Voice T1 Trunk Command Set - ADTRAN AOS Version R10.1.0 Command Reference Manual

Command Reference Guide

Voice T1 Trunk Command Set

V T1 T C S
OICE RUNK OMMAND ET
Voice T1 trunks are trunks that use T1 circuits and robbed-bit signaling (RBS) to connect communication
devices to the outside world. The T1 RBS trunk can terminate a line from the service provider, or be a
termination point acting as the network to a private branch exchange (PBX) or key system requiring a T1
circuit. The term T1 circuit is commonly used to identify a multiplexed 24-channel, 1.544 Mbps digital
data circuit, providing communications between two facilities or from a local service provider. T1 refers to
the transport of a DS1-formatted signal onto a copper, fiber, or wireless medium for deploying voice, data,
or video conferencing services. T1 connections provide up to 24 DSO channels of 64kbps, and use the
RBS scheme to pass call signaling status information.
RBS is the process where the least significant bit in the sixth and twelfth frame (of a superframe (SF) T1)
and the sixteenth and twentieth frame (of an extended superframe (ESF) T1) is robbed for voice A, B, C,
and D signaling bits. These signaling bits indicate on-hook or off-hook conditions, as well as other
signaling states.
Before configuring a T1 voice trunk, the T1 interface must be configured. For more information on
configuring the T1 interface, refer to the T1 Interface Command Set on page 1913. Once the T1 interface is
configured, you must create a T1 trunk account in order to make and receive calls. When creating the T1
trunk account, it is important to make sure the T1 RBS settings (supervision, type, etc.) match the
parameters set by your service providers.
There are six main types of T1 trunks supported by AOS. The first is a T1 trunk without RBS, the second
is a T1 RBS trunk using feature group D (FGD), the third is a T1 RBS trunk using ground start (GS), the
fourth is a T1 RBS trunk using loop start (LS), the fifth is a T1 RBS trunk using wink, and the sixth is a T1
RBS trunk using immediate supervision.
To create a T1 trunk account without RBS and enter the Trunk Account Configuration mode, enter the
following command at the Global Configuration mode prompt. For example:
>enable
#configure terminal
(config)#voice trunk t01
(config-t01)#
To create a T1 RBS trunk account using FGD and enter the Trunk Account Configuration mode, enter the
following command at the Global Configuration mode prompt. For example:
>enable
#configure terminal
(config)#voice trunk t01 type t1-rbs supervision fgd role user
(config-t01)#
60000CRG0-35E Copyright © 2012 ADTRAN, Inc. 3603