CN100440770C - Method for backward transmitting virtual cascade group far end flaw indication - Google Patents

Method for backward transmitting virtual cascade group far end flaw indication Download PDF

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Publication number
CN100440770C
CN100440770C CNB2005100855068A CN200510085506A CN100440770C CN 100440770 C CN100440770 C CN 100440770C CN B2005100855068 A CNB2005100855068 A CN B2005100855068A CN 200510085506 A CN200510085506 A CN 200510085506A CN 100440770 C CN100440770 C CN 100440770C
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Prior art keywords
cascade group
virtual cascade
virtual
defect
indication information
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Expired - Fee Related
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CNB2005100855068A
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Chinese (zh)
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CN1901435A (en
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刘爱华
王琳琳
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ZTE Corp
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ZTE Corp
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Abstract

This invention discloses a method for back-transmitting far end defect instruction of a virtual cascade set including: selecting several key fields in the virtual cascade multiframe spending to be used in sending back the defect instruction information of the host end of the virtual cascade set, which sets the defect instruction information of the local at a related field place of the selected multiframe spending based on the tested local defect state and utilizes the multiframe spending to send back the defect information to the source end of the virtual cascade set.

Description

A kind of method that returns the indication of virtual cascade group far end defective
Technical field
The present invention relates to the communications field, especially relate to a kind of method that returns the indication of virtual cascade group far end defective that is used for the SDH optical transmission device based on SDH (Synchronous Digital Hierarchy, SDH (Synchronous Digital Hierarchy)) technology.
Background technology
In recent years, obtained extensive use based on multi-service transport platform (MSTP:Multi-Service TransportPlatform) technology of SDH in metropolitan area network, the core concept of this technology is exactly to adopt the mode of VC Virtual Concatenation to come transmitting data service.VC refers to virtual container, is a technical term among the SDH, and VC4 and VC12 represent varigrained virtual container, and VC4 is the virtual container of a 140M, and VC12 is the virtual container of a 2M.Because different data services is different to bandwidth requirement, and concerning SDH, its each virtual container loaded service bandwidth is conditional.But the bandwidth requirement of actual data traffic may be greater than the capacity of a virtual container, and the container of this synthetic bigger bandwidth that just virtual container need be cascaded up is with bearing data service.Two kinds of cascade systems are arranged, i.e. Adjacent Concatenation and Virtual Concatenation on principle.Because Virtual Concatenation can carry out multi-path transmission, therefore in the load bearing process of data service, what generally adopt is Virtual Concatenation.By the configuration of Virtual Concatenation, can satisfy the requirement of various data services flexibly to the virtual container quantity of cascade.
But because the Member Link of virtual cascade group can be walked different paths, the differential delay between the different members may surpass the limit that virtual cascade group place end can compensate, and loses efficacy thereby cause Virtual Concatenation Su Duan to separate payload; Even perhaps walk identical path, also may cause Virtual Concatenation Su Duan to separate payload because Member Link has alarm or error code and lose efficacy.In this case, the source end of virtual cascade group is not often known the state of Su Duan, and this will cause inconvenience to the operation maintenance of transmission equipment.
Summary of the invention
The technical issues that need to address of the present invention provide a kind of method that returns virtual cascade group far end defective indication, adopt the present invention, make the source end of virtual cascade group can in time know the defect state of Su Duan, make things convenient for the operation maintenance of equipment.
In order to solve the problems of the technologies described above, the invention provides a kind of method that returns the indication of virtual cascade group far end defective, comprise the steps:
(a) select some fields of reserved field in the Virtual Concatenation multi-frame expense to be used for the defect indication information of loopback virtual cascade group Su Duan;
(b) virtual cascade group Su Duan is according to detected local terminal defect state, and the respective field place of selected multi-frame expense is provided with the defect indication information of local terminal in step (a), and utilizes the multi-frame expense to the described defect indication information of virtual cascade group source end loopback.
