User's Manual

ADCP-75-130 Issue 3C August 2006
Page 56
© 2006, ADC Telecommunications, Inc.
3. Disconnect the optical connectors at the DHU or supporting DEU and at the
corresponding DRU or remote DEU.
4. Inspect the optical connectors. Verify that each connector is clean and that no scratches
or imperfections are visible on the fiber end. Clean and polish the optical connector if
necessary.
5. Connect a laser light source to one end of the first optical fiber and an optical power
meter to the other end.
6. Verify that the power loss is within specifications (8 dB loss) for the length of the fiber
installed. If the power loss is not within specifications, repair or replace the optical fiber
and/or connector per local practice.
7. Repeat steps 5 and 6 for the second optical fiber.
8. Reconnect the optical connectors at the DHU or supporting DEU and the corresponding
DRU or remote DEU.
9. At the DHU or supporting DEU, place the PORT ON/OFF switch for the fiber that was
tested in the ON position (press I).
6.4.3 DC Power Test Procedure
The DRU is powered by 34–48 VDC power which is supplied through the RJ-45 connector.
Power to the DRU may be supplied by the DHU, DEU, or by a 120 VAC to 48 VDC power
converter (available separately as an accessory item) plugged into a properly grounded 120 VAC
outlet. Use the following procedure to test the DC power cable:
1. Disconnect the DC power cable from the DRU.
2. Connect the RJ-45 circuit access tool to the DRU as shown in Figure 28.
POWER
PORT
POWER
CONNECTOR
RJ-45 CIRCUIT
ACCESS TOOL
17284-A
Figure 28. Connect RJ-45 Circuit Access Tool