Digital option select system

Details Digital option select system Digital option select system

1991-05-06

1994-04-05

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

Having measuring, testing, or monitoring of system or part

455 88, 455 89, 34082557, H04B 1702, H04B 140

Patent

active

053013603

ABSTRACT:
A communication device (10) comprises a coupler (19) for coupling an external device (30) to the communication device, and controller (16) for controlling the communication device., The controller has at least first and second terminals (22 and 23) for receiving digital numbers from the external device, each digital number representing a mode of operation for the communication device. The controller also includes an apparatus for transmitting a test pulse to the external device, and an apparatus for receiving a response pulse in response to the test pulse. The response pulse has predetermined direction, duration and polarity indicating a mode of operation for the communication device.

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patent: 5125107 (1992-06-01), Herold et al.
patent: 5164652 (1992-11-01), Johnson et al.

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