MobileAccess™ 1000/1200
Appendices
UM-1000, Revision 2.2
31
To isolate cable:
1. Find place near test point where winding the cable into a pigtail is possible.
1. Make pigtail.
2. If cable is shorter than 100 meter, then verify that cable is disconnected at end.
3. Measure the return light power (P2), connector #2.
Calculating Return Loss
Calculate the difference between the signals in dB.
(Return loss)dB = (P2)dBm – (P3)dBm + (Lc)dB
4.1.8 Results
The following table is to be filled in by technical personnel testing the fiber optic
cables.
Table 4-1: Fiber optic Cable Test Results
Test Measurement
Pass
Range
Pass/Fail
Optical insertion loss
<0.5 dB/Km
Optical return loss
< -50 dB
4.1.9 Summary
If the fiber fails in the optical insertion loss or optical return loss tests, then the
connector needs to be cleaned. Connector cleaning is carried out according to a
standard cleaning procedure. Following cleaning, the fiber needs to be tested again.
If the failure continues in the fiber following cleaning, then the technical personnel
need to refer to the fiber optic cable manufacturer’s troubleshooting guide.If the fiber
passes the optical insertion loss and optical return loss tests, then the tested fiber
optic cable is considered suitable for use with MobileAccess equipment
Summary of Contents for 1000 System
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