Avaya Configuring Frame Relay Services User Manual download pdf (Page 19)

1-1

Chapter 1

Frame Relay Overview

Frame Relay is a high-speed, packet-switching WAN protocol that enables the

interconnection of geographically dispersed LANs. Frame Relay is usually

offered by a public network provider; however, private organizations can own and

manage their own Frame Relay networks as well.

Frame Relay is a connection-oriented protocol, which means that it relies on an

existing end-to-end path between devices connected across the network. It

implements these connections using

permanent virtual circuits (PVCs).

A PVC is a logical path that the network provides to connect two devices. This

path between the source and destination point is a dedicated connection, so the

PVC is always available to the connected devices. Since many PVCs can coexist,

devices can share the bandwidth of the transmission line.

Figure 1-1 illustrates a Frame Relay network.

Figure 1-1. Frame Relay Network

Router

Frame Relay

Network

Router

VC=virtual circuit

Switch

Frame Relay defines the interface between

the DTE (router) and the DCE (switch)

Switch

FR0001A

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Avaya Configuring Frame Relay Services User Manual Page 19