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48 vdc, 60950, alarms management, backup phone system, battery backup, battery back-up, battery module, bypass, bypass unit, central office emulator, central office simulator, channel service unit, chime page unit, code call equipment, code call system, co emulator, co simulator, cpe, cpe ds1, dc battery backup, dc battery back-up, dc power supply, dc ups, did bypass unit, digital bypass unit, digital pft, dsl emulator, dsl simulator, e1, e1 euro isdn, gordon, gordon kapes, ground to loop start conversion, ground start to loop start conversion, gr303 emulator, gr303 simulator, isdn bypass unit, isdn call generator, isdn data capture, isdn pri, kapes, loop to ground start conversion, loop start to ground start conversion, network ds1, network emulator, network simulator, ni2 isdn emulator, ni2 isdn simulator, overhead paging, page adapter, page controller, paging systems, pbx disaster recovery, pbx power supply, pft, power failure, power failure transfer, power supplies, power supply, power supply battery backup, qsig, rbs, ring detector, site monitor, t1 bypass unit, t1 emulator, t1 rbs, t1 robbed bit, t1 simulator, telecom interface, telecom power supply, telephone page adapter, telephone power failure transfer, telephone ring detector, telephony simulator, tone generator, trunk bypass, uninterruptible power supply, universal transfer unit, voice page, voice paging, zone page
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