User's Manual

ADCP-75-187 • Preliminary Issue 1B • November 2005 • Section 4: MAINTENANCE

Page 4-14

Figure 4-4. Host Unit Loopback Test

8. Observe the FWD/REV (PORT 1/PORT 2) LED indicator which will turn either red or

green. If the LED turns red, either the FWD (PORT 1) optical transmitter or the REV

(PORT 2) receiver is faulty. If the LED turns green, both the FWD (PORT 1) and the REV

(PORT 2) optical ports are good.

9. Place the On/Off switch in the OFF position (press O).

10. Remove the dust caps from the optical fiber connectors.

11. Clean each connector (follow connector supplier’s recommendations) and then insert each

connector into the appropriate optical port.

12. When ready to put the HU back into service, place the On/Off switch in the ON position

(press I).

13. Notify the NOC or alarm monitoring service that the system is going back online.

5 SCHEDULED MAINTENANCE REQUIREMENTS

The only scheduled maintenance required for the SCS system is to remove and replace the HU

cooling fans. This should be done at 60 month intervals. Refer to the applicable Digivance

LRCS Host Unit Installation and Maintenance Manual (See Related Publications section) for

the procedure.

HOST UNIT

1 METER PATCH CORD

15 dB

ATTENUATOR

20019-C

FWD

(PORT 1)

REV

(PORT 2)