Terms And Conventions Used - AT&T MERLIN LEGEND Release 3.0 Installation Manual

Terms and Conventions Used

Terms and Conventions Used
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
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 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
trunk jack
station
station jack
analog data station
digital data station
analog voice and analog data station
digital voice and analog data station
analog data only station
digital data only station
digital voice and digital data station
MERLIN LEGEND
line/trunk module
line/trunk jack
extension
extension jack
modem data station
7500B data station
analog voice and modem data
station
MLX voice and modem data
station
modem data-only station
7500B data-only station
MLX voice and 7500B data
station
Installation xxi