User's Guide Part 2

Test link end hardware Chapter 7 Troubleshooting
phn-0896_009v003
7-14
UNDER DEVELOPMENT
Feb 2010
To test RJ45 resistance, proceed as follows:
Procedure 7-14 Test RJ45 resistance
1
Unplug the cable that connects the PIDU Plus to the LPU or ODU from the
PIDU Plus.
2
Measure the cable resistances at the RJ45 between the pairs of pins specified
in Table 7-1. The measured resistances should be less than those quoted for
the applicable drop cable length.
3
Measure the resistance between pin 1 and the screen (ODU ground). It should
be greater than 100K ohms for all cable lengths.
4
Measure the resistance between pin 8 and the screen (ODU ground). It should
be greater than 100K ohms for all cable lengths.
5
Measure the resistance between pin 1 and pin 8.
If UltraSync GPS is not fitted, it should be greater than 100K ohms all cable
lengths.
If UltraSync GPS is fitted, it should be greater than 2K ohms all cable lengths.