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MERLIN LEGEND Communications System Release 5.0
System Manager’s Guide
555-650-118
Issue 1
June 1997
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.
— 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
kilobits per second. 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.