ADTRAN DSU IV ESP, User Manual

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Chapter 14. Viewing Status Information
61204011L1-1 DSU IV ESP User Manual 14-3
Dialing
The unit is dialing the selected number.
Going to DBU
The DSU IV ESP is entering dial backup mode.
Idle
Messages are not being transmitted but the service is immediately
available for use.
Incoming Call
Incoming call messages being received.
In Dial Backup
The DSU IV ESP is currently in dial backup mode.
No RX Signal
Sealing current detected but no data signal received from telco.
Also indicates ISDN line is inactive.
No Wink from CO
Switched 56 provider encountered a service problem (4-wire SW56
only).
Not Installed
No dial backup option installed in the DSU IV ESP.
OOS/OOF From Net
Out-of-service signal or out-of-frame condition exists. The call
cannot be completed because the called terminal or the called
terminal's access line is out of service or is faulty (4-wire SW56
only).
Open Loop
The physical connection to the backup line has been broken (4-wire
SW56 only).
DBU Line in RDL
Remote end initiated a test.
Test From Telco
The network provider has activated the CSU loopback (4-wire
SW56 only).