Further, the present invention has following characteristics, and this method also comprises the steps:
Virtual cascade group source end extracts described defect indication information from the multi-frame expense of place end loopback, and takes measures areput.
Further, the present invention has following characteristics, and step (b) further can be divided into following steps:
(b1) end receiver side in virtual cascade group place detects the defect state of local terminal, and generates defect indication information according to this defect state;
(b2) end receiver side in virtual cascade group place is arranged at defect indication information at the respective field place of multi-frame expense selected in the step (a);
(b3) virtual cascade group place end transmitter side utilizes the defect indication information of multi-frame expense loopback local terminal.
Further, the present invention has following characteristics: the defect state of described local terminal comprises that the compensation of virtual cascade group differential delay is failed, all members' multiframe indicator sequence identifiers asynchronous and all members are made mistakes.
Further, the present invention has following characteristics: the defect state of described local terminal comprises that the compensation of virtual cascade group differential delay is failed, any one member's multiframe indicator sequence identifier asynchronous and any one member is made mistakes.
Further, the present invention has following characteristics: virtual cascade group place end utilizes the mode of the defect indication information of multi-frame expense loopback local terminal to comprise single-bit passback mode and multi-frame sequence passback mode.
Further, the present invention has following characteristics: virtual cascade group source end reports webmaster as maintenance information the place end defect indication information that extracts.
Further, the present invention has following characteristics: virtual cascade group source end is according to the place end defect indication information that extracts, judge whether to causing far-end virtual cascade group defective owing to the sequence identifier mistake, if, the legitimacy of the sequence identifier that sends of source end inspection then.
Compared with prior art, the present invention has the following advantages:
A, because this method is to utilize reserved field in the Virtual Concatenation multi-frame expense to return the indication of virtual cascade group far end defective, so the source end of Virtual Concatenation can be known the defect state of the virtual cascade group Su Duan that is positioned at far-end in time, conveniently carry out operation maintenance;
B, because this method is to utilize reserved field in the Virtual Concatenation multi-frame expense to return the indication of virtual cascade group far end defective, so for the source termination debit who does not support characteristic of the present invention, can ignore the defective indication of place end loopback, can't have influence on the processing of original multi-frame expense, thereby keep compatibility original multi-frame expense.
C, owing to can adopt the defect indication information of the loopback Su Duan of multi-frame sequence passback mode in this method, so can transmit more defects information, cause the reason of defective in order to differentiation, make things convenient for source end identification and safeguard.
Description of drawings
Fig. 1 is the form of available H4 multi-frame expense among the present invention;
Fig. 2 is the form of available K4 multi-frame expense among the present invention;
Fig. 3 is a flow chart of realizing correlation step of the present invention at virtual cascade group place end;
Fig. 4 is a flow chart of realizing correlation step of the present invention at virtual cascade group source end.
Embodiment
For understanding the present invention in depth, the present invention is described in detail below in conjunction with drawings and the specific embodiments.
In the realization of Virtual Concatenation technology, utilize Virtual Concatenation multi-frame expense (H4/K4 form) to transmit the information of Virtual Concatenation.But, there is not to be provided with maintenance information field in the current Virtual Concatenation multi-frame expense about virtual cascade group, so can't bring into play the advantage that SDH utilizes the abundant operation maintenance information of expense transmission, brought inconvenience for the operation maintenance of virtual cascade group.
Yet, in Virtual Concatenation multi-frame expense, no matter be high-order H4 multi-frame form or low order K4 multi-frame form, all has utilizable reserved field, just the reserved field in the high-order H4 multi-frame form is a lot, and the reserved field in the low order K4 multi-frame form is limited, as depicted in figs. 1 and 2.The present invention utilizes the virtual cascade group far end defective that returns in the Virtual Concatenation multi-frame expense to indicate just.
The performing step of this method includes:
Step 1, some fields of reserved field are used for the defect indication information of loopback virtual cascade group Su Duan in the selection Virtual Concatenation multi-frame expense, for convenience, can select the last bit of RS_ACK in the Virtual Concatenation multi-frame expense to be used for the defect indication information of loopback virtual cascade group Su Duan; In addition, the use of reserved field both can directly be used in this Virtual Concatenation multi-frame expense; Also can use by the multi-frame sequence;
Step 2, virtual cascade group Su Duan is according to detected local terminal defect state, respective field place in selected multi-frame expense reserved field is provided with the defect indication information of local terminal, and utilize the multi-frame expense to the described defect indication information of virtual cascade group source end loopback, can adopt dual modes such as single-bit passback and the passback of multi-frame sequence;
Step 3, virtual cascade group source end extracts described defect indication information from the multi-frame expense of place end loopback, and takes treatment measures, or reports webmaster as maintenance information, or after described defect indication information diagnosed, adopt the solution that presets to safeguard.
As shown in Figure 3, realize that at virtual cascade group place end the flow process of this method correlation step is as follows:
Step 301, initialization are used for the relevant position of the Virtual Concatenation multi-frame expense reserved field of virtual cascade group far end (Su Duan) defect indication information, promptly selected some fields or bit;
Step 302, virtual cascade group place end receiver side detects the defect state of local terminal, and generate defect indication information according to the reason that causes this defective, the reason of representing this place end virtual cascade group defective, this method can compatible LCAS (link capacity regulation mechanism) virtual cascade group and non-LCAS virtual cascade group, for the LCAS virtual cascade group, the reason of place end virtual cascade group defective comprises that the compensation of virtual cascade group differential delay is failed, all members' MFI (multiframe indicator) is asynchronous and SQ (sequence identifier) all members make mistakes, and for example the SQ value is illegal; And for non-LCAS virtual cascade group, the reason of place end virtual cascade group defective comprises that virtual cascade group differential delay compensation failure, any one member's MFI SQ asynchronous and any one member makes mistakes;
Step 303, virtual cascade group place end receiver side is inserted into reserved field position selected in the multi-frame expense with described defect indication information;
Step 304, virtual cascade group place end transmitter side returns defect indication information to virtual cascade group source end with the multi-frame expense, because what utilize is the bit of multi-frame expense, therefore can use dual modes such as single-bit passback and the passback of multi-frame sequence, return different amount of information respectively; When adopting single-bit directly to return mode, each virtual cascade group adopts the remote bug indication of the designated bit passback virtual cascade group in the multi-frame expense, can only whether have defective by indicating remote, can't distinguish the reason that causes defective; When adopting multi-frame sequence passback mode, each virtual cascade group can be transmitted more defects information, thereby be convenient to distinguish the reason that causes defective by the remote bug indication of the characteristic codes type passback virtual cascade group of multi-frame sequence.
As shown in Figure 4, realize that at virtual cascade group source end the flow process of this method correlation step is as follows:
Step 401, initialization are used to extract the relevant position of virtual cascade group far end defect indication information, promptly with selected multi-frame expense in the some fields or the corresponding position of bit of reserved field;
Step 402, virtual cascade group source end receiver side extracts the remote bug indication information from the multi-frame expense, as long as an available member's multi-frame information is arranged, virtual cascade group source end just can extract the defect indication information of Su Duan, identify the reason that causes defective thus, if during the equal non-availability of all members' multi-frame information, the source end can be thought remote bug has taken place;
Step 403, virtual cascade group source end is taked corresponding processing according to the remote bug indication information that extracts, and for example, reports webmaster as maintenance information the place end defect indication information that extracts; Or, after this defect indication information diagnosed, adopt the solution that presets to safeguard, for example, the source end judges whether to cause far-end virtual cascade group defective owing to the SQ mistake according to defect indication information, if, the legitimacy of the SQ that sends of source end inspection then.

