| Ground Start Trunk |
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GROUND START TRUNK: A way of signaling on subscriber trunks in which one side of the two wire trunk (typically the "Ring" conductor of the Tip and Ring) is momentarily grounded to get dialtone. There are two types of switched trunks one can typically lease from a local phone company -- ground start and loop start. PBXs work best on ground start trunks, though many will work -- albeit intermittently -- on both types. Normal single line phones and key systems typically work on loop start lines. You must be careful to order the correct type of trunk from your local phone company and correctly install your telephone system at your end -- so that they both match. Technically, a ground start trunk initiates an outgoing trunk seizure by applying a momentary connection to ground (maximum local resistance of 550 ohms) to the tip conductor. See Loop Start Trunk . |
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