Answer Always; Operation During Noncritical Times; Weekend And Time Of Day Lockout - ADTRAN DSU IV ESP User Manual

Chapter 4. Applications

Answer Always

When this option is enabled, the unit goes into DBU mode if a call
is present regardless of the status of the dedicated circuit. It is
recommended that the DBU Passcode be used in this mode since
inadvertent calls could stop data flow indefinitely.

Operation During Noncritical Times

The DSU IV ESP may be configured not to enter dial backup mode
if data terminal ready (DTR) is low. This feature prevents the DSU
IV ESP from entering dial backup during noncritical times such as
nights and weekends.
For more information, see Configuring Dial Options on page 9-1.

Weekend and Time of Day Lockout

The DSU IV ESP may be configured not to enter dial backup mode
based upon the time of day or weekend status. This protects the
customer from being charged for a switched call during off hours
should the dedicated circuit fail. See Configuring Dial Options on
page 9-1 for more information.
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The DBU Answer Test is disabled if this option is chosen.
DSU IV ESP User Manual 61204011L1-1