ADTRAN AOS Version R10.1.0 Command Reference Manual page 1916

Command Reference Guide
fdl
Use the fdl command to configure the format for the facility data link (FDL) channel on the T1 circuit.
FDL channels are only available on point-to-point circuits. Use the no form of this command to return to
the default value. Variations of this command include:
fdl ansi
fdl att
fdl none
Syntax Description
ansi
att
none
Default Values
By default, the FDL is configured for ansi.
Command History
Release 1.1
Functional Notes
T1 circuits using extended superframe (ESF) framing format (specified using the framing command)
reserve 12 bits as a data link communication channel, referred to as the FDL, between the equipment on
either end of the circuit. The FDL allows the transmission of trouble flags, such as the Yellow Alarm signal.
Refer to framing on page 1917
Usage Examples
The following example disables the FDL channel for the T1 circuit:
(config)#interface t1 1/1
(config-t1 1/1)#fdl none
60000CRG0-35E
Configures the FDL for ANSI T1.403 standard.
Configures the FDL for AT&T TR 54016 standard.
Disables FDL on this circuit.
Command was introduced.
for related information.
Copyright © 2012 ADTRAN, Inc.
T1 Interface Command Set
1916