Ground-Start Signaling

A signaling technique typically used between PBXs and central office switches. Ground start signaling momentarily grounds one side (the Ring side is usually the grounded side) of the circuit, sending an immediate signal to the central office switch in order to start (seize) the trunk and get the dial tone.

Local telephone companies typically provide two types of dial tone switched trunks — ground start and loop start. Most pay-phones use ground start signaling.

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