WO2002017545A2 - Systeme et procede de partage de la largeur de bande nxsts-1 et de protection d'anneau - Google Patents

Systeme et procede de partage de la largeur de bande nxsts-1 et de protection d'anneau Download PDF

Info

Publication number
WO2002017545A2
WO2002017545A2 PCT/US2001/026542 US0126542W WO0217545A2 WO 2002017545 A2 WO2002017545 A2 WO 2002017545A2 US 0126542 W US0126542 W US 0126542W WO 0217545 A2 WO0217545 A2 WO 0217545A2
Authority
WO
WIPO (PCT)
Prior art keywords
ring
nxsts
manager
node
primary
Prior art date
Application number
PCT/US2001/026542
Other languages
English (en)
Other versions
WO2002017545A3 (fr
Inventor
Gordon Lee
Kevin Huang
Weng-Iung Chen
Alan Lee
Original Assignee
Geyser Networks, Inc.
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 Geyser Networks, Inc. filed Critical Geyser Networks, Inc.
Priority to AU2001290570A priority Critical patent/AU2001290570A1/en
Publication of WO2002017545A2 publication Critical patent/WO2002017545A2/fr
Publication of WO2002017545A3 publication Critical patent/WO2002017545A3/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/60—Software-defined switches
    • H04L49/606—Hybrid ATM switches, e.g. ATM&STM, ATM&Frame Relay or ATM&IP
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/64—Hybrid switching systems
    • H04L12/6418—Hybrid transport
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H04Q11/0478—Provisions for broadband connections
    • 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
    • H04J2203/0003—Switching fabrics, e.g. transport network, control network
    • H04J2203/0005—Switching elements
    • 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
    • H04J2203/0003—Switching fabrics, e.g. transport network, control network
    • H04J2203/0005—Switching elements
    • H04J2203/0008—Time switch details
    • 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
    • H04J2203/0028—Local loop
    • H04J2203/0039—Topology
    • H04J2203/0041—Star, e.g. cross-connect, concentrator, subscriber group equipment, remote electronics
    • 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
    • H04J2203/0075—Connection-oriented
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/64—Hybrid switching systems
    • H04L12/6418—Hybrid transport
    • H04L2012/6424—Access arrangements

