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MERLIN LEGENDCommunications System Release 6.1
System Planning
555-661-112
Issue 1
August 1998
About This Book
Page xxxixTerms and Conventions Used
Terms and Conventions Used 0
The terms described here are used in preference to other, equally acceptable
terms for describing communications systems.
Lines, Trunks, and Facilities 0
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 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. Specifically, we refer to
digital
facilities
. We also use specific
terms such as
personal line
,
ground-start trunk
,
DID trunk
, and so on. When you
talk to personnel at your local telephone company central office, ask about the
terms they use for the specific facilities they connect to your system.
Some older terms have been replaced with newer terms. The following list shows
the old term and the new term.
Old New
trunk module line/trunk module
trunk jack line/trunk jack
station extension
station jack extension jack
analog data station modem data workstation
7500B data station ISDN terminal adapter data workstation
analog voice and data station analog voice and modem data
workstation
digital voice and analog data station MLX voice and modem data workstation
analog data-only station modem data-only workstation
7500B data-only station ISDN terminal adapter data-only
workstation
MLX voice and 7500B data station MLX voice and ISDN terminal adapter
data workstation