User's Manual

862-01545 µLink System Manual
Issue 1 Page 41
Table 6. IU Front Panel: Controls, Indicators and Connectors
Item Description
Near Alarm LEDs
Used to indicate Failure, Service and Site alarms
or status. The LEDs are tri-colour to indicate No
Alarm (Green), Existing Alarm (Red) and
Historic Alarm (Amber) conditions. Refer to
Chapter 5, Maintenance Information for more
details about these alarms.
Far Alarm LEDs As for Near Alarm LEDs.
Status LEDs The following status LEDs are located on the IU
Front Panel:
a. Power ON
b. Tx Sync
c. Rx Sync
d. Loss of Signal (LOS)
e. Alarm Indication Signal (AIS)
The Power-ON LED is red. If LED is ON, it
indicates Power-ON if OFF, it indicates Power Off.
LEDs b to e are tri-coloured to indicate No Fault
(Green), Existing Fault (Red) and Historic Fault
(Amber) conditions. Refer to Table 7 for more
information about the Status LEDs.
Monitor Connector RS-232 standard 9-pin D-type connector for
operation at a nominal 19200 baud. For use with
the Craft Terminal.