H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
344/24
H04Q 3/00 (2006.01) H04M 19/08 (2006.01) H04Q 11/04 (2006.01)
Patent
CA 2025140
ABSTRACT OF THE DISCLOSURE 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.
Ikeda Koji
Nakayama Mikio
Fetherstonhaugh & Co.
Fujitsu Limited
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