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Both are signaling techniques used in telecommunication.

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Posted by akumar_8181

Visit following links
en.wikipedia.org/wiki/Ground_start
en.wikipedia.org/wiki/Loop_start

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Posted by drolet_55

->Ground start is a signaling technique for telephony in which a caller gets a dial tone by momentarily grounding one side of a two-wire trunk.
->Loop start is a method of supervisory
signaling.

For details visit:WIKIPEDIA.org

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Posted by sagitraz