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Chapter 25. Configuring Serial Line Interfaces
This chapter describes the interface configuration process for a serial interface and
includes the following sections:
v “Accessing the Interface Configuration Process”
v “Network Interfaces and the GWCON Interface Command” on page 318
IMPORTANT: To configure 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 specific protocol.
See “Configuring the Network Interface” on page 17 for a table of protocols and the
interfaces that support those protocols.
Accessing the Interface Configuration Process
To access the interface configuration process for a serial interface, first 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 configuration environment for the
interface.
For example, to configure a serial interface for X.25, you must access the X.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 configuration of X.25
on the serial interface. See “Chapter 26. Using the X.25 Network Interface” on
page 319.
When you are done configuring the serial interface, enter the restart command
after the OPCON prompt (*) and respond yes to the prompt to enable the new
configuration.
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 configure 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
configure the following parameters for its serial interface.
1. A DCE cable type
2. Internal clocking
3. The clocking/line speed
© Copyright IBM Corp. 1994, 1998 317
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