CN102647301B - Alarm information transmitting method, related equipment and system - Google Patents
Alarm information transmitting method, related equipment and system Download PDFInfo
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- CN102647301B CN102647301B CN201210125409.7A CN201210125409A CN102647301B CN 102647301 B CN102647301 B CN 102647301B CN 201210125409 A CN201210125409 A CN 201210125409A CN 102647301 B CN102647301 B CN 102647301B
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Abstract
The inventive embodiment discloses an alarm information transmitting method, related equipment and system for transmitting CPU (central processing unit) fault alarm information of a SDH (synchronous digital hierarchy) network element. The method comprises the following steps: in first network element equipment, a SDH framer packages to-be-transmitted data to obtain a SDH frame; a CPU control processor interface unit inserts first information in overhead byte of the SDH frame; the SDH framer transmits the SDH frame to an optical channel; in second network element equipment adjacent to the first network element equipment, a SDH deframer receives the SDH frame transmitted by the SDH framer in the first network element equipment from the optical channel, extracts the first information carried by the overhead byte in the SDH frame, and indicates the processor interface unit to transmit the first information to a CPU; and the CPU in the second network element equipment receives the first information, determines that a fault occurs in first network element equipment if the first information meets the preset condition, and sends a fault alarm information to a network management server.
Description
Technical field
The present invention relates to field of data communication technology, particularly relate to warning information transfer approach, relevant device and system in a kind of SDH (Synchronous Digital Hierarchy) (SDH, Synchronous Digital Hierarchy).
Background technology
Along with developing rapidly of data communication, the requirement of people to transfer of data is also more and more higher, and synchronous digital hierarchy SDH is also constantly being widely used.In SDH system, the management for synchronous digital transmission equipment is a very important technology contents.In synchronous digital transmission equipment management, the managerial demand for multiple network element transmits management information by means of the expense (Overhead, in data flow, the content of non-net load, is mainly used in network operation) in data link.This mode is usually using optical channel (passage for optical signal transmission) as hardware transport medium, and the expense in use optical channel carries out the information transmission between multiple network element.
In prior art, usually, when breaking down in the transfer of data between synchronous digital transmission equipment (SDH network element or SDH equipment can be called for short), the network element relevant to fault can monitor fault, the engine of the communication in each network element---central processing unit (CPU, Central Processing Unit) gather alarm signal, and report to NM server by management channels.If constitute fiber optic network by 4 SDH network elements N1, N2, N3 and N4, if there occurs fiber cut failure between N1, N2, the alarm that network element N1 and N2 relevant to fault can have reception unglazed, the unglazed alarm of receipts is sent to N4 from N3 by N2, and the unglazed alarm of receipts sends to N4 by N1, at this moment, the warning information that the CPU that the NM server being connected to N4 just can receive N1 and N2 respectively sends, thus realize malfunction monitoring.
In some cases, such as, although management channels itself is normal, but the CPU of certain network element is because of cause specific (the crystal oscillator damage etc. of CPU work clock) fault in fiber optic network, now, NM server just cannot receive the warning information of this fault, also just cannot find the network element broken down, be not easy to keep in repair fault network element in time, have impact on the transfer of data between SDH network element.
Summary of the invention
Embodiments provide a kind of warning information transfer approach, relevant device and system, for transmitting the warning information of cpu fault in SDH network element.
For the problem of above-mentioned proposition, embodiments provide:
A kind of warning information transfer approach, comprising:
SDH (Synchronous Digital Hierarchy) SDH framer in first network element device carries out encapsulation to sent data and obtains SDH frame;
The processor interface unit that central processor CPU in first network element device controls in the first network element device inserts the first information to the overhead byte in SDH frame;
Described SDH frame is sent in optical channel by the SDH framer in the first network element device;
Second network element device adjacent with described first network element device, the SDH frame that the SDH framer that SDH deframer in described second network element device receives in the first network element device from optical channel transmits, frame synchronization is carried out to described SDH frame, in described SDH frame, extract the first information of overhead byte carrying, and indicate the processor interface unit in the second network element device to send the described first information to the CPU in the second network element device;
CPU in second network element device receives the described first information, judges whether the described first information meets prerequisite, if the described first information meets prerequisite, then determines that the first network element device breaks down, and transmits fault warning information to NM server.
Wherein, describedly judge whether the described first information meets prerequisite, comprising:
Judge whether the described first information is the warning information being used to indicate cpu fault, if so, then judge further the described first information whether periodic variation, if the described first information is not periodic variation, then determine that the described first information meets prerequisite.
