AT&T MERLIN LEGEND Installation & Maintenance Manual page 86

System Description
Any combination of these ASN services can be used in T1 or
ISDN-PRI.
In addition to these ASN services, T1 also supports Shared
Access for Switched Services (SASS). SASS allows both
Megacom WATS and Megacom 800 services to be offered over
the same line/trunk facilities, eliminating the need to have
separate incoming and outgoing Iine/trunk groups.
Like T1, ISDN-PRI also supports Megacom WATS and Megacom
800 services on a shared line/trunk, but only on a call-by-call
basis. Besides this, ISDN-PRI provides Accunet® Switched
Digital Service for 56-kbps, 64-kbps restricted, and 64-kbps
clear circuit-switched data calls. However, Accunet Switched
Digital Service is not supported for international dialing.
T1
T1 is the factory setting and is selected for the DS1 facility to
allow each of the 24 channels to be programmed to emulate tie,
LS, or GS lines/trunks in any combination. This means that a
single 100D module can take the place of 24 regular outside
lines.
If common-channel signaling is selected, 23 channels are
available for emulation and the 24th channel carries formatting
signals.
ISDN-PRI
ISDN-PRI is a standard format for ISDN service. Some of the
benefits of ISDN-PRI service are
Speed. Data calls to outside destinations can be established
on the same B channels used for voice calls if the service
allows. Modems and dedicated, conditioned lines/trunks are
not needed.
DS1 Capabilities 1-55