Motorola Motorola PTP 250, Руководство пользователя, Страница: 226 / 236

Testing link end hardware Chapter 8 Troubleshooting
phn-2182_002v000
8-6
May 2011
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 Test resistance at
the PoE end of the drop cable on page 8-10 .
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 cable that connects the PoE power supply to
the LPU or ODU.
2
Check that the resistances are correct as specified in Test resistance at
the PoE end of the drop cable on page 8-10 .
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
Figure 8-3 . 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.
NOTE
This test is only valid if both the PoE power supply and the ODU are
disconnected.