Specifications

5-2

PA-8T-V.35 Synchronous Serial Port Adapter Installation and Configuration

OL-3563-03

Chapter 5 Configuring the PA-8T-V.35 Interfaces

Configuring the Interface

After you verify that the new PA-8T-V.35 is installed correctly (the enabled LED goes on), use the

privileged-level configure command to configure the new interfaces. Have the following information

available:

• Protocols you plan to route on each new interface

• IP addresses if you will configure the interfaces for IP routing

• Bridging protocols you plan to use

• Timing source for each new interface and clock speeds for external timing

If you installed a new PA-8T-V.35 or if you want to change the configuration of an existing interface,

you must enter configuration mode to configure the new interfaces. If you replaced a PA-8T-V.35 that

was previously configured, the system recognizes the new PA-8T-V.35 interfaces and brings each of

them up in their existing configuration.

For a summary of the configuration options available and instructions for configuring interfaces on a

PA-8T-V.35, refer to the publications listed in the “Related Documentation” section on page viii.

You execute configuration commands from the privileged level of the EXEC command interpreter, which

usually requires password access. Contact your system administrator, if necessary, to obtain password

access. (See the “Using the EXEC Command Interpreter” section on page 5-1 for an explanation of the

privileged level of the EXEC.)

This section contains the following subsections:

• Shutting Down an Interface, page 5-2

• Performing a Basic Configuration, page 5-8

• Configuring Timing (Clock) Signals, page 5-10

• Configuring NRZI Format, page 5-13

• Configuring Cyclic Redundancy Checks, page 5-14

Shutting Down an Interface

Before you remove an interface that you will not replace, replace a compact serial cable, or replace port

adapters, use the shutdown command to shut down (disable) the interfaces to prevent anomalies when

you reinstall the new or reconfigured interface processor. When you shut down an interface, it is

designated administratively down in the show command displays.

Follow these steps to shut down an interface:

Step 1 Enter the privileged level of the EXEC command interpreter (also called enable mode). (See the “Using

the EXEC Command Interpreter” section on page 5-1 for instructions.)

Step 2 At the privileged-level prompt, enter configuration mode and specify that the console terminal is the

source of the configuration subcommands, as follows:

Router# configure terminal

Enter configuration commands, one per line. End with Crtl-Z.

Router(config)#

Step 3 Shut down interfaces by entering the interface serial subcommand (followed by the interface address of

the interface) and then enter the shutdown command. Table 5-1 shows the command syntax.