ADTRAN Express 6120 Manual de Instruções descarregar pdf (Página 66)

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 circuitsto be

configured by your carrierto establish a physical linkbetween twoor

more locations. Multiple virtual circuits (which appear as virtual

point-to-pointlinks)can be run throughthesamephysicalconnection.

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

andteardownisdonebyacarrierviaanetworkmanagementsystem.

SVCs require setup and tear down and are generally not available

fromFrameRelaycarriers. VirtuallyallFrameRelaycommunications

is done using PVCs. The Express 6100/6120 supports PVCs only.

AnumbercalledtheDataLinkConnectionIdentifier(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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ADTRAN Express 6120 Manual de Instruções Página 66