WO1997001905A1 - Implementation d'un bus a tolerance de pannes dans un reseau de telecommunications - Google Patents

Implementation d'un bus a tolerance de pannes dans un reseau de telecommunications Download PDF

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Publication number
WO1997001905A1
WO1997001905A1 PCT/FI1996/000372 FI9600372W WO9701905A1 WO 1997001905 A1 WO1997001905 A1 WO 1997001905A1 FI 9600372 W FI9600372 W FI 9600372W WO 9701905 A1 WO9701905 A1 WO 9701905A1
Authority
WO
WIPO (PCT)
Prior art keywords
bus
network
node
synchronization
management
Prior art date
Application number
PCT/FI1996/000372
Other languages
English (en)
Inventor
Jukka Kainulainen
Mika LINDGRÉN
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
Priority to AU62263/96A priority Critical patent/AU6226396A/en
Priority to EP96920853A priority patent/EP0840968A1/fr
Publication of WO1997001905A1 publication Critical patent/WO1997001905A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/24—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks using dedicated network management hardware
    • 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

Definitions

  • a local management interface 12 located in the device, to which interface e.g. the network management system may be directly connected. There may be more than just one of these local management interfaces.
  • Messages may arrive from all the directions shown in the figure, and all these directions receive messages (in other words, the traffic from the summer is bidirectional in all the directions shown in the figure) .
  • a summing point 11 channels coming from the different directions are combined. Data coming from a certain direction is switched (transmitted) further to all the other directions. Only one transmitter at a time may transmit data (in case more transmitters transmit data to the bus simultaneously, the signals will be summed with each other and the data will be corrupted) .
  • FIGS 6a...6d show alternative switching devices for the node shown in Figure 4.
  • Figure 3b shows a situation in which a fault has arisen on the connection between nodes Nl and N2.
  • node N2 detects this fault, it selects a new timing source.
  • Figures 5a...5d show the operation of the method of the invention in a network in accordance with Figure 2.
  • the network is shown in the normal state, in which all the switches of the conditional switching points are in off-position.
  • a fault occurs in the master loop A between nodes M and 2.
  • nodes M and 2 cut the bus off from the faulty connection.
  • the nodes of the master loop are synchronized in the opposite direction.
  • Figures 6a...6d show various examples for implementing a single interface unit provided with a conditional switching.
  • Figure 6a shows a solution corresponding to that in Figure 4 in which solution the fault and status information are obtained directly from the multiplexing block and in which separate switches SW are used, via which the signal of the management channel is switched to the summer 11 when need be.
  • the signal is switched to the cross-connection block 91 (not shown in Figure 8), from which it is switched further.
  • Figure 6b shows a second alternative in which the entire signal (all the time ⁇ slots) are applied from the multiplexing block to the cross-connection block 92, from which the EOC channel is connected (when need be) to the summer 11 and the other channels are connected to the other desired points.

Abstract

Cette invention concerne l'implémentation d'un bus protégé, en particulier d'un bus de gestion dans un réseau de télécommunications comprenant une pluralité de n÷uds connectés les uns aux autres par des connexions de données. Dans ce réseau, les messages d'état de la synchronisation conformes à la recommandation G.704 sont transmis pour indiquer le niveau de qualité du signal en ce qui concerne la synchronisation. Selon cette méthode, un bus est implémenté dans le réseau pour transmettre l'information en-dehors du trafic de l'utilisateur. Pour protéger le bus, on se sert d'un point de commutation conditionnel (E) au niveau d'un ou de plusieurs n÷uds de façon que le bus soit commuté et passe par le point de commutation si un critère prédéterminé lié à la commutation conditionnelle est satisfait. Afin que l'implémentation de protection du bus soit simple, on utilise comme critère le niveau de qualité (QL) du message d'état de la synchronization, de sorte qu'au moment où ce message passe à un état indiquant que le signal en question ne doit pas être utilisé pour la synchronisation, le bus de gestion soit commuté pour passer par le point de commutation conditionnel.
PCT/FI1996/000372 1995-06-28 1996-06-26 Implementation d'un bus a tolerance de pannes dans un reseau de telecommunications WO1997001905A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU62263/96A AU6226396A (en) 1995-06-28 1996-06-26 Implementation of a fault-tolerant bus in a telecommunicatios network
EP96920853A EP0840968A1 (fr) 1995-06-28 1996-06-26 Implementation d'un bus a tolerance de pannes dans un reseau de telecommunications

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI953205A FI98582C (fi) 1995-06-28 1995-06-28 Varmennetun väylän toteutus tietoliikenneverkossa
FI953205 1995-06-28

Publications (1)

Publication Number Publication Date
WO1997001905A1 true WO1997001905A1 (fr) 1997-01-16

Family

ID=8543692

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1996/000372 WO1997001905A1 (fr) 1995-06-28 1996-06-26 Implementation d'un bus a tolerance de pannes dans un reseau de telecommunications

Country Status (4)

Country Link
EP (1) EP0840968A1 (fr)
AU (1) AU6226396A (fr)
FI (1) FI98582C (fr)
WO (1) WO1997001905A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6574192B1 (en) 1998-06-17 2003-06-03 Telefonaktiebolaget Lm Ericsson Communications network and an add and drop node

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
WO1994011966A1 (fr) * 1992-11-09 1994-05-26 Nokia Telecommunications Oy Procede de synchronisation hierarchique et systeme de telecommunications employant la synchronisation basee sur des messages
US5404134A (en) * 1987-12-11 1995-04-04 Fujitsu Limited System for carrying out connection management control of ring network

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US5404134A (en) * 1987-12-11 1995-04-04 Fujitsu Limited System for carrying out connection management control of ring network
WO1994011966A1 (fr) * 1992-11-09 1994-05-26 Nokia Telecommunications Oy Procede de synchronisation hierarchique et systeme de telecommunications employant la synchronisation basee sur des messages

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6574192B1 (en) 1998-06-17 2003-06-03 Telefonaktiebolaget Lm Ericsson Communications network and an add and drop node

Also Published As

Publication number Publication date
FI98582C (fi) 1997-07-10
AU6226396A (en) 1997-01-30
FI953205A (fi) 1996-12-29
FI953205A0 (fi) 1995-06-28
EP0840968A1 (fr) 1998-05-13
FI98582B (fi) 1997-03-27

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