Kamoto
There are normally 2 basic methods of interworking ATM with Frame Relay
which are normally handled by a FRATM.
They are: Network Interworking Function (NIWF)
Service Interworking Function (SIWF)
NIWFs work in pairs, have both a Frame i/f and an ATM cell based i/f.
Basically they carry the Frame Relay frame less flags and fcs. As far as
the Frame Relay nodes are concerned, you are effectively using the ATM
cloud as a virtual piece of wire. You can carry many dlcs in a single
virtual channel.
You only need 1 SIWF, again it has both a Frame i/f and a cell i/f. It
takes the payload out of Frame Relay and repackages it into ATM. You
require a separate virtual channel for each dlc.
Both normally use aal5 encapsulation.
Hope this helps
Peter
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