R0106-HP MSR Router Series Interface Command Reference(V7)

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data-coding (CT1/PRI interface)
Use data-coding to enable user data inversion on a 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 mistaken for padding characters, HDLC inserts a bit 0 after every
five bit 1 in the data stream. In data inversion, every bit is changed into its opposite value. (Bit 1 is
changed into bit 0, and bit 0 changed into bit 1.) After the inversion, at least one bit 1 is present in every
eight consecutive bits.
When AMI encoding is used on a T1 interface, data inversion eliminates the presence of multiple
consecutive zeros.
The data inversion setting must be the same on the CT1/PRI interfaces at two ends of a T1 line.
Examples
# Enable user data inversion on T1 2/4/0.
<Sysname> system-view
[Sysname] controller t1 2/4/0
[Sysname-T1 2/4/0] data-coding inverted
display controller t1
Use display controller t1 to display information about CT1/PRI interfaces.
Syntax
display controller t1 [ interface-number ]
Views
Any view
Predefined user roles
network-admin
network-operator