EP2589170A1 - Method for transmitting an esmc message through a sonet/sdh domain - Google Patents

Method for transmitting an esmc message through a sonet/sdh domain

Info

Publication number
EP2589170A1
EP2589170A1 EP11729611.1A EP11729611A EP2589170A1 EP 2589170 A1 EP2589170 A1 EP 2589170A1 EP 11729611 A EP11729611 A EP 11729611A EP 2589170 A1 EP2589170 A1 EP 2589170A1
Authority
EP
European Patent Office
Prior art keywords
synchronization
synchronous
ethernet
sonet
sdh
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.)
Withdrawn
Application number
EP11729611.1A
Other languages
German (de)
French (fr)
Inventor
Dinh Thai Bui
Michel Le Pallec
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.)
Alcatel Lucent SAS
Original Assignee
Alcatel Lucent SAS
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 Alcatel Lucent SAS filed Critical Alcatel Lucent SAS
Publication of EP2589170A1 publication Critical patent/EP2589170A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/0008—Synchronisation information channels, e.g. clock distribution lines
    • 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
    • H04J3/0641—Change of the master or reference, e.g. take-over or failure of the master
    • 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
    • H04J3/0658—Clock or time synchronisation among packet nodes
    • H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
    • H04J3/0664—Clock or time synchronisation among packet nodes using timestamps unidirectional timestamps
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
    • H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
    • H04J2203/0073—Services, e.g. multimedia, GOS, QOS
    • H04J2203/0082—Interaction of SDH with non-ATM protocols
    • H04J2203/0085—Support of Ethernet
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
    • H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
    • H04J2203/0089—Multiplexing, e.g. coding, scrambling, SONET
    • 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
    • H04J3/065—Synchronisation among TDM nodes using timestamps
    • 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
    • H04J3/0658—Clock or time synchronisation among packet nodes
    • H04J3/0673—Clock or time synchronisation among packet nodes using intermediate nodes, e.g. modification of a received timestamp before further transmission to the next packet node, e.g. including internal delay time or residence time into the packet

Definitions

  • the present invention relates to the field of communication networks and more particularly to the transmission of information conveyed by messages of the Ethernet Synchronization Messaging Channel (ESMC) type through Synchronous Optical Networking / Synchronous Digital Hierarchy (SONET / SDH) type domains.
  • ESMC Ethernet Synchronization Messaging Channel
  • SONET / SDH Synchronous Digital Hierarchy
  • the domains SDH / SONET and Synchronous Ethernet (SyncE) are compatible from the point of view of the physical distribution of a synchronization frequency as shown in FIG. 1, where nodes of the SyncE E (fig.lb) or hybrid type H, that is to say having both SDH / SONET and SyncE interfaces, (fig.lc) are inserted into an existing synchronization chain comprising SDH / SONET type nodes S and synchronization units (Synchronization Supply Unit) SSU, the distribution of the synchronization signal being performed by the physical layer in all of these domains.
  • the quality level of the synchronization signal (called Quality Level or QL) is conveyed at the level of the physical layer, in the header of the SONET / SDH frames.
  • TLV Type Length Value
  • TLV type structures have nevertheless been proposed internally ITU-T in order to opt for the use of these ESMC type messages. These additional TLVs can convey other information useful for managing synchronization.
  • the need is therefore to propose a method that allows the transmission of information related to additional TLV structures with respect to the QL-TLV 9 through domains of the SDH / SONET type 3.
  • the present invention relates to a method for transmitting an Ethernet Synchronization Messaging Channel message "ESMC" between a first and a second Synchronous Ethernet domain "SyncE", said first and second domains being interconnected by a third domain.
  • Synchronous Optical Networking or Synchronous Digital Hierarchy type "SONET / SDH” in which at least a portion of said Ethernet Synchronization Messaging Channel message "ESMC” is encapsulated at the input of said third domain and de-encapsulated at the output of said third domain. to create a network tunnel through this third domain of the Synchronous Optical Networking / Synchronous Digital Hierarchy type "SONET / SDH".
  • said message comprises at least one Type Length Value field "TLV" different from the Quality Level field "QL-TLV”.
  • the encapsulation and the decapsulation of the messages are done at the level of the synchronous hybrid nodes Ethemet-Synchronous Optical Networking / Synchronous Digital Hierarchy SyncE-SDH / SONET located at the interface of the different domains.
  • a Synchronous Ethernet-Synchronous Optical Networking / Synchronous Digital Hierarchy hybrid node "SyncE-SDH / SONET" receives
  • At least two distinct synchronization signals having traveled distinct routes and originating from separate source edge hybrid nodes and, on the other hand, at least two distinct Ethernet Messaging Channel Synchronization "ESMC" messages corresponding to said, at least two synchronization signals, and coming from separate tunnels,
  • said at least two messages include an additional Type Length Value "TLV” field for distinguishing between different Ethernet Messaging Channel Synchronization "ESMC" messages.
  • TLV Type Length Value
  • a Synchronous Optical Networking / Synchronous Digital Hierarchy (SONET / SDH) type node receives at least two distinct synchronization signals having traveled distinct routes and originating from separate hybrid source edge nodes,
  • said synchronization management system then transmitting to the hybrid node Synchronous Ethernet-Synchronous Optical Networking Synchronous Digital Hierarchy SyncE-SONET / SDH recipient, an identification of the synchronization source corresponding to the selected synchronization signal to allow the hybrid destination edge node to consider the tunnel encapsulating the Ethernet Synchronization message. Messaging Channel "ESMC" associated with the selected primary sync signal.
  • ESMC Messaging Channel
  • the at least one additional Type Length Value field "TLV" indicates the level of stability of the frequency provided by the frequency source.
  • At least one additional Type Length Value field "TLV" indicates the number of nodes traversed by said message from its source node.
  • the at least one additional Type Length Value field "TLV" includes an identification of the nodes traversed by said message.
  • the tunnel associated with the Synchronous Optical Networking / Synchronous Digital Hierarchy "SONET / SDH" Messaging Synchronous Ethernet Messaging Channel message follows the same route as the synchronization signal.
  • the tunnel associated with the message follows the same route as the synchronization signal.
  • Ethernet Synchronous Messaging Channel "ESMC” Synchronous Optical Networking / Synchronous Domain Digital Hierarchy “SONET / SDH” follows a different route from the sync signal.
  • the present invention also relates to a Synchronous Ethernet-Synchronous Optical Networking / Synchronous Digital Hierarchy hybrid node "SyncE-SDH / SONET” comprising means of encapsulation of an Ethernet type Messaging Channel Synchronization "ESMC" message which comprises at least one field Type Length Value "TLV" different from the Quality Level field, called "QL-TLV".
  • the present invention also relates to a Synchronous Ethernet-Synchronous Optical Networking / Synchronous Digital Hierarchy hybrid node "SyncE-SONET / SDH" comprising
  • reception means capable of receiving at least one Messagmg Channel Synchronization Ethernet message "ESMC” comprising at least one Type Length Value field “TLV” different from the Quality Level field “QL-TLV” encapsulated for transmission through a domain Synchronous Optical Networking / Synchronous Digital Hierarchy "SDH / SONET” and,
  • the present invention also relates to a Synchronous Optical Networking / Synchronous Digital Hierarchy-type node "SONET / SDH" comprising
  • the present invention also relates to a synchronization management system comprising
  • FIG. 1 represents a diagram of three types of synchronization chain, the first (a) comprising only SDH / SONET type nodes, the second (b) comprising SDH / SONET type nodes and Synchronous Ethernet type nodes. (SyncE) and the third (c) including SDH / SONET type nodes and SDH / SONET-SyncE hybrid nodes;
  • FIG. 2 represents a diagram of a synchronization configuration where two domains of SyncE type are interconnected by an SDH / SONET type domain;
  • FIG. 3 represents the establishment of a network tunnel between two hybrid edge nodes (respective SyncE domains) across a SDH / SONET type domain;
  • FIG. 4 shows the establishment of two tunnels connecting two SyncE-type domains through an SDH / SONET-type domain and having a hybrid destination edge hybrid node
  • FIG. 5 shows the establishment of two tunnels connecting two SyncE-like domains through an SDH / SONET-type domain having a common destination edge hybrid node and also having a common path segment in the SDH / SONET domain;
  • FIG. 6 shows the messages exchanged between the synchronization management system and the SI node located in the SONET / SDH domain on the one hand and between the synchronization management system and the recipient edge hybrid node situated on the other hand. at the interface of the SONET / SDH domain and the second SyncE domain on the other hand;
  • ESMC Ethernet Synchronization Messaging Channel
  • SONET corresponds to the acronym Synchronous Optical Networking
  • SDH corresponds to the acronym Synchronous Digital Hierarchy
  • TLV corresponds to the acronym Type Length Value
  • QL corresponds to the acronym Quality Level
  • Synchronous Ethernet corresponds to the acronym Synchronous Ethernet
  • encapsulation corresponds to encapsulation in the packet sense in which the packet is wrapped in a protocol structure (including header, checksum, etc.) so as to allow its transmission in another domain managed by a different protocol;
  • disencapsulation refers to the inverse operation at the end of which we find the initial packet.
  • the embodiments of the present invention correspond to the transmission of ESMC messages in a tunnel connecting two SyncE-type domains through a SDH / SONET type domain.
  • the synchronization may be distributed by synchronization physical signals 11 of a source edge hybrid node 13 belonging to a first SyncE domain to a destination edge hybrid node belonging to a second SyncE domain. This distribution is realized of link in link at the level of the physical layer through the domain SONET / SDH.
  • the ESMC messages 17 are, in turn, encapsulated at the hybrid source edge node 13, transmitted through the SONET / SDH domain 3 through a network tunnel 19 associated with the ESMC message and then disseminationencapsulés at the hybrid node of Destination Border 15.
  • the ESMC messages 17 traverse the SDH / SONET domain in a transparent manner, which makes it possible to avoid the filtering of the additional TLV fields 7 at the SDH / SONET-SyncE interfaces.
  • the network tunnel 19 associated with the ESMC messages traverses the SDH / SONET nodes S transparently, the path taken by this tunnel is not related to the path taken by the synchronization signals 11 Nevertheless, it is recommended that the borrowed paths be the same, where possible, to provide more effective protection in case of reconfiguration of the synchronization path due, for example, to degradation of the primary signal.
  • QL Quality of Information
  • this is normally transmitted via the SONET / SDH header, but can also be encapsulated with other TLV structures and transmitted at the packet level through the associated tunnel.
  • the ESMC message described previously.
  • the value of QL extracted from the physical layer of the SDH / SONET domain can be compared to the encapsulated QL value and in case of inconsistency between the two QL values, the encapsulated value is then ignored by the hybrid node. 15 and an alarm is sent to the management synchronization system (synchronization management plane) to signal such an inconsistency.
  • management synchronization system synchronization management plane
  • tunnels 19 as described in FIG. 3 can lead to the situation described in FIG. 4 where two distinct tunnels having distinct paths, originating from two hybrid source edge nodes 13 distinct and corresponding to two paths of distinct timing distributions have a common recipient edge hybrid node.
  • one of the two source edge hybrid nodes 13 corresponds to the primary frequency source and the other the secondary frequency source.
  • one of the additional TLV fields 9 is a field that makes it possible to distinguish two ESMC tunnels 19.
  • This field may, for example, be a TLV field "identity of the source (source ID TLV) "comprising an identification of the hybrid source edge node of the ESMC tunnel 13 or a tunnel identity (tunnel ID TLV) field comprising an identification of the tunnel 19 or a" route route (route trace) "field including an identification of all the nodes crossed by the message ESMC 17 or a combination of these three fields.
  • source ID TLV the source edge node of the ESMC tunnel 13
  • tunnel identity tunnel identity
  • route route trace route trace
  • FIG. 5 Another configuration presented in FIG. 5 corresponds to two synchronization distribution paths, coming from two different synchronization sources, having a node, or even a common segment in the SDH / SONET domain 3.
  • the SDH / SONET type node receiving the two synchronization distributions denoted by SI, selects between the two distributions and transmits the signal selected to the destination hybrid hybrid node 15.
  • This selection is generally made according to the priority rules sent by the synchronization management system, for example, by sending a priority list.
  • the synchronization is traditionally controlled by the synchronization management system.
  • the re-selection of a new synchronization source is carried out locally at the node SI: by comparing the quality level values " QL-TLV "contained in the SONET / SDH frame for example.
  • the hybrid destination edge node 15 can not know the advent or the result of this selection allowing it to associate the physical synchronization path with the ESMC information. relative transported at the packet level, through a network tunnel.
  • a message of re-selection (eg an alarm) is sent by the node SI to the synchronization management system (synchronization management) to inform the latter of the physical port linked to the new primary synchronization signal 11 which will be transmitted to the hybrid destination edge node 15.
  • the synchronization management system is subsequently responsible for linking the port information of the new primary signal thus selected at the node SI and the identity of the source edge hybrid node associated with the new signal of synchronization thus selected by SI; this by cooperating, for example, with the SONET / SDH transport network management system (in English SONET / SDH network management).
  • the selection of synchronization sources at the node SI is performed automatically, at the software level and not at the hardware level. Therefore, it is quite easy to update the software to add instructions such as sending an alarm to the sync management system.
  • FIG. 6 represents the different signals exchanged with the synchronization management system 21.
  • the synchronization management system 21 sends to the node SI a configuration message 26 including, for example, a priority list for locally controlling the process of selecting the synchronization signal among the synchronization signals received on the physical ports. 22 and 23.
  • the primary synchronization signal is used to lock the local clock of the SI equipment. This scenario assumes that the primary synchronization signal initially selected by the SI node is provided by port 22.
  • the node SI performs a re-selection of the primary signal from the quality level of the received signals and the list of priorities.
  • the new primary signal is provided by the port 23.
  • An alarm message 27, including an identification of the physical port 23, is then sent to the synchronization management system 21.
  • the synchronization management system 21 finds (thanks to a correspondence (in English "mapping") with established connections) the identification of the hybrid source edge node 13 associated also called source (source ID ).
  • a message 29, containing the identification of the source edge hybrid node (source ID) 13 is then transmitted to the hybrid destination edge node 15. The latter can then select, among the ESMC tunnels 19 to which it is connected, the ESMC tunnel. 19 corresponding to the source thus indicated.
  • This method therefore allows the destination edge hybrid node to associate the tunnel associated with the ESMC message with the source of the selected primary signal. It should also be noted that the embodiments presented above for two physical synchronization distribution paths may be generalized to more than 2 distribution paths from different (synchronization) sources, and the selection modes presented may be applied to a particular any number of distribution paths of the synchronization frequency.
  • the embodiments of the present invention make it possible to transmit messages of the ESMC type 17 comprising additional TLV fields 7 between two SyncE domains 1 interconnected by an SDH / SONET domain 3 while avoiding the filtering of the information conveyed by these additional fields. 7 at the interface between the domains and allowing the destination hybrid node 15 to associate the received ESMC messages with the received primary synchronization signal 11 and thus to use these messages in a manner consistent with the synchronization physical signal primary.

