GB2287618A - A hierarchical synchronization method and a telecommunications system employing message-based synchronisation - Google Patents

A hierarchical synchronization method and a telecommunications system employing message-based synchronisation

Info

Publication number
GB2287618A
GB2287618A GB9509149A GB9509149A GB2287618A GB 2287618 A GB2287618 A GB 2287618A GB 9509149 A GB9509149 A GB 9509149A GB 9509149 A GB9509149 A GB 9509149A GB 2287618 A GB2287618 A GB 2287618A
Authority
GB
United Kingdom
Prior art keywords
synchronization
node
telecommunications system
system employing
source
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
GB9509149A
Other versions
GB2287618B (en
GB9509149D0 (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 GB9509149D0 publication Critical patent/GB9509149D0/en
Publication of GB2287618A publication Critical patent/GB2287618A/en
Application granted granted Critical
Publication of GB2287618B publication Critical patent/GB2287618B/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

Abstract

The invention relates to a hierarchical synchronization method for a telecommunications system employing message-based synchronization and to a telecommunications system employing message-based synchronization and comprising a plurality of nodes (1...6) interconnected by transmission lines. In the method, the nodes interchange signals containing synchronization messages with information on the priority of the respective signal in the internal synchronization hierarchy of the system. In order to speed up resynchronization in failure situations, when the node loses the selected timing source, it attempts to select as a new synchronization source a neighbouring node transmitting a synchronization signature which is on the same level in the synchronization hierarchy of the system as the synchronization signature of the lost timing source and which is closer to the master node of the system than the node itself, whereby when such a node is found, the node selects it as its new synchronization source, or if such a node is not found, the node starts a procedure known per se for finding a new connection to the master node. <IMAGE>
GB9509149A 1992-11-09 1993-11-08 A hierarchical synchronization method and a telecommunications system employing message-based synchronisation Expired - Fee Related GB2287618B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI925071A FI92358C (en) 1992-11-09 1992-11-09 Hierarchical synchronization method and communication system using message-based synchronization
PCT/FI1993/000458 WO1994011965A1 (en) 1992-11-09 1993-11-08 A hierarchical synchronization method and a telecommunications system employing message-based synchronization

Publications (3)

Publication Number Publication Date
GB9509149D0 GB9509149D0 (en) 1995-07-12
GB2287618A true GB2287618A (en) 1995-09-20
GB2287618B GB2287618B (en) 1996-09-25

Family

ID=8536179

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9509149A Expired - Fee Related GB2287618B (en) 1992-11-09 1993-11-08 A hierarchical synchronization method and a telecommunications system employing message-based synchronisation

Country Status (5)

Country Link
AU (1) AU5422294A (en)
DE (1) DE4395761T1 (en)
FI (1) FI92358C (en)
GB (1) GB2287618B (en)
WO (1) WO1994011965A1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI95975C (en) * 1994-02-25 1996-04-10 Nokia Telecommunications Oy Hierarchical synchronization method
FI95979C (en) * 1994-03-01 1996-04-10 Nokia Telecommunications Oy Hierarchical synchronization procedure
EP1223684B1 (en) * 1994-07-06 2006-06-14 NTT Mobile Communications Network, Inc. Mobile communication system using base station frequency correction scheme
JP3197793B2 (en) * 1995-07-03 2001-08-13 富士通株式会社 Wireless device
FI104593B (en) * 1996-09-30 2000-02-29 Nokia Networks Oy Hierarchical synchronization procedure
FI104665B (en) * 1996-09-30 2000-04-14 Nokia Networks 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

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0262705A2 (en) * 1986-09-03 1988-04-06 Philips Patentverwaltung GmbH Arrangement for the nodes of a meshed telecommunication network
EP0435395A2 (en) * 1989-12-28 1991-07-03 Philips Patentverwaltung GmbH Hierarchical synchronization method for the nodes of a telecommunication network
EP0553360A1 (en) * 1991-08-19 1993-08-04 Fujitsu Limited Method for synchronizing synchronous data communication network, and communication device used in the network

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0262705A2 (en) * 1986-09-03 1988-04-06 Philips Patentverwaltung GmbH Arrangement for the nodes of a meshed telecommunication network
EP0435395A2 (en) * 1989-12-28 1991-07-03 Philips Patentverwaltung GmbH Hierarchical synchronization method for the nodes of a telecommunication network
EP0553360A1 (en) * 1991-08-19 1993-08-04 Fujitsu Limited Method for synchronizing synchronous data communication network, and communication device used in the network

Also Published As

Publication number Publication date
GB2287618B (en) 1996-09-25
FI92358B (en) 1994-07-15
DE4395761T1 (en) 1995-10-19
AU5422294A (en) 1994-06-08
FI925071A0 (en) 1992-11-09
FI925071A (en) 1994-05-10
FI92358C (en) 1994-10-25
GB9509149D0 (en) 1995-07-12
WO1994011965A1 (en) 1994-05-26

Similar Documents

Publication Publication Date Title
KR0175662B1 (en) Digital signal synchronization employing single elastic store
WO2001061898A3 (en) Reference time distribution over a network
CA2130066A1 (en) Ring Interworking Between Bidirectional Line-Switched Ring Transmission Systems and Path-Switched Ring Transmission Systems
CA2130067A1 (en) Ring Interworking Between Bidirectional Line-Switched Ring Transmission Systems
WO1995024772A3 (en) Hierarchical synchronization method
CA2040085A1 (en) Synchronizing method for sdh systems as well as method of and circuit arrangement for identifying different data structures
ATE27879T1 (en) MULTIPOINT DATA TRANSMISSION.
GB2287618A (en) A hierarchical synchronization method and a telecommunications system employing message-based synchronisation
FI801986A (en) OVER COVERING FACTORY TAKING SYNCHRONIZATION WITH VIDEO TRANSMISSION AV DIGITAL COMMUNICATION
WO1995024082A3 (en) Network arrangement
WO1995024801A3 (en) Hierarchical synchronization method
US4340962A (en) Circuit arrangement for the synchronization of a digital subscriber station by a digital exchange in a PCM telecommunication network
DE69224860T2 (en) Time control of the SDH data transmission
EA200100903A1 (en) INTRODUCTION OF THE FIRST INFORMATION SIGNAL IN THE SECOND DIGITAL INFORMATION SIGNAL FOR TRANSFER THROUGH THE TRANSMISSION MEDIUM
AU676695B2 (en) Network arrangement
DE59812951D1 (en) Transmission system with synchronization of data streams
EP0318227A3 (en) Frame synchronising method and system
EP0284106A3 (en) Circuitry for inserting a service channel for an information transmission system
US5579310A (en) Method for switching through digital signals
GB2287382A (en) A hierarchical synchronization method and a telecommunications system employing message-based synchronization
US4736372A (en) Method and apparatus of transmission for a digital signal
FI962666A0 (en) Decoding a data signal transmitted in a television system
DE3769827D1 (en) DEMULTIPLEX LEVEL OF A DIGITAL SIGNAL TRANSMISSION DEVICE.
KR100201332B1 (en) A local loop back circuit of vc1 in synchronous multiplexer
JP3010634B2 (en) Frame synchronous multiplex processing

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