3Com MSR 50, MSR 30 Display controller t1, Syntax display controller t1 interface-number, 219

219

Use the undo data-codingcommand to restore the default.

By default, data inversion is disabled.

To prevent 7e in valid data from being taken for stuffing characters, HDLC inserts a zero after every five ones in the data stream. Then, HDLC inverts every one bit into a zero and every zero bit into a one. This ensures at least one out of every eight bits is a one. When AMI encoding is adopted on a T1 interface, the use of data inversion can eliminate the presence of multiple consecutive zeros.

At the two ends of the line, the same data inversion setting must be adopted.

Example # Enable user data inversion on CT1/PRI interface T1 2/0.

<Sysname> system-view

[Sysname] controller t1 2/0

[Sysname-T1 2/0] data-coding inverted

display controller t1

Syntax display controller t1 [ interface-number]

View Any view

Parameter interface-number: Interface number. In conjunction with the t1 keyword, it specifies a CT1/PRI interface.

Description Use the display controller t1 command to display information about one specified or all CT1/PRI interfaces.

This command displays the following information about the specified interface:

■Physical state

■Cable type

■Framing

■Clock source (mode)

■Line code format

■Loopback mode

■Line idle code type

■Interframe filling tag type

■Alarm states

■Error statistics gathered at 15-minute intervals during the last 24 hours

Example # Display information about interface T1 2/0.

<Sysname> display controller t1 2/0 T1 2/0 current state :DOWN Description : T1 2/0 Interface

Basic Configuration: