No Ethernet Activity; Irregular Ethernet Activity; Figure 106 - Ptp Lpu Test Points - Motorola PTP 500 Series User Manual

If either test fails, replace or repair the RJ45 cable.

9.1.4 No Ethernet Activity

If the Ethernet LED did flash 10 times but then went off, check that the RJ45 connection from
the LAN port of the PIDU Plus to the PC is working. If the PC connection is working, perform
the following test on the RJ45 cable that connects the PIDU Plus to the LPU or ODU:
1. Check that the wiring to pins 1&2 and 4&6 is correct. For example, the wiring
2. If this test fails, replace or repair the RJ45 cable.

9.1.5 Irregular Ethernet Activity

The yellow Ethernet LED should blink randomly as normal traffic passes through. If the
Ethernet LED flashes irregularly, for example there is a short flash followed by a long flash,
this indicates that the ODU has booted in recovery mode. The causes may be installation
wiring or a corrupt ODU software load. For more information, see Section 8 "Recovery Mode".

Figure 106 - PTP LPU Test Points

to pins 1 and 3 may be crossed.
9 Troubleshooting (Fault Finding)
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