EP2589169A1 - Method for time distribution in synchronous ethernet and sonet/sdh domains - Google Patents
Method for time distribution in synchronous ethernet and sonet/sdh domainsInfo
- Publication number
- EP2589169A1 EP2589169A1 EP11729113.8A EP11729113A EP2589169A1 EP 2589169 A1 EP2589169 A1 EP 2589169A1 EP 11729113 A EP11729113 A EP 11729113A EP 2589169 A1 EP2589169 A1 EP 2589169A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- synchronous
- message
- domain
- value
- ethernet
- 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- Withdrawn
Links
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 91
- 238000000034 method Methods 0.000 title claims abstract description 16
- RGNPBRKPHBKNKX-UHFFFAOYSA-N hexaflumuron Chemical compound C1=C(Cl)C(OC(F)(F)C(F)F)=C(Cl)C=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F RGNPBRKPHBKNKX-UHFFFAOYSA-N 0.000 title description 36
- 230000003287 optical effect Effects 0.000 claims abstract description 30
- 230000006855 networking Effects 0.000 claims abstract description 29
- 238000013507 mapping Methods 0.000 claims description 9
- 230000004048 modification Effects 0.000 claims description 3
- 238000012986 modification Methods 0.000 claims description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 9
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0075—Arrangements for synchronising receiver with transmitter with photonic or optical means
-
- 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
-
- 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
- H04J3/0658—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
- Embodiments of the present invention relate to the field of communication networks and more particularly to the distribution of time between two Synchronous Ethernet (SyncE) domains interconnected by a Synchronous Optical Networking / Synchronous Digital Hierarchy (SONET / SDH) type domain.
- Synchronous Ethernet Synchronous Ethernet
- SONET / SDH Synchronous Digital Hierarchy
- the domains SONET / SDH and SyncE are compatible from the point of view of the physical distribution of a synchronization frequency as represented in FIG.
- nodes of the Synchronized Ethernet (syncE) type E (fig.lb) or hybrid H (fig.lc), that is having both the SONET / SDH and SyncE interfaces, are inserted in a synchronization chain comprising SONET / SDH type nodes and synchronization units (Synchronization Supply Unit) SSU.
- TLV Type Length Value
- ITU-T International Telecommunications Union
- QL-TLV Quality Level
- TLV type structures comprising a timestamp value so that distribute time through a SyncE domain.
- the embodiments of the present invention relate to a time distribution method between a first and a second Synchronous Ethernet domain "SyncE", said first and second domains being interconnected by a third domain of Synchronous Optical Networking / Synchronous type.
- Digital Hierarchy "SDH-SONET” in which a time-related repository parameter is distributed, through Synchronous Ethernet “SyncE” domains, through at least one additional Type Length Value "TLV" field of a Ethernet Message Synchronization Messaging Channel "ESMC” and a corresponding time-related repository parameter is distributed, through the Synchronous Optical Networking / Synchronous Digital Hierarchy type domain "SONET-SDH” via at least one Type Length Value field Additional "TLV" at an IEEE 1588 V2 protocol message.
- the message of the IEEE 1588 protocol in which a time-related repository parameter is distributed, through Synchronous Ethernet “SyncE” domains, through at least one additional Type Length Value "TLV” field of a Ethernet Message Synchron
- V2 is a SYNC message.
- the message of the protocol IEEE 1588 V2 is an ANNOUNCE message.
- the time associated repository parameter distributed over Synchronous Ethernet "SyncE" domains comprises at least one timestamp value.
- the referential parameter associated with the corresponding time and distributed through the Synchronous Optical Net type domain orking / Synchronous Digital Hierarchy "SONET-SDH" includes a timestamp value.
- a mapping of at least one additional Type Length Value field "TLV" of the Ethernet Synchronization Messaging Channel "ESMC" message received to the IEEE1588V2 protocol message is performed at the node level. hybrid source edge by the synchronization network manager so as to allow a modification of the value of said at least one additional Type Length Value field "TLV" of the IEEE 1588 V2 protocol message by the nodes of the domain Synchronous Optical Networking / Synchronous Digital Hierarchy "SONET-SDH".
- the message of the IEEE1588V2 protocol is encapsulated in a Multiprotocol Label Switching "MPLS" type tunnel.
