GB2287158A - Hierarchical synchronization method - Google Patents

Hierarchical synchronization method

Info

Publication number
GB2287158A
GB2287158A GB9509026A GB9509026A GB2287158A GB 2287158 A GB2287158 A GB 2287158A GB 9509026 A GB9509026 A GB 9509026A GB 9509026 A GB9509026 A GB 9509026A GB 2287158 A GB2287158 A GB 2287158A
Authority
GB
United Kingdom
Prior art keywords
synchronization
node
signature
time period
preset time
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
GB9509026A
Other versions
GB9509026D0 (en
GB2287158B (en
Inventor
Jukka Kainulainen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Oyj
Original Assignee
Nokia Telecommunications Oy
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 filed Critical Nokia Telecommunications Oy
Publication of GB9509026D0 publication Critical patent/GB9509026D0/en
Publication of GB2287158A publication Critical patent/GB2287158A/en
Application granted granted Critical
Publication of GB2287158B publication Critical patent/GB2287158B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Small-Scale Networks (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

The invention relates to a hierarchical synchronization method for a telecommunications system employing message-base synchronization and comprising a plurality of nodes interconnected by transmission lines (A, B), wherein the nodes interchange signals containing synchronization messages with information on the priority of the respective signal in the internal synchronization hierarchy of the system, and wherein the node enters into a predetermined standard state for a preset time period in a change situation, such as a failure situation, in order to prevent the selection of faulty synchronization messages. In order to shorten a break caused by a failure or other change in the distribution of the frequency of the master node, a node, when there occurs deterioration in the selected synchronization signature of the node, immediately selects the deteriorated signature as its new synchronization signature and forcedly retains it for a preset time period at the most. <IMAGE>
GB9509026A 1992-11-09 1993-11-08 Hierarchical synchronization method Expired - Fee Related GB2287158B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI925074A FI91691C (en) 1992-11-09 1992-11-09 Hierarchical synchronization method
PCT/FI1993/000457 WO1994011964A1 (en) 1992-11-09 1993-11-08 Hierarchical synchronization method

Publications (3)

Publication Number Publication Date
GB9509026D0 GB9509026D0 (en) 1995-06-21
GB2287158A true GB2287158A (en) 1995-09-06
GB2287158B GB2287158B (en) 1996-09-25

Family

ID=8536182

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9509026A Expired - Fee Related GB2287158B (en) 1992-11-09 1993-11-08 Hierarchical synchronization method

Country Status (5)

Country Link
AU (1) AU5422194A (en)
DE (1) DE4395760T1 (en)
FI (1) FI91691C (en)
GB (1) GB2287158B (en)
WO (1) WO1994011964A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI95978C (en) * 1994-03-01 1996-04-10 Nokia Telecommunications Oy Hierarchical synchronization method
DE19653261A1 (en) * 1996-12-20 1998-06-25 Alsthom Cge Alcatel Synchronous digital message transmission system, control device, network element and central clock generator
DE19901588A1 (en) * 1999-01-16 2000-07-20 Alcatel Sa Synchronization of a network element in a synchronous digital communication network

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
EP0242117A2 (en) * 1986-04-16 1987-10-21 AT&T Corp. Distributed timing control for a distributed digital communication system
EP0435395A2 (en) * 1989-12-28 1991-07-03 Philips Patentverwaltung GmbH Hierarchical synchronization method for the nodes of a telecommunication network

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
EP0242117A2 (en) * 1986-04-16 1987-10-21 AT&T Corp. Distributed timing control for a distributed digital communication system
EP0435395A2 (en) * 1989-12-28 1991-07-03 Philips Patentverwaltung GmbH Hierarchical synchronization method for the nodes of a telecommunication network

Also Published As

Publication number Publication date
FI91691B (en) 1994-04-15
GB9509026D0 (en) 1995-06-21
AU5422194A (en) 1994-06-08
FI925074A0 (en) 1992-11-09
FI91691C (en) 1994-07-25
WO1994011964A1 (en) 1994-05-26
GB2287158B (en) 1996-09-25
DE4395760T1 (en) 1995-10-05

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20031108