CN1108046C - Method for inhibiting continuous errors in ring-shaped optical SDH network - Google Patents
Method for inhibiting continuous errors in ring-shaped optical SDH network Download PDFInfo
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- CN1108046C CN1108046C CN 99123039 CN99123039A CN1108046C CN 1108046 C CN1108046 C CN 1108046C CN 99123039 CN99123039 CN 99123039 CN 99123039 A CN99123039 A CN 99123039A CN 1108046 C CN1108046 C CN 1108046C
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Abstract
The present invention relates to a method for inhibiting an error caused by error linking in a ring-shaped SDH optical transmission network, which comprises the following steps: configuring a service time slot by a network management layer when networking; assigning a unique effective channel tracking mark according to the configuration of the service time slot; transferring the channel tracking mark to a processing unit of a photoelectric branch circuit; starting the 'pressing-in AU-AIS' function of the processing unit of a photoelectric branch circuit; receiving services by the processing unit of a photoelectric branch circuit and judging whether channel tracking mark bytes are matched or not; if discovering the mismatch warning of the channel tracking mark, automatically pressing AU-AIS towards the corresponding branch circuit to inhibit the error. The method for inhibiting an error caused by error linking has the advantages of simple logic judgment and no need of complicated calculation, and the method can adapt to a plurality of protection types and accurately solve the condition of lower-order VC access.
Description
The present invention relates to annular SDH (Synchronous Digital Hierarchy SDH (Synchronous Digital Hierarchy)) optical transport network, specifically a kind of resistance mistake method that mistake connects when ring-shaped optical SDH network carries out APS.
At present; ring-shaped optical SDH network is used widely in the telecommunication transmission net; an important feature of SDH optical transport network has self-healing property exactly; promptly have APS function (AutomaticProtection Switching is called for short APS), the ITU-T of International Telecommunication Association (branch of the relevant telecommunication standard of International TelecommunicationUnion Telecommunication Standardization Sector International Telecommunications Union) G.841 number suggestion " type and the characteristic of SDH network protection architecture " has been made concrete suggestion to the APS function of SDH network.But, according to ITU-T suggestion G.841, when annular SDH network carries out APS, wrong (misconnection) phenomenon that connects can may appear inevitably.Be in the SDH transmission network of two-fibre two-way multi-section shared protection for example forming protection mechanism; if exist multiple spot to lose efficacy on the ring; such as the inefficacy that produces isolated node; may compete to the time slot on the same protection channel from the business that the difference section of striding is come on the identical time slot, this will cause professional incorrect link.As shown in Figure 1 and Figure 2, Fig. 1 is the SDH loop network under the normal condition; Fig. 2 is the SDH loop network behind the generation APS when node A lost efficacy, and internodal dark colour partly is a working channel, and white portion is the protection channel, and the direction of arrow is represented the direction of transmission route.By among Fig. 2 as can be seen, wrong company has taken place in node F and node C.Even under the single point failure situation, if extra traffic is arranged, the business on the working channel just may protect the extra traffic of identical time slot on the channel to clash with inserting on the ring, and this also will cause wrong the company.
Connect the generation of situation at mistake; G.841, the solution that proposes during ITU-T advises is: potential mistake connect can be by identification since the bridge joint request will become those nodes of switching node and inspection switch in affected business determine; switching node can be determined from the node address K1 and the K2 byte; switching node can be determined protected business of switching influence from ring figure information with from the identification of switching node, and potential mistake company can hinder mistake (squelching) by way from suitable AU-AIS (Administrative Unit-AlarmIndication Signal Administration unit alarm indication signal) to the time slot that may produce wrong company that insert.Each ring figure information should comprise at least: the order information that appears at the node on the ring; To situation at service provisioning AU4 (Administrative Unit level 4 speed grade are 4 the administrative unit) time slot of this node termination and this node of break-through; For each AU4 time slot, business goes out ring and advances the node address of ring; Whether somewhere AU4 is linked into the optional indication of low order VC (Virtual Container virtual container) on ring.In actual applications, there is following point in the solution of ITU-TG.841 suggestion proposition: 1, decision logic complexity; 2, data volume is big, and calculation of complex directly influences the speed and the time of APS process; 3, the more important thing is, the method of suggestion is to only limit to AU3/4 (Administrative Unit level 3 speed grade are 3 administrative unit) level, it can't solve the wrong problem of the wrong resistance that connects under the low order VC access situation, especially the situation that the low order VC of homology/destination address not is linked into same AU3/4 kind can't correctly be handled especially, and this is situation about often occurring in actual applications.
It is simple to the objective of the invention is to propose a kind of decision logic, need not complicated calculations, and can correctly solve the wrong resistance mistake method that connects of low order VC access situation.
