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Configuring Synchronous Services

117345-B Rev. 00

2-35

LAPB Implementation on Bay Networks Routers

The implementation of the LAPB protocol differs among Bay Networks routers.

On the AN, ANH, ARN, and ASN routers, and on the BN

and LN

routers with

the Octal Sync link module, LAPB is implemented in the software. For all other

link modules, LAPB is implemented in the hardware, and you cannot configure

LAPB line parameters.

Bay Networks routers use LAPB services to initialize the link between the router

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

DCE. X.25 uses the LAPB protocol at the data link layer to:

• Initialize the link between the DTE and the local DCE

• Frame X.25 data packets before transmitting them to the DCE

The LAPB information field contains the X.25 packets.When 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, see Configuring X.25 Services.

LAPB Parameters

This section describes how to edit LAPB parameters. It covers the following

topics:

• Enabling or Disabling LAPB Services

• Setting the Station Type

• Setting the Control Field

• Setting the Maximum N1 Frame Size

• Setting the Window Size

• Setting the Maximum N2 Retry Count

• Setting the Maximum T1 Acknowledge Timer

• Setting the Maximum T2 Acknowledge Timer

• Setting the Maximum T3 Disconnect Timer

• Setting the Link Setup Action

• Enabling or Disabling Test Exchange Identification (XID) Frames

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Avaya Configuring WAN Line Services Manual do Utilizador Página 69