Maintenance and Troubleshooting
5-3
9621-A2-GB20-30
August 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 Interface
Label
Indication
Color
What It Means
DM
Data Mode
Green
ON –
Access unit is sending or receiving
data, or is in DMI (data mode idle – an
all 1’s condition).
OFF –
Access unit in CMI (control mode idle –
an all 0’s condition).
OOS
Out of Service
Red
ON –
Network is not in service.
OFF –
Network is in service.
OOF/ NS
Out of Frame/
No Signal
Red
ON –
No signal is being received from the
network, the cable is not connected to
the network, or the TX and RX pairs
are cross-connected.
OFF –
A signal is present, and no out of
frame conditions have been detected
during the sampling interval.
Blinking ON and OFF ( Rate: 1 Hz ) –
At least one OOF has been detected
during the sampling interval.