WO1995024800A3 - Hierarchical synchronization method - Google Patents

Hierarchical synchronization method Download PDF

Info

Publication number
WO1995024800A3
WO1995024800A3 PCT/FI1995/000111 FI9500111W WO9524800A3 WO 1995024800 A3 WO1995024800 A3 WO 1995024800A3 FI 9500111 W FI9500111 W FI 9500111W WO 9524800 A3 WO9524800 A3 WO 9524800A3
Authority
WO
WIPO (PCT)
Prior art keywords
synchronization
state
forced
timing
measuring
Prior art date
Application number
PCT/FI1995/000111
Other languages
French (fr)
Other versions
WO1995024800A2 (en
Inventor
Jukka Kainulainen
Original Assignee
Nokia Telecommunications Oy
Jukka Kainulainen
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Telecommunications Oy, Jukka Kainulainen filed Critical Nokia Telecommunications Oy
Priority to AU18138/95A priority Critical patent/AU1813895A/en
Priority to EP95909808A priority patent/EP0748547B1/en
Priority to US08/693,163 priority patent/US5838659A/en
Priority to DE69529457T priority patent/DE69529457D1/en
Priority to JP7523104A priority patent/JPH09510059A/en
Publication of WO1995024800A2 publication Critical patent/WO1995024800A2/en
Publication of WO1995024800A3 publication Critical patent/WO1995024800A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
    • H04J3/0647—Synchronisation among TDM nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0679—Clock or time synchronisation in a network by determining clock distribution path in a network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0016—Arrangements providing connection between exchanges

Abstract

The invention relates to a hierarchical synchronization method for a telecommunications system employing message-based synchronization and comprising a plurality of nodes interconnected by transmission lines (A, B). In order to speed up the network synchronization and to prevent synchronization from getting in disorder, (a) in a change situation the node enters into a state of forced timing in which it has selected a synchronization signature received from a neighbouring node and synchronized itself with the clock frequency of a signal from the neighbouring node, whereupon this transition starts timer means for the forced state measuring a time period after the expiry of which the node enters again into the state of normal timing, whereupon (b) when the selected synchronization signature changes in said state of forced timing, the new signature is accepted and the measuring of the time period of the forced state is restarted, and (c) when the quality of the signal corresponding to the selected synchronization signature becomes inadequate for synchronization, the node enters into a predetermined standard state, preferably the state of internal timing, in order to prevent the selection of faulty synchronization signatures, and restarts the measuring of the forced state.
PCT/FI1995/000111 1994-03-01 1995-02-28 Hierarchical synchronization method WO1995024800A2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AU18138/95A AU1813895A (en) 1994-03-01 1995-02-28 Hierarchical synchronization method
EP95909808A EP0748547B1 (en) 1994-03-01 1995-02-28 Hierarchical synchronization method
US08/693,163 US5838659A (en) 1994-03-01 1995-02-28 Hierarchical synchronization method
DE69529457T DE69529457D1 (en) 1994-03-01 1995-02-28 HIERARCHICAL SYNCHRONIZATION PROCEDURE
JP7523104A JPH09510059A (en) 1994-03-01 1995-02-28 Hierarchical synchronization method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI940978A FI95978C (en) 1994-03-01 1994-03-01 Hierarchical synchronization method
FI940978 1994-03-01

Publications (2)

Publication Number Publication Date
WO1995024800A2 WO1995024800A2 (en) 1995-09-14
WO1995024800A3 true WO1995024800A3 (en) 1995-10-26

Family

ID=8540231

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1995/000111 WO1995024800A2 (en) 1994-03-01 1995-02-28 Hierarchical synchronization method

Country Status (7)

