Display Controller T1 - HP 6600 Command Reference Manual

Syntax
data-coding { inverted | normal }
undo data-coding
Default
Data inversion is disabled.
Views
CT1 interface view
Default command level
2: System level
Parameters
inverted: Enables user data inversion.
normal: Disables user data inversion.
Usage guidelines
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 that 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.
On the CT1 interfaces at two ends of a T1 line, you must use the same data inversion setting.
Examples
# Enable user data inversion on CT1 interface T1 2/0/0.
<Sysname> system-view
[Sysname] controller t1 2/0/0
[Sysname-T1 2/0/0] data-coding inverted

display controller t1

Use display controller t1 to display information about one specified or all CT1 interfaces.
Syntax
display controller t1 [ interface-number ] [ | { begin | exclude | include } regular-expression ]
Views
Any view
Default command level
2: System level
Parameters
interface-number: Interface number. In conjunction with the t1 keyword, it specifies a CT1 interface.
|: Filters command output by specifying a regular expression. For more information about regular
expressions, see Fundamentals Configuration Guide.
begin: Displays the first line that matches the specified regular expression and all lines that follow.
exclude: Displays all lines that do not match the specified regular expression.
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