WO2003024029A3 - Metropolitan area local access service system - Google Patents

Metropolitan area local access service system Download PDF

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Publication number
WO2003024029A3
WO2003024029A3 PCT/US2002/028457 US0228457W WO03024029A3 WO 2003024029 A3 WO2003024029 A3 WO 2003024029A3 US 0228457 W US0228457 W US 0228457W WO 03024029 A3 WO03024029 A3 WO 03024029A3
Authority
WO
WIPO (PCT)
Prior art keywords
distribution network
local access
failure
recovery
service system
Prior art date
Application number
PCT/US2002/028457
Other languages
French (fr)
Other versions
WO2003024029A2 (en
Inventor
Michael Guess
Paul Niezgoda
Street Fraser
Original Assignee
Onfiber Communications 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 Onfiber Communications Inc filed Critical Onfiber Communications Inc
Priority to EP02768815A priority Critical patent/EP1425881A2/en
Priority to PCT/US2002/032469 priority patent/WO2004010653A1/en
Publication of WO2003024029A2 publication Critical patent/WO2003024029A2/en
Publication of WO2003024029A3 publication Critical patent/WO2003024029A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/35—Switches specially adapted for specific applications
    • H04L49/356—Switches specially adapted for specific applications for storage area networks
    • H04L49/357—Fibre channel switches
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/2852—Metropolitan area networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H04L12/4637—Interconnected ring systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/40—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/35—Switches specially adapted for specific applications
    • H04L49/351—Switches specially adapted for specific applications for local area network [LAN], e.g. Ethernet switches
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/35—Switches specially adapted for specific applications
    • H04L49/354—Switches specially adapted for specific applications for supporting virtual local area networks [VLAN]
    • 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
    • H04L49/602—Multilayer or multiprotocol switching, e.g. IP switching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0071—Provisions for the electrical-optical layer interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0073—Provisions for forwarding or routing, e.g. lookup tables
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0079—Operation or maintenance aspects
    • H04Q2011/0081—Fault tolerance; Redundancy; Recovery; Reconfigurability

Abstract

A local access fiber optical distribution network is disclosed in which a dedicated pair of diversely routed optical fibers is routed in the distribution network for each customer. In a preferred embodiment, a dual physical overlay ring core topology is used in the core. The distribution network includes working and protection logical path connectivity. No 802.1D Spanning Tree is required for recovery, providing resilience to any single network failure in any device or link, quick recovery times from failure, and a failure detection/recovery protocol that is not active on any devices other than the devices directly attached to the subscriber.
PCT/US2002/028457 2001-09-12 2002-09-06 Metropolitan area local access service system WO2003024029A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP02768815A EP1425881A2 (en) 2001-09-12 2002-09-06 Metropolitan area local access service system
PCT/US2002/032469 WO2004010653A1 (en) 2001-10-11 2002-10-10 Metropolitan area local access service system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/952,284 US20030048501A1 (en) 2001-09-12 2001-09-12 Metropolitan area local access service system
US09/952,284 2001-09-12

Publications (2)

Publication Number Publication Date
WO2003024029A2 WO2003024029A2 (en) 2003-03-20
WO2003024029A3 true WO2003024029A3 (en) 2003-07-31

Family

ID=25492743

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2002/028457 WO2003024029A2 (en) 2001-09-12 2002-09-06 Metropolitan area local access service system

Country Status (3)

Country Link
US (3) US20030048501A1 (en)
EP (1) EP1425881A2 (en)
WO (1) WO2003024029A2 (en)