Definitions

  • the present invention relates to optical networking. More particularly, the invention relates to a system and method of nxSTS-1 bandwidth sharing and ring protection.
  • SONET Synchronous Optical Network
  • SDH See International Telecommunication Union. Network Node Interface for the Synchronous Digital Hierarchy. Recommendation G.707. March, 1996.
  • MPLS See Internet Engineering Task Force. Multiprotocol Label Switching Architecture. IETF Draft Document.
  • Nodes 110 and 112 are logically interconnected by fibers 120 and 122 to form ring 100, through which data traffic is being carried.
  • Node 112 includes a selector 130.
  • a source 140 is logically connected to node 110, while a destination 150 is logically connected to node 112. If fiber 120 is cut, then selector 130 selects data traffic from fiber 122. If fiber 122 is cut, then selector 130 selects data traffic from fiber 120.
  • the present invention provides a system and method of nxSTS-1 bandwidth sharing and ring protection.
  • the system and method of nxSTS-1 bandwidth sharing by every node on a nxSTS-1 ring includes (1) placing nxSTS-ls in the nxSTS-1 ring, (2) creating a nxNT point-to-point or point- to-multipoint connection within a nxSTS-1 pipe, and (3) globally managing NT resources in the ring via a ring manager.
  • the system and method of method of bandwidth doubling includes
  • the system and method of protecting a nxSTS-1 ring includes (1) in a normal mode, only having one ring manager as an active ring manager and (2) if the active ring manager fails, making another ring manager a new active ring manager according to a election protocol, where every node on the ring can be a candidate ring manager.
  • Figure 1 illustrates a prior art, standard SONET and SDH Unidirectional Path Switched Ring (UPSR) ring protection scheme.
  • UPSR Unidirectional Path Switched Ring
  • Figure 2A illustrates a normal DBA Channel in a nxSTS-1 ring being protected by the present invention in accordance with an exemplary embodiment of the present invention.
  • Figure 2B illustrates a DBA Channel in a nxSTS-1 ring with a fiber cut being protected by the present invention in accordance with an exemplary embodiment of the present invention.
  • Figure 2C illustrates a DBA Channel in a nxSTS-1 ring with a node failure being protected by the present invention in accordance with an exemplary embodiment of the present invention.
  • Figure 2D illustrates a normal DBA Channel in a nxSTS-1 ring with primary or secondary DBA Channel support being protected by the present invention in accordance with an exemplary embodiment of the present invention.
  • Figure 2E illustrates a DBA Channel in a nxSTS-1 ring 200 with primary or secondary DBA Channel support in BDM with a fiber cut being
  • Figure 3 illustrates a ring manager protection scheme in accordance with an exemplary embodiment of the present invention.
  • the invention described in co-pending and commonly assigned U.S. Patent Application No. (Number to be assigned) with Attorney Docket Number 55369-014 provides a system and method of virtually concatenating VT1.5s and STS-ls over SONET and SDH and WDM.
  • the virtual concatenation invention allows users to setup connections or pipes with configurable bandwidth over either nxSTS-l/nxAU-3/nxAU-4 or nxNT1.5/nxTU-l l/nxTU-12 within a nxSTS-l/nxAU-3/nxAU-4 pipe on an existing SO ⁇ ET/SDH network.
  • This provides a connection or pipe of adjustable bandwidth with a granularity of close to 1.5 Mbps to fit the needs of applications.
  • the resulting connection can be treated as a TDM like connection.
  • the virtual concatenation invention provides for virtual concatenation, which includes creating a logical connection or pipe by combining multiple, n (where n is a positive integer), STS-1 or VT connections or pipes, which may be contiguous or non-contiguous, into a single connection or pipe, nxSTS-1 or nxNT, respectively, in order to support a connection or pipe with a higher throughput than the throughput of the original STS-1 or NT pipes.
  • the present invention provides a system and method of nxSTS-1 bandwidth sharing and ring protection. UPSR Ring and DBA protection
  • the present invention provides for nxSTS-ls a modified UPSR ring architecture to realize both NT/STS path protection and DBA channel protection.
  • the present invention protects two types of virtual ring topologies:
  • nxSTS-1 Ring The present invention protects a nxSTS-1 ring in several ways. Referring to Figures 2A-2E, the protection ring (default is counter- clockwise) can be used to support unprotected secondary DBA channel (BDM, bandwidth doubling mode).
  • BDM bandwidth doubling mode
  • FIG. 2A illustrates a normal DBA Channel in a nxSTS-1 ring 200 being protected by the present invention.
  • the present invention protects nxSTS-1 ring 200 as follows:
  • one fiber 220 allows for SONET drop, add, and continue as a primary DBA channel; and (2) another fiber 222 allows for either SONET bypass or SONET drop, add, and continue, as a secondary DBA channel.
  • nxNT connections can be created within nxSTS-1 ring 200.
  • nxSTS-1 bandwidth can be shared by all nodes 210, 212, 214, and 216 on ring 200.
  • On ring 200 there are traffic paths 230, 232, 234, and 236.
  • traffic or data is either (a) continued in a SONET continue 231, (b) dropped in a SONET drop 233, or (c) added in a SONET add 235.
  • Fiber Cut Figure 2B illustrates a DBA Channel in a nxSTS- 1 ring 200 with a fiber cut being protected by the present invention.
  • the present invention protects nxSTS-1 ring 200 if there is a fiber cut 240 as follows:
  • the present invention forms a new ring with and loops traffic via traffic paths 230 and 236 in order to protect the primary DBA channel. Traffic paths 230 and 236 drop traffic from a healthy direction, add traffic to a healthy direction, and continue traffic in a healthy direction.
  • Node Failure Figure 2C illustrates a DBA Channel in a nxSTS-1 ring 200 with a node failure being protected by the present invention.
  • the present invention protects nxSTS-1 ring 200 if there is a node failure 209 in node 210 similarly to the way the present invention protects nxSTS-1 ring 200 if there is a fiber cut in Figure 2B.
  • the present invention detects "cuts" in the fiber 211 and 213 and forms a new ring with and loops traffic via traffic paths 232 and 236 in order to protect the primary DBA channel.
  • Traffic paths 232 and 236 drop traffic from a healthy direction, add traffic to a healthy direction, and continue traffic in a healthy direction.
