Specifications

58
CSU/DSU MS DBU
Fail Timer
This option sets the amount of time the dedicated circuit failure condition must be
active before the CSU/DSU MS DBU attempts backup. The amount of time, which
is manually entered, can be as long as 990 seconds and as short as 100 ms if the 0
(zero) option is selected. The factory-default setting is 30 seconds.
AUTO DBU FAIL
TIME: __ __ x 10sec
Wait to Redial
This option works in conjunction with the preceding Redial Counter. It selects the
amount of time between redial attempts to connect the backup line. The amount
of time, which is manually entered, can be up to 99 seconds. The factory-default
setting is 10 seconds.
WAIT TO REDIAL
TIME: __ __ SEC
Transition Timer Dial Backup Option
This option sets the amount of time the DSU keeps the DBU connection up after
the auto-restore function transitions back to the dedicated circuit. The factory-
default setting is 60 seconds. A value of 0 seconds causes the DSU to drop the
DBU call immediately after transition to the dedicated line.
Table 9-2. DBU Options AT Commands for All Models
Front Panel AT Command Description
Automatic DBU
1=DISABLED _K0 Automatic DBU disabled
2=ENABLED _K1 Automatic DBU enabled
Number to Dial
1=DBU WITH #1 _B0 Dial stored #1
2=DBU WITH #2 _B1 Dial stored #2
Originate/Answer
1=DBU ORIGINATE _E0 Originates call if DDS fails
2=DBU ANSWER _E1 Answers call if DDS fails
DBU Criteria
WHEN OUT OF SERVICE
1=Disabled _G0 No DBU for OOS
2=Enabled _G1 DBU when OOS
NO RECEIVE (RX) SIGNAL