MERLIN LEGEND Communications System Release 6.1
System Manager’s Guide
555-661-118
Issue 1
August 1998
System Components
Page 3-9Control Unit
3
■ 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 for either
voice or data operation and cannot be used for both.
NOTE:
In Release 6.0 and later systems (Hybrid/PBX mode only), tandem
PRI lines can be used for networking. In this case, you order a T1
facility and program it for PRI operation. For more information, see
the
Network Reference
.
— 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. T1 also allows access to network subscriber options
such as toll-free domestic long-distance services.
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.
— Data Operation. Available in Release 4.0 and later systems, T1
Switched 56 data operation allows switched data communications at
56 kbps. The same high-speed connectivity can link a MERLIN
LEGEND Communications System to another; or it can link a MERLIN
LEGEND Communications System to a DEFINITY system. Whether
used for digital tie-trunk emulation or not, a T1 data-operation channel
provides data communications only, not voice communications.
800 NI-BRI Module 3
Available for Release 4.0 and later systems, this module supplies eight line/trunk
jacks for connecting central office facilities that use the standard National
Integrated Services Digital Network 1 (ISDN-1) protocol and the Basic Rate
Interface (BRI) access arrangement (this combination is abbreviated
NI-1 BRI
).
These digital facilities are available from COs in many areas.
Each facility actually includes two “virtual” lines, two B-channels for carrying voice
and data, as well as a third D-channel for handling signaling and maintenance.
NOTE:
The 800 NI-BRI module is not available in Behind Switch mode.
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