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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
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
necessary to provide a loop-start module, and then have to replace it with a ground-start board should the
lines be converted.