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Cell Relay Retreat>List Archive>month:1998-Dec> msg00124



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Interworking PSTN and ATM

  • From: Debayan Chaudhuri <debayan@rocketmail.com>
  • Date: 29 Dec 1998 22:29:49 GMT

Distribution: world

Hello all,

   I would really appreciate some pointers on the
issue of interworking between PSTN and ATM networks.
If a PSTN call needs to be routed through an ATM
network ( eg. offloading of data traffic from the
congested PSTN ), I understand that there needs to be
interworking between SS7 ( N-ISUP ) and B-ICI (
B-ISUP ) in order to establish the call. But what if
if the ATM network does not support B-ICI ? Should we
try to interwork between SS7 and Q.2931 ( the local
PSTN switch is treated as an ATM end-point )? Or
between SS7 and P-NNI ( the local switch is treated
as an ATM network node ) ?

    Interworking between N-ISUP and B-ISUP is
specified in ITU-T Q.2660. But while interworking
between SS7 and P-NNI ( say ), how do we map physical
circuit identifiers ( N-ISUP ) with virtual circuit
identifiers ( ATM ) ? There must be T1/T3 links
connecting the PSTN switch with the ATM network node.

Thanks in advance,
Debayan Chaudhuri.





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