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DEFINITIONS2-WIRE
4W4-WIRE
ACALTERNATING CURRENT
CHCHANNEL
DS1DIGITAL SIGNAL 1 (=T1), 24 DS0 CHANNELS
E&MEAR AND MOUTH SIGNALING
E1A EUROPEAN DIGITAL TRANSMISSION FORMAT EQUIVALENT TO THE N. AMERICAN T-CARRIER SYSTEM
FXOFOREIGN EXCHANGE OFFICE, RJ-11 CONNECTION TO PSTN CO OR PBX INTERFACE
FXSFOREIGN EXCHANGE STATION, RJ-11 CONNECTION TO BASIC TELEPHONE EQUIPMENT
NTUNETWORK TERMINATION UNIT
RSREMOTE SUBSCRIBER
T1DIGITAL SIGNAL 1 (DS1, ALSO CALLED T1) IS A T-CARRIER SIGNAL DEVISED BY BELL LABS