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Non-break change-over device for redundancy system in information transmission systems

  • US 6,510,134 B1
  • Filed: 03/15/1999
  • Issued: 01/21/2003
  • Est. Priority Date: 04/15/1998
  • Status: Expired due to Fees
First Claim
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1. A non-break change-over device for complementarily switching first and second information transmission systems between an active state and a standby state and for constituting a redundancy system together with both of the information transmission systems having the same functions and handling information in units of frames defined by frame pulses corresponding to the information transmission systems, the frame pulses having the same period, the non-break change-over device comprising:

  • a monitoring section monitoring each of the information transmission systems and generating a switching instruction signal to switch one of the information transmission systems, functioning as a standby system, to an active system when a necessity occurs for switching the information transmission systems between the active state and standby state, first and second internal switching circuits respectively corresponding to the first and second information transmission systems, the first internal switching circuit being operable upon receiving the switching signal from the monitoring section when the first information transmission system is in the standby state, to generate an internal switching signal and output the internal switching signal in synchronization with timing pulses each having the same period as the frame pulse corresponding to the first information transmission system, but being out of phase with the frame pulse in order to cause the second information system to be switched to the active state, the second internal switching circuit being operable upon receiving the switching instruction signal from the monitoring section when the second information transmission system is in the standby state, to generate the internal switching signal and output the internal switching signal in synchronization with timing pulses each having the same period as the frame pulse corresponding to the second information transmission system, but being out of phase with the frame pulse in order to cause the first information transmission system to be switched to the active state, first and second external switching circuits, respectively corresponding to the first and second information transmission systems, the first external switching circuit being operable upon receiving the switching signal from the monitoring section when the first information transmission system is in the standby state to output a switching request signal to the second internal switching circuit in order to cause the second information transmission system to operate as the standby system, the second external switching circuit being operable upon receiving the switching signal from the monitoring section the second information transmission system is in the standby state to output a switching request signal to the first internal switching circuit in order to cause the first information transmission system to operate as the standby system, and first and second delay circuits respectively corresponding to the first and second information transmission systems, the first delay circuit providing a time-delay to the switching request signal to be fed from the first external switching circuit to the second internal switching circuit and the second delay circuit providing a time-delay to the switching request signal to be fed from the second external switching circuit to the first internal switching circuit, in order to perform switching operations between the standby state and active state in the first and second information transmission systems during the same frame of pulses corresponding to the first and second information transmission systems.

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