ADC

PRIVATE LINE TEST FACILITIES FOR PERFORMING TESTS ON COMMUNICATION SYSTEMS COMPRISING TEST MODULES, SERVICE MODULES, SIGNAL TEST MODULES, CORD REELS, POWER PANELS AND A SELECTED NUMBER OF CORD CAGE OPTIONS-NAMELY, OSCILLATOR OPTIONS, AMPLIFIER OPTIONS, ATTENUATOR OPTIONS, TERM SET OPTIONS, REPEAT COIL OPTIONS, RINGDOWN CONVERTER OPTIONS, SIGNAL RELAY OPTIONS, BLANK PLUG-IN CORD OPTIONS, MONITOR SPEAKER OPTIONS, TRANSMISSION PAD CONTROL OPTIONS, AUTOMATIC LEVEL CONTROL OPTIONS, BRIDGING TRANSFORMER OPTIONS, PULSE GENERATOR OPTIONS, OUTPULSER OPTIONS, LOOP BACK OPTIONS AND TEST SHOE CONTROL OPTIONS, SOLD AS A MODULAR UNIT; ELECTRICAL APPARATUS USED AS COMPONENTS OF PRIVATE LINE TEST FACILITIES FOR PERFORMING TESTS ON COMMUNICATION SYSTEMS-NAMELY, TEST MODULES, SERVICE MODULES, SIGNAL TEST MODULES, CORD REELS, POWER PANELS AND CORD CAGE OPTIONS-NAMELY, OSCILLATOR OPTIONS, AMPLIFIER OPTIONS, ATTENUATOR OPTIONS, TERM SET OPTIONS, REPEAT COIL OPTIONS, RINGDOWN CONVERTER OPTIONS, SIGNAL RELAY OPTIONS, BLANK PLUG-IN CORD OPTIONS, MONITOR SPEAKER OPTIONS, TRANSMISSION PAD CONTROL OPTIONS, AUTOMATIC LEVEL CONTROL OPTIONS, BRIDGING TRANSFORMER OPTIONS, PULSE GENERATOR OPTIONS, OUTPULSER OPTIONS, LOOP BACK OPTIONS AND TEST SHOE CONTROL OPTIONS; AND DIRECT CURRENT AMMETERS