Abstract

The embodiments of the present invention pertain to a method for transmitting an Ethernet synchronization messaging channel (ESMC) message between a first and a second synchronous Ethernet (SyncE) domain, said first and second domains being interconnected by a third synchronous optical networking/synchronous digital hierarchy (SONET/SDH) domain, wherein at least a portion of said Ethernet synchronization messaging channel (ESMC) is encapsulated at the input of said third domain, and de-encapsulated at the output of said third domain, so as to create a network tunnel through the synchronous optical networking/synchronous digital hierarchy (SONET/SDH) domain.

Description

PROCÉDÉ DE TRANSMISSION D'UN MESSAGE DE TYPE ESMC A TRAVERS UN DOMAINE DE TYPE SONET/SDH  METHOD FOR TRANSMITTING ESMC TYPE MESSAGE THROUGH SONET / SDH DOMAIN
La présente invention concerne le domaine des réseaux de communication et plus particulièrement la transmission des informations véhiculées par les messages de type Ethernet Synchronisation Messaging Channel (ESMC) à travers des domaines de type Synchronous Optical Networking/ Synchronous Digital Hierarchy (SONET/SDH). The present invention relates to the field of communication networks and more particularly to the transmission of information conveyed by messages of the Ethernet Synchronization Messaging Channel (ESMC) type through Synchronous Optical Networking / Synchronous Digital Hierarchy (SONET / SDH) type domains.
En effet, les domaines SDH/SONET et Synchronous Ethernet (SyncE) sont compatibles du point du vue de la distribution physique d'une fréquence de synchronisation comme représenté sur la figure 1 où des nœuds de type SyncE E (fig.l b) ou hybrides H, c'est-à-dire ayant à la fois les interfaces SDH/SONET et SyncE, (fig.l c) sont insérés dans une chaîne de synchronisation existante comprenant des nœuds de type SDH/SONET S et des unités de synchronisation (Synchronisation Supply Unit) SSU , la distribution du signal de synchronisation étant réalisée par la couche physique dans l'ensemble de ces domaines. Indeed, the domains SDH / SONET and Synchronous Ethernet (SyncE) are compatible from the point of view of the physical distribution of a synchronization frequency as shown in FIG. 1, where nodes of the SyncE E (fig.lb) or hybrid type H, that is to say having both SDH / SONET and SyncE interfaces, (fig.lc) are inserted into an existing synchronization chain comprising SDH / SONET type nodes S and synchronization units (Synchronization Supply Unit) SSU, the distribution of the synchronization signal being performed by the physical layer in all of these domains.
Dans les domaines SONET/SDH, le niveau de qualité du signal de synchronisation (appelé Quality Level ou QL en Anglais) est véhiculé au niveau de la couche physique, dans l'en- tête des trames SONET/SDH. In the SONET / SDH domains, the quality level of the synchronization signal (called Quality Level or QL) is conveyed at the level of the physical layer, in the header of the SONET / SDH frames.
Dans les domaines SyncE, le statut de la synchronisation est, quant à lui, véhiculé par les messages (ou paquets) de type ESMC qui contiennent des structures de type Type Length Value (TLV) telles que spécifiées dans le protocole 802.3 de l'institut des ingénieurs électriques et électroniques (Institute of Electrical and Electronic Engineers (IEEE 802.3)). A l'heure actuelle, une seule de ces structures TLV est standardisée par l'Union International des Télécommunications (UIT-T ou ITU-T en Anglais). Il s'agit du champ TLV indiquant le niveau de qualité du signal de synchronisation (désigné en standard par QL-TLV) afin de maintenir la compatibilité avec SONET/SDH.  In SyncE domains, the synchronization status is conveyed by ESMC messages (or packets) that contain Type Length Value (TLV) type structures as specified in the 802.3 protocol of the institute. Electrical and Electronic Engineers (IEEE 802.3). At present, only one of these TLV structures is standardized by the International Telecommunication Union (ITU-T or ITU-T in English). This is the TLV field indicating the quality level of the sync signal (designated QL-TLV standard) to maintain compatibility with SONET / SDH.
Des propositions d'ajout de structures de type TLV ont néanmoins été proposées à l'intérieur de UIT-T afin d'optirniset l'utilisation de ces messages de type ESMC. Ces TLVs additionnelles permettent de véhiculer d'autres informations utiles à la gestion de la synchronisation. Proposals to add TLV type structures have nevertheless been proposed internally ITU-T in order to opt for the use of these ESMC type messages. These additional TLVs can convey other information useful for managing synchronization.
Or, dans la configuration décrite sur la figure 2 dans laquelle deux domaines de type SyncE 1 sont interconnectés par un domaine de type SONET/SDH 3, les éventuels structures TLV additionnelles 7 (c'est-à-dire autre que la structure QL-TLV 9) sont filtrées au niveau de l'interface SyncE-SONET/ SDH. Ceci est du au fait que ces informations ne sont pas définies au niveau de l'en-tête SONET/SDH et qu'il n'y a plus d'extension possible du format de ces en-têtes sans impacter profondément (i.e. modification matérielle) les très nombreux équipements SONET/ SDH déjà déployés sur sites.  However, in the configuration described in FIG. 2 in which two SyncE 1 domains are interconnected by a SONET / SDH type domain 3, the possible additional TLV structures 7 (that is to say other than the QL-structure TLV 9) are filtered at the SyncE-SONET / SDH interface. This is because this information is not defined at the SONET / SDH header level and there is no longer possible extension of the format of these headers without deeply impacting (ie hardware modification ) the numerous SONET / SDH equipment already deployed on sites.
La nécessité est donc de proposer une méthode qui permette la transmission des informations liées aux structures TLV supplémentaires par rapport au QL-TLV 9 à travers des domaines de type SDH/SONET 3. The need is therefore to propose a method that allows the transmission of information related to additional TLV structures with respect to the QL-TLV 9 through domains of the SDH / SONET type 3.
Ainsi, la présente invention concerne un procédé de transmission d'un message de type Ethernet Synchronisation Messaging Channel « ESMC » entre un premier et un deuxième domaine de type Synchronous Ethernet « SyncE », lesdits premier et deuxième domaines étant interconnectés par un troisième domaine de type Synchronous Optical Networking ou Synchronous Digital Hierarchy « SONET/SDH » dans lequel au moins une partie dudit message de type Ethernet Synchronisation Messaging Channel « ESMC » est encapsulée, à l'entrée dudit troisième domaine et désencapsulée à la sortie dudit troisième domaine de manière à créer un tunnel réseau à travers ce troisième domaine de type Synchronous Optical Networking/Synchronous Digital Hierarchy « SONET/SDH ». Thus, the present invention relates to a method for transmitting an Ethernet Synchronization Messaging Channel message "ESMC" between a first and a second Synchronous Ethernet domain "SyncE", said first and second domains being interconnected by a third domain. Synchronous Optical Networking or Synchronous Digital Hierarchy type "SONET / SDH" in which at least a portion of said Ethernet Synchronization Messaging Channel message "ESMC" is encapsulated at the input of said third domain and de-encapsulated at the output of said third domain. to create a network tunnel through this third domain of the Synchronous Optical Networking / Synchronous Digital Hierarchy type "SONET / SDH".
Selon un autre aspect de la présente invention, ledit message comprend au moins un champ Type Length Value « TLV » différent du champ Quality Level « QL-TLV ». Selon un aspect additionnel de la présente invention, l'encapsulation et la désencapsulation des messages se font au niveau des nœuds hybrides Synchronous Ethemet-Synchronous Optical Networking/Synchronous Digital Hierarchy « SyncE- SDH/SONET » situés à l'interface des différents domaines. According to another aspect of the present invention, said message comprises at least one Type Length Value field "TLV" different from the Quality Level field "QL-TLV". According to an additional aspect of the present invention, the encapsulation and the decapsulation of the messages are done at the level of the synchronous hybrid nodes Ethemet-Synchronous Optical Networking / Synchronous Digital Hierarchy SyncE-SDH / SONET located at the interface of the different domains.
Selon un aspect supplémentaire de la présente invention, un nœud hybride Synchronous Ethernet-Synchronous Optical Networking/Synchronous Digital Hierarchy « SyncE-SDH/SONET » reçoit According to a further aspect of the present invention, a Synchronous Ethernet-Synchronous Optical Networking / Synchronous Digital Hierarchy hybrid node "SyncE-SDH / SONET" receives
d'une part, au moins deux signaux de synchronisation distincts ayant parcourus des itinéraires distincts et provenant de nœuds hybrides de bordure sources distincts et, d'autre part, au moins deux messages de type Ethernet Synchronisation Messaging Channel « ESMC » distincts correspondant auxdits, au moins deux signaux de synchronisation, et issus de tunnels distincts, on the one hand, at least two distinct synchronization signals having traveled distinct routes and originating from separate source edge hybrid nodes and, on the other hand, at least two distinct Ethernet Messaging Channel Synchronization "ESMC" messages corresponding to said, at least two synchronization signals, and coming from separate tunnels,
dans lequel lesdits, au moins deux, messages comprennent un champ Type Length Value « TLV » additionnel permettant de distinguer les différents messages de type Ethernet Synchronisation Messaging Channel « ESMC ». wherein said at least two messages include an additional Type Length Value "TLV" field for distinguishing between different Ethernet Messaging Channel Synchronization "ESMC" messages.
Selon un autre aspect de la présente invention, un nœud de type Synchronous Optical Networking/Synchronous Digital Hierarchy « SONET/SDH » reçoit au moins deux signaux de synchronisation distincts ayant parcourus des itinéraires distincts et provenant de nœuds hybrides de bordure sources distincts, According to another aspect of the present invention, a Synchronous Optical Networking / Synchronous Digital Hierarchy (SONET / SDH) type node receives at least two distinct synchronization signals having traveled distinct routes and originating from separate hybrid source edge nodes,
sélectionne le signal de synchronisation primaire à distribuer, en fonction d'une liste de priorités fournie par un système de gestion de synchronisation, selects the primary synchronization signal to be distributed, according to a priority list provided by a synchronization management system,