Described overhead byte comprises X byte or Y byte.
The present invention also provides a kind of network element device, comprising:
Central processor CPU, processor interface unit, SDH (Synchronous Digital Hierarchy) SDH framer, SDH deframer, wherein,
Described SDH framer, obtains SDH frame for carrying out encapsulation to sent data;
Described CPU, inserts the first information for control processor interface unit to the overhead byte in SDH frame;
Described processor interface unit, for inserting the control command of the first information to overhead byte in SDH frame according to described CPU, inserts the first information to the overhead byte in SDH frame;
Described SDH framer, also for being sent in optical channel by described SDH frame;
Described SDH deframer, for the SDH frame that the SDH framer received from optical channel in adjacent net element device transmits, and carry out frame synchronization, in described SDH frame, extract the second information of overhead byte carrying, and indicate described processor interface unit to send described second information to described CPU; Described second information is in described adjacent net element device, the information of overhead byte carrying in the SDH frame formed in its SDH framer;
Described processor interface unit, also for reading the second information that described SDH deframer sends, and sends described second information to CPU;
Described CPU, also for receiving described second information, judge whether described second information meets prerequisite, if described second information meets prerequisite, then determine that the network element device adjacent with described network element device breaks down, and transmit fault warning information to NM server.
After described CPU receives described second information, specifically for:
Judge whether described second information is the warning information being used to indicate cpu fault, if, then judge further described second information whether periodic variation, if described second information is not periodic variation, then determine that the network element device adjacent with described network element device breaks down, and transmit described fault warning information to NM server.
The present invention also provides a kind of warning information transfer system, comprising:
Two or more network element device as above, and NM server,
The fault warning information that described NM server transmits for receiving described network element device.As can be seen from the above technical solutions, embodiments provide a kind of warning information transfer approach, relevant device and system, the overhead byte in SDH frame is utilized to carry the warning information being used to indicate SDH network element failure, especially the warning information of the cpu fault of network element, make the webserver find the network element of fault in time according to the warning information of cpu fault and keep in repair, ensure the normal transmission of data between SDH network element.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, be briefly described describing the required accompanying drawing used to embodiment below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The flow chart of a kind of warning information transfer approach that Fig. 1 provides for the embodiment of the present invention;
The structural representation of a kind of warning information transfer equipment that Fig. 2 provides for the embodiment of the present invention;
The structural representation of a kind of warning information transfer system that Fig. 3 provides for the embodiment of the present invention.
Embodiment
Embodiments provide a kind of warning information transfer approach, relevant device and system, for transmitting the warning information of cpu fault in SDH network element.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
Below be described in detail respectively.
Please refer to Fig. 1, the flow chart of a kind of warning information transfer approach that Fig. 1 provides for the embodiment of the present invention, wherein, the method comprises:
SDH (Synchronous Digital Hierarchy) SDH framer in S101, the first network element device carries out encapsulation to sent data and obtains SDH frame;
In some embodiments, the warning information transfer approach that this embodiment provides, its executive agent can be synchronous digital transmission equipment, can referred to as SDH network element or SDH equipment.
Be understandable that, SDH (Synchronous Digital Hierarchy), i.e. SDH (Synchronous Digital Hierarchy), is the technology about digital multiplexing, is widely used in fiber optic communication field, its standard be ITU-T G.707.
The processor interface unit that central processor CPU in S102, the first network element device controls in the first network element device inserts the first information to the overhead byte in SDH frame;
Normally, the central processor CPU (CentralProcessing Unit) adopted in every platform synchronous digital transmission equipment, general all with operating system, namely Embedded processor, such as ARM7 (Advanced RISC Machines 7), the cpu system of ARM9, ARM11 kernel.
Be understandable that, in synchronous digital transmission equipment management, for the managerial demand of multiple network element by means of the expense (Overhead in data link, the content of non-net load in data flow, be mainly used in network operation) transmit management information, this also can think that expense achieves the monitoring to synchronous digital transmission equipment in SDH system.
In addition, expense, in digital multiplexing field, just refers to the extra bit or byte that insert in digital multiplexing process, because SDH is the mode adopting byte multiplexing, so the expense of SDH all realizes with bytewise.
