Command Reference Guide

SROS Command Line Interface Reference Guide T1 Interface Configuration Command Set
5991-2114 © Copyright 2005 Hewlett-Packard Development Company, L.P. 507
fdl [ansi | att | none]
Use the fdl command to configure the format for the facility data link 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.
Syntax Description
ansi Configures the FDL for ANSI T1.403 standard
att Configures the FDL for ATT TR54016 standard
none No FDL available on this circuit
Default Values
<format> ansi
Command Modes
(config-t1 1/1)# T1 Interface Configuration Mode required
Functional Notes
T1 circuits using ESF framing format (specified using the framing command) reserve 12 bits as a data link
communication channel, referred to as the Facility Data Link (FDL), between the equipment on either end
of the circuit. The FDL allows the transmission of trouble flags such as the Yellow Alarm signal. See
framing [d4 | esf] on page 508 for related information.
Usage Examples
The following example disables the FDL channel for the T1 circuit:
(config)#interface t1 1/1
(config-t1 1/1)#fdl none