et dans lequel, en cas de dégradation du signal de synchronisation primaire et de re- sélection du signal de synchronisation primaire, un message, comprenant une identification du nouveau signal de synchronisation primaire sélectionné, est transmis au système de gestion de synchronisation, and wherein, in case of degradation of the primary synchronization signal and re-selection of the primary synchronization signal, a message, including an identification of the selected new primary synchronization signal, is transmitted to the synchronization management system,
ledit système de gestion de synchronisation transmettant alors, au nœud hybride Synchronous Ethernet-Synchronous Optical Networking/Synchronous Digital Hierarchy « SyncE-SONET/SDH » destinataire, une identification de la source de synchronisation correspondant au signal de synchronisation sélectionné afin de permettre au nœud hybride de bordure destinataire de considérer le tunnel encapsulant le message Ethernet Synchronisation Messaging Channel « ESMC » associé au signal de synchronisation primaire sélectionné. said synchronization management system then transmitting to the hybrid node Synchronous Ethernet-Synchronous Optical Networking Synchronous Digital Hierarchy SyncE-SONET / SDH recipient, an identification of the synchronization source corresponding to the selected synchronization signal to allow the hybrid destination edge node to consider the tunnel encapsulating the Ethernet Synchronization message. Messaging Channel "ESMC" associated with the selected primary sync signal.
Selon un aspect additionnel de la présente invention le, au moins un, champ Type Length Value « TLV » additionnel indique le niveau de stabilité de la fréquence fournie par la source de fréquence. According to an additional aspect of the present invention, the at least one additional Type Length Value field "TLV" indicates the level of stability of the frequency provided by the frequency source.
Selon un aspect supplémentaire de la présente invention, au moins un, champ Type Length Value « TLV » additionnel indique le nombre de nœuds traversés par ledit message depuis son nœud source. According to a further aspect of the present invention, at least one additional Type Length Value field "TLV" indicates the number of nodes traversed by said message from its source node.
Selon un autre aspect de la présente invention le, au moins un, champ Type Length Value « TLV » additionnel comprend une identification des nœuds traversés par ledit message. Selon un aspect supplémentaire de la présente invention, le tunnel associé au message Ethernet Synchronisation Messaging Channel « ESMC » du domaine Synchronous Optical Networking/Synchronous Digital Hierarchy « SONET/SDH » suit le même itinéraire que le signal de synchronisation. Selon un aspect additionnel de la présente invention, le tunnel associé au messageAccording to another aspect of the present invention, the at least one additional Type Length Value field "TLV" includes an identification of the nodes traversed by said message. According to a further aspect of the present invention, the tunnel associated with the Synchronous Optical Networking / Synchronous Digital Hierarchy "SONET / SDH" Messaging Synchronous Ethernet Messaging Channel message follows the same route as the synchronization signal. According to an additional aspect of the present invention, the tunnel associated with the message
Ethernet Synchronisation Messaging Channel « ESMC » du domaine Synchronous Optical Networking/Synchronous Digital Hierarchy « SONET/SDH » suit un itinéraire différent du signal de synchronisation. La présente invention concerne également un nœud hybride Synchronous Ethernet- Synchronous Optical Networking/Synchronous Digital Hierarchy « SyncE- SDH/SONET » comprenant des moyens d'encapsulation d'un message de type Ethernet Synchronisation Messaging Channel « ESMC » qui comporte au moins un champ Type Length Value « TLV » différent du champ Quality Level, appelé « QL-TLV ». Ethernet Synchronous Messaging Channel "ESMC" Synchronous Optical Networking / Synchronous Domain Digital Hierarchy "SONET / SDH" follows a different route from the sync signal. The present invention also relates to a Synchronous Ethernet-Synchronous Optical Networking / Synchronous Digital Hierarchy hybrid node "SyncE-SDH / SONET" comprising means of encapsulation of an Ethernet type Messaging Channel Synchronization "ESMC" message which comprises at least one field Type Length Value "TLV" different from the Quality Level field, called "QL-TLV".
La présente invention concerne également un nœud hybride Synchronous Ethernet- Synchronous Optical Networking/Synchronous Digital Hierarchy « SyncE-SONET/SDH » comprenant The present invention also relates to a Synchronous Ethernet-Synchronous Optical Networking / Synchronous Digital Hierarchy hybrid node "SyncE-SONET / SDH" comprising
- des moyens de réception aptes à recevoir au moins un message de type Ethernet Synchronisation Messagmg Channel « ESMC » comportant au moins un champ Type Length Value « TLV » différent du champ Quality Level « QL-TLV » encapsulé pour être transmis à travers un domaine de type Synchronous Optical Networking/Synchronous Digital Hierarchy « SDH/SONET » et,  reception means capable of receiving at least one Messagmg Channel Synchronization Ethernet message "ESMC" comprising at least one Type Length Value field "TLV" different from the Quality Level field "QL-TLV" encapsulated for transmission through a domain Synchronous Optical Networking / Synchronous Digital Hierarchy "SDH / SONET" and,
- des moyens de désencapsulation dudit message et des moyens de lecture des champs Type Length Value « TLV ».  means for de-encapsulation of said message and means for reading the Type Length Value fields "TLV".
La présente invention concerne également un nœud de type Synchronous Optical Networking/Synchronous Digital Hierarchy « SONET/SDH » comprenant The present invention also relates to a Synchronous Optical Networking / Synchronous Digital Hierarchy-type node "SONET / SDH" comprising
- des moyens de réception des signaux de synchronisation destinés à un domaine de type Synchronous Ethernet « SyncE »,  means for receiving the synchronization signals intended for a Synchronous Ethernet "SyncE" type domain,
- des moyens de sélection desdits signaux de synchronisation en fonction d'une liste de priorité fournie par un système de gestion de synchronisation ou en fonction des valeurs de niveau de qualité « QL » contenues dans la trame SONET/SDH en cas de dégradation du signal de synchronisation primaire définie à la fois par la liste de priorités et les niveaux de qualité « QL » des signaux de synchronisation disponibles et - des moyens de transmission d'un message d'alarme vers ledit système de gestion de synchronisation indiquant les informations identifiant le port physique associé au nouveau signal de synchronisation primaire transmis vers le domaine de type Synchronous Ethernet « SyncE » en cas d'échec du signal de synchronisation primaire initial. means for selecting said synchronization signals according to a priority list provided by a synchronization management system or as a function of the quality level values "QL" contained in the SONET / SDH frame in the event of signal degradation primary synchronization defined by both the priority list and the QL quality levels of the available synchronization means for transmitting an alarm message to said synchronization management system indicating the information identifying the physical port associated with the new primary synchronization signal transmitted to the "SyncE" Synchronous Ethernet domain in the event of failure of the initial primary synchronization signal.
La présente invention concerne également un système de gestion de synchronisation comprenant The present invention also relates to a synchronization management system comprising
- des moyens d'établissement et de configuration d'une liste de priorité de signaux de synchronisation destinés à être distribués d'un premier domaine de type Synchronous Ethernet « SyncE » vers un deuxième domaine de type Synchronous Ethernet « SyncE » à travers un troisième domaine de type Synchronous Optical Networking/Synchronous Digital Hierarchy « SONET/SDH »,  means for establishing and configuring a synchronization signal priority list intended to be distributed from a first Synchronous Ethernet "SyncE" domain to a second Synchronous Ethernet "SyncE" domain through a third Synchronous Optical Networking / Synchronous Digital Hierarchy Domain "SONET / SDH",
- des moyens de transmission de ladite liste aux nœuds dudit domaine Synchronous Optical Networking/Synchronous Digital Hierarchy « SONET/SDH »,  means for transmitting said list to the nodes of said Synchronous Optical Networking / Synchronous Digital Hierarchy domain "SONET / SDH",
- des moyens de réception d'un message d'alarme émis par un nœud du domaine SONET/SDH indiquant l'identité du nouveau port associé au nouveau signal de synchronisation primaire sélectionné,  means for receiving an alarm message sent by a node of the SONET / SDH domain indicating the identity of the new port associated with the new selected primary synchronization signal,
- des moyens pour réaliser la corrélation entre l'identité du nouveau port associé au nouveau signal de synchronisation primaire, et le tunnel encapsulant les messages de type Ethernet Synchronisation Messaging Channel « ESMC » associé au nouveau signal primaire,  means for correlating the identity of the new port associated with the new primary synchronization signal, and the tunnel encapsulating the Ethernet Synchronization Messaging Channel "ESMC" messages associated with the new primary signal,
des moyens de transmission, vers le nœud hybride destinataire Synchronous Ethernet-Synchronous Optical Networking/ Synchronous Digital Hierarchy « SyncE- SONET/SDH », situé à la jonction, du deuxième et du troisième domaine, d'un message indiquant l'identité du tunnel encapsulant les messages de type Ethernet Synchronisation Messaging Channel « ESMC » à considérer. D'autres caractéristiques et avantages de l'invention apparaîtront dans la description qui va maintenant en être faite, en référence aux dessins annexés qui en représentent, à titre indicatif mais non limitatif, un mode de réalisation possible. Sur ces dessins: means for transmitting, to the Synchronous Ethernet-Synchronous Optical Networking / Synchronous Digital Hierarchy "Sync-SONET / SDH" hybrid destination node, at the junction of the second and third domains, a message indicating the identity of the tunnel encapsulating Ethernet Messaging Channel Synchronization "ESMC" messages to consider. Other features and advantages of the invention will appear in the description which will now be made, with reference to the accompanying drawings which represent, by way of indication but not limitation, a possible embodiment. On these drawings:
- la figure 1 représente un schéma de trois types de chaîne de synchronisation, la première (a) comprenant uniquement des nœuds de type SDH/SONET, la deuxième (b) comprenant des nœuds de type SDH/SONET et des nœuds de type Synchronous Ethernet (SyncE) et la troisième (c) comprenant des nœuds de type SDH/SONET et des nœuds hybrides SDH/SONET-SyncE; FIG. 1 represents a diagram of three types of synchronization chain, the first (a) comprising only SDH / SONET type nodes, the second (b) comprising SDH / SONET type nodes and Synchronous Ethernet type nodes. (SyncE) and the third (c) including SDH / SONET type nodes and SDH / SONET-SyncE hybrid nodes;
