AT&T 555-600-736 User Manual
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Cost
Unfortunately, the most common reason for using loop-start trunks is the least valid. This reason is cost.
If a customer currently has a key system, service at that location is undoubtedly supplied by loop-start lines.
Converting the lines to ground-start trunks may involve a longer installation intend, and may incur
Converting the lines to ground-start trunks may involve a longer installation intend, and may incur
additional charges from the operating company. As a result, many loop-start lines are simply re-used as
loop-start trunks when the key system is replaced by a PBX.
However, if a MERLIN LEGEND CS is used, the customer has the flexibility of using either Loop Start or
Ground Start lines/trunks. This advantage not only eliminates out-of-service conditions, as would be
required if new replacement lines had to be installed, but can be a major cost-break by using the more
economical Loop Start Modules. Also, the combined GS/LS board is a key advantage of the LEGEND
system in facilitating the coordination with the telephone company in converting from LS to GS. It’s not
required if new replacement lines had to be installed, but can be a major cost-break by using the more
economical Loop Start Modules. Also, the combined GS/LS board is a key advantage of the LEGEND
system in facilitating the coordination with the telephone company in converting from LS to GS. It’s not
necessary to provide a loop-start module, and then have to replace it with a ground-start board should the
lines be converted.
lines be converted.