ADTRAN TSU 120e - Manual (Page 42)

Chapter 3. Operation
3-4 TSU 120 User Manual 61202129L1-1
DSU/DSX Status
The DSU/DSX status LEDs display the operational condition
of the Nx56/64 and DSX-1 parts included in the TSU 120. It
also reflects the status of the DBU in the TSU 120e.
Module Status
The module status LEDs display the operational condition of
ports installed in the option slots.
OK ( GREEN ) Indicates the operation is in the normal mode
and no errors have been detected.
T EST
( YELLOW )
Indicates that one of the interfaces is operating
in a test mode. This includes a self-test or a test
loopback. When lighted, this LED also indicates
that normal data flow is not occurring in at least
one of the module ports.
A LARM ( RED ) Indicates an alarm condition has been detected.
When the alarm condition is no longer valid, the
OK LED activates (turns on). To view an alarm
condition, select the active alarm menu item or
select Alarm by pressing
Shift+8 . If the alarm
conditions have been corrected, the alarm
which caused the activation of the Alarm LED
can be viewed under the Unit History Menu.
OK ( GREEN ) Indicates the operation is in the normal mode
and no errors have been detected.
T EST
( YELLOW )
Indicates that one of the interfaces is operating
in a test mode. This includes a self-test or a test
loopback. When lighted, this
LED also indicates
that normal data flow is not occurring in at least
one of the module ports.