- la figure 2 représente un schéma d'une configuration de synchronisation où deux domaines de type SyncE sont interconnectés par un domaine de type SDH/SONET;  FIG. 2 represents a diagram of a synchronization configuration where two domains of SyncE type are interconnected by an SDH / SONET type domain;
- la figure 3 représente l'établissement d'un tunnel réseau entre deux nœuds hybrides de bordure (des domaines SyncE respectifs) à travers un domaine de type SDH/SONET;  FIG. 3 represents the establishment of a network tunnel between two hybrid edge nodes (respective SyncE domains) across a SDH / SONET type domain;
- la figure 4 représente l'établissement de deux tunnels reliant deux domaines de type SyncE à travers un domaine de type SDH/SONET et ayant un nœud hybride de bordure destinataire commun;  FIG. 4 shows the establishment of two tunnels connecting two SyncE-type domains through an SDH / SONET-type domain and having a hybrid destination edge hybrid node;
- la figure 5 représente l'établissement de deux tunnels reliant deux domaines de type SyncE à travers un domaine de type SDH/SONET ayant un nœud hybride de bordure destinataire commun et ayant également un segment de parcours commun dans le domaine SDH/SONET;  FIG. 5 shows the establishment of two tunnels connecting two SyncE-like domains through an SDH / SONET-type domain having a common destination edge hybrid node and also having a common path segment in the SDH / SONET domain;
- la figure 6 représente les messages échangés entre le système de gestion de synchronisation (synchronisation management) et le nœud SI situé dans le domaine SONET/SDH d'une part et entre le système de gestion de synchronisation et le nœud hybride de bordure destinataire situé à l'interface du domaine SONET/SDH et du deuxième domaine SyncE d'autre part; Dans la description de ce qui va suivre, on désigne de façon générale: FIG. 6 shows the messages exchanged between the synchronization management system and the SI node located in the SONET / SDH domain on the one hand and between the synchronization management system and the recipient edge hybrid node situated on the other hand. at the interface of the SONET / SDH domain and the second SyncE domain on the other hand; In the description of what will follow, we designate in a general way:
Le terme « ESMC » correspond à l'acronyme anglais Ethernet Synchronisation Messaging Channel; The term "ESMC" refers to the acronym Ethernet Synchronization Messaging Channel;
Le terme « SONET » correspond à l'acronyme anglais Synchronous Optical Networking; Le terme « SDH » correspond à l'acronyme anglais Synchronous Digital Hierarchy; Le terme « TLV » correspond à l'acronyme anglais Type Length Value; Le terme « QL » correspond à l'acronyme anglais Quality Level; Le terme « SyncE » correspond à l'acronyme anglais Synchronous Ethernet; The term "SONET" corresponds to the acronym Synchronous Optical Networking; The term "SDH" corresponds to the acronym Synchronous Digital Hierarchy; The term "TLV" corresponds to the acronym Type Length Value; The term "QL" corresponds to the acronym Quality Level; The term "SyncE" corresponds to the acronym Synchronous Ethernet;
Le terme « encapsulation » correspond à une encapsulation au sens paquet dans laquelle le paquet est enveloppé dans une structure protocolaire (comportant en-tête, checksum, etc) de manière à permettre sa transmission dans un autre domaine géré par un protocole différent; Le terme « désencapsulation » désigne l'opération inverse à l'issue de laquelle on retrouve le paquet initial. The term "encapsulation" corresponds to encapsulation in the packet sense in which the packet is wrapped in a protocol structure (including header, checksum, etc.) so as to allow its transmission in another domain managed by a different protocol; The term "disencapsulation" refers to the inverse operation at the end of which we find the initial packet.
Les modes de réalisation de la présente invention correspondent à la transmission des messages ESMC dans un tunnel reliant deux domaines de type SyncE à travers un domaine de type SDH/SONET. Comme représentée sur la figure 3, la synchronisation peut être distribuée par des signaux physiques de synchronisation 11 d'un nœud hybride de bordure source 13 appartenant à un premier domaine SyncE vers un nœud hybride de bordure destinataire 15 appartenant à un deuxième domaine SyncE. Cette distribution se réalise de lien en lien au niveau de la couche physique à travers le domaine SONET/SDH. Les messages ESMC 17 sont, quant à eux, encapsulés au niveau du nœud hybride de bordure source 13, transmis à travers le domaine SONET/SDH 3 par le biais d'un tunnel réseau 19 associé au message ESMC puis désencapsulés au niveau du nœud hybride de bordure destinataire 15. Du fait de l'encapsulation, les messages ESMC 17 traversent le domaine SDH/SONET de manière transparente ce qui permet d'éviter le filtrage des champs TLV additionnels 7 aux interfaces SDH/SONET-SyncE. The embodiments of the present invention correspond to the transmission of ESMC messages in a tunnel connecting two SyncE-type domains through a SDH / SONET type domain. As shown in FIG. 3, the synchronization may be distributed by synchronization physical signals 11 of a source edge hybrid node 13 belonging to a first SyncE domain to a destination edge hybrid node belonging to a second SyncE domain. This distribution is realized of link in link at the level of the physical layer through the domain SONET / SDH. The ESMC messages 17 are, in turn, encapsulated at the hybrid source edge node 13, transmitted through the SONET / SDH domain 3 through a network tunnel 19 associated with the ESMC message and then désencapsulés at the hybrid node of Destination Border 15. As a result of encapsulation, the ESMC messages 17 traverse the SDH / SONET domain in a transparent manner, which makes it possible to avoid the filtering of the additional TLV fields 7 at the SDH / SONET-SyncE interfaces.
Par ailleurs, il est à noter que du fait que le tunnel réseau 19 associé aux messages ESMC traverse les nœuds SDH/SONET S de manière transparente, le chemin emprunté par ce tunnel n'est pas lié au chemin emprunté par les signaux de synchronisation 11. Néanmoins, il est recommandé que les chemins empruntés soient les mêmes, lorsque c'est possible, pour permettre une protection plus efficace en cas de reconfiguration du chemin de synchronisation due, par exemple, à une dégradation du signal primaire.  Furthermore, it should be noted that because the network tunnel 19 associated with the ESMC messages traverses the SDH / SONET nodes S transparently, the path taken by this tunnel is not related to the path taken by the synchronization signals 11 Nevertheless, it is recommended that the borrowed paths be the same, where possible, to provide more effective protection in case of reconfiguration of the synchronization path due, for example, to degradation of the primary signal.
Concernant l'information du niveau de qualité (QL), cette dernière est transmise normalement via Γ en-tête SONET/SDH, mais elle peut être, en plus, encapsulée avec les autres structures TLV et transmise au niveau paquet à travers le tunnel associé au message ESMC décrit précédemment. Dans ce cas, la valeur de QL extraite de la couche physique du domaine SDH/SONET peut être comparée à la valeur de QL encapsulée et en cas d'inconsistence entre les deux valeurs de QL, la valeur encapsulée est alors ignorée par le nœud hybride de bordure destinataire 15 et une alarme est envoyée au système de gestion de synchronisation (synchronisation management plane) afin de signaler une telle incohérence. For Quality of Information (QL) information, this is normally transmitted via the SONET / SDH header, but can also be encapsulated with other TLV structures and transmitted at the packet level through the associated tunnel. the ESMC message described previously. In this case, the value of QL extracted from the physical layer of the SDH / SONET domain can be compared to the encapsulated QL value and in case of inconsistency between the two QL values, the encapsulated value is then ignored by the hybrid node. 15 and an alarm is sent to the management synchronization system (synchronization management plane) to signal such an inconsistency.
La mise en place de tunnels 19 tels que décrits par la figure 3 peut conduire à la situation décrite à la figure 4 où deux tunnels distincts, ayant des parcours distincts, issus de deux nœuds hybrides de bordure sources 13 distincts et correspondant à deux chemins de distributions de synchronisation distincts ont un nœud hybride de bordure destinataire 15 commun. Dans un tel contexte, l'un des deux nœuds hybrides de bordure sources 13 correspond à la source de fréquence primaire et l'autre la source de fréquence secondaire. Dans ce cas, il est nécessaire de pouvoir distinguer les messages ESMC 17 issus des deux tunnels de manière à savoir quel message ESMC 17 correspond à quel signal de synchronisation 11 et par conséquent quelle source de synchronisation. The establishment of tunnels 19 as described in FIG. 3 can lead to the situation described in FIG. 4 where two distinct tunnels having distinct paths, originating from two hybrid source edge nodes 13 distinct and corresponding to two paths of distinct timing distributions have a common recipient edge hybrid node. In such a context, one of the two source edge hybrid nodes 13 corresponds to the primary frequency source and the other the secondary frequency source. In this case, it is necessary to be able to distinguish the ESMC messages 17 from the two tunnels so as to know which message ESMC 17 corresponds to which synchronization signal 11 and therefore which source of synchronization.
Ainsi, selon un mode de réalisation de la présente invention, l'un des champs TLV additionnels 9 est un champ permettant de distinguer deux tunnels ESMC 19. Ce champ peut, par exemple, être un champ TLV « identité de la source (source ID TLV) » comprenant une identification du nœud hybride de bordure source du tunnel ESMC 13 ou un champ « identité du tunnel (tunnel ID TLV) » comprenant une identification du tunnel 19 ou un champ « itinéraire du parcours (trace route) » comprenant une identification de l'ensemble des nœuds croisés par le message ESMC 17 ou une combinaison de ces trois champs. Dans le cas des champs « identité de la source » et « identité du tunnel », lesdits champs sont supprimés au niveau du nœud hybride de bordure destinataire 15. Thus, according to one embodiment of the present invention, one of the additional TLV fields 9 is a field that makes it possible to distinguish two ESMC tunnels 19. This field may, for example, be a TLV field "identity of the source (source ID TLV) "comprising an identification of the hybrid source edge node of the ESMC tunnel 13 or a tunnel identity (tunnel ID TLV) field comprising an identification of the tunnel 19 or a" route route (route trace) "field including an identification of all the nodes crossed by the message ESMC 17 or a combination of these three fields. In the case of the fields "source identity" and "tunnel identity", said fields are deleted at the destination hybrid node 15.
