Instruction manual

Control Unit
PRI supports Station Identification/Automatic Number Identification when
your company subscribes to it.
PRI also allows your system to connect to an AT&T DEFINITY telephone
system.
In addition, PRI supports Group IV (G4) fax machines, as well as desktop
and group videoconferencing.
■
T1 Service. This service is cost-effective and convenient for many
businesses. Prior to Release 4.0, it provided voice operation only. In
Release 4.0 and later systems, T1 service provides voice operation or
high-speed data operation. A T1 channel must be programmed either for
voice or data operation and cannot be used for both.
Voice Operation. T1 voice channels can be configured to emulate
different types of trunks for voice (analog) use, according to
business needs. T1 can emulate loop-start, ground-start, Direct
Inward Dial (DID, Hybrid/PBX mode only), and tie trunks. In some
areas, T1 service is less expensive than leasing the equivalent
number of standard telephone company trunks.
You can connect the system’s control unit to another system’s
control unit using an emulated T1 tie trunk programmed for T1-
type voice operation. This arrangement provides voice
communications or analog data communications using modems.
T1 voice operation also supports Megacom WATS and Megacom
800 on a shared line/trunk.
Data Operation. Available in Release 4.0 and later systems, T1
Switched 56 data operation allows switched data communications
at 56 kilobits per second. This supports Accunet

Switched 56
Service, as well as other data communications services. The same
high-speed connectivity can link a MERLIN LEGEND
Communications System to another or to link a MERLIN LEGEND
Communications System to a DEFINITY system. Whether used for
digital tie-trunk emulation or not, a T1 data-operation B-channel
provides data communication only, not voice communications.
System Components
3–11