R3303-HP HSR6800 Routers Interface Command Reference

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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 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 the presence of multiple consecutive zeros.
At the two ends of a T1-F line, the same data inversion setting must be adopted.
Examples
# Enable user data inversion on T1-F interface Serial 2/0/0.
<Sysname> system-view
[Sysname] interface serial 2/0/0
[Sysname-Serial2/0/0] ft1 data-coding inverted
ft1 fdl
Use ft1 fdl to set the behavior of the T1-F interface on the FDL in ESF framing.
Use undo ft1 fdl to restore the default.
Syntax
ft1 fdl { ansi | att | both | none }
undo ft1 fdl
Default
FDL is disabled.
Views
T1-F interface view
Default command level
2: System level
Parameters
ansi: Adopts ANSI T1.403 for FDL.
att: Adopts AT&T TR 54016 for FDL.
both: Adopts both ANSI T1.403 and AT&T TR 54016 for FDL.
none: Disables FDL.
Usage guidelines
FDL is an embedded 4 kbps overhead channel within the ESF format for transmitting performance
statistics or loopback code.
You can however change the setting depending on the setting at the far end.
Examples
# Set ANSI T1.403 FDL on T1-F interface Serial 2/0/0.