WO2003107565A1 - Procede et moyen de protection virtuelle pour le chemin d'une fibre - Google Patents

Procede et moyen de protection virtuelle pour le chemin d'une fibre Download PDF

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Publication number
WO2003107565A1
WO2003107565A1 PCT/CN2002/000420 CN0200420W WO03107565A1 WO 2003107565 A1 WO2003107565 A1 WO 2003107565A1 CN 0200420 W CN0200420 W CN 0200420W WO 03107565 A1 WO03107565 A1 WO 03107565A1
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WO
WIPO (PCT)
Prior art keywords
protection
page
bus
site
switching
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.)
Ceased
Application number
PCT/CN2002/000420
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English (en)
Chinese (zh)
Inventor
Jixiong Dong
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.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
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
Priority to CN01102831.9A priority Critical patent/CN1184752C/zh
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to BR0211879-3A priority patent/BR0211879A/pt
Priority to AU2002304046A priority patent/AU2002304046A1/en
Priority to PCT/CN2002/000420 priority patent/WO2003107565A1/fr
Priority to US10/500,021 priority patent/US20050086232A1/en
Priority to KR1020047005826A priority patent/KR100602889B1/ko
Publication of WO2003107565A1 publication Critical patent/WO2003107565A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0287—Protection in WDM systems
    • H04J14/0293—Optical channel protection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0278—WDM optical network architectures
    • H04J14/0283—WDM ring architectures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0278—WDM optical network architectures
    • H04J14/0286—WDM hierarchical architectures

