MERLIN LEGEND Communications System Release 6.1
Maintenance and Troubleshooting
555-661-140
Issue 1
August 1998
Page xxii
How to Use This Book
Refer to the following documentation for additional information:
■
Equipment and Operations Reference
provides detailed information on
system hardware, telephones, and other equipment (not updated since
Release 3.0).
■
Feature Reference
provides details on the features of the
communications system.
■
System Planning
provides procedures and forms for planning a system
for installation.
■
System Programming
gives procedural instructions for programming
system features.
■ Users’ guides and Operators’ Guides give procedural instructions for
programming and using telephone features.
“Related Documents,” later in this section, provides a complete list of system
documentation together with ordering information.
In this document, the terms in the following list are used in preference to other,
equally acceptable terms for describing communications systems.
Lines, Trunks and Facilities
Facility
is a general term that designates a communications path between a
telephone system and the telephone company central office. 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 two 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 book, we use
line/trunk
and
lines/trunks
to refer to facilities in general. Specifically, we refer to
digital facilities
. We also use terms such as personal line, ground-start trunk,
Direct Inward Dialing (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.
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