Multiplex communications – Wide area network – Packet switching
Patent
1983-10-21
1987-12-01
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
34087002, 34082563, 379107, H04J 316, G08B 2300
Patent
active
047109190
ABSTRACT:
A remote meter reading system employing a plurality of multiplexers coupled between the telephone central office and remote interrogatable utility data sources. A number of lines are connected to a single data channel through a plurality of multiplexers. An interrogation signal source is connected to the multiplexer for sending controllable level interrogation signals to the data sources under the control of a microprocessor. The level of interrogation signal which produces a response from each different data source is stored. Upon failure to evoke a response from the highest level of interrogation signal causes that line to be recorded in memory as defective. The number of OFF-HOOK conditions encountered in a predetermined period is recorded and any excess of a predetermined value deleted as a line trouble condition. Signalling in the preferred embodiment is via pulse width modulated signals. In the alternate embodiment, dual tone signalling is employed.
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Cosgrove John
Oliver Stewart W.
International Teldata Corporation
Kuntz Curtis
Olms Douglas W.
Wagner John E.
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