- MPLS Multiprotocol Label Switching
- IEEE1588V2 is encapsulated in a Virtual Local Area Network "VLAN" type tunnel.
- the tunnel carrying the message of the IEEE 1588 V2 protocol follows the same route as the tuning signal transmitted on the physical layer.
- a mapping of at least one additional Type Length Value "TLV" field of the received IEEE1588V2 protocol message to the Messaging Channel Synchronization Ethernet "ESMC" message is performed at the hybrid node. destination border by the synchronization network manager.
- the time associated repository parameter distributed through the Synchronous Ethernet "SyncE” domains includes a master clock value of the SyncE domain.
- the referential parameter associated with the corresponding time and distributed through the Synchronous Optical Networking / Synchronous Digital Hierarchy type domain "SONET-SDH” comprises an offset value between a master clock of the Synchronous Ethernet domain " SyncE "and a master clock from the Synchronous Optical Networking / Synchronous Digital Hierarchy domain" SONET-SDH ".
- the value of the clock offset is determined at the hybrid source edge node. According to a further aspect of the present invention, the message of the type
- ANNOUNCE is encapsulated in a Multiprotocol Label Switching "MPLS" type tunnel.
- MPLS Multiprotocol Label Switching
- the value of the master clock of the first Synchronous Ethernet domain "SyncE” is retrieved at the destination hybrid edge node from the value of the master clock of the domain Synchronous Optical Networking / Synchronous Digital Hierarchy "SONET-SDH” and the offset value transmitted by the ANNOUNCE message.
- a mapping of the TLV fields of the Ethernet Synchronization Messaging Channel message "ESMC" to the new TLV fields of the ANNOUNCE message is performed so as to allow these fields to be updated at the nodes from the SONET / SDH domain.
- ESMC Messaging Channel Synchronization Ethernet message
- TLV Type Length Value field
- Embodiments of the present invention also relate to a destination edge hybrid node including means configured to:
- Type Length Value "TLV” fields of the transmitted SYNC or ANNOUNCE message at least one of which is associated with a master clock value with Type Length Value fields "TLV” of an Ethernet message Synchronization Messaging Channel "ESMC"
- Ethernet Synchronization Messaging Channel message "ESMC” including the Type Length Value “TLV” fields of which at least one is associated with a master clock value through a Synchronous Ethernet "SyncE” domain.
- ESMC Messaging Channel Synchronization Ethernet message
- TLV Type Length Value
- 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 time distribution means in the fields presented in FIG. 2;
- FIG. 4 represents a time distribution in which a timestamp value obtained by matching the value received at the level of an additional TLV field of an ESMC message is transmitted by an additional TLV field of a message.
- FIG. 5 represents a time distribution in which a clock offset value obtained by comparing the master clocks of the SyncE and SONET / SDH domains is transmitted by an additional TLV field of a ANNOUNCE type message in the SONET / domain.
- SDH through a MPLS tunnel;
- ESMC Ethernet Synchronization Messaging Channel
- IEEE Institute of Electrical and Electronic Engineers
- 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
- MPLS refers to the acronym Multi Protocol Label Switching
- encapsulation corresponds to encapsulation in the packet sense in which the packet is integrated 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.
- hybrid edge node refers to a node at the junction between two domains (i.e., between a SONET / SDH domain and a SyncE domain in this case) and includes both SONET interfaces. / SDH and SyncE.
- Embodiments of the present invention relate to the time distribution between two SyncE domains interconnected by a SONET / SDH domain by using an additional Type Length Value field transmitted at an ESMC message in the SyncE domains and integrated into a message.
- SYNC or ANNOUNCE type of the IEEE1588V2 protocol at the SONET / SDH domain level.
- FIG. 3 corresponds to the configuration presented in FIG. 2, the time reference is distributed by the additional TLV fields 7 at the level of the SyncE domains 1 and at the level of a message 11 (of the SYNC (or ANNOUNCE) type) of the protocol 1588V2 at the SONET / SDH domain level 3.
- NTP Network Time Protocol
- time can be distributed by timestamp values
- the ESMC extensions and in particular a time stamp value transported by an additional TLV field 7 is received by a source edge hybrid node H located at the interface between a SyncE domain. 1 and a SONET / SDH domain 3.
