发明名称 |
Technique for reconnecting office line to key telephone system after power failure |
摘要 |
A power failure shunting office line restoring circuit includes: a first relay having an office line tip port connected to a common port for connecting the tip port of the office line to a separate emergency telephone or a key telephone office line accommodating circuit in accordance with a first relay control signal; a second relay having an office line ring port connected to a common port for connecting the ring port of the office line to the emergency telephone or the key telephone office line accommodating circuit in accordance with a second relay control signal; a controller for generating the first and second relay control signals according to a power supply state or emergency telephone use state detection signal; first and second relay drivers for driving the first and second relays in accordance with the first and second relay control signals generated by the controller, and a detector connected to the first relay for detecting the use of the emergency telephone and for outputting the use state detection signal to the controller.
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申请公布号 |
US5912957(A) |
申请公布日期 |
1999.06.15 |
申请号 |
US19960746174 |
申请日期 |
1996.11.07 |
申请人 |
SAMSUNG ELECTRONICS CO., LTD. |
发明人 |
PARK, MOON-KYEONG |
分类号 |
H04Q3/58;H04M1/723;(IPC1-7):H04M1/00 |
主分类号 |
H04Q3/58 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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