Une autre configuration présentée sur la figure 5 correspond à deux chemins de distribution de synchronisation, issus de deux sources de synchronisation différentes, ayant un nœud, voire un segment commun dans le domaine SDH/SONET 3. Ainsi, à la réception par un nœud du domaine SDH/SONET des signaux (physiques) de synchronisation provenant de deux nœuds hybrides de bordure sources 13 distincts, le nœud de type SDH/SONET recevant les deux distributions de synchronisation, noté SI, effectue une sélection entre les deux distributions et transmet le signal sélectionné vers le nœud hybride de bordure destinataire 15. Cette sélection est généralement effectuée en suivant les règles de priorité envoyées par le système de gestion de synchronisation, par exemple, par l'envoi d'une liste de priorité. En effet, dans le domaine SDH/SONET, la synchronisation est traditionnellement pilotée par le système de gestion de la synchronisation. Another configuration presented in FIG. 5 corresponds to two synchronization distribution paths, coming from two different synchronization sources, having a node, or even a common segment in the SDH / SONET domain 3. Thus, on reception by a node of the SDH / SONET domain synchronization (physical) signals from two distinct source edge hybrid nodes 13, the SDH / SONET type node receiving the two synchronization distributions, denoted by SI, selects between the two distributions and transmits the signal selected to the destination hybrid hybrid node 15. This selection is generally made according to the priority rules sent by the synchronization management system, for example, by sending a priority list. Indeed, in the SDH / SONET domain, the synchronization is traditionally controlled by the synchronization management system.
Cependant, en cas de dégradation (du niveau QL) ou d'échec du signal de synchronisation primaire, la re-sélection d'une nouvelle source de synchronisation se réalise localement au niveau du nœud SI : en comparant les valeurs de niveau de qualité « QL-TLV » contenues dans la trame SONET/SDH par exemple. Or, dans ce cas, le nœud hybride de bordure destinataire 15 ne peut connaître ni l'avènement ni le résultat de cette sélection lui permettant d'associer le chemin de synchronisation physique à l'information ESMC relative transportée au niveau paquet, à travers un tunnel réseau. However, in case of degradation (of the QL level) or failure of the primary synchronization signal, the re-selection of a new synchronization source is carried out locally at the node SI: by comparing the quality level values " QL-TLV "contained in the SONET / SDH frame for example. In this case, however, the hybrid destination edge node 15 can not know the advent or the result of this selection allowing it to associate the physical synchronization path with the ESMC information. relative transported at the packet level, through a network tunnel.
Afin d'annoncer au n ud hybride de bordure destinataire 15, l'identité de la source du signal de synchronisation primaire qui lui est transmis en cas d'une re-sélection, selon un mode de réalisation de la présente invention, un message de re-sélection (e.g. une alarme) est envoyé par le nœud SI au système de gestion de la synchronisation (synchronisation management) pour informer ce dernier du port physique lié au nouveau signal de synchronisation primaire 11 qui sera transmis vers le nœud hybride de bordure destinataire 15. Le système de gestion de la synchronisation est responsable par la suite de faire le lien entre l'information du port du nouveau signal primaire ainsi sélectionné au niveau du nœud SI et l'identité du nœud hybride de bordure source associé au nouveau signal de synchronisation ainsi sélectionné par SI; ceci en coopérant, par exemple, avec le système de gestion du réseau de transport SONET/SDH (en Anglais SONET/SDH network management). In order to announce to the recipient border hybrid node 15, the identity of the source of the primary synchronization signal which is transmitted to it in the event of a re-selection, according to an embodiment of the present invention, a message of re-selection (eg an alarm) is sent by the node SI to the synchronization management system (synchronization management) to inform the latter of the physical port linked to the new primary synchronization signal 11 which will be transmitted to the hybrid destination edge node 15. The synchronization management system is subsequently responsible for linking the port information of the new primary signal thus selected at the node SI and the identity of the source edge hybrid node associated with the new signal of synchronization thus selected by SI; this by cooperating, for example, with the SONET / SDH transport network management system (in English SONET / SDH network management).
En général, la sélection des sources de synchronisation au niveau du nœud SI est réalisée de manière automatique, au niveau du logiciel et non au niveau matériel. Par conséquent, il est assez aisé de mettre à jour le logiciel de manière à ajouter des instructions telles que l'envoi d'une alarme vers le système de gestion de la synchronisation. In general, the selection of synchronization sources at the node SI is performed automatically, at the software level and not at the hardware level. Therefore, it is quite easy to update the software to add instructions such as sending an alarm to the sync management system.
La figure 6 représente les différents signaux échangés avec le système de gestion de la synchronisation 21. FIG. 6 represents the different signals exchanged with the synchronization management system 21.
Au démarrage, le système de gestion de synchronisation 21 envoie au nœud SI un message de configuration 26 comprenant, par exemple, une liste de priorité afin de piloter localement le processus de sélection du signal de synchronisation parmi les signaux de synchronisation reçus sur les ports physiques 22 et 23. Le signal de synchronisation primaire sert à verrouiller l'horloge locale de l'équipement SI. Le présent scénario suppose que le signal de synchronisation primaire initialement sélectionné par le nœud SI est fourni par le port 22.  At startup, the synchronization management system 21 sends to the node SI a configuration message 26 including, for example, a priority list for locally controlling the process of selecting the synchronization signal among the synchronization signals received on the physical ports. 22 and 23. The primary synchronization signal is used to lock the local clock of the SI equipment. This scenario assumes that the primary synchronization signal initially selected by the SI node is provided by port 22.
En cas de dégradation du niveau de qualité ou de panne de ce signal primaire, le nœud SI procède à une re-sélection du signal primaire à partir du niveau de qualité des signaux reçus et de la liste de priorités. Dans le cas de la figure 6, le nouveau signal primaire est fourni par le port 23. Un message d'alarme 27, comprenant une identification du port physique 23, est alors envoyé au système de gestion de synchronisation 21. A partir de l'identification du port physique sélectionné 23, le système de gestion de la synchronisation 21 retrouve (grâce à une correspondance (en Anglais « mapping ») avec des connexions établies) l'identification du nœud hybride de bordure source 13 associé aussi appelé source (source ID). Un message 29, contenant l'identification du nœud hybride de bordure source (source ID) 13, est alors transmis au nœud hybride de bordure destinataire 15. Ce dernier peut alors sélectionner, parmi les tunnels ESMC 19 auxquels il est relié, le tunnel ESMC 19 correspondant à la source ainsi indiquée. In case of degradation of the quality level or failure of this primary signal, the node SI performs a re-selection of the primary signal from the quality level of the received signals and the list of priorities. In the case of Figure 6, the new primary signal is provided by the port 23. An alarm message 27, including an identification of the physical port 23, is then sent to the synchronization management system 21. From the identification of the selected physical port 23, the synchronization management system 21 finds (thanks to a correspondence (in English "mapping") with established connections) the identification of the hybrid source edge node 13 associated also called source (source ID ). A message 29, containing the identification of the source edge hybrid node (source ID) 13, is then transmitted to the hybrid destination edge node 15. The latter can then select, among the ESMC tunnels 19 to which it is connected, the ESMC tunnel. 19 corresponding to the source thus indicated.
Ce procédé permet donc au nœud hybride de bordure destinataire d'associer le tunnel associé au message ESMC à la source du signal primaire sélectionné. II est également à noter que les modes de réalisation présentés précédemment pour deux chemins de distribution de synchronisation physique peuvent se généraliser à plus de 2 chemins de distribution provenant de sources (de synchronisation) différentes, et les modes de sélection présentés peuvent être appliqués à un nombre quelconque de chemins de distribution de la fréquence de synchronisation.  This method therefore allows the destination edge hybrid node to associate the tunnel associated with the ESMC message with the source of the selected primary signal. It should also be noted that the embodiments presented above for two physical synchronization distribution paths may be generalized to more than 2 distribution paths from different (synchronization) sources, and the selection modes presented may be applied to a particular any number of distribution paths of the synchronization frequency.
Ainsi, les modes de réalisation de la présente invention permettent de transmettre des messages de type ESMC 17 comprenant des champs TLV additionnels 7 entre deux domaines SyncE 1 interconnectés par un domaine SDH/SONET 3 tout en évitant le filtrage des informations véhiculées par ces champs additionnels 7 à l'interface entre les domaines et en permettant au nœud hybride de bordure destinataire 15 d'associer les messages ESMC 17 reçus avec le signal de synchronisation primaire 11 reçu et donc d'utiliser ces messages de manière cohérente avec le signal physique de synchronisation primaire. Thus, the embodiments of the present invention make it possible to transmit messages of the ESMC type 17 comprising additional TLV fields 7 between two SyncE domains 1 interconnected by an SDH / SONET domain 3 while avoiding the filtering of the information conveyed by these additional fields. 7 at the interface between the domains and allowing the destination hybrid node 15 to associate the received ESMC messages with the received primary synchronization signal 11 and thus to use these messages in a manner consistent with the synchronization physical signal primary.

