ADTRAN Express 6100, Manual

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Chapter 3. Terminal Menu Operation and Structure
3-32 Express 6100/6120 User Manual 61200176L1-1
» Configuration/Frame Relay
Frame Relay is a connection-oriented service requiring circuits to be
configured by your carrier to establish a physical link between two or
more locations. Multiple virtual circuits (which appear as virtual
point-to-point links) can be run through the same physical connection.
There are two types of virtual circuits supported in Frame Relay: Per-
manent Virtual Circuits (PVC) and Switched Virtual Circuit (SVC).
PVCs are like dedicated point-to-point private lines. Since the physi-
cal connection is always there in the form of a leased line, call setup
and tear down is done by a carrier via a network management system.
SVCs require setup and tear down and are generally not available
from Frame Relay carriers. Virtually all Frame Relay communications
is done using PVCs. The Express 6100/6120 supports PVCs only.
A number called the Data Link Connection Identifier (DLCI) identifies
each virtual circuit within a shared physical channel.
Figure 3-8 shows the Frame Relay menu.
Figure 3-8. Configuration/Frame Relay Screen