Abstract: A cellular backup system is provided for a standard security alarm network, so that upon the inoperativeness of the telephone land line, automatic switch over to the cellular system is achieved, so that a digital communicator or teleophone tape dialer may still transmit its distress call to a central alarm station, via the cellular system. A line fault monitor is provided which automatically detects the outage of the land-based telephone system which, in turn, provides an output signal to a latching relay which causes the activation of a pair of switching relays to automatically switch the connection of the alarm communicator from the DB-8 cord of the land-based system to a cellular interface coupled to a conventional cellular transceive of a cellular system. The switching relays are latched in the state connecting the alarm communicator to the cellular backup system and held in such a state, regardless of the state of the land-based system, as long as a manual rest switch has not been used.

Abstract: A cellular backup system is provided for a standard security alarm network, so that upon the inoperativeness of the telephone land line, automatic switch over to the cellular system is achieved, so that a digital communicator or telephone tape dialer may still transmit its distress call to a central alarm station, via the cellular system. A line fault monitor is provided which automatically detects the outage of the land-based telephone system which, in turn, provides an output signal to a latching relay which causes the activation of a pair of switching relays to automatically switch the connection of the alarm communicator from the DB-8 cord of the land-based system to a cellular interface coupled to a conventional cellular transceiver of a cellular system. The switching relays are latched in the state connecting the alarm communicator to the cellular backup system and held in such a state, regardless of the state of the land-based system, as long as a manual rest switch has not been used.

Abstract: An adapter for a cellular mobile phone unit which converts the unit to permit simultaneous insertion of a plurality of telephone numbers. A main circuit board is coupled to a microprocessor of the unit, which board includes a plurality of number assignment modules, or NAM's (ROM's), each NAM having its own unique telephone number code. The NAM's are connected such that fifteen of the sixteen pin-connections of each NAM are correspondingly and respectively connected in series, for coupling to the fifteen pin-connections of a plug at one end of a ribbon cable, the other end of the ribbon cable being coupled to the microprocessor of the unit via the conventional NAM connection therefor. Each remaining pin of each NAM, which is not connected in series, is connected to a unique stop of a multi-position switch, so that a selected one of the NAM's may be coupled to the microprocessor in order to change the telephone number from one to another.

Abstract: An adapter for a cellular mobile phone unit which converts the unit to include a plurality of telephone numbers. A main circuit board is coupled to a microprocessor of the unit, which board includes a plurality of number assignment modules, or NAM's (ROM's), each NAM having its own unique telephone number code. The NAM's are connected such that fifteen of the sixteen pin-connections of each NAM are correspondingly and respectively connected in series, for coupling to the fifteen pin-connections of a plug at one end of a ribbon cable, the other end of the ribbon cable being coupled to the microprocessor of the unit via the conventional NAM connection therefor. Each remaining pin of each NAM, which is not connected in series, is connected to a unique stop of a multi-position switch, so that a selected one of the NAM's may be coupled to the microprocessor in order to change the telephone number from one to another.