- a mapping is then performed by the hybrid node in order to transpose the additional fields TLV 7 of the message ESMC 5 to a message of the SYNC (or ANNON) type 11 of the IEEE1588V2 protocol intended to be transmitted through the SONET / SDH domain 3.
- This mapping makes it possible, if necessary (as for example in the case of counter count of number of nodes encountered ("hop count" in English)), an update of the additional fields TLV 7 of the message 11 of the IEEE1588V2 protocol by the nodes S of the SONET / SDH domain 3.
- the IEEE1588V2 message 11 must follow the route of the tuning signals 23 transmitted on the physical layer (the SYNC (or ANNOUNCE) message being transmitted on the packet layer).
- This constraint is ensured by the establishment of a tunnel 19, for example of the Multi Protocol Label Switching (MPLS) or Virtual Local Area Network (VLAN) type, towards the hybrid destination edge node 21 and following the route of the signaling signals. tuning 23.
- MPLS Multi Protocol Label Switching
- VLAN Virtual Local Area Network
- the source edge hybrid node 13 receives information from the network manager and synchronization network manager 17 which enables it to establish said tunnel 19 (this information is also transmitted to the hybrid destination edge node 21 ).
- the message rate SYNC (or ANNOUNCE) 11 must be set to be at least equal to the heartbeat period (ESMC).
- the fields TLV as for example the fields corresponding to the number of nodes met ("hop count number”) or plot ("trace route”) , are updated, the proposed solution thus allowing the transmission of different types of TLV fields.
- the receiving edge hybrid node H 21 upon receiving a SYNC (or ANNOUNCE) message 11, an inverse mapping of the mapping 15 performed at the source edge hybrid node 13 is performed, which makes it possible to transpose the TLV fields of the SYNC (or ANNOUNCE) message to an ESMC message 5 in order to be transmitted through the second SyncE domain 1.
- the TLV fields of a received ESMC message include in particular a master clock value Tin (t) of the SyncE domain 1. This value is then compared to the value of the master clock Tref (t).
- T_offset (t) Tin (t) -Tref (t)) between the two master clocks.
- the offset value T_offset is then encoded at the source edge hybrid node 13 and inserted into a new TLV field of an ANNOUNCE message 12 of the IEEE 1588V2 protocol.
- a mapping of the TLV fields of the ESMC message to the new TLV fields of the ANNOUNCE 12 message can also be performed so as to allow these fields to be updated at the nodes of the SONET / SDH domain 3.
- Said message is then encapsulated in a tunnel 19, for example of the MPLS type to be transmitted to the hybrid destination edge node 21.
- the two master clock values (Tin (t) and Tref (t)) can also be transmitted in the TLV field instead of the offset value.
- the reference time of the master clock of the SyncE domain (Tin (t + ôt)) is retrieved from the value of the master clock of the SONET / SDH domain 3 distributed by the protocol 1588V2 (Tref (t + ôt)) and the clock offset transmitted by the message ANNOUNCE 12 (T_offset (t)):
- Tin (t + Ot) Tref (t + Ot) + T_offset (t)
- the clock offset value can be transmitted through the SONET / SDH domain 3 by a reserved field of an ANNOUNCE message.
- the time distribution can then be made through the second SyncE domain 1 through ESMC messages 5.
