ADTRAN DSU IV ESP, User Manual

Page: 86 / 194

Chapter 9. Configuring Dial Options
9-6 DSU IV ESP User Manual 61204011L1-1
Standard DBU Options
Automatic DBU
The
A
UTOMATIC
DBU
option specifies whether the unit
automatically enters dial backup mode or waits for manual setup.
The factory default setting is
D
ISABLED
.
Number to Dial
The N
UMBER TO
D
IAL
option offers a selection of stored numbers for
the unit to automatically dial. If the leased line fails, and the DSU
IV ESP is set to originate, it dials the numbers (in chronological
order) specified under this option to set up the dial backup line.
The factory default setting is
D
IAL
W
ITH
#1 .
Originate/Answer
The O
RIGINATE
/A
NSWER
option specifies whether the DSU IV ESP
originates or waits to answer if the dedicated circuit fails. One end
must be set to
O
RIGINATE
and the other to A
NSWER
. The factory
default setting is A
NSWER
.
DBU Criteria for Entering Dial Backup Mode
These options specify the conditions that will cause the DSU IV ESP
to enter the backup mode.
When Out of Service (OOS)
When enabled, the DSU IV ESP enters backup mode if an out-of-
service condition is detected. The factory default setting is
E
NABLE
.
No Receive (RX) Signal
When enabled, the DSU IV ESP enters backup mode when a loss of
signal is detected. The factory default setting is
E
NABLE
.
No Sealing Current
When enabled, the DSU IV ESP enters backup mode when a loss of
sealing current is detected. The factory default setting is
E
NABLE
.
When all 1s/0s
When this option is enabled, the DSU IV ESP monitors the receive
data for strings of 1s or 0s that are longer than the Fail Timer. If this