Source: https://patents.google.com/patent/JPH02165737A/en
Timestamp: 2020-08-07 15:11:55
Document Index: 240932390

Matched Legal Cases: ['art 15', 'art 12', 'art 21', 'art 21', 'art 17', 'art 16', 'art 26', 'art 16']

JPH02165737A - Communication line switching system - Google Patents
Communication line switching system
JPH02165737A
JPH02165737A JP31955488A JP31955488A JPH02165737A JP H02165737 A JPH02165737 A JP H02165737A JP 31955488 A JP31955488 A JP 31955488A JP 31955488 A JP31955488 A JP 31955488A JP H02165737 A JPH02165737 A JP H02165737A
JP31955488A
JP2591128B2 (en
1988-12-20 Application filed by Nec Corp filed Critical Nec Corp
1988-12-20 Priority to JP31955488A priority Critical patent/JP2591128B2/en
1990-06-26 Publication of JPH02165737A publication Critical patent/JPH02165737A/en
1997-03-19 Publication of JP2591128B2 publication Critical patent/JP2591128B2/en
PURPOSE: To eliminate the need for the measurement of the quality of a second line or the switching of a communication line by a person by visiting a place where a modem is installed by returning the communication line from a first line to the second line after automatically confirming the recovery of the second line and the quality of the second line by the modem.
CONSTITUTION: A level measuring part 15 measures the level of a specific signal from a tone transmission part 12 and transmits it to a control part 21, and the control part 21 calculates an S/N value from a measured level, and transmits the value from a command/response transmission and reception part 17. A command/response transmission and reception part 16 receiving the S/N value compares it with the S/N value set at a setting part 26, and when it exceeds a preset value, the command/response transmission and reception part 16 is connected to a private line 4 by controlling a switch 27. In such a way, when the private line is recovered and the quality of the line is kept constant, the line can be switched from a public line to the private line.
JP31955488A 1988-12-20 1988-12-20 Communication line switching method Expired - Lifetime JP2591128B2 (en)
JP31955488A JP2591128B2 (en) 1988-12-20 1988-12-20 Communication line switching method
US07/453,891 US5138609A (en) 1988-12-20 1989-12-20 Automatic channel switching from fallback channels to regular channels
JPH02165737A true JPH02165737A (en) 1990-06-26
JP2591128B2 JP2591128B2 (en) 1997-03-19
JP31955488A Expired - Lifetime JP2591128B2 (en) 1988-12-20 1988-12-20 Communication line switching method
JP2513919B2 (en) * 1990-09-05 1996-07-10 日立コンピュータエンジニアリング株式会社 Reconfiguration function stop prevention method for configuration controller
JP2558012B2 (en) * 1990-11-27 1996-11-27 富士通株式会社 Communication line backup method
ES2091455T3 (en) * 1991-01-23 1996-11-01 Siemens Ag Control procedure of a switching installation.
JP2758777B2 (en) * 1992-04-27 1998-05-28 日本電気株式会社 Automatic line backup device
EP0142138B1 (en) * 1983-11-11 1988-10-26 Fujitsu Limited Protection switching system for carrier transmission line
1988-12-20 JP JP31955488A patent/JP2591128B2/en not_active Expired - Lifetime
1989-12-20 US US07/453,891 patent/US5138609A/en not_active Expired - Fee Related
JP2591128B2 (en) 1997-03-19
US5138609A (en) 1992-08-11
CA2088720A1 (en) 1993-09-19 Power control method for use in a communication system
JPS61287808A (en) 1986-12-18 Suspension control device for vehicle
EP0338654A3 (en) 1990-12-12 Method and apparatus for controlling communication by a modem over a telephone line
JPS6484933A (en) 1989-03-30 Receiver
JPH0335625A (en) 1991-02-15 Method for controlling transmission power in mobile communication system
HK1031280A1 (en) 2005-01-07 Method and apparatus for increasing receiver immunity to interference.
JPS5815356A (en) 1983-01-28 Control system for power supply of data communicating device
JPH02241235A (en) 1990-09-25 Radio telephone system
JPS54106113A (en) 1979-08-20 Facsimile transmission device
JPH01163552A (en) 1989-06-27 Method of displaying time of bathtub hot water supply device
JPH0456431A (en) 1992-02-24 Feedback control optical communication equipment
JPS57160258A (en) 1982-10-02 Circuit switching device