SDH frame is sent in optical channel by the SDH framer in S103, the first network element device;
S104, second network element device adjacent with the first network element device, the SDH frame that the SDH framer that SDH deframer in second network element device receives in the first network element device from optical channel transmits, frame synchronization is carried out to described SDH frame, in described SDH frame, extract the first information of overhead byte carrying, and indicate the processor interface unit in the second network element device to send the described first information to the CPU in the second network element device;
According to standard I TU-T G.707, SDH has frame swynchronization code A1, A2 in the frame structure, in order to correctly distinguish the content in high speed serialization code stream, first must find this synchronous code in this serial code stream, utilize synchronous code to locate, determine the ordering of subsequent content.The object of frame synchronization that Here it is, as long as namely located, just can find required content.
Be understandable that, in the present embodiment, the processor interface unit in the first network element device and the processor interface unit in the second network element device all have address decoding, address extension, or the function such as driving.
CPU in S105, the second network element device receives the first information, judges whether the first information meets prerequisite, if the first information meets prerequisite, then determines that the first network element device breaks down, and transmits fault warning information to NM server.
Be understandable that, in the frame structure of SDH, comprise multiple overhead byte, what have defines its purposes by international standard, also has some to be reserved for subsequent use, as X byte and Y byte etc.Practice finds, these overhead bytes mutually transmit between adjacent SDH network element, is suitable for the warning information transmitting SDH network element device fault, as the warning information of cpu fault; In the present embodiment, overhead byte, except using X byte and Y byte, can also use other spare bytes, does not do concrete restriction herein.
In addition, overhead byte is as X byte, Y byte and some other spare bytes, and it is also the warning information that can transmit other non-cpu fault faults, wherein, non-cpu fault can comprise: such as, at hardware aspect, there is provided the crystal oscillator of CPU work clock to damage, cause CPU to work; In software, there is leak (BUG) in program, the statement of adjudicating as certain condition is made mistakes, and enters endless loop, causes CPU cannot perform other task dispatching.But according to relevant international standard, be similar to this kind of alarm or management information normally utilizes the D1-D12 byte in SDH frame structure to carry.Wherein, D1-D12 byte is called digital communications path (DCC) byte, and D1-D3 is used for regenerator section (DCCR), and D4-D12 is used for multiplex section (DCCM).
Preferably, the CPU in the second network element device judges whether the first information meets prerequisite, can comprise:
CPU in second network element device judges whether the first information is the warning information being used to indicate cpu fault, if, then judge the first information whether periodic variation further, if the first information is not periodic variation, then determine that the first information meets prerequisite.
After judging that the first information meets prerequisite, then can determine and to break down with adjacent network element device, particularly, determine that the CPU in the first network element device adjacent with the second network element device there occurs fault, and transmit fault warning information, to keep in repair the network element device broken down in time to NM server.
Be understandable that, CPU in second network element device judges whether the first information is the warning information being used to indicate cpu fault, be in order to get rid of be not instruction cpu fault warning information, and further judge, if the first information is periodic variation, then can determine that the CPU in the first network element device adjacent with the second network element device does not break down, working properly, on the contrary, if the first information is not periodic variation, then can determine that the CPU in the first network element device adjacent with the second network element device there occurs fault, and transmit fault warning information to NM server, to keep in repair the network element device broken down in time.
From the above, embodiments provide a kind of warning information transfer approach, the overhead byte in SDH frame is utilized to carry the warning information being used to indicate SDH network element failure, especially the warning information of the cpu fault of network element, make the webserver find the network element of fault in time according to the warning information of cpu fault and keep in repair, ensure the normal transmission of data between SDH network element.
For ease of better implementing the technical scheme of the embodiment of the present invention, the embodiment of the present invention is also provided for relevant device and the system of implementing above-mentioned warning information transfer approach.Wherein the implication of noun is identical with the method that above-mentioned parameter is downloaded, and specific implementation details can explanation in reference method embodiment.
Please refer to Fig. 2, the structural representation of a kind of warning information transfer equipment that Fig. 2 provides for the embodiment of the present invention, wherein, this warning information transfer equipment 200 comprises:
Central processor CPU 201, processor interface unit 202, SDH (Synchronous Digital Hierarchy) SDH framer 203, SDH deframer 204, wherein,
SDH framer 203, obtains SDH frame for carrying out encapsulation to sent data;
CPU201, inserts the first information for control processor interface unit 202 to the overhead byte in SDH frame;
Processor interface unit 202, for inserting the control command of the first information to overhead byte in SDH frame according to CPU201, inserts information to the overhead byte in SDH frame;
SDH framer 203, also for being sent in optical channel by SDH frame;
SDH deframer 204, for the SDH frame that the SDH framer received from optical channel in adjacent net element device transmits, and carry out frame synchronization, in described SDH frame, extract the second information of overhead byte carrying, and instruction processorunit interface unit 202 sends the second information to CPU201; Described second information is in described adjacent net element device, the information of overhead byte carrying in the SDH frame formed in its SDH framer;
Processor interface unit 202, also for reading the second information that SDH deframer 204 sends, and sends this second information to CPU201;
CPU201, also for receiving the second information, judges whether this second information meets prerequisite, if the second information meets prerequisite, then determines that the network element device adjacent with described network element device breaks down, and transmits fault warning information to NM server.
