User manual

Chapter 5. Configuration Menu
5-18 TDU 120e User Manual 61202156L1-1
Dial Backup Configuration
Under Dial Backup (DBU) configuration, the menu items are:
Backup Mode
In a backup condition, both ends of the circuit must detect
backup conditions before backup is activated. One DBU is set
to O
RIGINATE
and the other to A
NSWER
. Upon a network fail-
ure, only the Originate DBU initiates backup by dialing the
Answer end. Once called, the Answer DBU goes into backup
mode only if a backup condition is detected. This is ideal for
controlling where calls originate.
Choices: Disable, Originate, Answer
Backup On
Selects the conditions that cause the Nx/DBU to initiate
Backup.
NET FAIL
Backup occurs on RED ALARM, YELLOW ALARM, BLUE
ALARM and LOS.
NET/DATA FAIL
Backup occurs on the same conditions as NET FAIL plus loss
of data transitions on the data the Nx56/64 receives from the
network.
Pattern Verify
Selects whether the DBU will use its pattern generator and
receiver to authenticate backup attempts. When the local and
remote units are both Nx/DBUs, set to E
NABLE
; otherwise set
to D
ISABLE
.
Choices: Enable, Disable
Backup Delay
Selects the time allowed to elapse between the network going
into alarm or no data transmissions and the backup begin-
ning.
Choices: 1 sec, 3 sec, 10 sec, 30 sec, 1 min, 5 min,
10 min