
Main Menu 47
circuit such as PSTN or ISDN line. The Dial Backup screen (Figure 4-14) allows
you to configure the DBU parameters.
Figure 4-14
DBU Parameters Screen
Status
Shows the current state in the left brackets and the programming choices in the
right brackets.
DISABLED - DBU has been disallowed via the Command field.
ENABLED - The DBU is allowed but is not currently needed.
DISALLOWED - The DBU has been set for ENABLE DAILY but the current time
is outside of the allowed window specified by the DBU Activation Periods fields.
DIALING, CONNECTING - Establishment of the DBU is in progress.
ANSWERING - The unit is waiting for the other end to call it.
ACTIVE - The DBU is currently active.
Command
The available DBU commands are as follows:
DISABLE - DBU is disabled.
ENABLE - The DBU will activate when the DDS line fails.
ENABLE DAILY - The DBU will only activate if the time is set in the DBU
Activation Periods.
ACTIVATE - Manually activates the DBU function.
Activator
This field allows you to select the criteria the unit uses to activate the dial backup
sequence. The choices are LOS
, OOS, OOF, or ANY alarm thresholds.
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