Irregular Ethernet Activity; Connection Is Not 1000 Baset; Test Rj45 Resistance - Motorola PTP 600 Series User Manual

11.1.5 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 9 "Recovery Mode".

11.1.6 Connection is not 1000 BaseT

If the Ethernet connection to the network is only 10/100 BaseT, when 1000 BaseT is
expected, perform the following tests on the RJ45 cable that connects the PIDU to the LPU or
ODU:
1. Check that the wiring to pins 4&5 and 7&8 is correct. For example, the wiring to pins
4 and 7 may be crossed.
2. If this test fails, replace or repair the RJ45 cable.

11.1.7 Test RJ45 Resistance

If the above procedures fail to diagnose the issue, there may be a fault in the wiring of the
RJ45 cable that connects the ODU (or LPU) to the PIDU. Unplug this cable from the PIDU,
then perform the following test procedure:
1. Check the cable resistance between pins 1&2, 3&6, 4&5 and 7&8 at the RJ45. Check
against column 2 in Table 38. Resistances for each pair should be within 1 ohm of each
other.
2. Check the cable resistance between pins 1&3 and 4&7 at the RJ45. Check against
columns 3 and 4 respectively in Table 38.
3. Ensure that there is greater than 100K ohms between pins 1&8 for all cable lengths.
4. Ensure that there is greater than 100K ohms between pin 1 and ODU ground for all cable
lengths.
5. If GPS is not fitted, ensure that there is greater than 100K ohms between pin 8 and ODU
ground for all cable lengths. If GPS is fitted, ensure there is greater than 3K ohms
between pin 8 and ODU ground.
11 Troubleshooting (Fault Finding)
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