AT&T MERLIN LEGEND Release 3.1, System Programming Manual

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Terms and Conventions Used
“Related Documents,” later in this section, provides a complete list of system
documentation together with ordering information.
In the U.S.A. only , AT&T provides a toll-free customer Helpline (1 800 628-
2888) 24 hours a day. Call the Helpline, or your AT&T representative, if you
need assistance when installing, programming, or using your system.
Terms and Conventions Used
The terms described here 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, DID trunk,
and so on. When you talk to your local telephone company central office, ask
them what 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 on the left and the new term on the right.
trunk module line/trunk module
trunk jack line/trunk jack
station extension
station jack extension jack
analog data station modem data station
digital data station Terminal Adapter data station
7500B data station Terminal Adapter data station
analog voice and analog data station analog voice and modem data
digital voice and analog data station MLX voice and modem data
analog data-only station modem data-only station
digital data-only station Terminal Adapter data-only station
digital data-only station Terminal Adapter data-only station
digital voice and digital data station MLX voice and Terminal Adapter
data station
digital voice and 7500B data station MLX voice and Terminal Adapter
data station
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System Programming