Claims

REVENDICATIONS
1. Procédé de transmission d'un message de type Ethernet Synchronisation Messaging Channel « ESMC » entre un premier et un deuxième domaine de type Synchronous Ethernet « SyncE », lesdits premier et deuxième domaines étant interconnectés par un troisième domaine de type Synchronous Optical Networking ou Synchronous Digital Hierarchy « SONET/SDH » dans lequel au moins une partie dudit message de type Ethernet Synchronisation Messaging Channel « ESMC » est encapsulée, à l'entrée dudit troisième domaine et désencapsulée à la sortie dudit troisième domaine de manière à créer un tunnel réseau à travers ce troisième domaine de type Synchronous Optical Networking/Synchronous Digital Hierarchy « SONET/SDH ». A method for transmitting an Ethernet Synchronization Messaging Channel message "ESMC" between a first and a second Synchronous Ethernet domain "SyncE", said first and second domains being interconnected by a third domain of the Synchronous Optical Networking type or Synchronous Digital Hierarchy "SONET / SDH" in which at least a portion of said Ethernet Synchronization Messaging Channel message "ESMC" is encapsulated at the input of said third domain and unencapsulated at the output of said third domain so as to create a network tunnel through this third domain of Synchronous Optical Networking / Synchronous Digital Hierarchy type "SONET / SDH".
2. Procédé de transmission d'un message de type Ethernet Synchronisation Messaging Channel « ESMC » selon la revendication 1 dans lequel ledit message comprend au moins un champ Type Length Value « TLV » différent du champ Quality Level « QL-TLV ». A method of transmitting an Ethernet Synchronization Messaging Channel message "ESMC" according to claim 1 wherein said message comprises at least one Type Length Value field "TLV" different from the Quality Level field "QL-TLV".
3. Procédé de transmission d'un message de type Ethernet Synchronisation Messaging Channel « ESMC » selon l'une des revendications précédentes dans lequel l'encapsulation et la désencapsulation des messages se font au niveau des nœuds hybrides Synchronous Ethernet-Synchronous Optical Networking/Synchronous Digital Hierarchy « SyncE-SONET/SDH » situés à l'interface des différents domaines. 3. Method for transmitting an Ethernet Messaging Channel synchronization message "ESMC" according to one of the preceding claims, in which the encapsulation and the decapsulation of the messages are done at the level of the Synchronous Ethernet-Synchronous Optical Networking / Synchronous hybrid nodes. Digital Hierarchy "SyncE-SONET / SDH" located at the interface of different domains.
4. Procédé de transmission d'un message de type Ethernet Synchronisation Messaging Channel « ESMC » selon la revendication 3 dans lequel un n ud hybride Synchronous Ethernet- Synchronous Optical Networking/Synchronous Digital Hierarchy « SyncE-SONET/SDH » reçoit 4. Method for transmitting an Ethernet synchronization type message Messaging Channel "ESMC" according to claim 3 wherein a Hychronous Synchronous Ethernet Synchronous Optical Networking / Synchronous Digital Hierarchy "SyncE-SONET / SDH" hybrid node
d'une part, au moins deux signaux de synchronisation distincts ayant parcourus des itinéraires distincts et provenant de nœuds hybrides de bordure sources distincts et, d'autre part, au moins deux messages de type Ethernet Synchronisation Messaging Channel « ESMC » distincts correspondant auxdits, au moins deux signaux de synchronisation, et issus de tunnels distincts, on the one hand, at least two distinct synchronization signals having traveled distinct routes and originating from separate source edge hybrid nodes and, on the other hand, at least two distinct Ethernet Messaging Channel Synchronization "ESMC" messages corresponding to said, at least two synchronization signals, and coming from separate tunnels,
dans lequel lesdits, au moins deux, messages comprennent un champ Type Length Value « TLV » additionnel permettant de distinguer les différents messages de type Ethernet Synchronisation Messaging Channel « ESMC ». wherein said at least two messages include an additional Type Length Value "TLV" field for distinguishing between different Ethernet Messaging Channel Synchronization "ESMC" messages.
5. Procédé de transmission d'un message de type Ethernet Synchronisation Messaging Channel « ESMC » selon la revendication 3 dans lequel un nœud de type Synchronous Optical Networking/Synchronous Digital Hierarchy « SONET/SDH » reçoit au moins deux signaux de synchronisation distincts ayant parcourus des itinéraires distincts et provenant de nœuds hybrides de bordure sources distincts, sélectionne le signal de synchronisation primaire à distribuer en fonction d'une liste de priorité fournie par un système de gestion de synchronisation, 5. A method of transmitting an Ethernet Messaging Channel Synchronous Message "ESMC" message according to claim 3 wherein a Synchronous Optical Networking / Synchronous Digital Hierarchy "SONET / SDH" type node receives at least two separate synchronization signals which have traveled separate routes from separate source edge hybrid nodes, selects the primary timing signal to be distributed based on a priority list provided by a timing management system,
et dans lequel, en cas de dégradation du signal de synchronisation primaire et de resélection du signal de synchronisation primaire, un message comprenant une identification du nouveau signal de synchronisation primaire sélectionné est transmis au système de gestion de synchronisation, and wherein, in case of degradation of the primary synchronization signal and reselection of the primary synchronization signal, a message comprising an identification of the new selected primary synchronization signal is transmitted to the synchronization management system,
ledit système de gestion de synchronisation transmettant alors, au nœud hybride Synchronous Ethernet-Synchronous Optical Networking/Synchronous Digital Hierarchy « SyncE-SONET/SDH » destinataire, une identification de la source de synchronisation correspondant au signal de synchronisation sélectionné afin de permettre au nœud hybride de bordure destinataire de considérer le tunnel encapsulant le message Ethernet Synchronisation Messaging Channel « ESMC » associé au signal de synchronisation primaire sélectionné. said synchronization management system then transmits to the recipient Synchronous Ethernet-Synchronous Optical Networking / Synchronous Digital Hierarchy (SyncE-SONET / SDH) hybrid node an identification of the synchronization source corresponding to the selected synchronization signal to enable the hybrid node recipient edge to consider encapsulating tunnel the Ethernet Synchronization Messaging Channel message "ESMC" associated with the selected primary synchronization signal.
6. Procédé de transmission d'un message de type Ethernet Synchronisation Messaging Channel « ESMC » selon l'une des revendications 2 à 5 dans lequel le, au moins un, champ Type Length Value « TLV » additionnel indique le niveau de stabilité de la fréquence fournie par la source de fréquence. A method of transmitting an Ethernet Synchronization Messaging Channel message "ESMC" according to one of claims 2 to 5, wherein the, at least one additional Type Length Value field "TLV" indicates the level of stability of the frequency provided by the frequency source.
7. Procédé de transmission d'un message de type Ethernet Synchronisation Messaging Channel « ESMC » selon l'une des revendications 2 à 6 dans lequel le, au moins un, champ Type Length Value « TLV » additionnel indique le nombre de nœuds traversés par ledit message depuis son nœud source. A method for transmitting an Ethernet Synchronization Messaging Channel message "ESMC" according to one of claims 2 to 6, wherein the at least one additional Type Length Value field "TLV" indicates the number of nodes traversed by said message from its source node.
8. Procédé de transmission d'un message de type Ethernet Synchronisation Messaging Channel « ESMC » selon l'une des revendications 2 à 7 dans lequel le, au moins un, champ Type Length Value « TLV » additionnel comprend une identification des nœuds traversés par ledit message. A method for transmitting an Ethernet Synchronization Messaging Channel message "ESMC" according to one of claims 2 to 7, in which the at least one additional Type Length Value "TLV" field comprises an identification of the nodes traversed by said message.
