is the starting measurement of the dB loss measurements.
Why do I get a negative dB reading? o This reading is often the result of the calibration cables not being as clean and aligned as the cable under measurement. This “negative reading is common while measuring very short distance cables (less than 100 feet). Always keep reference patch cables clean and free from contamination. Negative readings greater than -.5dB are indicative of other problems in the measurement. In this case give our tech support group a call at 603524-8350
Will my reading be saved in the RP 460 memory while the battery is changed? o Yes the RP 460 will retain measurements in a non-volatile memory
Why do I need to inspect all fiber connections o Short distance fiber systems that fail are typically the result of dirty or contaminated connector ends. Over 90 % of all failures are attributed to endface debris. The use of a Video Inspection Scope ensures a quality connected fiber system.
Optical Design Manufacturing Inc.- 143 Lake Street - Laconia, NH USA 03246 Phone - 603-524-8350 – Fax - 603-524-8332 Web: www.odm-inc.com Email:
[email protected]
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