Wherein, the overhead byte in SDH frame can comprise X byte or Y byte or other bytes for subsequent use.
Preferably, after CPU201 receives the second information, specifically for:
Judge whether described second information is the warning information being used to indicate cpu fault, if, then judge further described second information whether periodic variation, if described second information is not periodic variation, then determine that the network element device adjacent with described network element device breaks down, and transmit described fault warning information to NM server, to keep in repair the network element device broken down in time.
Preferably, the warning information transfer equipment that the embodiment of the present invention provides can be SDH equipment, and wherein, network element device adjacent with it also can be SDH equipment.
It should be noted that, each unit module in the warning information transfer equipment of the embodiment of the present invention: CPU201, processor interface unit 202, SDH framer 203, SDH deframer 204, can as the CPU in above-mentioned embodiment of the method, processor interface unit, SDH framer, SDH deframer, may be used for the whole technical schemes realized in said method embodiment, the function of each functional module can according to the method specific implementation in said method embodiment, its specific implementation process can refer to the associated description in above-described embodiment, repeats no more herein.
From the above, embodiments provide a kind of warning information transfer equipment, the overhead byte in SDH frame is utilized to carry the warning information being used to indicate SDH network element failure, especially the warning information of the cpu fault of network element, make the webserver find the network element of fault in time according to the warning information of cpu fault and keep in repair, ensure the normal transmission of data between SDH network element.
Please refer to Fig. 3, the structural representation of a kind of warning information transfer system that Fig. 3 provides for the embodiment of the present invention, wherein, this warning information transfer system comprises:
Two or more warning information transfer equipment 301 and NM server 302, wherein,
The warning information transfer equipment that warning information transfer equipment 301 adopts above-described embodiment to provide,
The fault warning information that NM server 302 transmits for receiving alarm information-transmission apparatus 301.
Preferably, the warning information transfer equipment 301 that the embodiment of the present invention provides can be SDH equipment, and wherein, network element device adjacent with it also can be SDH equipment.
It should be noted that, warning information transfer equipment 301 in the system that the embodiment of the present invention provides and NM server 302 can respectively as the warning information transfer equipment in said apparatus embodiment and NM servers, its specific implementation process can refer to the associated description in above-described embodiment, repeats no more herein.
From the above, embodiments provide a kind of warning information transfer system, the overhead byte in SDH frame is utilized to carry the warning information being used to indicate SDH network element failure, especially the warning information of the cpu fault of network element, make the webserver find the network element of fault in time according to the warning information of cpu fault and keep in repair, ensure the normal transmission of data between SDH network element.
For ease of understanding, being described below with an embody rule scene to above-mentioned warning information transfer approach, relevant device and system, wherein, under this application scenarios, take overhead byte as Y byte is example:
SDH framer in first network element device carries out encapsulation to sent data and obtains SDH frame; CPU control processor interface unit 202 in first network element device inserts the first information to the overhead byte in SDH frame; Wherein, the first information to the overhead byte insertion in SDH frame is the data by software simulating automatic turning, and the information of namely Y byte carrying also can realize automatic turning; Thereafter, SDH frame is sent in optical channel by the SDH framer in the first network element device;
Be understandable that, CPU can be timing upset to the information that the Y byte in SDH frame is inserted, and such as certain moment inserts " AA ", after cycle T, upset is " 55 ", can overturn as " AA " after cycle T more again, so move in circles, the information of insertion is periodic variation.