9. Procédé de transmission d'un message de type Ethernet Synchronisation Messaging Channel « ESMC » selon l'une des revendications précédentes dans lequel le tunnel associé au message Ethernet Synchronisation Messaging Channel « ESMC » du domaine Synchronous Optical Networking/Synchronous Digital Hierarchy « SONET/SDH » suit le même itinéraire que le signal de synchronisation. 9. Method for transmitting an Ethernet Messaging Channel Synchronization "ESMC" message according to one of the preceding claims, in which the tunnel associated with the Messaging Channel Synchronous Optical Networking / Synchronous Digital Hierarchy Messaging Channel "ESMC" Digital Hierarchy "SONET / SDH "follows the same route as the sync signal.
10. Procédé de transmission d'un message de type Ethernet Synchronisation Messaging Channel « ESMC » selon l'une des revendications précédentes dans lequel le tunnel associé au message Ethernet Synchronisation Messaging Channel « ESMC » du domaine Synchronous Optical Networking/Synchronous Digital Hierarchy « SONET/SDH » suit un itinéraire différent du signal de synchronisation. 10. Method for transmitting an Ethernet Messaging Channel Synchronization "ESMC" message according to one of the preceding claims, in which the tunnel associated with the Messaging Channel Synchronous Optical Networking / Synchronous Digital Hierarchy Messaging Channel message. "SONET / SDH" follows a different route from the sync signal.
11. Nœud hybride Synchronous Ethernet-Synchronous Optical Networking/Synchronous Digital Hierarchy « SyncE-SONET/SDH » comprenant des moyens d'encapsulation d'un message de type Ethernet Synchronisation Messaging11. Hybrid Synchronous Ethernet-Synchronous Optical Networking / Synchronous Digital Hierarchy node "SyncE-SONET / SDH" including means for encapsulation of an Ethernet-type message Synchronization Messaging
Channel « ESMC » qui comporte au moins un champ Type Length Value « TLV » différent du champ Quality Level, appelé « QL-TLV ». Channel "ESMC" which has at least one Type Length Value field "TLV" different from the Quality Level field, called "QL-TLV".
12. Nœud hybride Synchronous Ethernet-Synchronous Optical Networking/Synchronous Digital Hierarchy « SyncE-SDH/SONET » comprenant12. Synchronous Ethernet Synchronous-Synchronous Optical Networking / Synchronous Digital Hierarchy Synchronous Node "SyncE-SDH / SONET" comprising
- des moyens de réception aptes à recevoir au moins un message de type Ethernet Synchronisation Messaging Channel « ESMC » comportant au moins un champ Type Length Value « TLV » différent du champ Quality Level « QL-TLV » encapsulé pour être transmis à travers un domaine de type Synchronous Optical Networking/Synchronous Digital Hierarchy « SONET/SDH » et, reception means capable of receiving at least one Ethernet Synchronization Messaging Channel message "ESMC" comprising at least one Type Length Value field "TLV" different from the Quality Level field "QL-TLV" encapsulated for transmission through a domain Synchronous Optical Networking / Synchronous Digital Hierarchy "SONET / SDH" and,
- des moyens de désencapsulation dudit message et des moyens de lecture des champs Type Length Value « TLV ».  means for de-encapsulation of said message and means for reading the Type Length Value fields "TLV".
13. Nœud de type Synchronous Optical Networking/Synchronous Digital Hierarchy « SDH/SONET » comprenant 13. Synchronous Optical Networking / Synchronous Digital Hierarchy-type node "SDH / SONET" comprising
- des moyens de réception des signaux de synchronisation destinés à un domaine de type Synchronous Ethernet « SyncE »,  means for receiving the synchronization signals intended for a Synchronous Ethernet "SyncE" type domain,
- des moyens de sélection desdits signaux de synchronisation en fonction d'une liste de priorités fournie par un système de gestion de synchronisation ou en fonction des valeurs de niveau de qualité « QL » contenues dans la trame SONET/SDH en cas de dégradation du signal de synchronisation primaire définie à la fois par la liste de priorités et les QLs des signaux de synchronisation disponibles et  means for selecting said synchronization signals according to a list of priorities provided by a synchronization management system or as a function of the quality level values "QL" contained in the SONET / SDH frame in the event of signal degradation primary synchronization defined by both the priority list and the QLs of available synchronization signals and
- des moyens de transmission d'un message d'alarme vers ledit système de gestion de synchronisation indiquant les informations identifiant le port physique associé au nouveau signal de synchronisation transmis vers le domaine de type Synchronous Ethernet « SyncE » en cas d'échec du signal de synchronisation primaire initial. means for transmitting an alarm message to said management system of synchronization indicating the information identifying the physical port associated with the new synchronization signal transmitted to the synchronous Ethernet type domain "SyncE" in case of failure of the initial primary synchronization signal.
14. Système de gestion de synchronisation comprenant 14. Synchronization management system including
- des moyens d'établissement et de configuration d'une liste de priorité de signaux de synchronisation destinés à être distribués d'un premier domaine de type Synchronous Ethernet « SyncE » vers un deuxième domaine de type Synchronous Ethernet « SyncE » à travers un troisième domaine de type Synchronous Optical Networking/Synchronous Digital Hierarchy « SONET/SDH »,  means for establishing and configuring a synchronization signal priority list intended to be distributed from a first Synchronous Ethernet "SyncE" domain to a second Synchronous Ethernet "SyncE" domain through a third Synchronous Optical Networking / Synchronous Digital Hierarchy Domain "SONET / SDH",
- des moyens de transmission de ladite liste aux n uds dudit domaine Synchronous Optical Networking/Synchronous Digital Hierarchy « SONET/SDH »,  means for transmitting said list to the nodes of said Synchronous Optical Networking / Synchronous Digital Hierarchy domain "SONET / SDH",
- des moyens de réception d'un message d'alarme émis par un noeud du domaine SONET/SDH indiquant l'identité du nouveau port associé au nouveau signal de synchronisation primaire sélectionné,  means for receiving an alarm message sent by a node of the SONET / SDH domain indicating the identity of the new port associated with the new selected primary synchronization signal,
- des moyens pour réaliser la corrélation entre l'identité du nouveau port associé au nouveau signal de synchronisation primaire, et le tunnel encapsulant les messages de type Ethernet Synchronisation Messaging Channel « ESMC » associé au nouveau signal primaire,  means for correlating the identity of the new port associated with the new primary synchronization signal, and the tunnel encapsulating the Ethernet Synchronization Messaging Channel "ESMC" messages associated with the new primary signal,
des moyens de transmission, vers le n ud hybride destinataire Synchronous Ethernet-Synchronous Optical Networking/Synchronous Digital Hierarchy « SyncE- SONET/SDH », situé à l'interface du deuxième et du troisième domaine, d'un message indiquant l'identité du tunnel encapsulant le message de type Ethernet Synchronisation Messaging Channel « ESMC » à considérer.  means for transmitting a message indicating the identity of the receiver to the Synchronous Ethernet-Synchronous Optical Networking / Synchronous Digital Hierarchy "SyncE-SONET / SDH" hybrid destination node at the interface of the second and third domains; tunnel encapsulating the message type Ethernet Synchronization Messaging Channel "ESMC" to consider.
EP11729611.1A 2010-06-30 2011-06-30 Method for transmitting an esmc message through a sonet/sdh domain Withdrawn EP2589170A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1002753A FR2962282B1 (en) 2010-06-30 2010-06-30 METHOD FOR TRANSMITTING ESMC TYPE MESSAGE THROUGH A SONET / SDH DOMAIN
PCT/EP2011/061025 WO2012001113A1 (en) 2010-06-30 2011-06-30 Method for transmitting an esmc message through a sonet/sdh domain

