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Note: Hard loopback tests are intrusive and will impact service. In a hard loopback, a special loopback plug is used in order to loop the traffic from the T1 port back into the T1 port. This figure illustrates the setup for hard loopback.
Loop-start signaling is a supervisory signaling technique that provides a way to indicate on-hook and off-hook conditions in a voice network. Loop-start signaling is used primarily when the telephone set is connected to a switch.his paper discusses the signaling techniques required to control voice transmission. These signaling techniques can be placed into one of three categories; supervision, addressing, or alerting.