4000 Router Series Interface Configuration Guide

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Step Command Remarks

11. (Optional.) Bring up the CE3

interface.

undo shutdown

By default, a CE3 interface is up.

Use this command with caution,

because once an interface is shut

down, it stops operating.

12. Return to system view.

quit N/A

13. Enter synchronous serial

interface view of an interface

formed by a CE3 interfaces.

• interface serial

number/line-number:0

• interface serial

number/line-number:set-numb

N/A

14. Set the CRC mode.

crc { 16 | 32 | none } By default, 16-bit CRC is adopted.

Configure PPP, FR, and IP address for the CE3 interface if the network requires.

Configuration procedure (in CE3 mode)

Shutting down/bringing up a CE3 interface also shuts down/brings up the E1 lines demultiplexed from

the CE3 interface, the serial interfaces formed by the E1 lines, and the serial interfaces created on E1

lines by means of timeslot bundling.

Shutting down/bringing up an E1 line also shuts down/brings up the serial interface formed by it and

the serial interface created on it by means of timeslot bundling.

To shut down/bring up only a serial interface formed by E3 or E1 lines, or by timeslot bundling on an E1

line, run the shutdown/undo shutdown command in the view of the corresponding serial interface.

To configure a CE3 interface in CE3 mode:

Step Command Remarks

1. Enter system view.

system-view N/A

2. Enter CE3 interface view.

controller e3 interface-number N/A

3. Configure the interface to

operate in CE3 mode.

using ce3

The default operating mode is CE3

mode.

4. (Optional.) Set the operating

mode of an E1 line on the CE3

interface to unframed mode or

framed mode.

• Approach 1:

Set the operating mode to

unframed (E1) mode:

e1 line-number unframed

• Approach 2:

Set the operating mode to

framed (CE1) mode and

bundle timeslots on the CE1

interface:

a. (Optional) undo e1

line-number unframed

b. e1 line-number

channel-set set-number

timeslot-list list

By default:

• In approach 1, the operating

mode is CE1.

• In approach 2, the operating

mode is framed, and no

channel sets are created.