Fe1 Frame-Format - HP MSR series Command Reference Manual

Default
Data inversion is disabled.
Views
E1-F 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 at least one out of every eight bits is a one. When AMI encoding is adopted on an
E1-F interface, the use of data inversion can eliminate presence of multiple consecutive zeros.
At the two ends of an E1-F line, the same data inversion setting must be adopted.
Examples
# Enable user data inversion on E1-F interface Serial 2/0.
<Sysname> system-view
[Sysname] interface serial 2/0
[Sysname-Serial2/0] fe1 data-coding inverted

fe1 frame-format

Use fe1 frame-format to configure the framing format of the E1-F interface.
Use undo fe1 frame-format to restore the default.
Syntax
fe1 frame-format { crc4 | no-crc4 }
undo fe1 frame-format
Default
The framing format of the E1-F interface is no-CRC4.
Views
E1-F interface view
Default command level
2: System level
Parameters
crc4: Sets framing format to CRC4.
no-crc4: Sets framing format to no-CRC4.
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