AT&T MERLIN LEGEND Release 2.0 Equipment And Operations Manual page 151

Lines and Trunks
Megacom WATS service for domestic long-distance outward voice calls;
PRI on the system does not support access to international Megacom
WATS service.
Megacom 800 for domestic toll-free incoming voice calls. PRI on the
system does not support access to international Megacom 800 service.
T1 and PRI services support Megacom 800 with or without Dialed
Number Identification Service (DNIS), also called Routing by Dial Plan.
Dialed Number Identification Service (DNIS) is a service provided by the
AT&T Switch Network that routes incoming 800 or 900 calls according to
customer-selected parameters, such as area code, state, or time of call.
For example, a customer can specify that calls received from a particular
area code should be routed to a specific individual or group responsible
for accounts in the area.
Software Defined Network (SDN)—ASN service; for voice and circuit-
switched data calls. SDN lets businesses use portions of the ASN in
concert with their dedicated private line networks. However, the system
does not support "uniform dialing plan," which is necessary for complete
integration with SDN. PRI on the system not support access to global
SDN service.
MultiQuest for domestic toll incoming voice calls (900 number). T1 and
PRI support MultiQuest with or without DNIS.
In addition to these ASN services, T1 and PRI also support Shared Access for
Switched Services (SASS) and Call-by-Call Service Selection. SASS allows both
Megacom and Megacom 800 services to be offered over the same Iine/trunk
facilities, eliminating the need to have separate incoming and outgoing
line/trunk groups.
Like PRI, T1 also supports Megacom WATS and Megacom 800 on a shared
line/trunk, but on a call-by-call basis. Call-by-Call Service Selection provides
more than one outgoing PRI service, such as Megacom WATS, Accunet
Switched Digital 56/64, SDN, OUTWATS, Virtual Private Network Access, and
Long Distance. PRI also provides Accunet switched digital service for 56-kbps,
64-kbps restricted, and 64-kbps clear circuit-switched data calls.
T1
T1 is the factory setting for DS1 facilities, allowing each of the 24 channels to be
programmed to emulate tie, loop-start, ground-start, and DID 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 (CCS) is selected, 23 channels are available for
emulation and the 24th channel carries formatting signals.
The system's control unit can be connected to another system's control unit via
a digital emulated tie trunk on a DS1 facility connected to a 100D module
programmed for T1 -type transmission. A back-to-back connection from one
DS1 facility to the other can be used when the total cable distance is less than
1300 feet (396 meters).
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DS1 Facilities 3-17