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MERLIN LEGEND Communications System Release 5.0
System Manager’s Guide
555-650-118
Issue 1
June 1997
About the System
Page 2-15Modes of Operation
2
T1 Voice Operation. A “line” can be programmed through the
system, without the services of a telephone company installer, to
emulate a ground-start, loop-start, tie, or DID trunk. This type of T1
operation also gives you access to special services, such as inbound
800 or WATS service for incoming, toll-free service for voice calls.
Only this type of T1 operation is available in releases prior to Release
4.0.
NOTE:
While you can quickly and easily change the type of line that a
channel imitates, you must coordinate the change with the T1
provider so that both ends of the connection are set up for the
same type of line/trunk.
T1 Data Operation. Available in Release 4.0 and later systems, T1
data operation allows high-speed data communications over the
public switched network; this is called
T1 Switched 56 service
. It also
provides data tie “lines” to connect one MERLIN LEGEND
Communications System to another or to a DEFINITY system. A T1
data-operation “line” is a
channel
.
Primary Rate Interface (PRI) Operation. The 24 “lines” include 23
B-channels. Each B-channel can dynamically provide voice and data
services; one D-channel carries signaling information for the
B-channels.
NOTE:
Facility
is a general term that designates a communications path between
a telephone system and the telephone company central office. Specifically,
we refer to digital facilities (sometimes called
pipes
). Technically, a
trunk
connects a switch to a switch, for example, the MERLIN LEGEND
Communications System to the central office. Technically, a
line
is a
loop-start facility or a communications path that does not connect switches,
for example, an intercom line or a Centrex line. However, in actual usage,
the terms
line
and
trunk
are often applied interchangeably. In this guide, we
use
lines/trunks
and
line/trunk
to refer to facilities in general. We also use
specific terms such as
personal line
,
ground-start trunk
,
DID trunk
, and so
on. When you talk to your local telephone company central office, ask them
which terms they use for the specific facilities they connect to your system.
Modes of Operation 2
The system’s mode of operation determines the following:
■ The types of outside trunks that can be connected to the system
■ How users access outside trunks
■ The types of system operator consoles that your business can use