Definitions

  • the present invention relates to a virtual protection method and device for optical fiber paths, which are protected by many synchronous digital series (SDH) optical fiber networks, such as current protocol protection, channel protection, and the like! It provides an extended protection mode.
  • SDH synchronous digital series
  • the protection methods of SDH optical fiber transmission networks mainly include channel protection, multiplex section protection, and subnet connection protection.
  • multiplex section protection is the most widely used protection method on transmission networks. Including 1 + 1 linear multiplex section protection, 1: N linear multiplex section protection, 2/4 fiber uni / bidirectional multiplex section shared protection.
  • the basic principle of multiplex segment protection is to transmit switching information through the K1 / K2 bytes in the SDH frame, thereby implementing the protocol switching function.
  • K1 / K2 bytes are in the multiplex section in the SDH frame, in this way, one fiber or one optical port can only transmit a set of K1 / K2 bytes, that is, one fiber can only belong to one
  • the multiplex section system that is, a general multiplex section is a multiplex section based on an optical port.
  • This kind of protection has a disadvantage: it cannot flexibly implement corresponding protection according to different services, which results in a waste of VC4 resources on the optical interface. There are so many protection methods for SDH because different protection methods are needed in different applications.
  • the switching time is required to be less than 20ms, and the protection with the multiplex section may not meet the requirements. At this time, channel protection must be used to achieve this.
  • the multiplex section switching has its protocol word.
  • the inherent shortcoming of this section is that only 4 bits are used to represent the node number, then a ring can only support a maximum of 16 sites (excluding REG sites, (Ie relay station), when the number of nodes on the ring is greater than 16, other protection methods can only be used.
  • site A, site B, site C, and site D form a ring 101
  • site A, site B, site D, and site E form a ring 102.
  • the purpose of the present invention is to solve this kind of protection defect, and propose a virtual protection method and device for optical fiber paths, which not only protects more comprehensive and comprehensive, but also makes the transmission network more flexible, and the protection method more meets the needs of users.
  • a virtual protection method for a fiber path provided by the present invention includes the following steps: a. Physically dividing an optical port into one or more minimum protection units;
  • each station works in one of four working modes: normal working mode, punch-through working mode, bridge working mode, and switching working mode;
  • each site is switched from the normal working mode to the other three working modes through a switching action.
  • the switching action is multiplex segment protection, or subnet connection protection, or channel protection, or other protection methods capable of performing equivalent functions.
  • step d further includes: dl. Create a logical system for protection switching;
  • d2. Analyze the four sets of work, switch, bridge, and pass-through pages according to the current configuration; d3. After determining the pass-through site, bridge site, and switch site, issue the pass-through page at the pass-through site, issue the bridge page at the bridge site, and switch-over site Issue a switch page.
  • Step d3 further includes: if the current site issues a pass-through page, the in-protection bus is directly passed through to the egress protection bus; if the current site issues a bridge page, the in-protection bus is used to replace the working bus; if the current site delivers When the page is switched, the protection bus is replaced with the working bus.
  • the minimum protection unit is a fourth-order virtual container (VC4) or a third-order virtual container (VC3), and one or more of the more than one fourth-order virtual container or the third-order virtual container are mapped to different ones.
  • VC4 fourth-order virtual container
  • VC3 third-order virtual container
  • more than one logic system is formed.
  • the method further includes: the time division crossover unit in the transmission system uniformly cross-connects the services from different minimum protection units to the same minimum protection unit to the same minimum protection unit.
  • the present invention also provides a virtual protection device for a fiber path, which at least includes:
  • a page analyzer for analyzing the configuration of the logic system, generating a corresponding work page, and storing the work page in a switching controller
  • the switching controller is configured to issue a corresponding work page to the cross-connect board according to the switching status; the cross-connect board is used to complete a corresponding bus connection according to the work page issued.
  • the work page is a normal work page, or a through page, a bridge page, or a switch page.
  • the cross-board completes the bus connection by directly connecting the in-work bus and the out-work bus of the current station, or directly connecting the in-protection bus and the out-protection bus of the current station, or
  • the ingress protection bus of the station is connected to the egress protection bus, or the ingress protection bus of the current station is connected to the egress protection bus.
  • an optical port can have multiple minimum protection units, an optical port can be divided into multiple logical systems. It can flexibly choose different protection methods according to different services. In addition, different logical systems (different services, different networks) can use different switching conditions. In this way, the transmission network is more flexible and the protection method is more in line with user needs. Because the same system can be divided into multiple logical systems, each logical system can adopt different protection methods, breaking through the existing technology's one-of-a-kind model, so that more sites can be contained under the protection system. For the situations shown in FIG. 1, the site E that cannot be protected by the traditional method can also be protected here. It can be seen that the protection of the present invention is more thorough, comprehensive, and flexible. Brief description of the drawings
  • Figure 1 is a schematic diagram showing that two rings cannot be protected at the same time.
  • Figure 2 is a schematic diagram of different protection methods used by different services.
  • FIG. 3 is a schematic diagram of an embodiment of a bus crossing method according to the present invention.
  • FIG. 4 is a schematic diagram of an embodiment of unidirectional multiplex segment switching implementation in the present invention.
  • FIG. 5 is a schematic diagram of a multiplex segment switching algorithm according to the present invention.
  • Figure 6 is a schematic diagram of an existing network.
  • FIG. 7 is a schematic diagram of logical system division under virtual path protection
  • FIG. 8 is a schematic structural diagram of a virtual protection device for an optical fiber path according to the present invention. Mode of Carrying Out the Invention
  • the present invention can protect multiple services such as image services, voice services, signaling services, and cross-sea services. Different services can adopt different protection methods.
  • the core idea of its technical solution is this:
  • the concept of minimum protection unit This design idea is based on the fact that the optical port can be physically divided into 4th-order virtual containers (VC4), and the minimum protection unit is a VC4.
  • VC4 virtual containers
  • 622Mbit / s optical port can be regarded as four independent VC4s because its payload is 4 VC4s.
  • the SDH transmission system can be roughly divided into branch units, line units, and crossover units.
