DATABIT

MULTIPLEXERS; MODEMS; DIPLEXERS, ELECTRICAL POWER SUPPLIES; JACK FIELDS (I.E., ARRAYS OF JACKS); JACKFIELD ASSEMBLIES; LINE INTERFACES; ALARMS TO INDICATE MISOPERATION; OPERATING CONTROLS, PRINTED CIRCUIT CARDS, CHANNEL MONITORS, BEARER SWITCHOVER UNITS; SIGNAL CONCENTRATORS; LINE TERMINATORS; ELECTRONIC DIAGNOSTIC UNITS TO TEST DECIBEL LEVELS, VOLTAGES, CURRENTS, AND DATA INTEGRITY; MONITOR PRINTER SPEED CONVERTERS, CHANNEL MONITORS, PRINTED CIRCUIT CARD TESTERS, PROGRAMMING MODULES FOR CARD TESTERS, AND PARTS THEREFOR