The wrong resistance mistake method that connects in a kind of ring-shaped optical SDH network, ring-shaped optical SDH network on a kind of ordinary meaning is to be made of the add-drop multiplexer of some quantity (ADM) website, each ADM website comprises basic building blocks such as time slot cross processing unit and photoelectricity branch road processing unit, it is characterized in that may further comprise the steps:
(1) when networking, carries out the business time-slot configuration, promptly specify the interconnection relation by the webmaster layer;
(2) channels track according to J1/J2 byte in the unique effective path overhead byte of business time-slot configuration assignment identifies;
(3) the channels track sign with the J1/J2 byte of distributing is issued to corresponding photoelectricity branch road processing unit;
(4) start " being pressed into Administration unit alarm indication signal " function on each photoelectricity branch road processing unit;
(5) photoelectricity branch road processing unit receives business, and carries out the J1/J2 bytes match judgement of each branch service;
(6) if find the alarm of J1/J2 mismatch, photoelectricity branch road processing unit is pressed into " Administration unit alarm indication signal " from the corresponding branch road of trend, finishes the wrong operation of resistance.
Business time-slot configuration described in the step (1) comprises: determine that the import/export business of each node and various rate business distribute, the use of determining AU4 in the middle of N available transmission AU4 of appointment light direction distributes planning, determine that low order VC3/VC12 (Virtual Container level 12 speed grade are that 1,2 virtual container Virtual Container level 3 speed grade are 3 virtual container) in the lift-launch situation of AU4, is sent to assignment information on the corresponding time slot cross processing unit.
It is to be issued in the time slot processing module of photoelectricity branch road processing unit that the channels track of the middle J1/J2 byte of step (3) identifies.
The present invention is described in further detail below in conjunction with accompanying drawing.
Fig. 1 is the SDH loop network schematic diagram under the normal condition;
Fig. 2 is the SDH loop network schematic diagram behind the generation APS;
Fig. 3 is the flow chart of the wrong resistance mistake method that connects in the ring-shaped optical SDH network.
Fig. 1 and Fig. 2 had done explanation when introducing the wrong generation that connects situation in front, Fig. 3 is at such as the flow chart that occurs the wrong resistance mistake method that connects phenomenon and take among Fig. 2.The wrong resistance mistake method that connects proposed by the invention is actually mistake connected to be judged and hinders wrong work and transfer on the photoelectricity branch road level and carry out; because no matter how to switch on the optical link; it is professional that up and down bypass passage is changeless in this locality; according to SDH frame structure characteristics; no matter high-order VC still is that low order VC has corresponding channels track identification byte; when respective channel breaks down; can produce channels track sign mismatch alarm (Trace Identifier Mismatch is called for short TIM); it also is like this connecting situation for mistake; these functions and structure all are that the SDH optical transmission device of standard is intrinsic, can't be different owing to the difference of the protection type that is adopted.At first, when networking, carry out the business time-slot configuration by the webmaster layer, comprise: determine that the import/export business of each node and various rate business distribute, the use of determining AU4 in the middle of N available transmission AU4 of appointment light direction distributes planning, determine the lift-launch situation of low order VC3/VC12 at AU4, the communication module that assignment information is sent to corresponding time slot intersection control unit is first-class; Then, according to the unique effective channels track sign of business time-slot configuration assignment.In STM-N (Synchronous Transport Module level N speed grade is the synchronous transfer mode of N) path overhead POH (Path Overhead) byte, there are two bytes to be used for the channels track sign, byte J1 is used for the channels track sign of VC3/VC4, and byte J2 is used for the channels track sign of VC12.In the business time-slot configuration of carrying out each network node, for the business (no matter being high-order VC or low order VC) that each configuration is inserted is all specified unique effective channels track identification byte, and preset the channels track identification byte that will receive at the photoelectricity branch road processing unit place that this business is told, the channels track sign of the J1/J2 byte that is about to distribute is issued to corresponding photoelectricity branch road processing unit, constitutes the signaling of shaking hands; Then, start " being pressed into AU-AIS (the Administration unit alarm indication signal) " function of dividing the out branch control circuit in each photoelectricity branch road processing unit on each network node.When the photoelectricity processing unit receives corresponding VC3/VC4/VC12 when professional, channels track identification byte that receives and the channels track identification byte that presets to be compared simultaneously, if wrong the company takes place, the inconsistent situation of channels track identification byte will occur, also will produce channels track sign mismatch alarm (TIM).Therefore, wrong when connecting situation when occurring, photoelectricity branch road processing unit can identify mismatch alarm (TIM) according to channels track and judge professional wrong company of corresponding VC, and directly is pressed into AU-AIS (Administration unit alarm indication signal) to corresponding branch road and hinders wrong operation.