  • the division of the logical system of the present invention is the division of the line unit and the tributary unit.
  • the generation of the following switching pages is generated by this division. Different divisions have different switching pages, and the execution of the switching is mainly This is done by a cross unit.
  • there are many types of services such as 2M bit / s, 34M bit / s, 155M bit / s, etc., and the capacity on the line can be 155M bit / s, 622M bit / s, 2.5 G bit / s, etc., it is impossible to select different crossover units according to the line capacity or the different services.
  • time-division crossover units can be used on the cross. Services from different VC4 to the same VC4 are uniformly adjusted to the VC4 by the time-division crossover unit. .
  • VC4 can be used as the basic rate of the bus unit.
  • the meaning of this kind of bus crossing can be seen in Figure 3.
  • the left part of the arrow in Figure 3 indicates that there are three different VC4--VC4 # 1, VC4 # 2 and VC4 # 3, where the ones filled with oblique lines are the first The second unit of the VC4 (1,2), the third unit of the second VC4 (2,3), and the first unit of the third VC4 (3,1).
  • the SDH system multiplexes services from three VC4s onto the same VC4 for unified adjustment.
  • the multiplexed VC4 sequentially transmits services carried on (3,1), (1,2,) and (2,3). .
  • Logical system concept Since the same site can belong to multiple basic network topologies, and the protection method on each network may be different, the same base can be The physical medium under the same level and the same protection method of the topology is considered as a whole, which is called a logical system.
  • the attributes of the logic system are: level, such as 155M, 622M, 2500M, etc .; network element types, such as add / drop multiplexer (ADM), terminal network element (TM), relay station (REG); service direction, one-way or Bidirectional; protection type, channel protection, multiplex segment protection, 1 + 1, l: n protection, subnet connection protection, etc .; number of fibers, 2 or 4 fibers; basic network topology type, ring or chain, etc.
  • level such as 155M, 622M, 2500M, etc .
  • network element types such as add / drop multiplexer (ADM), terminal network element (TM), relay station (REG); service direction, one-way or Bidirectional
  • protection type channel protection
  • the logic system of ADM includes eastbound line, westbound line and optional branch, and the logic system of TM includes eastbound / westbound line and optional branch.
  • protection switching occurs in a logical system, if other logical systems do not meet the triggering conditions for protection switching of the logical system, only the services on the logical system participate in the protection switching process, that is, logic independence exists.
  • FIG. 4 is a schematic diagram of an embodiment of unidirectional multiplex segment switching implementation.
  • the left part of the arrow is a network topology in actual application, and the network includes a fiber ring and four sites AD on the ring.
  • Each ring represents the working channel and protection channel in the fiber
  • the right part of the arrow indicates the working status of the three types of sites-through-site, bridge site, and switching site.
  • the white box represents the working channel.
  • the diagonally striped box represents the protection channel.
  • the logic system 1 undergoes a multiplex segment switch, and it is not said that the logic system 1 undergoes a multiplex segment replacement; the switch is the switching from the working part to the protection part.
  • the virtual protection method of the optical fiber path of the present invention includes the following steps: a. Physically dividing the optical port into multiple minimum protection units;
  • the minimum protection units of multiple protection channels in each optical port are divided into different logical systems, so as to form more than one logical system; thus, the optical port is divided into multiple In different logic systems;
  • each site can work in one of four working modes: normal working mode, punch-through working mode, bridge working mode and switching working mode;
  • FIG. 5 is a schematic diagram of a simple process for implementing a multiplex segment switching algorithm.
  • a logic system for multiplex segment protection must be created, and then four sets of working pages are analyzed according to the configuration, that is, the normal working page, the switching page, the bridge page, and the pass-through page.
  • the normal work page is from the incoming work bus to the outgoing work bus
  • the pass-through page is from the incoming work bus to the outgoing work bus
  • the bridge page is from the outgoing work bus to the incoming work bus
  • the switching page is from the outgoing work bus to the incoming work bus.
  • the site is a bridging site, a protection site, or a pass-through site is analyzed by the protection switching controller.
  • a fiber optic ring network includes sites A to D.
  • the system needs to use the normal working pages of each site and At the location of the fault, analyze what changes should occur in the working status of sites A to D.
  • site B is a bridging site
  • site C is a switching site.
  • D issues a pass-through page
  • site B delivers a bridge page
  • site C delivers a switch page.
  • bus switching is used here, which is different from the traditional switching method (all the VC4 on the optical port is involved in the switching), and the VC4 to which the logical system belongs is involved in the switching. Therefore, you can configure the number of VC4s participating in switching according to your own needs, and use other VC4s for other protections.
  • FIG. 6 is a topology diagram of a certain network in the prior art. In the counterclockwise direction, the network elements A, B, and 0
  • C, D, E, F, and G form ring 601; network elements H, I, J, K, L, M, N, and O form ring 602, and the two rings are connected through GH and FI.
  • the multiplex segment protection method or other protection methods may be adopted to protect the services in the ring, but the services between the rings cannot be protected.
  • FIG. 7 is a method for logically dividing the network by using the present invention.
  • the ring shown by the dotted line in FIG. 7 is two optical fiber ring networks composed of each network element in practical applications.
  • a virtual ring 701 is composed of network elements A, B, C, D, E, F, and G, and is composed of network elements H, I, J, K, L, and M.
  • N, and O form a virtual ring 702
  • the network elements A, B, C, D, E, F, I, J, K, L, M, N, O, H, G form a large virtual ring 703.
  • multiplex segment protection can be used to protect intra-ring services
  • the virtual ring 703 can use channel protection to protect inter-ring services.
  • two logical systems are configured at each site. According to the needs of the business, all VC4s of each fiber can be mapped into the multiplex segment logical system, and some of the VC4s can be mapped to the complex logical system.
  • FIG. 8 shows a structure of a virtual protection device for realizing the above-mentioned virtual protection method according to the present invention.
  • the virtual protection device of the optical fiber path includes at least a page analyzer 801, a switching controller 802, and a crossbar 803.
  • the corresponding work page is issued in the switched state, and the corresponding bus connection is completed.
  • the page analyzer 801 is used to analyze the configuration of the logic system, generate corresponding four sets of work pages for normal work, punch-through, bridge, and switch, and store the work pages in the switch controller 802. Because each site has a lot of logic System, so there are many sets of pages, so the pages are all related to the logical system.
  • the switching controller 802 is configured to issue a corresponding work page to the cross-connect board 803 according to the switching state, and complete the corresponding bus connection through the cross-connect board 803 to complete the switching action.

