HP MSR2000/3000/4000 Router Series Interface Command Reference

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controller t1
Use controller t1 to enter CT1/PRI interface view.
Syntax
controller t1 number
Views
System view
Predefined user roles
network-admin
Parameters
number: Specifies a CT1/PRI interface by its number.
Examples
# Enter the view of interface T1 2/0.
<Sysname> system-view
[Sysname] controller t1 2/0
[Sysname-T1 2/0]
data-coding (CT1/PRI interface)
Use data-coding to enable user data inversion on the CT1/PRI interface.
Use undo data-coding to restore the default.
Syntax
data-coding { inverted | normal }
undo data-coding
Default
Data inversion is disabled.
Views
CT1/PRI interface view
Predefined user roles
network-admin
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
makes sure 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/PRI interfaces at two ends of a T1 line, you must use the same data inversion setting.