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Customizing Synchronous and Asynchronous Lines

4-23

Editing LAPB Protocol Parameters

The Link Access Procedure Balanced (LAPB) protocol is a version of the

high-level data link control (HDLC) protocol. Bay Networks routers use the

services of LAPB to initialize the link between the router and the local DCE

device, and to frame X.25 data packets before transmitting them to the DCE.

The LAPB information ﬁeld contains the X.25 packets. Once an X.25 packet

reaches the destination router, the LAPB protocol strips away the LAPB frame

and delivers the packet to the network layer for further processing. For detailed

information on X.25, refer to Conﬁguring X.25 Services.

When you conﬁgure X.25 on a Bay Networks AN or ASN router, or on an Octal

Sync link module line, Site Manager automatically conﬁgures LAPB.

To edit LAPB protocol parameters:

1. Start at the Edit SYNC Parameters window (refer to Figure 4-1).

2. Click on LAPB.

The Edit LAPB Parameters window appears (F

igure 4-4). Use the window’s

scroll bar to view all of the LAPB line parameters.

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Avaya Configuring Line Services Manual do Utilizador Página 123