Communications: electrical – Continuously variable indicating – With meter reading
Patent
1995-11-16
1998-07-28
Horabik, Michael
Communications: electrical
Continuously variable indicating
With meter reading
34082507, 34082534, 34082522, 370352, 370469, 395186, 39520058, 39520055, H04B 700, H04J 300
Patent
active
057867704
ABSTRACT:
A message handler for the transmission and/or reception of message packets in one or both directions between a telecommunications station and a controller for one or more telecommunications stations, has a number of control layers including a transmitter and/or receiver control layer for the transmission and/or reception of strings of characters between the controller and the telecommunications stations via a transmission line, a call control layer, above the transmitter/receiver layer, for establishing and maintaining connection with the transmission line when message packet transmission is required and a security layer, above the call control layer, for the exchange of authentication messages between the controller and the telecommunications stations to verify the identity of elements of the telecommunications station during the establishment of a call connection. A simulator for testing and/or monitoring purposes can be connection to the transmission line between a telecommunications station and the controller. The simulator includes a message handler of the type described above for intercepting messages sent on the transmission line and a protocol monitor for monitoring intercepted messages from the transmission line and routing the messages to their original destination.
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Beaulieu Yonel
DSC Communications Corporation
Horabik Michael
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