Country Link
US (1) US5838659A (en)
EP (1) EP0748547B1 (en)
JP (1) JPH09510059A (en)
AU (1) AU1813895A (en)
DE (1) DE69529457D1 (en)
FI (1) FI95978C (en)
WO (1) WO1995024800A2 (en)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6256740B1 (en) * 1998-02-06 2001-07-03 Ncr Corporation Name service for multinode system segmented into I/O and compute nodes, generating guid at I/O node and exporting guid to compute nodes via interconnect fabric
US6148349A (en) * 1998-02-06 2000-11-14 Ncr Corporation Dynamic and consistent naming of fabric attached storage by a file system on a compute node storing information mapping API system I/O calls for data objects with a globally unique identification
US6247077B1 (en) 1998-02-06 2001-06-12 Ncr Corporation Highly-scalable parallel processing computer system architecture
US6714563B1 (en) * 1999-04-26 2004-03-30 Cisco Technology, Inc. Network clock synchronization scheme
US6745240B1 (en) 1999-11-15 2004-06-01 Ncr Corporation Method and apparatus for configuring massively parallel systems
US6412002B1 (en) 1999-11-15 2002-06-25 Ncr Corporation Method and apparatus for selecting nodes in configuring massively parallel systems
US6418526B1 (en) 1999-11-15 2002-07-09 Ncr Corporation Method and apparatus for synchronizing nodes in massively parallel systems
US6519697B1 (en) 1999-11-15 2003-02-11 Ncr Corporation Method and apparatus for coordinating the configuration of massively parallel systems
US6714589B1 (en) * 2000-01-04 2004-03-30 Legerity, Inc. Communication device with primitive synchronization signal
US6874037B1 (en) * 2000-06-19 2005-03-29 Sony Corporation Method and apparatus for synchronizing device information
US8423674B2 (en) * 2001-06-02 2013-04-16 Ericsson Ab Method and apparatus for process sync restart
US7505450B2 (en) * 2005-03-23 2009-03-17 Cisco Technology, Inc. Configuration of failure and acquire timeouts to facilitate recovery from failures in hierarchical mesh networks
US7523365B2 (en) * 2005-12-19 2009-04-21 International Business Machines Corporation Dynamic determination of signal quality in a digital system
TW200743028A (en) * 2006-05-12 2007-11-16 Benq Corp State synchronization apparatuses and methods
KR100824409B1 (en) 2006-12-07 2008-04-23 한국전자통신연구원 Data synchronization apparatus and method based on packet
US20130100947A9 (en) * 2007-07-09 2013-04-25 Qualcomm Incorporated Methods and apparatus for timing synchronization using multiple different timing signal sources
JP5458904B2 (en) * 2010-01-20 2014-04-02 富士電機株式会社 Communication system synchronization method, communication system, master station

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987000369A1 (en) * 1985-07-01 1987-01-15 Bicc Public Limited Company Data network synchronisation
US4837850A (en) * 1986-09-03 1989-06-06 U.S. Philips Corp. Hierarchic synchronization method and circuit arrangement for exchanges of a mesh telecommunication network
WO1994011964A1 (en) * 1992-11-09 1994-05-26 Nokia Telecommunications Oy Hierarchical synchronization method

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2986723A (en) * 1960-02-26 1961-05-30 Bell Telephone Labor Inc Synchronization in a system of interconnected units
FR2670345B1 (en) * 1990-12-11 1994-09-30 Alcatel Business Systems METHOD FOR ENSURING THE PERMANENCE OF THE SYNCHRONIZATION OF THE NODES OF A PRIVATE TELECOMMUNICATIONS NETWORK ON THE BEST AVAILABLE CLOCKS AND CORRESPONDING NETWORK.
EP0553360B1 (en) * 1991-08-19 1999-02-03 Fujitsu Limited Method for synchronizing synchronous data communication network, and communication device used in the synchronous data communication network
US5577075A (en) * 1991-09-26 1996-11-19 Ipc Information Systems, Inc. Distributed clocking system
FI92126C (en) * 1992-11-09 1994-09-26 Nokia Telecommunications Oy Network arrangement
FI91689C (en) * 1992-11-09 1994-07-25 Nokia Telecommunications Oy Hierarchical synchronization method and communication system using message-based synchronization
FI95977C (en) * 1994-02-25 1996-04-10 Nokia Telecommunications Oy Network arrangement

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987000369A1 (en) * 1985-07-01 1987-01-15 Bicc Public Limited Company Data network synchronisation
US4837850A (en) * 1986-09-03 1989-06-06 U.S. Philips Corp. Hierarchic synchronization method and circuit arrangement for exchanges of a mesh telecommunication network
WO1994011964A1 (en) * 1992-11-09 1994-05-26 Nokia Telecommunications Oy Hierarchical synchronization method

Also Published As

Publication number Publication date
FI95978C (en) 1996-04-10
JPH09510059A (en) 1997-10-07
EP0748547A1 (en) 1996-12-18
FI940978A0 (en) 1994-03-01
DE69529457D1 (en) 2003-02-27
EP0748547B1 (en) 2003-01-22
US5838659A (en) 1998-11-17
FI95978B (en) 1995-12-29
AU1813895A (en) 1995-09-25
FI940978A (en) 1995-09-02
WO1995024800A2 (en) 1995-09-14

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