Multiplex communications – Wide area network – Packet switching
Patent
1990-09-06
1991-11-05
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 941, 379 26, 379 1, 379 32, H04J 312
Patent
active
050635638
ABSTRACT:
A communication terminal is coupled to a communication network via transmitting and receiving signal lines and a switching system. The communication terminal includes a power input line coupled to the transmitting and receiving signal lines, a power sink for supplying power, a switch coupled between the power input line and the power sink, a hook switch coupled between the power input line and the power sink in parallel to the switch, a detection circuit coupled to the receiving signal line for detecting a signal on the receiving signal line, a state maintaining circuit coupled to the switch and the detection circuit for closing the switch and for maintaining the switch in a closed state by carrying out a state maintaining operation when a signal is detected by the detection circuit, and a prohibit circuit coupled to the detection circuit for prohibiting a signal detection of the detection circuit.
REFERENCES:
patent: 3934089 (1926-01-01), Stewart
patent: 4025729 (1977-05-01), Stone
patent: 4514594 (1985-04-01), Brown
patent: 4961185 (1990-10-01), Sawrada
patent: 4996526 (1991-02-01), DeLuca
Ikeda Koji
Nakayama Mikio
Fujitsu Limited
Olms Douglas W.
Samuel T.
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