Lucent Technologies MERLIN LEGEND Release 5.0 Maintenance And Troubleshooting Manual page 226

MERLIN LEGEND Communications System Release 5.0
Maintenance and Troubleshooting 555-650-140
Control Unit Problems
Checking System and Slot Status
Immediately following
which can be On, Off, or No status (an empty slot in the control unit).
Red LED
When the red LED is on, the module is not in service because it is in standby
mode, being tested, or is in an alarm condition. When a module resumes normal
operations, the red LED turns off.
Yellow LED
When the yellow LED is on, it usually means that at least one call is in progress
on that module. This is usually true for modules with trunks. When this is the
status, you must reset the board if you want to terminate any calls in progress
rather than waiting for them to terminate during a Busy-Out.
Green LED
The green LED is usually off. It may be on during power up or when an Internal
Loopback or CSU Loopback Test is running.
Sample LED Display (Slot 4)
If a call is in progress on a module that is in a working or normal state, the
System Status display for that module appears as:
Roff Yon Goff
If a slot is empty,
according to the sample screen in the last procedure.
, , or is its status (
R Y G
.
, , and appear without indicating a status. Slot 4 is empty,
R Y G
in the screens shown above),
aaa
Issue 1
June 1997
Page 4-136