4000 Router Series Interface Command Reference

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Parameters

ami: Adopts AMI line code format.

hdb3: Adopts HDB3 line code format.

Usage guidelines

Keep the line code format of the interface in consistency with the one used on the remote device.

To ensure normal operation of the interface, configure the fe1 data-coding inverted command on it when

its line code format is set to AMI.

Examples

# Set the line code format of E1-F interface Serial 2/0 to AMI.

<Sysname> system-view

[Sysname] interface serial 2/0

[Sysname-Serial2/0] fe1 code ami

Related commands

fe1 data-coding

Use fe1 data-coding to enable or disable user data inversion for an E1-F interface.

Use undo fe1 data-coding to restore the default.

Syntax

fe1 data-coding { inverted | normal }

undo fe1 data-coding

Default

Data inversion is disabled.

Views

E1-F 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

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.