Claims (8)

1, a kind of method that returns the indication of virtual cascade group far end defective comprises the steps:
(a) select some fields of reserved field in the Virtual Concatenation multi-frame expense to be used for the defect indication information of loopback virtual cascade group Su Duan;
(b) virtual cascade group Su Duan is according to detected local terminal defect state, and the respective field place of selected multi-frame expense is provided with the defect indication information of local terminal in step (a), and utilizes the multi-frame expense to the described defect indication information of virtual cascade group source end loopback.
2, the method for passback virtual cascade group far end defective indication according to claim 1 is characterized in that this method also comprises the steps:
Virtual cascade group source end extracts described defect indication information from the multi-frame expense of place end loopback, and takes measures areput.
3, the method for passback virtual cascade group far end defective indication according to claim 1 and 2 is characterized in that step (b) further can be divided into following steps:
(b1) end receiver side in virtual cascade group place detects the defect state of local terminal, and generates defect indication information according to this defect state;
(b2) end receiver side in virtual cascade group place is arranged at defect indication information at the respective field place of multi-frame expense selected in the step (a);
(b3) virtual cascade group place end transmitter side utilizes the defect indication information of multi-frame expense loopback local terminal.
4, the method for passback virtual cascade group far end defective indication according to claim 3 is characterized in that: the defect state of described local terminal comprises that the compensation of virtual cascade group differential delay is failed, all members' multiframe indicator sequence identifiers asynchronous and all members are made mistakes.
5, the method for passback virtual cascade group far end defective indication according to claim 3 is characterized in that: the defect state of described local terminal comprises that the compensation of virtual cascade group differential delay is failed, any one member's multiframe indicator sequence identifier asynchronous and any one member is made mistakes.
6, the method for passback virtual cascade group far end defective indication according to claim 3 is characterized in that: virtual cascade group place end utilizes the mode of the defect indication information of multi-frame expense loopback local terminal to comprise single-bit passback mode and multi-frame sequence passback mode.
7, the method for passback virtual cascade group far end defective indication according to claim 6, it is characterized in that: virtual cascade group source end reports webmaster as maintenance information the place end defect indication information that extracts.
8, the method for passback virtual cascade group far end defective indication according to claim 6, it is characterized in that: virtual cascade group source end is according to the place end defect indication information that extracts, when causing far-end virtual cascade group defective owing to the sequence identifier mistake, the legitimacy of the sequence identifier that source end inspection sends.
CNB2005100855068A 2005-07-22 2005-07-22 Method for backward transmitting virtual cascade group far end flaw indication Expired - Fee Related CN100440770C (en)

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Publication number Priority date Publication date Assignee Title
CN101145842B (en) * 2007-06-14 2012-04-18 中兴通讯股份有限公司 A method for indicating remote bug

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1446020A (en) * 1995-10-18 2003-10-01 艾利森电话股份有限公司 Method and equipment for enhancing function by reserving field
CN1464691A (en) * 2002-06-24 2003-12-31 华为技术有限公司 Mapping and demapping method between data packet and SDH frame structure of Ethernet
CN1553633A (en) * 2003-05-29 2004-12-08 中兴通讯股份有限公司 Virtual linkage combination time gap regulating method
CN1558636A (en) * 2004-01-20 2004-12-29 北京邮电大学 Method for synchronous switching of source end and sinking end in traffic flow rerouting
CN1633118A (en) * 2003-12-24 2005-06-29 华为技术有限公司 Method for obtaining minimum multiframe number in virtual cascade group during virtual cascade processing

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1446020A (en) * 1995-10-18 2003-10-01 艾利森电话股份有限公司 Method and equipment for enhancing function by reserving field
CN1464691A (en) * 2002-06-24 2003-12-31 华为技术有限公司 Mapping and demapping method between data packet and SDH frame structure of Ethernet
CN1553633A (en) * 2003-05-29 2004-12-08 中兴通讯股份有限公司 Virtual linkage combination time gap regulating method
CN1633118A (en) * 2003-12-24 2005-06-29 华为技术有限公司 Method for obtaining minimum multiframe number in virtual cascade group during virtual cascade processing
CN1558636A (en) * 2004-01-20 2004-12-29 北京邮电大学 Method for synchronous switching of source end and sinking end in traffic flow rerouting

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