Chapter 4. Applications

During dial backup, the IQ device receiving the call continues to use the frame relay circuit for PVCs that are not affected by the outage, while using the DBU interface for PVCs that are inactive due to 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 connec- tion for PVCs to that destination. Since the IQ Probe can only make one call at a time, the other PVCs to other sites in this scenario will be inactive.

Information entered into the PVC Configuration Table (see Table 4-B) 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 DLCI field set to zero.

The DBU DLCI information is only required for the IQ Probe originating the call. In cases such as remote sites establishing calls to host sites, the remote site should have only non-zero values for the DBU DLCI fields in the PVC Configuration Table.

Only PVCs that are used in DBU should have the DBU DLCI set to a non-zero value.

The range for the DBU DLCI field is from 16-1007. Therefore, you cannot manually enter 0 for the PVCs not used in DBU. When an entry is first created with the ADD selection, it is set to 0 by default. To reset a previously configured DBU DLCI to 0, delete the entry and then add it back in (using the DELETE and ADD selections).

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IQ Probe User Manual

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ADTRAN 1200214L1, 1204002L1, 1204006L1 user manual Applications
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1204002L1, 1200214L1, 1204006L1 specifications

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