Ft1 Data-Coding - H3C MSR 20-20 Command Reference Manual

Parameter
Description
Example

ft1 data-coding

Syntax
View
Parameter
Description
Example
ami: Adopts AMI line code format.
b8zs: Adopts B8ZS line code format.
Use the command to set the line code format for the T1-F interface.
ft1 code
Use the
undo ft1 code
Keep the line code format of the interface in consistency with the one used on the
remote device.
# Set the line code format of T1-F interface Serial 2/0 to AMI.
<Sysname> system-view
[Sysname] interface serial 2/0
[Sysname-Serial2/0] ft1 code ami
ft1 data-coding { inverted | normal }
undo ft1 data-coding
T1-F interface view
inverted: Enables user data inversion.
normal: Disables user data inversion.
Use the
ft1 data-coding normal
T1-F interface.
Use the ft1 data-coding inverted
T1-F interface.
Use the
undo ft1 data-coding
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 at least one out of every
eight bits is a one. When AMI encoding is adopted on a T1-F interface, the use of
data inversion can eliminate presence of multiple consecutive zeros.
At the two ends of a T1-F line, the same data inversion setting must be adopted.
# Enable user data inversion on T1-F interface Serial 2/0.
<Sysname> system-view
[Sysname] interface serial 2/0
[Sysname-Serial2/0] ft1 data-coding inverted
command to restore the default, that is, B8ZS.
command to disable user data inversion for a
command to enable user data inversion for a
command to restore the default.
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