WO1997033396A3 - Network synchronisation - Google Patents

Network synchronisation Download PDF

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Publication number
WO1997033396A3
WO1997033396A3 PCT/GB1997/000595 GB9700595W WO9733396A3 WO 1997033396 A3 WO1997033396 A3 WO 1997033396A3 GB 9700595 W GB9700595 W GB 9700595W WO 9733396 A3 WO9733396 A3 WO 9733396A3
Authority
WO
WIPO (PCT)
Prior art keywords
network
trail
elements
information
clock
Prior art date
Application number
PCT/GB1997/000595
Other languages
French (fr)
Other versions
WO1997033396A2 (en
Inventor
Ali Jamasebi-Jahomi
Peter John Timothy Wotton
Original Assignee
Northern Telecom Ltd
Jamasebi Jahomi Ali
Peter John Timothy Wotton
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 Northern Telecom Ltd, Jamasebi Jahomi Ali, Peter John Timothy Wotton filed Critical Northern Telecom Ltd
Publication of WO1997033396A2 publication Critical patent/WO1997033396A2/en
Publication of WO1997033396A3 publication Critical patent/WO1997033396A3/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
    • H04J3/0679—Clock or time synchronisation in a network by determining clock distribution path in a network
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

A method of synchronising an element in a network, by selecting from a plurality of clock references, the clock references being transmitted from respective neighbouring network elements, wherein trail information relating to the trail of each clock reference through elements in the network, is determined by the respective neighbouring elements, and wherein the selection is made on the basis of at least the trail information. The trail information may comprise a count of network elements in the trail through the network followed by each clock reference. The trail information may be transmitted using the network management channels or as part of synchronisation status message information in an SDH system.
PCT/GB1997/000595 1996-03-08 1997-03-05 Network synchronisation WO1997033396A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9605013.3 1996-03-08
GBGB9605013.3A GB9605013D0 (en) 1996-03-08 1996-03-08 Network synchronisation

Publications (2)

Publication Number Publication Date
WO1997033396A2 WO1997033396A2 (en) 1997-09-12
WO1997033396A3 true WO1997033396A3 (en) 1997-10-09

Family

ID=10790123

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1997/000595 WO1997033396A2 (en) 1996-03-08 1997-03-05 Network synchronisation

Country Status (2)

Country Link
GB (1) GB9605013D0 (en)
WO (1) WO1997033396A2 (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI103307B1 (en) 1997-02-11 1999-05-31 Nokia Telecommunications Oy Communication network synchronization
JP3052922B2 (en) * 1998-02-18 2000-06-19 日本電気株式会社 COMMUNICATION TERMINAL DEVICE, ITS OPERATION CLOCK SELECTION METHOD, AND RECORDING MEDIUM RECORDING ITS CONTROL PROGRAM
GB2341749A (en) * 1998-09-19 2000-03-22 Nokia Telecommunications Oy Digital network synchronisation
AU4791900A (en) * 1999-05-06 2000-11-21 Net Insight Ab Synchronization method and apparatus
GB9930132D0 (en) 1999-12-22 2000-02-09 Ericsson Telefon Ab L M Telecommunication network synchronisation
EP1583266A3 (en) * 2004-03-31 2007-07-11 Tellabs Denmark A/S Synchronisation for TDM services in packet networks
JP4731623B2 (en) * 2007-03-29 2011-07-27 富士通株式会社 Network equipment
JP5169485B2 (en) 2008-05-26 2013-03-27 富士通株式会社 Communication apparatus and control method
US8165169B2 (en) * 2008-12-02 2012-04-24 Adc Telecommunications, Inc. Clock priority chain level systems and methods
RU2504086C1 (en) * 2009-11-19 2014-01-10 Телефонактиеболагет Л М Эрикссон (Пабл) Sychronisation network configuration
FR2962282B1 (en) * 2010-06-30 2012-07-13 Alcatel Lucent METHOD FOR TRANSMITTING ESMC TYPE MESSAGE THROUGH A SONET / SDH DOMAIN

Citations (4)

* 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
US4142069A (en) * 1977-06-20 1979-02-27 The United States Of America As Represented By The Secretary Of The Army Time reference distribution technique
JPH01228342A (en) * 1988-03-09 1989-09-12 Fujitsu Ltd Network synchronizing device
EP0435395A2 (en) * 1989-12-28 1991-07-03 Philips Patentverwaltung GmbH Hierarchical synchronization method for the nodes of a telecommunication network

Patent Citations (4)

* 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
US4142069A (en) * 1977-06-20 1979-02-27 The United States Of America As Represented By The Secretary Of The Army Time reference distribution technique
JPH01228342A (en) * 1988-03-09 1989-09-12 Fujitsu Ltd Network synchronizing device
EP0435395A2 (en) * 1989-12-28 1991-07-03 Philips Patentverwaltung GmbH Hierarchical synchronization method for the nodes of a telecommunication network

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
CROSSETT J A ET AL: "SONET/SDH NETWORK SYNCHRONIZATION AND SYNCHRONIZATION SOURCES", GLOBECOM 1992, vol. 1 - 2 - 03, 6 December 1992 (1992-12-06), INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, pages 821 - 828, XP000357679 *
LI K -F: "Optimal facility selection algorithm for a synchronization network", GLOBECOM TOKYO '87. IEEE/IECE GLOBAL TELECOMMUNICATIONS CONFERENCE 1987. CONFERENCE RECORD (CAT. NO.87CH2520-5), TOKYO, JAPAN, 15-18 NOV. 1987, 1987, NEW YORK, NY, USA, IEEE, USA, pages 1043 - 1047 vol.2, XP002031579 *
PATENT ABSTRACTS OF JAPAN vol. 013, no. 551 (E - 857) 8 December 1989 (1989-12-08) *
STUMMER B VOLEJNIK W: "TAKTKONSTANZ SICHERT UEBERTRAGUNGSQUALITAET", TELCOM REPORT, vol. 17, no. 3, 1 May 1994 (1994-05-01), pages 115 - 117, XP000451993 *

Also Published As

Publication number Publication date
GB9605013D0 (en) 1996-05-08
WO1997033396A2 (en) 1997-09-12

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