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Chapter 4. Applications
Minimum Configuration Requirements
The configuration requirements for dedicated PVC management
are identical to those listed for shared PVC management. See the
previous section, Shared PVC Management on page 4-7, for more
information.
DIAL BACKUP APPLICATION
The TSU IQ+ dial backup (DBU) option cards provide single or
multiple site backup, depending on the DBU card option selected.
The TSU IQ+ 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 TSU IQ+ establishes a call to the configured
phone number (see Table 4-1 on page 4-13) 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
TSU IQ+'s two-port design allows the TSU IQ+ 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.
4-10
Carrier NMS
Router
Frame
Relay
TSU IQ+
Figure 4-5. Dedicated PVC Management Application
TSU IQ+ User Manual
Router
TSU IQ+
61200275L1-1
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