4000 Router Series Interface Command Reference

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Usage guidelines

FDL is an embedded 4 kbps overhead channel within the ESF format for transmitting performance

statistics or loopback code.

You can change the setting depending on the setting at the far end.

Examples

# Set ANSI FDL on T1-F interface Serial 2/0.

<Sysname> system-view

[Sysname] interface serial 2/0

[Sysname-Serial2/0] ft1 fdl ansi

Related commands

ft1 frame-format

Use ft1 frame-format to set the framing format on the T1-F interface.

Use undo ft1 frame-format to restore the default.

Syntax

ft1 frame-format { esf | sf }

undo ft1 frame-format

Default

The framing format on the T1-F interface is esf.

Views

T1-F interface view

Predefined user roles

network-admin

Parameters

esf: Sets the framing format on the T1-F interface to ESF.

sf: Sets the framing format on the T1-F interface to SF.

Usage guidelines

T1-F interfaces support two framing formats, SF and ESF. In SF format, multiple frames can share the same

FSC and signaling information, so that more significant bits are available for transmitting user data. The

use of ESF allows you to test the system without affecting the ongoing service.

Examples

# Set the framing format of T1-F interface Serial 2/0 to SF.

<Sysname> system-view

[Sysname] interface serial 2/0

[Sysname-Serial2/0] ft1 frame-format sf

Related commands

ft1 fdl