3Com 10014299 manual Set the operating mode of T1 channel, Set CRC of the serial interface

152CHAPTER 10: CONFIGURING WAN INTERFACE

By default, CT3 mode is used.

When CT3 interface works in T3 mode, the system will automatically create a serial interface whose number is serial number/0:0 and whose rate is 44.736Mbps. The interface has the same logic feature as that of a synchronous serial interface; therefore, it can be regarded as a synchronous serial interface for further configuration.

Table 183 Set the operating mode of T1 channel

Operation	Command
Configure T1 channels of CT3 interface to work	t1 line-number unframed
in T1 mode (unframed mode)
Configure T1 channels of CT3 interface to work	undo t1 line-numberunframed
in CT1 mode (framed mode)
Implement time slot binding on the CT1 interface	t1 line-numberchannel-set
	set-number timeslot-listrange
	[ speed { 56 64 } ]
Disable time slot binding on the CT1 interface	undo t1 line-numberchannel-set
	set-number

The operation mode of T1 channels defaults to CT1 mode.

When T1 channel works in T1 mode (unframed mode), the system will automatically create a serial interface whose number is serial number / line-number:0and whose rate is 1544kbps. The interface has the same logic feature as that of a synchronous serial interface; therefore, it can be regarded as a synchronous serial interface for further configuration.

When T1 channel works in CT1 mode (framed mode), timeslot binding can be performed on it. The system will automatically create a serial interface whose number is serial number / line-number:set-numberand whose rate is N x 64 kbps or N x 56 kbps. The interface has the same logic feature as that of a synchronous serial interface; therefore, it can be regarded as a synchronous serial interface for further configuration.

7Set CRC of the Serial Interface

For the serial interface formed by T3, the one formed by T1 channel or the one bundled by T1 channel timeslots, its CRC can be configured in the corresponding serial interface view.

Table 184 Set CRC of the serial interface

Operation	Command
Set CRC of the Serial Interface	crc { 16 32 none }
Restore CRC of the Serial Interface to default value	undo crc

By default, the serial interface uses 16-bit CRC.

Display and Debug CT3 The display and debug operations of CT3 interface include disabling interface and Interface displaying interface information. But you should be careful when using the

shutdown command, because disabling an interface will cause the interface to stop working.

Perform the following configuration in CT3 interface view.