  • Figure 2D illustrates a normal DBA Channel in a nxSTS-1 ring 200 with primary or secondary DBA Channel support being protected by the present invention.
  • ring 200 includes additional traffic paths 250, 252, 254, and 256, for the unprotected DBA channel. Traffic paths 230, 232, 234, and 236 still carry traffic for the protected DBA channel.
  • the present invention protects ring 200 in Figure 2D similarly to how the present invention protects ring 200 in Figure 2A.
  • FIG. 2E illustrates a DBA Channel in a nxSTS- 1 ring 200 with primary or secondary DBA Channel support in BDM with a fiber cut being protected by the present invention.
  • the present invention protects nxSTS-1 ring 200 if there is a fiber cut 240 similarly to the way the present invention protects nxSTS-1 ring 200 if there is a fiber cut in Figure 2B.
  • traffic paths 250, 252, 254, and 256 are eliminated, and the present invention forms a new ring with and loops traffic via traffic paths 230 and 232 in order to protect the primary DBA channel and discards the unprotected DBA channel.
  • Traffic paths 230 and 232 drop traffic f om a healthy direction, add traffic to a healthy direction, and continue traffic in a healthy direction.
  • the present invention provides ring manager protection as follows: (1) a newly elected primary ring manager (RM) takes a snapshot from ring 200:
  • the primary RM forces all other NTs forced to an UNUSED stated; and (2) the newly elected primary RM examine all valid connection identifications (CID) and see if there is any CID without root_vt: (a) for any CID without root_NT, the primary RM assigns an unused NT as the root_vt for the CID.
  • CID connection identifications
  • RM Election In an exemplary embodiment, the RM protection scheme is illustrated in Figure 3.
  • a primary RM detects a heartbeat of another primary RM, only the RM with smaller node ID will remain as the primary RM. Whenever this happens, a CPU interrupt is generated. Either EMS or hardware will reset ring 200. The following then occurs: (1) a secondary RM detects errors in a status message and starts RM election;
  • a priority is determined according to the Node ID.
  • a lower Node ID represents higher priority.
  • the path overhead (POH) of every STS-1 in the STS-nvc group will carry a RM status message.
  • the present invention reads it from any STS-1.
  • To send a status message the present invention writes each STS-1 POH F2 [7:0] is used to carry these messages.
  • a board controller fills RM_Stsmsg_STSnum register for the STS# to be used for reading status messages as an initialization process.
  • a RM_Node_ID register will be configured by the board controller.
  • the board controller configures how many non-valid status messages are to be received for the secondary RM to start primary RM re-election by transmitting status messages with an Active bit de-asserted (CLAIM ON).
  • CLAIM ON Active bit de-asserted
  • a RM_Stsmsg_period register is configured by the board controller for this function.
  • the status message is not dropped by any RMs when the claim procedure is not on.
  • a toggling status message could be sent.
  • One message is with its node id, and the next message is with FFF as its node ID. Any time the primary RM crashes or goes down, the status message will not be as expected. There will be either a parity error, a wrong primary node id, a not toggling status, or an Active bit goes disabled.
  • the secondary RMs see this and will start the CLAIM process. All RMs take part in the CLAIM process such that even if one node goes away, any other RM can be elected as the primary RM.
  • RMs will always receive status messages with a claim bit on.
  • Each RM will look at the receive node id and its own node id. If the receive node id is greater than its own node id, then this node transmits its own node id. If the receive node id is less than or equal to its own node id, then this node transmits the received node id.
  • the RM with the lowest node id receives the status message with its own node id and will wait for one more status message to confirm.
  • this RM will set itself as the primary RM and will start sending regular status messages with an Active bit asserted (CLAIM OFF).
  • CLAIM OFF Active bit asserted
  • RMs will receive the status messages with a claim bit off.
  • RMs except for the new elected Primary RM, will record the received id as the new primary ' RM id and will start monitoring status message as returning to normal operation. The primary RM will then start managing NTs.
  • the present invention also protects DBA commands. Since the DBA protocol is not memoryless, the present invention protects the multiple distributed states in the DBA protocol such that they are in sync. This is difficult to achieve especially when there is a fiber cut or when redundancy protection switching is happening.
  • the present invention provides several protection mechanism to ensure that the DBA protocol state machine does not go into a wrong state.
  • the present invention can detect errors in following two situations: (1) the present invention can detect errors in the NT POH with parity check error; and (2) the present invention can detect errors in the CID command when the CID command is not consistent with the local database.
  • VT POH Errors Whenever the NT POH has some error, the present invention performs the following:
  • the present invention ignores the incoming command and does not demap the data
  • the ring manager enforces the NT based on the original database, but collects back unused NTs.
  • VT POH CID Not Consistent Whenever the NT POH CID is not consistent with the local database, the present invention performs the following:
  • the present invention changes the CID to an UNUSED state.
  • mapper and RM perform the following whenever protection switching happens:
  • the present invention relates to optical networking. More particularly, the invention relates to a system and method of nxSTS-1 bandwidth sharing and ring protection. Having fully described a preferred embodiment of the invention and various alternatives, those skilled in the art will recognize, given the teachings herein, that numerous alternatives and equivalents exist which do not depart from the invention. It is therefore intended that the invention not be limited by the foregoing description, but only by the appended claims.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Small-Scale Networks (AREA)
  • Time-Division Multiplex Systems (AREA)