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  • Small-Scale Networks (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Optical Communication System (AREA)

Abstract

Cette invention concerne un procédé de protection virtuelle pour le chemin d'une fibre. Ce procédé consiste : à diviser le port optique en plusieurs unités de protection minimum au sens physique, puis à diviser le système en au moins deux systèmes logiques sur la base des unités de protection minimum. Dans chaque système logique, chaque station peut fonctionner dans chacun des modes suivants : mode de fonctionnement normal, mode de fonctionnement passant, mode de fonctionnement pont et mode de fonctionnement de commutation. Lorsque la station a besoin d'une protection, elle peut passer du mode de fonctionnement normal aux autres modes de fonctionnement grâce aux fonctions de protection des segments multiplexés, de la connexion de sous-réseaux et du canal. Cette invention concerne également un moyen de protection virtuelle pour le chemin de la fibre. Grâce à ce procédé et à ce moyen, non seulement cette invention permet de résoudre les problèmes des fonctions de protection actuelles, mais elle rend également la mise en réseau de transmissions plus flexible et les fonctions de protection plus adaptées aux demandes des utilisateurs.
PCT/CN2002/000420 2001-02-05 2002-06-14 Procede et moyen de protection virtuelle pour le chemin d'une fibre Ceased WO2003107565A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
CN01102831.9A CN1184752C (zh) 2001-02-05 2001-02-05 光纤路径的虚拟保护方法及装置
BR0211879-3A BR0211879A (pt) 2002-06-14 2002-06-14 Método e dispositivo para proteção virtual para percurso de fibra
AU2002304046A AU2002304046A1 (en) 2002-06-14 2002-06-14 A virtual protection method and means for the fiber path
PCT/CN2002/000420 WO2003107565A1 (fr) 2001-02-05 2002-06-14 Procede et moyen de protection virtuelle pour le chemin d'une fibre
US10/500,021 US20050086232A1 (en) 2001-02-05 2002-06-14 Virtual protection method and device for fiber path
KR1020047005826A KR100602889B1 (ko) 2002-06-14 2002-06-14 광섬유 경로의 가상 보호 방법 및 장치

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN01102831.9A CN1184752C (zh) 2001-02-05 2001-02-05 光纤路径的虚拟保护方法及装置
PCT/CN2002/000420 WO2003107565A1 (fr) 2001-02-05 2002-06-14 Procede et moyen de protection virtuelle pour le chemin d'une fibre

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WO2003107565A1 true WO2003107565A1 (fr) 2003-12-24

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PCT/CN2002/000420 Ceased WO2003107565A1 (fr) 2001-02-05 2002-06-14 Procede et moyen de protection virtuelle pour le chemin d'une fibre

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WO (1) WO2003107565A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1315278C (zh) * 2002-11-25 2007-05-09 华为技术有限公司 一种用于光波分网络的虚拟环保护方法
CN1300954C (zh) * 2003-08-15 2007-02-14 华为技术有限公司 双向线路保护倒换方法
CN1802030B (zh) * 2005-01-07 2010-04-28 华为技术有限公司 业务路径调整优化方法
CN101001116B (zh) * 2007-01-16 2012-06-13 烽火通信科技股份有限公司 一种实现虚拟复用段环保护的方法
CN102025585A (zh) * 2009-09-09 2011-04-20 中兴通讯股份有限公司 以太网隧道的保护方法与装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5933258A (en) * 1995-09-06 1999-08-03 Northern Telecom Optical communication system
EP1059772A2 (fr) * 1999-06-09 2000-12-13 Alcatel Procédé de récupération de chemins de diffusion unidirectionelle défaillante dans des anneaux de télécommunication tranocéaniques MS-SP
WO2001048938A1 (fr) * 1999-12-28 2001-07-05 Telefonaktiebolaget Lm Ericsson (Publ) Protection dans des systemes mrl mixtes optiques
US6331905B1 (en) * 1999-04-01 2001-12-18 The Trustees Of Columbia University In The City Of New York Network switch failure restoration

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5933258A (en) * 1995-09-06 1999-08-03 Northern Telecom Optical communication system
US6331905B1 (en) * 1999-04-01 2001-12-18 The Trustees Of Columbia University In The City Of New York Network switch failure restoration
EP1059772A2 (fr) * 1999-06-09 2000-12-13 Alcatel Procédé de récupération de chemins de diffusion unidirectionelle défaillante dans des anneaux de télécommunication tranocéaniques MS-SP
WO2001048938A1 (fr) * 1999-12-28 2001-07-05 Telefonaktiebolaget Lm Ericsson (Publ) Protection dans des systemes mrl mixtes optiques

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Publication number Publication date
CN1184752C (zh) 2005-01-12
CN1368803A (zh) 2002-09-11

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