ADTRAN 1200350L1 Manual do Utilizador descarregar pdf (Página 62)

Chapter 4: Configuration Overview

4-26

Router Option Module User Manual 61200350L1-1

Frame Relay

(also available via Front Panel)

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 connec-

tion.

There are two types of virtual circuits supported in Frame Relay:

The Router Option Module supports PVCs only.

The Data Link Connection Identifier (DLCI) number identifies each

virtual circuit within a shared physical channel.

Virtual Circuit Types Description

Permanent Virtual Circuits

(PVC)

PVCs are like dedicated 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 car-

rier via a network management sys-

tem.

Virtually all Frame Relay communica-

tion is done using PVCs.

Switched Virtual Circuit

(SVC)

SVCs require setup and tear down and

are generally not available from Frame

Relay carriers.

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ADTRAN 1200350L1 Manual do Utilizador Página 62