Port Led Is Off; Port Led Is Flashing - Motorola PTP 250 User Manual

Testing link end hardware

PORT LED is off

When the PoE power supply is connected to the power supply and the AC LED illuminates,
there should be a 45 second delay, following which the PORT LED should illuminate (green
steady).
If the PORT LED is off, proceed as follows:
1
Check that the RJ45 connection from the DATA IN port of the PoE power supply
to the PC is working.
2
If the PC connection is working, remove and examine the cable that connects
the PoE power supply to the LPU or ODU.
3
Check that the resistances are correct as specified in
cable
4
If this test fails, replace or repair the cable that connects the PoE power supply
to the LPU or ODU.

PORT LED is flashing

If the PORT LED is flashing, proceed as follows:
1
Remove and examine the ODU cable from the PoE power supply.
2
Check that the resistances are correct as specified in
cable
3
Use the LPU (if installed) to check that power is available on the cable to the
ODU. Access the connections by rotating the LPU lid as shown in
Slacken the lid nut but do not remove it.
4
Test that test point P1 on the LPU PCB corresponds to pin 1 on the RJ45. Repeat
for points P2 to P8.
This test is only valid if both the PoE power supply and the ODU are
disconnected.
5
Check that the PWR LED near the top right of the LPU PCB is illuminated to
indicate power in the Ethernet cable
6
If any test fails, replace or repair the cable that connects the PoE power supply
to the LPU or ODU.
8-6
on page 8-10.
on page 8-10.
UNDER DEVELOPMENT
Test resistance in the ODU
Test resistance in the ODU
(Figure 8-3).
phn-2182_003v004 (Oct 2011)
Chapter 8: Troubleshooting
Figure 8-3.