Verilink PRISM 41TDM (34-00275.4) Product Manual - Manual (Page 30)

22 C HAPTER 3: F RONT P ANEL I NTERFACE
DBU Command
The choices are as follows.
DISABLE - Does not allow the unit to respond to a dial backup situation.
ENABLE - Allow the unit to respond to a dial backup situation.
DAILY - Allows the unit to respond to a dial backup situation only during the
specified time for that day. Selecting this option causes the Daily Periods
configuration field to appear.
NOREVERT - Allows the unit to respond to a dial backup situation only during
the specified time for that day. Selecting this option causes the Daily Periods
configuration field to appear. The unit remains in Dial Backup mode until the end
of the time, even if the line conditions improve.
FDL alarm triggered DBU is always treated as NON-REVERTIVE.
ACTIVATE - Forces the unit to place a call and switch to the dial backup device.
DBU Activator
This field is used to select the alarm the unit uses to activate the dial backup
sequence. The choices for the DBU Activator are LOS, OOS, OOF, FDL, and any
alarm thresholds.
DBU Mode
This field is used to select the unit’s call response mode.
ORIGINATE - The unit initiates a call when needed.
ANSWER - The unit only answers an incoming call.
CORIG - (Call Back Originate) the unit calls another modem, delivers a password,
and then waits for the other modem to call back.
CANSW - (Call Back Answer) the unit answers a call but checks for a password
before allowing a full connection.
DBU Activation Periods
This field allows selecting the time of day the Dial Backup option is allowed to
place a backup call. The selections for these fields are 0 to 24. The selections can
be scrolled through by pressing the up arrow key. A setting of [00] - [24] means
that the unit calls out any time there is an alarm condition on the network. Setting
the first field to 8, for a day, and the second field to 17 means that the unit allows
Dial Backup operations from 8:00 a.m. to 5:00 p.m. of that day.
The following fields require a string input. Each number is entered using the Scroll
key until the desired character is displayed. The Select key moves the cursor to the
next position. Continue this pattern until the last character has been selected and
press Exit.
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