Cabletron Systems CSMIM-T1 Installation Manual page 71

The information displayed at the beginning of every stats -T command is
described in Table 4-3.
Field
Sync
Loss of Signal
Blue Alarm
Red Alarm
Yellow Alarm
Loopback
CSMIM-T1 Hardware Installation Guide
Table 4-3 stats-T Command Information
When Sync is true, the T-1 engine is detecting frame
synchronization. When Sync is false, the T-1 engine has lost
frame synchronization and enters the red alarm state.
When Loss of Signal is true, the T-1 engine is not detecting
pulses on the T-1 network interface receiver. When Loss of
Signal is false, the T-1 network interface is receiving pulses.
The loss of signal condition causes the T-1 engine to transmit
AIS (all ones unframed) on the T-1 network interface.
When the Blue Alarm is true, the T-1 engine is receiving AIS
(all ones unframed) from the network. When the Blue Alarm is
false, the T-1 engine is not receiving AIS. The Blue Alarm
event saved in the history buffer is also displayed.
When the Red Alarm is true, the T-1 engine has detected loss
of frame synchronization. During this condition, the T-1
interface is sending a Yellow Alarm to the network. When the
Red Alarm is false, The T-1 engine is in frame synchronization
and the sync indication is true. The Red Alarm event saved in
the history buffer is also displayed.
When the Yellow Alarm is true, the T-1 engine is receiving a
Yellow Alarm from the network. When the Yellow Alarm is
false, the T-1 engine is not receiving a Yellow Alarm from the
network. The Yellow Alarm event saved in the history buffer is
also displayed.
The loopback status has the following possible states:
None - There is no loopback in progress. The test LED on the
front panel is not illuminated.
Local - The T-1 network interface is in local loopback. The test
LED on the front panel is illuminated.
Line - The T-1 network interface is in line loopback. The test
LED on the front panel is illuminated.
Payload - This means that the T-1 network interface is in
payload loopback. The test LED on the front panel is
illuminated.
Description
T-1 Commands
4-3