Families Citing this family (57)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030048501A1 (en) * 2001-09-12 2003-03-13 Michael Guess Metropolitan area local access service system
US6717922B2 (en) * 2002-03-04 2004-04-06 Foundry Networks, Inc. Network configuration protocol and method for rapid traffic recovery and loop avoidance in ring topologies
US8451711B1 (en) * 2002-03-19 2013-05-28 Cisco Technology, Inc. Methods and apparatus for redirecting traffic in the presence of network address translation
US7209435B1 (en) * 2002-04-16 2007-04-24 Foundry Networks, Inc. System and method for providing network route redundancy across Layer 2 devices
US7489867B1 (en) * 2002-05-06 2009-02-10 Cisco Technology, Inc. VoIP service over an ethernet network carried by a DWDM optical supervisory channel
US7145865B1 (en) * 2002-06-26 2006-12-05 Bellsouth Intellectual Property Corp. Method for moving network elements with minimal network outages in an active ATM network
US7200331B2 (en) * 2002-07-15 2007-04-03 Lucent Technologies Inc. Wavelength routing on an optical metro network subtended off an agile core optical network
US7120336B2 (en) 2002-08-29 2006-10-10 Micron Technology, Inc. Resonator for thermo optic device
US7006746B2 (en) * 2002-08-29 2006-02-28 Micron Technology, Inc. Waveguide for thermo optic device
US7020365B2 (en) * 2002-08-29 2006-03-28 Micron Technology, Inc. Resistive heater for thermo optic device
US20050147027A1 (en) * 2002-08-30 2005-07-07 Nokia Corporation Method, system and hub for loop initialization
EP1546894A4 (en) * 2002-09-17 2011-05-18 Broadcom Corp System and method for access point (ap) aggregation and resiliency in a hybrid wired/wireless local area network
US8462668B2 (en) 2002-10-01 2013-06-11 Foundry Networks, Llc System and method for implementation of layer 2 redundancy protocols across multiple networks
US8051211B2 (en) * 2002-10-29 2011-11-01 Cisco Technology, Inc. Multi-bridge LAN aggregation
US20040160895A1 (en) * 2003-02-14 2004-08-19 At&T Corp. Failure notification method and system in an ethernet domain
US20040165595A1 (en) * 2003-02-25 2004-08-26 At&T Corp. Discovery and integrity testing method in an ethernet domain
US7292542B2 (en) * 2003-03-05 2007-11-06 At&T Bls Intellectual Property, Inc. Method for traffic engineering of connectionless virtual private network services
US7345991B1 (en) * 2003-05-28 2008-03-18 Atrica Israel Ltd. Connection protection mechanism for dual homed access, aggregation and customer edge devices
US7911937B1 (en) * 2003-05-30 2011-03-22 Sprint Communications Company L.P. Communication network architecture with diverse-distributed trunking and controlled protection schemes
US7463579B2 (en) * 2003-07-11 2008-12-09 Nortel Networks Limited Routed split multilink trunking
EP1501012B1 (en) * 2003-07-21 2008-02-27 Alcatel Lucent Software replacement method and related software replacement system
JP4438367B2 (en) * 2003-10-01 2010-03-24 日本電気株式会社 Network, relay transmission apparatus, and optical signal control method used therefor
DE10358344A1 (en) * 2003-12-12 2005-07-14 Siemens Ag Method for the replacement switching of spatially separated switching systems
KR100735239B1 (en) * 2004-05-28 2007-07-03 삼성전자주식회사 Optical fiber for metro network
US8218434B1 (en) * 2004-10-15 2012-07-10 Ciena Corporation Ethernet facility and equipment protection
JP4523382B2 (en) * 2004-11-02 2010-08-11 富士通株式会社 Multimode fiber transmission system
WO2006071131A1 (en) * 2004-12-27 2006-07-06 Fragoso Freitas Simoes Fernand Implementation method for a fixed optical communication network
CN100352223C (en) * 2004-12-31 2007-11-28 华为技术有限公司 Method for protecting data service in metropolitan area transmission network
DE102005004151A1 (en) * 2005-01-28 2006-08-10 Siemens Ag Method and device for assigning packet addresses of a plurality of devices
FR2882166B1 (en) * 2005-02-16 2007-04-27 Alcatel Sa DEVICE FOR CONVERTING ATM-BASED IP DATA TO ETHERNET IP DATA WITH HIGH AVAILABILITY FOR A COMMUNICATION NETWORK
US7688716B2 (en) * 2005-05-02 2010-03-30 Cisco Technology, Inc. Method, apparatus, and system for improving ethernet ring convergence time
US8264947B1 (en) * 2005-06-15 2012-09-11 Barclays Capital, Inc. Fault tolerant wireless access system and method
US7792017B2 (en) * 2005-06-24 2010-09-07 Infinera Corporation Virtual local area network configuration for multi-chassis network element
EP1763204B1 (en) * 2005-09-13 2013-12-04 Unify GmbH & Co. KG System and method for redundant switches taking into account learning bridge functionality
US7817541B2 (en) * 2005-09-16 2010-10-19 Acme Packet, Inc. Method and system of providing redundancy in a network device
EP1768307B1 (en) * 2005-09-23 2008-11-05 Nokia Siemens Networks Gmbh & Co. Kg Method for augmenting a network
KR100694231B1 (en) * 2006-01-16 2007-03-14 삼성전자주식회사 Apparatus and mehtod for processing packet
EP1865662A1 (en) * 2006-06-08 2007-12-12 Koninklijke KPN N.V. Connection method and system for delivery of services to customers
US20080042536A1 (en) 2006-08-21 2008-02-21 Afl Telecommunications Llc. Strain relief system
US20080144634A1 (en) * 2006-12-15 2008-06-19 Nokia Corporation Selective passive address resolution learning
DE102007015539B4 (en) * 2007-03-30 2012-01-05 Siemens Ag Method for reconfiguring a communication network
DE102007015449B4 (en) 2007-03-30 2009-09-17 Siemens Ag Method for reconfiguring a communication network
US7836360B2 (en) * 2007-04-09 2010-11-16 International Business Machines Corporation System and method for intrusion prevention high availability fail over
US8165031B2 (en) * 2007-10-12 2012-04-24 Rockstar Bidco, LP Multi-point and rooted multi-point protection switching
WO2009155996A1 (en) * 2008-06-27 2009-12-30 Telefonaktiebolaget L M Ericsson (Publ) Method and system for link aggregation
JP5088281B2 (en) * 2008-09-19 2012-12-05 沖電気工業株式会社 Packet synchronous switching method and gateway device
GB0906290D0 (en) * 2009-04-09 2009-05-20 Nomura Internat Plc Ultra low latency securities trading infrastructure
CN101645750B (en) * 2009-09-02 2013-09-11 中兴通讯股份有限公司 Distributed electrical cross device and system and method thereof for realizing SNC cascade protection
US8654630B2 (en) * 2010-03-19 2014-02-18 Brocade Communications Systems, Inc. Techniques for link redundancy in layer 2 networks
US8412042B2 (en) * 2010-04-21 2013-04-02 Cisco Technology, Inc. Innovative architecture for fully non blocking service aggregation without O-E-O conversion in a DWDM multiring interconnection node
CN101980488B (en) * 2010-10-22 2015-09-16 中兴通讯股份有限公司 The management method of ARP and three-tier switch
US8902734B2 (en) * 2011-01-31 2014-12-02 Telefonaktiebolaget L M Ericsson (Publ) System and method for providing communication connection resilience
US9491041B2 (en) * 2011-03-07 2016-11-08 Tejas Networks Limited Ethernet chain protection switching
US9264303B2 (en) 2011-03-11 2016-02-16 Tejas Networks Limited Protection switching method and system provision by a distributed protection group
DE102013110784B4 (en) * 2012-10-05 2021-03-18 Zte (Usa) Inc. SERVICE-SENSITIVE FLEXIBLE IPOWDM NETWORK AND OPERATING PROCEDURES
US9769058B2 (en) * 2013-05-17 2017-09-19 Ciena Corporation Resilient dual-homed data network hand-off
US10211944B2 (en) * 2015-05-26 2019-02-19 Nippon Telegraph And Telephone Corporation Station-side device and communication method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5107490A (en) * 1985-04-24 1992-04-21 Artel Communications Corporation Ring-type communication network
EP0538853A2 (en) * 1991-10-22 1993-04-28 Fujitsu Limited Distributed control of telecommunication network for setting up an alternative communication path
US5418785A (en) * 1992-06-04 1995-05-23 Gte Laboratories Incorporated Multiple-channel token ring network with single optical fiber utilizing subcarrier multiplexing with a dedicated control channel
EP0987857A1 (en) * 1998-09-16 2000-03-22 AT&T Corp. Back-up restoration technique for sonet-SDH rings
US6236640B1 (en) * 1997-02-03 2001-05-22 Siemens Aktiengesellschaft Method for alternate circuiting of transmission equipment in ring architectures for bidirectional transmission of ATM cells

