Instruction manual

MERLIN LEGEND Communications System Release 5.0
Maintenance and Troubleshooting
555-650-140
Issue 1
June 1997
Glossary
Page GL-25
line coding Pattern that data assumes as it is transmitted over a
communications channel.
line compensation Adjustment for the amount of cable loss in decibels
(dB), based on the length of cable between a 100D
module and a channel service unit (CSU) or other
far-end connection point.
line/trunk Refers to inside system lines and outside trunks in
general terms.
See also line and trunk.
line/trunk jack Physical interface on a module in the control unit for
connecting an outside trunk to the communications
system. Also called “trunk jack.”
line/trunk and
extension module
Module on which the jacks for connecting central
office lines/trunks and/or the jacks for connecting the
extensions are located.
local host com-
puter access
A method for connecting an extension jack to an
on-site computer for data-only calls through a
modem or data module.
local loop
See access line .
logical ID Unique numeric identifier for each extension and
line/trunk jack in the system control unit.
loop-start trunk Trunk on which a closure between the tip and ring
leads is used to originate or answer a call. High-volt-
age 20-Hz AC ringing current from the central office
signals an incoming call.