Installation guide

5-28 Cisco 4000 Series Installation Guide

Additional Configuration Tasks

Note For older versions of software, use the write mem command to write

the new conﬁguration to memory.

Step 7 Enter the disable command to return to the user level:

Router# disable

Router>

Step 8 Enter the show commands to check the conﬁguration of the interface.

Note On Step 2, the serial interface numbers for the low-speed ports can be 2–17 or 20–35

as previously described in Table 4-4.

Conﬁguring G.703/G.704 Interfaces

This section describes how to conﬁgure individual interfaces for framed or unframed mode,

four-bit CRC, loopback, and for specifying a clock source.

When you have veriﬁed that the new G.703/G.704 network processor modules are installed

correctly (the enabled LED goes on), use the privileged-level conﬁgure command to

conﬁgure the new interfaces.

Be prepared with the information you will need, such as the following:

• Timing source for each new interface (a line-derived or internal clock signal)

• Whether you will use framed or unframed mode on E1-G.703/G.704 interfaces

The following are the default settings for all E1-G.703/G.704 interfaces; each can be

enabled or disabled:

• Unframed mode

• No CRC enabled

• Time slot 16 is not used for payload

• No loopback