Abstract

L'invention concerne un système et un procédé de partage de la largeur de bande nxSTS-1 et de protection d'anneau. Le système et le procédé de partage de la largeur de bande nxSTS-1 par tous les noeuds d'un anneau nxSTS-1 consistent à: 1) placer des nxSTS-1 dans l'anneau nxSTS-1; 2) créer une connexion nxVT point à point ou point à mulipoint à l'intérieur du canal de communication nxSTS-1; et 3) gérer globalement les ressources VT dans l'anneau par l'intermédiaire d'un gestionnaire d'anneau. Le système et le procédé de protection de l'anneau nxSTS-1 consistent à: 1) dans un mode normal, utiliser uniquement un gestionnaire d'anneau en tant que gestionnaire d'anneau actif; et 2) en cas de défaillance du gestionnaire d'anneau actif, faire d'un autre gestionnaire d'anneau un nouveau gestionnaire d'anneau actif suivant un protocole d'élection, chaque noeud dans l'anneau pouvant être un gestionnaire d'anneau candidat.
PCT/US2001/026542 2000-08-23 2001-08-23 Systeme et procede de partage de la largeur de bande nxsts-1 et de protection d'anneau WO2002017545A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001290570A AU2001290570A1 (en) 2000-08-23 2001-08-23 System and method of nxsts-1 bandwidth sharing and ring protection

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US22800800P 2000-08-23 2000-08-23
US60/228,008 2000-08-23
US27279301P 2001-03-01 2001-03-01
US60/272,793 2001-03-01

Publications (2)

Publication Number Publication Date
WO2002017545A2 true WO2002017545A2 (fr) 2002-02-28
WO2002017545A3 WO2002017545A3 (fr) 2002-05-30

Family

ID=26921978

Family Applications (6)

Application Number Title Priority Date Filing Date
PCT/US2001/026567 WO2002017580A1 (fr) 2000-08-23 2001-08-23 Architecture de commutation double, destinee aux transports par paquets/circuits melanges sur reseau optique synchrone(sonet)/reseau hierarchique numerique synchrone(sdh)/reseau de multiplexage en longueur d'onde dense(dwdm)
PCT/US2001/026542 WO2002017545A2 (fr) 2000-08-23 2001-08-23 Systeme et procede de partage de la largeur de bande nxsts-1 et de protection d'anneau
PCT/US2001/026535 WO2002017544A2 (fr) 2000-08-23 2001-08-23 Protocole d'attribution de largeur de bande dynamique
PCT/US2001/026533 WO2002017542A2 (fr) 2000-08-23 2001-08-23 Systeme et procede pour l'affectation d'etiquettes mpls sur des connexions de transport sonet/hns a concatenation virtuelle
PCT/US2001/026557 WO2002017546A2 (fr) 2000-08-23 2001-08-23 Systeme et procede de concatenation virtuelle de vt1.5s et sts-1s sur un reseau optique synchrone (sonet), sur un reseau hierarchique numerique synchrone (sdh) et sur un reseau a multiplexage de longueur d'ondes (wdm)
PCT/US2001/026534 WO2002017543A2 (fr) 2000-08-23 2001-08-23 Systeme et procede pour le mappage de paquets de donnees de taille fixe et variable sur sonet et hns

Family Applications Before (1)

Application Number Title Priority Date Filing Date
PCT/US2001/026567 WO2002017580A1 (fr) 2000-08-23 2001-08-23 Architecture de commutation double, destinee aux transports par paquets/circuits melanges sur reseau optique synchrone(sonet)/reseau hierarchique numerique synchrone(sdh)/reseau de multiplexage en longueur d'onde dense(dwdm)