Family Cites Families (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4871225A (en) * 1984-08-24 1989-10-03 Pacific Bell Fiber optic distribution network
US5530782A (en) * 1993-10-22 1996-06-25 Sumitomo Electric Industries, Ltd. Intermediate branching method for optical path
CN1150514A (en) * 1994-06-08 1997-05-21 英国电讯有限公司 Access network
US5608726A (en) * 1995-04-25 1997-03-04 Cabletron Systems, Inc. Network bridge with multicast forwarding table
FR2736777B1 (en) * 1995-07-12 1997-08-08 Alcatel Nv OPTICAL TRANSMISSION NETWORK WITH WAVELENGTH MULTIPLEXING
DE19526172C1 (en) * 1995-07-18 1997-01-30 Siemens Ag Method for transmitting ATM digital signals from a program unit, in particular digital data-compressed video distribution signals
US5835696A (en) * 1995-11-22 1998-11-10 Lucent Technologies Inc. Data router backup feature
US6108300A (en) * 1997-05-02 2000-08-22 Cisco Technology, Inc Method and apparatus for transparently providing a failover network device
US6859438B2 (en) * 1998-02-03 2005-02-22 Extreme Networks, Inc. Policy based quality of service
US7430164B2 (en) * 1998-05-04 2008-09-30 Hewlett-Packard Development Company, L.P. Path recovery on failure in load balancing switch protocols
CA2285101A1 (en) * 1998-10-08 2000-04-08 Wayne D. Grover Integrated ring-mesh network
US6330229B1 (en) * 1998-11-09 2001-12-11 3Com Corporation Spanning tree with rapid forwarding database updates
US7246168B1 (en) * 1998-11-19 2007-07-17 Cisco Technology, Inc. Technique for improving the interaction between data link switch backup peer devices and ethernet switches
US6088328A (en) * 1998-12-29 2000-07-11 Nortel Networks Corporation System and method for restoring failed communication services
US6856627B2 (en) * 1999-01-15 2005-02-15 Cisco Technology, Inc. Method for routing information over a network
US6351582B1 (en) * 1999-04-21 2002-02-26 Nortel Networks Limited Passive optical network arrangement
US6751191B1 (en) * 1999-06-29 2004-06-15 Cisco Technology, Inc. Load sharing and redundancy scheme
US6415323B1 (en) * 1999-09-03 2002-07-02 Fastforward Networks Proximity-based redirection system for robust and scalable service-node location in an internetwork
US6512614B1 (en) * 1999-10-12 2003-01-28 At&T Corp. WDM-based architecture for flexible switch placement in an access network
EP1132844A3 (en) * 2000-03-02 2002-06-05 Telseon IP Services Inc. E-commerce system facilitating service networks including broadband communication service networks
US7164698B1 (en) * 2000-03-24 2007-01-16 Juniper Networks, Inc. High-speed line interface for networking devices
AU2001238090A1 (en) * 2000-04-01 2001-10-15 Corning Incorporated Heating method and device
US6963575B1 (en) * 2000-06-07 2005-11-08 Yipes Enterprise Services, Inc. Enhanced data switching/routing for multi-regional IP over fiber network
US7009933B2 (en) * 2001-01-30 2006-03-07 Broadcom Corporation Traffic policing of packet transfer in a dual speed hub
US6565269B2 (en) * 2001-02-07 2003-05-20 Fitel Usa Corp. Systems and methods for low-loss splicing of optical fibers having a high concentration of fluorine to other types of optical fiber
US6519399B2 (en) * 2001-02-19 2003-02-11 Corning Cable Systems Llc Fiber optic cable with profiled group of optical fibers
US7058296B2 (en) * 2001-03-12 2006-06-06 Lucent Technologies Inc. Design method for WDM optical networks including alternate routes for fault recovery
US6470032B2 (en) * 2001-03-20 2002-10-22 Alloptic, Inc. System and method for synchronizing telecom-related clocks in ethernet-based passive optical access network
US6834056B2 (en) * 2001-06-26 2004-12-21 Occam Networks Virtual local area network protection switching
CA2392942C (en) * 2001-07-10 2010-03-16 Tropic Networks Inc. Protection system and method for resilient packet ring (rpr) interconnection
US7123836B2 (en) * 2001-07-16 2006-10-17 Avago Technologies Fiber Ip (Singapore) Pte. Ltd. All-optical network distribution system
US7289428B2 (en) * 2001-08-13 2007-10-30 Tellabs Operations, Inc. Inter-working mesh telecommunications networks
WO2003021858A1 (en) * 2001-09-04 2003-03-13 Rumi Sheryar Gonda Method for supporting sdh/sonet aps on ethernet
US20030048501A1 (en) * 2001-09-12 2003-03-13 Michael Guess Metropolitan area local access service system
US6766482B1 (en) * 2001-10-31 2004-07-20 Extreme Networks Ethernet automatic protection switching
US6826056B2 (en) * 2001-12-11 2004-11-30 Hewlett-Packard Development Company, L.P. Systems for use with data storage devices
US20030223379A1 (en) * 2002-05-28 2003-12-04 Xuguang Yang Method and system for inter-domain loop protection using a hierarchy of loop resolving protocols

