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Chapter 4. Applications
61200275L1-1 TSU IQ+ User Manual 4-11
A TSU IQ+ 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. With all DBU cards except for the PRI card, you
can make only one call at a time. The other PVCs to other sites in
this scenario will be inactive. If you have a PRI card you can
originate or answer up to 23 calls.
Information entered into the PVC C
ONFIGURATION
table(seeTable
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 TSU IQ+ 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
thesamemanneraswhentheframerelaycircuitisoperational. For
PVCs not used for DBU operation, leave the DBU P
HONE
N
UMBER
field set for a null entry. Enter a space character from the VT-100
terminal to create a null entry for D
BU
P
HONE
N
UMBER
field.
The DBU P
HONE
N
UMBER
information is only required for the TSU
IQ+ originating the call.
Dial backup application examples are provided in the following
sections.
The configuration selections given may need modification based on your
network configuration.