
Maintenance and Troubleshooting
5-3
9121-A2-GB20-00
June 1997
Label
What It Means
Color
Indication
TST
Test Mode
Yellow
ON –
Loopback or test pattern in progress,
initiated locally, remotely, or from the
network.
OFF –
No tests are active.
BKP
Backup
Yellow
ON –
Access unit is in Backup mode;
that is, the backup link has been
established, and backup is in progress
through the specified Alternate
Destination Link.
OFF –
Access unit is not in Backup mode;
that is, unit is idle, or is originating or
answering a backup call.
Blinking ON and OFF ( Rate: 1 Hz ) –
Alternate Destination Link is being
established, but no data has been
passed.
Network/DSX Interface
Label
Indication
Color
What It Means
SIG
Signal
Green
ON
– A recoverable signal is present on the
Network/DSX interface.
OFF – The signal cannot be recovered from
the Network/DSX interface. An LOS
condition exists.
OOF
Out of Frame
Yellow
ON
– At least one OOF was detected during
the sampling period.
OFF – No OOFs were detected during the
sampling period.
ALM
Alarm
Yellow
ON
– An alarm condition is present on the
network/DSX interface.
Current alarm conditions:
Loss of Signal ( LOS )
Out of Frame (OOF)
Excessive Error Rate (EER)
Yellow
Alarm Indication Signal (AIS)
OFF – No alarm condition is present on the
Network/DSX interface.