AT&T MERLIN LEGEND Release 3.1 Maintenance And Troubleshooting Manual page 199

Checking System and Slot Status
Interpreting the System Status Screen
Console Display/Instructions
The System Status screen simulates LEDs for each module. The simulated
LEDs are represented as R (red), Y (yellow), and G (green).
Immediately following , , or
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:
.
Additional Information
R aaa =status (On, Off, No) of red LED
Y aaa =status (On, Off, No) of yellow LED
G aaa =status (On, Off, No) of green LED
is its status ( in the screens shown above),
Control Unit Problems
PC
4–109