8
Setting Up the DBM
Once the DBM is installed, it must be set up for dial backup. Another DBM must be
installed at the far end before backup can take place.
The DBM at one end of the link must be set up to place a call when there is a failure
and the other DBM must be configured to answer the call. The recommended method
is for remote sites to place the calls (usually with BRI DBMs) and for the central site to
answer calls (usually with a PRI DBM).
The following guidelines apply.
Central site configuration guidelines:
– Configure a Link Profile for each remote site.
– Configure the unit to answer calls from the remote sites.
– Leave Automatic Backup Configuration disabled.
– Manually create alternate DLCIs on the ISDN Backup Link.
– Manually specify ISDN DLCIs as alternate DLCIs for the PVC Connection after
the primary DLCIs have been automatically discovered from the primary network
Link LMI or manually configured.
Remote site configuration guidelines:
– Configure a Link Profile for the central site in the first link profile, called HQ_Site.
This ensures that a backup DLCI will be created automatically on the backup
link for each DLCI discovered on the network interface using the central site’s
link profile.
– Configure the unit to originate calls to the central site if it is a FrameSaver 9128.
A FrameSaver 9126 is already configured to originate calls.
– Enable the Automatic Backup Configuration feature if the unit is a
FrameSaver 9128. A FrameSaver 9126 already has this feature enabled.
To set up the DBM for dial backup:
1. Configure the DBM interface.
Main Menu
→
Configuration
→
ISDN
→
Physical
2. Minimally, set the following configuration options:
– Interface Status is set to Enable.
– Originate or Answer is set to Answer for a central site, and set to Originate for a
remote site.
– Local Phone Number 1 is entered, plus the following:
FrameSaver 9126 with BRI
FrameSaver 9128 with PRI
Configure the B-channels:
Service Profile ID1 (SPID)
Local Phone Number 1
Service Profile ID2 (SPID)
Local Phone Number 2
Configure T1 physical characteristics
to match the service provider’s
settings.
Local Phone Number
