Title:
SIGNAL POWER SOURCE EQUIPMENT FOR TELEPHONE
Document Type and Number:
Japanese Patent JP3430000
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To enable automatic confirmation of false failure occurrence and reduce recovery time from failure fault.
SOLUTION: A double signal power source for telephone constituted of a working/stand-by unit is equipped with a failure automatic reset circuit 110 or 210 which consists of a first counter for counting a time until a failure is automatically reset, a first latch circuit for preventing re-rest for re-failure within a specified term, and an oscillating circuit for generating clocks for the counter, and a working/stand-by automatic switching circuit 111 or 211 which consists of a second counter for counting the time from when a failure is recovered until when automatic switching is performed, a multivibrator for outputting a switching signal after an automatic reset signal is outputted, and a second latch circuit for setting a stand-by state when re-failure is not generated for a previously determined period.
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Inventors:
Yuji Kawagoe
Chuichi Aoki
Kenji Tawara
Masayuki Okai
Chuichi Aoki
Kenji Tawara
Masayuki Okai
Application Number:
JP1483598A
Publication Date:
July 28, 2003
Filing Date:
January 09, 1998
Export Citation:
Assignee:
NTT Facilities Co., Ltd.
Densei-Lambda Co., Ltd.
Densei-Lambda Co., Ltd.
International Classes:
H02M7/48; H04M3/02; H04M19/00; (IPC1-7): H02M7/48; H04M3/02; H04M19/00
Domestic Patent References:
| JP89025A | ||||
| JP6341686A | ||||
| JP8280143A |
Attorney, Agent or Firm:
Takeo Masuda
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