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MERLIN LEGENDCommunications System Release 6.1
System Planning
555-661-112
Issue 1
August 1998
Data Communications
Page 5-27Assigning Lines/Trunks to Data and Video Stations
5
Assigning Lines/Trunks to Data and
Video Stations 5
The following types of outside lines/trunks are used to make and receive data
calls to and from data stations outside of the system:
■ Loop-Start (LS). This is the standard line/trunk for homes and small
businesses, and can be used to communicate with outside modem data
stations. Video calls are not made over loop-start lines/trunks. Loop-start
lines/trunks are the least expensive lines/trunks in some areas but have the
following disadvantages:
— They do not protect against glare, a condition that occurs when an
outside call is made at the same time that an incoming call arrives
on the same line/trunk.
— They may not provide reliable far-end disconnect for toll restriction.
!
SecurityAlert:
Toll fraud can occur when loop-start lines/trunks are used with unreliable
disconnect. If the calling party stays on the line after the called party hangs
up, the central office returns a dial tone at the conclusion of the call enabling
the caller to place another call as if it were being placed from your company.
■ Ground-Start (GS). This line/trunk is preferred for communication with
outside modem data stations. Ground-start lines/trunks provide improved
signaling and reliable far-end disconnect for secure toll restriction. Video
calls are not made over ground-start lines/trunks.
The following kinds of outside ground-start or loop-start lines/trunks can be used
for data communications:
— Basic lines/trunks
— Wide area telecommunications service (WATS)
— 800 service (inbound WATS)
— Foreign exchange (FX)
Ground-start/loop-start lines/trunks connect to ground-start/loop-start jacks on the
following types of modules in the control unit:
— 800 GS/LS
— 400 GS/LS/TTR
— 408 (LS lines/trunks only)
— 408 GS/LS
— 400 (LS lines/trunks only)
— 800 (LS lines/trunks only)
— 408 GS/LS-MLX
— 800 GS/LS-ID