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Chapter 4. Applications

61200214L1-20 IQ Probe User Manual 4-11

DIAL BACKUP APPLICATION

The IQ Probe dial backup (DBU) option cards provide single site backup.

The IQ Probe can be configured to originate a call based on physical layer

conditions (i.e., port failures) and/or PVC outages. Once the criteria are

met, the IQ Probe establishes a call to the configured phone number (see

Table 4-1 on page 4-12) and the connection is used to carry traffic for the

PVC(s) configured for DBU operation.

In the case of PVC outages (not physical layer port failure), the IQ Probe's

two-port design allows the IQ Probe receiving the call to continue to use

the T1 frame relay circuit for PVCs that are not affected by the outage.

This is done (without the attached DTE device's intervention) by

modifying the status of PVCs that are in DBU state to active when the

PVC status is given to the DTE.

An IQ Probe with multiple PVCs to multiple sites can also originate a call

to one site during an outage and restore connection for PVCs to that

destination. The other PVCs to other sites in this scenario will be inactive.

Information entered into the PVC C

ONFIGURATION

table (see Table 4-2 on

page 4-13) marks PVCs for DBU operation. The key element in each entry

of the table is the DBU DLCI. For each PVC connecting two sites for DBU

operation, the DLCI field represents the PVC DLCI at the local UNI and

the DBU DLCI represents the PVC DLCI at the remote site UNI. The IQ

Probe uses this information in the outbound side to change the PVC DLCI

so the far end DTE device receives frames on the DBU PVC addressed in

the same manner as when the frame relay circuit is operational. For PVCs

not used for DBU operation, leave the DBU P

HONE

UMBER

field set for a

null entry. Enter a space character from the VT-100 terminal to create a

null entry for DBU P

HONE

UMBER

field.

The DBU P

HONE

UMBER

is only required for the IQ Probe originating the

call.

Since the IQ Probe can only make one call at a time, only one

backup PVC will be active.

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