Because the present invention proposes the judgement that the wrong resistance mistake method that connects only need be carried out channels track sign mismatch alarm (TIM), so decision logic is very simple; The channels track identification information that each network node need be assigned is only relevant with the business time-slot of telling insertion at this node, corresponding data volume is very little, and as long as when the business time-slot configuration is carried out in networking, after carrying out the computing of channels track sign assignment, when just noting be used in loop network and occurring switching each time, carried out concrete repetitive operation; After judging channels track sign mismatch alarm (TIM), photoelectricity branch road processing unit will directly hinder wrong operation, is pressed into AU-AIS (Administration unit alarm indication signal), so also need not complicated calculations; In addition, judge and hinder wrong work and transfer to and carry out on the photoelectricity branch road level because the present invention is actually mistake connected, shared the work of APS (APS) controller by photoelectricity branch road processing unit, therefore it has guaranteed the speed and the time of APS to the not influence of process of APS; The present invention can also accomplish to shoot the arrow at the target, and only hinders wrong operation at the passage that breaks down, and regardless of protecting type, can be suitable for all situations.The most important thing is, the resistance mistake method of using the present invention to propose, can correctly solve the wrong problem of resistance under the low order VC access situation effectively, be particularly useful for different rates rank VC and mix situation about using, can not operate, and the insertion business of telling of the normal node in the middle of same AU4 is pressed into AU-AIS (Administration unit alarm indication signal) and causes professional interruption because of the resistance of a failure node is wrong.
In sum, the wrong resistance mistake method that connects is that a kind of decision logic is simple in the ring-shaped optical SDH network that the present invention proposes, and need not complicated calculations, can adapt to the kinds of protect type and can correctly solve low order VC to insert the wrong resistance mistake method that connects of situation.
Claims (3)
1, the wrong resistance mistake method that connects in a kind of ring-shaped optical SDH network, described ring-shaped optical SDH network comprises some quantity add-drop multiplexer websites, each add-drop multiplexer website comprises time slot cross processing unit and photoelectricity branch road processing unit, it is characterized in that may further comprise the steps:
(1) when networking, carries out the business time-slot configuration by the webmaster layer;
(2) channels track according to J1/J2 byte in the unique effective path overhead byte of business time-slot configuration assignment identifies;
(3) the channels track sign with the J1/J2 byte of distributing is issued to corresponding photoelectricity branch road processing unit;
(4) start " being pressed into Administration unit alarm indication signal " function on each photoelectricity branch road processing unit;
(5) photoelectricity branch road processing unit receives business, and carries out the J1/J2 bytes match judgement of each branch service;
(6) if find the alarm of J1/J2 mismatch, photoelectricity branch road processing unit is pressed into " Administration unit alarm indication signal " from the corresponding branch road of trend, finishes the wrong operation of resistance.
2. the wrong resistance mistake method that connects in a kind of ring-shaped optical SDH network as claimed in claim 1, it is characterized in that: the business time-slot configuration described in the step (1) comprises: determine that the import/export business of each node and various rate business distribute, the use of determining AU4 in the middle of N available transmission AU4 of appointment light direction distributes planning, determine the lift-launch situation of low order VC3/VC12, assignment information is sent on the corresponding time slot intersection controlled processing unit at AU4.
3. the wrong resistance mistake method that connects in a kind of ring-shaped optical SDH network as claimed in claim 1 or 2 is characterized in that: the channels track of J1/J2 byte sign is to be issued to photoelectricity branch road processing unit in the step (3).
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| Application Number | Priority Date | Filing Date | Title |
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| CN 99123039 CN1108046C (en) | 1999-10-27 | 1999-10-27 | Method for inhibiting continuous errors in ring-shaped optical SDH network |
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| CN 99123039 CN1108046C (en) | 1999-10-27 | 1999-10-27 | Method for inhibiting continuous errors in ring-shaped optical SDH network |
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| CN1273474A CN1273474A (en) | 2000-11-15 |
| CN1108046C true CN1108046C (en) | 2003-05-07 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1332532C (en) * | 2003-10-31 | 2007-08-15 | 华为技术有限公司 | Method for realizing shared guard ring misconnecting susppression for multiplexing section and system thereof |
| CN100426734C (en) * | 2003-10-31 | 2008-10-15 | 华为技术有限公司 | Method for monitoring and managing synchronous digital system / synchronous optic fiber network |
| CN1287558C (en) * | 2003-12-29 | 2006-11-29 | 中兴通讯股份有限公司 | Recovering method for optical transmission circular network wrong connection business |
| CN100377506C (en) * | 2004-08-18 | 2008-03-26 | 华为技术有限公司 | Method for preventing error connection |
| CN101102163B (en) * | 2006-07-04 | 2012-03-07 | 华为技术有限公司 | Method for preventing the protection network of the loop multiplexing section from incorrect optical fiber connection and loop multiplexing section network |
| CN101111033B (en) * | 2007-08-31 | 2013-10-02 | 华为技术有限公司 | Crosstalk detecting method, network side equipment and terminal |
| CN101453289B (en) * | 2007-11-29 | 2011-12-07 | 中兴通讯股份有限公司 | Channel overhead processing equipment for optical synchronous digital transmission system |
| CN101321029B (en) * | 2008-06-24 | 2012-06-13 | 中兴通讯股份有限公司 | Method for inserting alarm to unallocated time slot |
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Granted publication date: 20030507 |