Family Applications After (4)

Application Number Title Priority Date Filing Date
PCT/US2001/026535 WO2002017544A2 (fr) 2000-08-23 2001-08-23 Protocole d'attribution de largeur de bande dynamique
PCT/US2001/026533 WO2002017542A2 (fr) 2000-08-23 2001-08-23 Systeme et procede pour l'affectation d'etiquettes mpls sur des connexions de transport sonet/hns a concatenation virtuelle
PCT/US2001/026557 WO2002017546A2 (fr) 2000-08-23 2001-08-23 Systeme et procede de concatenation virtuelle de vt1.5s et sts-1s sur un reseau optique synchrone (sonet), sur un reseau hierarchique numerique synchrone (sdh) et sur un reseau a multiplexage de longueur d'ondes (wdm)
PCT/US2001/026534 WO2002017543A2 (fr) 2000-08-23 2001-08-23 Systeme et procede pour le mappage de paquets de donnees de taille fixe et variable sur sonet et hns

Country Status (2)

Country Link
AU (6) AU2001290570A1 (fr)
WO (6) WO2002017580A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101401752B1 (ko) 2010-05-06 2014-05-30 엘에스산전 주식회사 링 네트워크에서의 링 매니저 선출 방법 및 노드

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1254054C (zh) * 2002-12-26 2006-04-26 华为技术有限公司 一种光网络中建立双向标签交换路径的方法
CN1310473C (zh) * 2003-01-07 2007-04-11 华为技术有限公司 基于同步数字传送网的数据传送方法
CN100440824C (zh) 2003-01-28 2008-12-03 华为技术有限公司 数字传送网上不同的数据帧接入和传送的方法
CN100484054C (zh) 2003-01-28 2009-04-29 华为技术有限公司 数字传送网上不同的数据帧接入和传送的系统和方法
ATE363796T1 (de) * 2003-12-19 2007-06-15 Alcatel Lucent Verfahren zur uebertragung eines zeitmultiplex rahmen über ein mpls netzwerk
EP1701495B1 (fr) 2005-03-09 2008-05-07 Nokia Siemens Networks Gmbh & Co. Kg Commutateur hybride numérique pour commuter le trafic de données par circuit et par paquets
CN101127628B (zh) 2006-08-14 2010-07-21 华为技术有限公司 一种管理和传送细粒度业务的方法和装置
JP2008306478A (ja) * 2007-06-07 2008-12-18 Nec Corp データ転送装置、データ転送方法及びデータ転送プログラム
GB2465589A (en) * 2008-11-24 2010-05-26 George Tsirakakis Integrated Multilayer Network Restoration using Hybrid Network Elements.
US9350563B2 (en) * 2014-02-12 2016-05-24 Coriant Operations, Inc. Procedure, apparatus, and computer program for reducing a probability of fragmentation when supporting virtual concatenation (VCAT) services
KR102239110B1 (ko) 2014-06-27 2021-04-13 삼성전자주식회사 통신 서비스 운용 방법 및 전자 장치

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5805568A (en) * 1995-09-25 1998-09-08 Fujitsu Limited Add/drop multiplexer for supporting fixed length cell
US6205562B1 (en) * 1996-09-20 2001-03-20 Hitachi, Ltd. Path switching method, path switching apparatus and nodes of UPSR

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4731785A (en) * 1986-06-20 1988-03-15 American Telephone And Telegraph Company Combined circuit switch and packet switching system
JPH05183530A (ja) * 1991-06-06 1993-07-23 Fujitsu Ltd 同期ペイロードポインタ処理方式
US5315594A (en) * 1992-03-02 1994-05-24 Alcatel Network Systems, Inc. Inter-network transport element of sonet overhead
US5784377A (en) * 1993-03-09 1998-07-21 Hubbell Incorporated Integrated digital loop carrier system with virtual tributary mapper circuit
US5579323A (en) * 1994-07-22 1996-11-26 Alcatel Network Systems, Inc. Virtual tributary/tributary unit transport method and apparatus
JP3419627B2 (ja) * 1996-06-11 2003-06-23 株式会社日立製作所 ルータ装置
US6148000A (en) * 1996-10-02 2000-11-14 International Business Machines Corporation Merging of data cells at network nodes
US6011802A (en) * 1996-10-22 2000-01-04 Sprint Communications Co. L.P. Method and system for conversion and transmission of communication signals
JP3425046B2 (ja) * 1996-11-29 2003-07-07 富士通株式会社 受信ポインタ処理装置
US6044088A (en) * 1997-09-30 2000-03-28 Alcatel Usa Sourcing, L.P. System and circuit for telecommunications data conversion

