Verilink PRISM 41TDM (34-00275.4) Product Manual - Manual (Page 52)

44 C HAPTER 4: T ERMINAL I NTERFACE
DBU Activator
This field allows selecting the alarm the unit uses to activate the dial backup
sequence. The choices are LOS, OOS, OOF, FDL, or ANY alarm thresholds.
DBU Activation Periods
This field allows selecting the time of day that 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 space bar. A setting of [00] - [24] means
that the unit calls out anytime there is an alarm condition on the network. Setting
the first field to 8, for a day, and the second field to 17 allows Dial Backup
operations from 8:00 a.m. to 5:00 p.m. of that day. A setting of [00]-[00], [24]-[24]
(or any matching start and end times) disables DBU for that day.
The DBU command must be set to Enable Daily or Nonrevertive to enable the daily
activation periods.
DBU Mode
This field allows selecting the call response mode for the unit. If set to
ORIGINATE, the unit initiates a call when needed. If set to ANSWER, it only
answers an incoming call. If set to CALLBACK ORIGINATE, it calls the
pre-defined number, issues a password, hangs up, and then waits for the other end
to call back. After the password is delivered in the secure mode, the unit is in
ANSWER mode only. If the setting is CALLBACK ANSWER, the unit waits for a
call and password from the CALLBACK ORIGINATE unit.
DBU Dial String#
This field is used to enter the telephone number of up to 30 characters that the unit
calls. This is a don't care field when the Dial Backup Mode is ANSWER. This
string must include the ATDT command prefix.
Initialization String
This field allows entering the modem initialization string of up to 30 characters.
See the modem documentation for further information. The default setting is
AT&F.
Disconnection String
This field allows entering a character string of up to 30 characters to be output
when the modem session is terminated. The default setting is ATH0.
Reset String
This field allows entering additional initialization commands to be sent during a
DBU failure. To reduce the average DBU connection time, commands are not sent
at every DBU attempt. Consult the external DBU device manual for further
commands.
Internal ISDN Setup
Selecting this command opens the internal ISDN setup screen to allow configuring
the internal ISDN terminal adapter. The setup screen is specific to the optional
terminal adapter. It does not allow entering generic AT commands. Instead, choose
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