Specifications

4-2

PA-T3+ Serial Port Adapter Installation and Configuration

OL-3505-03

Chapter 4 Configuring the PA-T3+

Configuring the Interfaces

After you verify that the new PA-T3+ is installed correctly (the enabled LED goes on), use the

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

available:

• T3+ information such as clock source and framing type

• Protocols you plan to route on each new interface

• IP addresses, if you plan to 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-T3+ 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-T3+ that was

previously configured, the system recognizes the new 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-T3+, refer to the appropriate configuration 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 4-1 for an explanation of the

privileged level of the EXEC.)

This section contains the following subsections:

• Shutting Down an Interface, page 4-2

• Performing a Basic Configuration, page 4-6

• Configuring Timing (Clock) Signals, page 4-8

• Configuring NRZI Format, page 4-11

• Configuring Cyclic Redundancy Checks, page 4-12

• Setting the Bandwidth, page 4-15

• Defining the DSU Mode, page 4-15

• Enabling T3+ Scrambling, page 4-16

• Specifying T3+ Framing, page 4-16

• Setting the Cable Length, page 4-16

Shutting Down an Interface

Before you remove an interface that you will not replace, 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.