IBM SC30-3681-08 manual Conguring Serial Line Interfaces, Clocking and Cable Type, 317

Chapter 25. Con®guring Serial Line Interfaces

This chapter describes the interface con®guration process for a serial interface and includes the following sections:

v ªAccessing the Interface Con®guration Processº

v ªNetwork Interfaces and the GWCON Interface Commandº on page 318

IMPORTANT: To con®gure Frame Relay, PPP, X.25, V.25bis, V.34, Bisync, SDLC Relay, and SDLC protocols on the serial interface, use the commands in this chapter and then refer to the commands in the chapters that describe the speci®c protocol.

See ªCon®guring the Network Interfaceº on page 17 for a table of protocols and the interfaces that support those protocols.

Accessing the Interface Con®guration Process

To access the interface con®guration process for a serial interface, ®rst access the

Config> prompt and issue the command set data-link. Next, at the Config> prompt,

enter the interface type and number to access the con®guration environment for the

interface.

For example, to con®gure a serial interface for X.25, you must access theX.25

config> environment by issuing the following commands:

Config> set data-link X25 2

Config> network 2

From the X.25 config> environment, you can complete your con®guration of X.25

on the serial interface. See ªChapter 26. Using the X.25 Network Interfaceº on

page 319.

When you are done con®guring the serial interface, enter therestart command

after the OPCON prompt (*) and respond yes to the prompt to enable the new

con®guration.

Clocking and Cable Type

This section applies to all uses of a serial port for: FR, PPP, X.25, SDLC Relay,

Bisync,and SDLC.

If a modem or CSU/DSU is attached to the serial port then the router is taking on

the DTE role in terms of clocking on the line, so con®gure a DTE cable type and

external clocking.

If you want to attach two routers directly without a modem, CSU/DSU, or modem eliminator, then one of the routers will take on the DCE role in terms of clocking on the line. Connect a direct attach cable to the router that will act as the DCE and con®gure the following parameters for its serial interface.

1.A DCE cable type

2.Internal clocking

3.The clocking/line speed

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