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5805568A (en) * 1995-09-25 1998-09-08 Fujitsu Limited Add/drop multiplexer for supporting fixed length cell
US6205562B1 (en) * 1996-09-20 2001-03-20 Hitachi, Ltd. Path switching method, path switching apparatus and nodes of UPSR

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101401752B1 (ko) 2010-05-06 2014-05-30 엘에스산전 주식회사 링 네트워크에서의 링 매니저 선출 방법 및 노드

Also Published As

Publication number Publication date
WO2002017546A2 (fr) 2002-02-28
AU2001288406A1 (en) 2002-03-04
WO2002017544A2 (fr) 2002-02-28
WO2002017544A3 (fr) 2002-05-16
WO2002017546A3 (fr) 2002-08-01
AU2001288397A1 (en) 2002-03-04
WO2002017542A3 (fr) 2002-05-16
AU2001286758A1 (en) 2002-03-04
AU2001288398A1 (en) 2002-03-04
WO2002017545A3 (fr) 2002-05-30
AU2001290570A1 (en) 2002-03-04
AU2001288396A1 (en) 2002-03-04
WO2002017580A1 (fr) 2002-02-28
WO2002017542A2 (fr) 2002-02-28
WO2002017543A2 (fr) 2002-02-28
WO2002017543A3 (fr) 2002-05-30

Similar Documents

Publication Publication Date Title
US10148349B2 (en) Joint IP/optical layer restoration after a router failure
US6256292B1 (en) Self-healing line switched ring for ATM traffic
CA2446239C (fr) Systeme de protection ethernet
US6952395B1 (en) Optical network restoration
US7450497B2 (en) Shared mesh signaling method and apparatus
US6940808B1 (en) Adaptive rate traffic recovery mechanism for communication networks
US7660238B2 (en) Mesh with protection channel access (MPCA)
US7370107B2 (en) Method for using the complete resource capacity of a synchronous digital hierarchy network, subject to a protection mechanism, in the presence of data (packet) network, and relating apparatus for the implementation of the method
US20040190461A1 (en) Virtual line switched ring (VLSR) connection state distribution scheme
US7616558B2 (en) Reduction of the transport capacity of a virtual concatenation group
US20020114031A1 (en) Ring configuration method, failure recovery method, and node address assignment method when configuring ring in network
US7606224B2 (en) Transmission apparatus for making ring switching at SONET/SDH and RPR levels
US20030041208A1 (en) Network element with redundant switching matrix
WO2002017545A2 (fr) Systeme et procede de partage de la largeur de bande nxsts-1 et de protection d'anneau
US6967948B2 (en) Out-of-band signalling apparatus and method for an optical cross connect
US20040221058A1 (en) Nested protection switching in a mesh connected communications network
US6683849B1 (en) Optical communications network
US6608836B2 (en) Method and apparatus for egress channel architecture that supports protection within SONET/sdh based networks
US20030235152A1 (en) Network system incorporating protection paths in the transmission bandwidth of a virtual concatenation signal
JP4649205B2 (ja) イーサーネットデュアルワーキングモードを設定する方法及びシステム
US7031261B1 (en) Method and apparatus for egress channel architecture that supports protection within SONET/SDH based networks
US6804268B1 (en) Method and apparatus for multi-access transmission
CA2493744C (fr) Procede et appareil de signalisation de mailles partagees

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A2

Designated state(s): AU BR CN DE DK ES GB IN JP KR MX PT SG

AL Designated countries for regional patents

Kind code of ref document: A2

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR

121 Ep: the epo has been informed by wipo that ep was designated in this application
AK Designated states

Kind code of ref document: A3

Designated state(s): AU BR CN DE DK ES GB IN JP KR MX PT SG

AL Designated countries for regional patents

Kind code of ref document: A3

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

32PN Ep: public notification in the ep bulletin as address of the adressee cannot be established

Free format text: NOTING OF LOSS OF RIGHTS PURSANT TO RULE 69(1) EPC

122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: JP