Telegraphy – Systems – Cable or capacity
Patent
1991-04-26
1992-06-09
Schrfyer, Stafford D.
Telegraphy
Systems
Cable or capacity
178 63A, 178 63E, 178 69N, 333 32, H04L 2502, H04B 346, H04B 302
Patent
active
051209098
ABSTRACT:
A circuit for detecting and verifying a presence of a terminating device for a high speed data transmission line. The circuit contains a first cable detector which generates a first signal if a first cable is present. A second cable detector generates a second signal if a second cable is present. The terminating device is contained in a plurality of resistor packs, each of the which contains an extra resistor. A terminating device detector senses the extra resistor presence, thereby detecting the presence of the resistor packs. The terminating device detector generates an ALL-EQUIPPED signal and a NON-EQUIPPED signal, the ALL-EQUIPPED signal is generated when all of the plurality of resistor packs are present, the NON-EQUIPPED signal is generated when all of the plurality of resistor packs are absent. Finally, a verifier circuit receives the first signal, the second signal, the ALL-EQUIPPED signal and the NON-EQUIPPED signal. The verifier circuit verifies that if the ALL-EQUIPPED signal is present then only one of the first signal or the second signal is present, or, if the NON-EQUIPPED signal is present both the first signal and the second signal are present.
REFERENCES:
patent: 4437075 (1984-03-01), Darmouni
Earhart Tod R.
Kutz David A.
AG Communication Systems Corporation
Baca Anthony J.
Schrfyer Stafford D.
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