Chapter 3: Terminal Menu Operation and Structure
Configuration/Frame Relay
Frame Relay is a connection-oriented service requiring circuits to be config- ured 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: Permanent Virtual Circuits (PVC) and Switched Virtual Circuit (SVC). PVCs are like ded- icated point-to-point private lines. Since the physical 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 L768/L1.5 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
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