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Frame Relay
Frame Relay is a relatively new type of data service which has only
recently become available in Australia from both Telstra and
C&W Optus.
It is based on a model whereby either LAN frames or, more
commonly, higher-layer packets (such as IP datagrams) are
transported through the frame relay network in a "point-to-point"
manner using "permanent virtual circuits" (PVCs) to define the two
endpoints, eg:

Note that frame relay standards also allow for "switched virtual
circuits", but these are not (yet?) available in Australia. Here's
a useful
tutorial on frame relay.
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