Publications (1)

Publication Number Publication Date
EP2589170A1 true EP2589170A1 (en) 2013-05-08

Family

ID=43568019

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11729611.1A Withdrawn EP2589170A1 (en) 2010-06-30 2011-06-30 Method for transmitting an esmc message through a sonet/sdh domain

Country Status (7)

Country Link
US (1) US20130107897A1 (en)
EP (1) EP2589170A1 (en)
JP (1) JP5466791B2 (en)
KR (1) KR101550510B1 (en)
CN (1) CN103026645B (en)
FR (1) FR2962282B1 (en)
WO (1) WO2012001113A1 (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2962279B1 (en) * 2010-06-30 2013-03-15 Alcatel Lucent TIME DISTRIBUTION METHOD IN SYNCHRONOUS ETHERNET AND SONET / SDH DOMAINS
WO2015010337A1 (en) 2013-07-26 2015-01-29 华为终端有限公司 Synchronization signal bearing method and user equipment
CN104813625B (en) * 2013-07-26 2017-04-19 华为终端有限公司 Synchronization signal bearing method and user equipment
JP2015211247A (en) * 2014-04-24 2015-11-24 Ｎｅｃエンジニアリング株式会社 Network device and network system
US9608751B2 (en) 2015-03-18 2017-03-28 Accedian Networks Inc. Simplified synchronized Ethernet implementation
CN106163037B (en) 2015-04-17 2019-12-20 朗德万斯公司 Light emitting diode driving circuit and light emitting diode lighting apparatus
CN110581731B (en) * 2018-06-11 2022-03-11 台达电子工业股份有限公司 Intelligent definition optical tunnel network system and network system control method
US10615902B2 (en) 2018-06-11 2020-04-07 Delta Electronics, Inc. Intelligence-defined optical tunnel network system and network system control method
US10931393B2 (en) 2018-06-11 2021-02-23 Delta Electronics, Inc. Intelligence-defined optical tunnel network system and network system control method
US10868662B2 (en) 2018-11-30 2020-12-15 Ciena Corporation Virtualized synchronous Ethernet interfaces
US11196500B1 (en) * 2020-07-23 2021-12-07 Cisco Technology, Inc. Continuance in quality level of an input timing signal

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9605013D0 (en) * 1996-03-08 1996-05-08 Northern Telecom Ltd Network synchronisation
US6711411B1 (en) * 2000-11-07 2004-03-23 Telefonaktiebolaget Lm Ericsson (Publ) Management of synchronization network
DE102004050416A1 (en) * 2004-10-15 2006-04-27 Bosch Rexroth Ag Method for synchronization in a redundant communication system
KR20070070299A (en) * 2005-07-06 2007-07-04 삼성전자주식회사 Time synchronous method in residential ethernet system
US20090016384A1 (en) * 2007-07-12 2009-01-15 Tellabs Operations, Inc. Method and apparatus for distributing synchronization status messages over a Resilient Packet Ring (RPR)
WO2011060965A1 (en) * 2009-11-19 2011-05-26 Telefonaktiebolaget L M Ericsson (Publ) Configuration of synchronisation network
JP5480977B2 (en) * 2009-12-17 2014-04-23 テレフオンアクチーボラゲット エル エム エリクソン（パブル） Synchronization network configuration with synchronization trail for time synchronization and frequency synchronization

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2012001113A1 *

Also Published As

Publication number Publication date
CN103026645B (en) 2017-06-09
US20130107897A1 (en) 2013-05-02
KR101550510B1 (en) 2015-09-18
JP5466791B2 (en) 2014-04-09
FR2962282B1 (en) 2012-07-13
CN103026645A (en) 2013-04-03
JP2013535168A (en) 2013-09-09
KR20130051471A (en) 2013-05-20
WO2012001113A1 (en) 2012-01-05
FR2962282A1 (en) 2012-01-06

Similar Documents

Publication Publication Date Title
WO2012001113A1 (en) Method for transmitting an esmc message through a sonet/sdh domain
US10419152B2 (en) Communication network employing network devices with packet delivery over pre-assigned optical channels
US7773539B2 (en) Method for separation of IP+optical management domains
US20030048746A1 (en) Metropolitan area local access service system
EP0490315A1 (en) Method for permanently ensuring the synchronisation of the nodes of a private telecommunication network to the best available clock, and corresponding network
US20120269093A1 (en) Neighbor Discovery for Ethernet Private Line on User Network Interfaces
CN101145839A (en) Method and device for monitoring sub-network connection protection of k-rank optical channel data unit sub-layer
EP0734131B1 (en) Method for administrating an optical ring with wavelength multiplexing
CN108989177A (en) A kind of method of the Packet Service configuration of POTN equipment
CA2453079A1 (en) Optical wavekey network and a method for distributing management information therein
WO2012001114A1 (en) Method for time distribution in synchronous ethernet and sonet/sdh domains
CN101119161B (en) Fail processing system and method of transmission equipment
KR20130025889A (en) Signaling control method and system for service establishment based on g.709
EP1494383B1 (en) WDM optical ring network for signal transmission protected by local state switching caused by local detection of interrutpion
US8699524B2 (en) Method and apparatus for generating resize control overhead in optical transport network
EP1696639B1 (en) Failure management and propagation in a telecommunication network
WO2016086615A1 (en) Ethernet ring network protection method and device
US9762340B1 (en) Synchronization timing loop detection systems and methods
FR2958490A1 (en) METHOD FOR CONTROLLING THE ESTABLISHMENT OF A CONNECTION IN A TRANSPORT NETWORK
CN102624603B (en) Obtain ODUflex and connect the method and device of required branch road timeslot number
FR2941116A1 (en) METHOD AND EQUIPMENT FOR DISTRIBUTING A FREQUENCY REFERENCE IN A HETEROGENEOUS NETWORK
Gee et al. 10G LAN PHY over G. 709 OTN: A Service Provider Prospective
EP1385287B1 (en) Apparatus for multiplexing and routing payloads in synchronous transfer mode or synchronous streams
FR2835990A1 (en) SYSTEM AND METHOD FOR DATA TRANSMISSION THROUGH A SYNCHRONOUS NETWORK
FR2721464A1 (en) Parity bit control word correction method e.g. for SDH transmission system

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20130130

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

111Z Information provided on other rights and legal means of execution

Free format text: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

Effective date: 20130410

DAX Request for extension of the european patent (deleted)
RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: ALCATEL LUCENT

D11X Information provided on other rights and legal means of execution (deleted)
17Q First examination report despatched

Effective date: 20161026

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: ALCATEL LUCENT

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20180306