Title:
SYNCHRONIZING DEVICE AND SYNCHRONIZING SYSTEM
Document Type and Number:
WIPO Patent Application WO/2001/028144
Kind Code:
A1
Abstract:
A synchronizing device capable of preventing generation of a synchronous loop between SDH transmission devices including an SONET and of being synchronized with one reference clock in any case, and a system for the synchronizing device. This device comprises synchronizing means, line input/output means for inputting/outputting synchronizing signals on a line, external output means for outputting the synchronizing signal inputted to the line input/output means to the outside, external input means to which an external synchronizing signal is inputted, and opposition input means to which a synchronizing signal of an opposed device is inputted. The synchronizing means outputs the external synchronizing signal of the external input means to the line through the line input/output means when the quality of the external synchronizing signal of the external input means is identical to that of the input synchronizing signal of the line input/output means and to that of the synchronizing signal of the opposition input means.
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Inventors:
FUJII YASUO (JP)
Application Number:
PCT/JP1999/005715
Publication Date:
April 19, 2001
Filing Date:
October 15, 1999
Export Citation:
Assignee:
FUJITSU LTD (JP)
FUJII YASUO (JP)
FUJII YASUO (JP)
International Classes:
H04J3/06; H04Q11/04; (IPC1-7): H04J3/00
Foreign References:
| US5687015A | 1997-11-11 | |||
| JPH1051411A | 1998-02-20 | |||
| JPH10136000A | 1998-05-22 | |||
| JPH10271100A | 1998-10-09 | |||
| JPH11127128A | 1999-05-11 |
Attorney, Agent or Firm:
Ishida, Takashi (Ishida & Associates Toranomon 37 Mori
Building 5-1 Toranomon 3-chome Minato-ku, Tokyo, JP)
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