- the embodiments of the present invention make it possible to transmit the time between a first and a second SyncE domain interconnected by a SONET / SDH domain by using the additional TLV fields of the SyncE domain-level ESMC messages and the SYNC or ANNOUNCE messages of the 1588V2 protocol at the SONET / SDH domain level.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Time-Division Multiplex Systems (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1002755A FR2962279B1 (en) | 2010-06-30 | 2010-06-30 | TIME DISTRIBUTION METHOD IN SYNCHRONOUS ETHERNET AND SONET / SDH DOMAINS |
PCT/EP2011/061027 WO2012001114A1 (en) | 2010-06-30 | 2011-06-30 | Method for time distribution in synchronous ethernet and sonet/sdh domains |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2589169A1 true EP2589169A1 (en) | 2013-05-08 |
Family
ID=43425880
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11729113.8A Withdrawn EP2589169A1 (en) | 2010-06-30 | 2011-06-30 | Method for time distribution in synchronous ethernet and sonet/sdh domains |
Country Status (7)
Country | Link |
---|---|
US (1) | US9264212B2 (en) |
EP (1) | EP2589169A1 (en) |
JP (1) | JP5653518B2 (en) |
KR (1) | KR101492747B1 (en) |
CN (1) | CN103026646B (en) |
FR (1) | FR2962279B1 (en) |
WO (1) | WO2012001114A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2779489B1 (en) * | 2013-03-12 | 2019-11-27 | Alcatel Lucent | Method for selecting a network clock of a local synchronization domain of a mobile network as a frequency synchronization gateway |
US9608751B2 (en) | 2015-03-18 | 2017-03-28 | Accedian Networks Inc. | Simplified synchronized Ethernet implementation |
US10868662B2 (en) * | 2018-11-30 | 2020-12-15 | Ciena Corporation | Virtualized synchronous Ethernet interfaces |
CN111147179A (en) * | 2020-03-10 | 2020-05-12 | 浙江赛思电子科技有限公司 | E1-based precise clock synchronization technology |
US11411666B2 (en) * | 2020-05-19 | 2022-08-09 | Juniper Networks, Inc. | Clock fault detection and correction between synchronized network devices |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3775859B2 (en) * | 1996-07-05 | 2006-05-17 | 富士通株式会社 | Path switch ring controller in synchronous (SDH) network including asynchronous (PDH) subnetwork |
DE19937088A1 (en) * | 1999-08-06 | 2001-02-15 | Alcatel Sa | Method for synchronizing time information |
JP2004221952A (en) * | 2003-01-15 | 2004-08-05 | Fujitsu Ltd | Transmission method and transmitter |
CN101247168B (en) * | 2007-02-15 | 2012-04-25 | 华为技术有限公司 | Time synchronization method and system |
JP2008271206A (en) * | 2007-04-20 | 2008-11-06 | Nec Corp | Sdh/ip device, cross connect device and communication method |
CN101299749B (en) * | 2007-04-30 | 2011-12-07 | 华为技术有限公司 | Method and apparatus for transferring clock between networks |
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) |
JP5298544B2 (en) * | 2008-01-30 | 2013-09-25 | 日本電気株式会社 | Wireless transmission apparatus and wireless transmission method |
US8902932B2 (en) * | 2008-10-02 | 2014-12-02 | Cortina Systems, Inc. | Systems and methods for a network device to update timing packets to reflect delay |
CN102415025B (en) * | 2009-04-21 | 2014-06-25 | 阿尔卡特朗讯公司 | ADD and DROP elements for ntp on-path-support and method for inter-operating between ntp and IEEE-1588 protocol domains |
US8446896B2 (en) * | 2010-04-21 | 2013-05-21 | Lsi Corporation | Time synchronization using packet-layer and physical-layer protocols |
FR2962282B1 (en) * | 2010-06-30 | 2012-07-13 | Alcatel Lucent | METHOD FOR TRANSMITTING ESMC TYPE MESSAGE THROUGH A SONET / SDH DOMAIN |
-
2010
- 2010-06-30 FR FR1002755A patent/FR2962279B1/en active Active
-
2011
- 2011-06-30 JP JP2013517299A patent/JP5653518B2/en not_active Expired - Fee Related
- 2011-06-30 WO PCT/EP2011/061027 patent/WO2012001114A1/en active Application Filing
- 2011-06-30 KR KR1020137002409A patent/KR101492747B1/en not_active IP Right Cessation
- 2011-06-30 US US13/806,212 patent/US9264212B2/en not_active Expired - Fee Related
- 2011-06-30 CN CN201180036306.7A patent/CN103026646B/en not_active Expired - Fee Related
- 2011-06-30 EP EP11729113.8A patent/EP2589169A1/en not_active Withdrawn
Non-Patent Citations (2)
Title |
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None * |
See also references of WO2012001114A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2962279A1 (en) | 2012-01-06 |
KR101492747B1 (en) | 2015-02-23 |
US9264212B2 (en) | 2016-02-16 |
KR20130033423A (en) | 2013-04-03 |
WO2012001114A1 (en) | 2012-01-05 |
CN103026646B (en) | 2016-04-13 |
FR2962279B1 (en) | 2013-03-15 |
US20130121705A1 (en) | 2013-05-16 |
JP2013534109A (en) | 2013-08-29 |
CN103026646A (en) | 2013-04-03 |
JP5653518B2 (en) | 2015-01-14 |
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