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Title:
REDUNDANT SWITCHING CONTROL SYSTEM, METHOD AND PROGRAM
Document Type and Number:
Japanese Patent JP2009267953
Kind Code:
A
Abstract:

To avoid loss of synchronization with a counter device by speedily synchronizing a clock to a reserve system, the clock being used by an active system uses up to the moment when a switching event occurs in redundant configuration.

The redundant switching control system includes: a plurality of active systems; at least one or more reserve systems each accommodating a reception line being connected with each of counter devices that the active systems accommodate, and including a reception line selecting means for selecting a connection of any one reception lines, and a clock synchronizing means for extracting a clock at normal time from the reception line selected by the reception line selecting means and synchronizing the clock; and a redundant switching control means for instructing the reception line selecting means to select a switching destination line when a switching event occurs.


Inventors:
MORITA KAITARO
ISHIBASHI KENICHI
FUKAYA HITOSHI
Application Number:
JP2008117451A
Publication Date:
November 12, 2009
Filing Date:
April 28, 2008
Export Citation:
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Assignee:
OKI ELECTRIC IND CO LTD
International Classes:
H04L69/40; G06F1/06; H04J3/00; H04L7/00
Domestic Patent References:
JP2003198432A2003-07-11
JPH08331105A1996-12-13
JPH0865262A1996-03-08
JP2003032285A2003-01-31
JPH06120977A1994-04-28
JPH09298530A1997-11-18
JP2005057461A2005-03-03
JP2000134137A2000-05-12
JP2005341289A2005-12-08
JP2003198432A2003-07-11
JPH08331105A1996-12-13
JPH0865262A1996-03-08
JP2003032285A2003-01-31
JPH06120977A1994-04-28
JPH09298530A1997-11-18
JP2005057461A2005-03-03
Attorney, Agent or Firm:
Nobuyuki Kudo



 
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