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5107490A (en) * 1985-04-24 1992-04-21 Artel Communications Corporation Ring-type communication network
EP0538853A2 (en) * 1991-10-22 1993-04-28 Fujitsu Limited Distributed control of telecommunication network for setting up an alternative communication path
US5418785A (en) * 1992-06-04 1995-05-23 Gte Laboratories Incorporated Multiple-channel token ring network with single optical fiber utilizing subcarrier multiplexing with a dedicated control channel
US6236640B1 (en) * 1997-02-03 2001-05-22 Siemens Aktiengesellschaft Method for alternate circuiting of transmission equipment in ring architectures for bidirectional transmission of ATM cells
EP0987857A1 (en) * 1998-09-16 2000-03-22 AT&T Corp. Back-up restoration technique for sonet-SDH rings

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
YOSHIO KAJIYAMA ET AL: "AN ATM VP-BASED SELF-HEALING RING", IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, IEEE INC. NEW YORK, US, vol. 12, no. 1, 1994, pages 171 - 177, XP000493898, ISSN: 0733-8716 *

Also Published As

Publication number Publication date
US20030048746A1 (en) 2003-03-13
WO2003024029A2 (en) 2003-03-20
US20030048501A1 (en) 2003-03-13
US8031589B2 (en) 2011-10-04
US20050180339A1 (en) 2005-08-18
EP1425881A2 (en) 2004-06-09

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