Cable pair to telephone number verification system

摘要: A cable pair to telephone verification system including a processor interfaced wtih pairs of subscriber lines and trunk connected automatic number identification (ANI) electronic switching means. The process is programmed select in sequence connect line which not busy the for testing. generates special access code on receipt dialing tone from non-busy pair, ANI means being responsive this send associated via trunk. also provide data read out information relating under test whether or faults are present.