Second network element device adjacent with the first network element device, SDH deframer wherein, receives the SDH frame of the SDH framer transmission in the first network element device, and carries out frame synchronization to described SDH frame from optical channel, in this SDH frame, extract the information of Y byte carrying, namely extract the first information.The information of Y byte carrying can be sent to the CPU in the second network element device through processor interface unit 202, now, first CPU in second network element device judges whether the information that Y byte carries is the warning information being used to indicate cpu fault, object is to filter received Y byte, remove the information of other non-instruction cpu fault alarms, it is the warning information being used to indicate cpu fault if judge, then judge information that Y byte carries whether periodic variation further, if the information of Y byte carrying is periodic variation, then can determine that the CPU in SDH equipment adjacent with it does not break down, namely determine that the first network element device adjacent with the second network element device is working properly, on the contrary, if the information of overhead byte carrying is not periodic variation, then can determine and there occurs fault with the CPU in the first network element device adjacent with the second network element device, CPU in second network element device transmits fault warning information to NM server, to keep in repair the first network element device broken down in time.
From the above, embodiments provide a kind of warning information transfer approach, relevant device and system, the overhead byte in SDH frame is utilized to carry the warning information being used to indicate SDH network element failure, especially the warning information of the cpu fault of network element, make the webserver find the network element of fault in time according to the warning information of cpu fault and keep in repair, ensure the normal transmission of data between SDH network element.
Those skilled in the art can be well understood to, and for convenience and simplicity of description, the system of foregoing description, the specific works process of device and unit, with reference to the corresponding process in preceding method embodiment, can not repeat them here.
In several embodiments that the application provides, should be understood that, disclosed system, apparatus and method, can realize by another way.Such as, device embodiment described above is only schematic, such as, the division of described unit, be only a kind of logic function to divide, actual can have other dividing mode when realizing, such as multiple unit or assembly can in conjunction with or another system can be integrated into, or some features can be ignored, or do not perform.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be by some interfaces, and the indirect coupling of device or unit or communication connection can be electrical, machinery or other form.
The described unit illustrated as separating component or can may not be and physically separates, and the parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of unit wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, also can be that the independent physics of unit exists, also can two or more unit in a unit integrated.Above-mentioned integrated unit both can adopt the form of hardware to realize, and the form of SFU software functional unit also can be adopted to realize.
If described integrated unit using the form of SFU software functional unit realize and as independently production marketing or use time, can be stored in a computer read/write memory medium.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words or all or part of of this technical scheme can embody with the form of software product, this computer software product is stored in a storage medium, comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) perform all or part of step of method described in each embodiment of the present invention.And aforesaid storage medium comprises: USB flash disk, portable hard drive, read-only memory (ROM, Read-OnlyMemory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. various can be program code stored medium.
Above a kind of warning information transfer approach provided by the present invention, relevant device and system are described in detail, for one of ordinary skill in the art, according to the thought of the embodiment of the present invention, all will change in specific embodiments and applications, to sum up, this description should not be construed as limitation of the present invention.
Claims (6)
1. a warning information transfer approach, is characterized in that, comprising:
SDH (Synchronous Digital Hierarchy) SDH framer in first network element device carries out encapsulation to sent data and obtains SDH frame;
The processor interface unit that central processor CPU in first network element device controls in the first network element device inserts the first information to the overhead byte in SDH frame, and the described first information is periodic variation;
Described SDH frame is sent in optical channel by the SDH framer in the first network element device;
Second network element device adjacent with described first network element device, the SDH frame that the SDH framer that SDH deframer in described second network element device receives in the first network element device from optical channel transmits, frame synchronization is carried out to described SDH frame, in described SDH frame, extract the first information of overhead byte carrying, and indicate the processor interface unit in the second network element device to send the described first information to the CPU in the second network element device;
CPU in second network element device receives the described first information, judge whether the described first information is the warning information being used to indicate cpu fault, if, then judge further the described first information whether periodic variation, if the described first information is not periodic variation, then determine that the described first information meets prerequisite;
If the described first information meets prerequisite, then determine that the first network element device breaks down, and transmit fault warning information to NM server.
2. method according to claim 1, is characterized in that, describedly judges whether the described first information meets prerequisite, comprising:
Judge whether the described first information is the warning information being used to indicate cpu fault, if so, then judge further the described first information whether periodic variation, if the described first information is not periodic variation, then determine that the described first information meets prerequisite.
3. method according to claim 1 and 2, is characterized in that,
Described overhead byte comprises X byte or Y byte.
4. a network element device, is characterized in that, comprising:
Central processor CPU, processor interface unit, SDH (Synchronous Digital Hierarchy) SDH framer, SDH deframer, wherein,
Described SDH framer, obtains SDH frame for carrying out encapsulation to sent data;
Described CPU, insert the first information for control processor interface unit to the overhead byte in SDH frame, the described first information is periodic variation;
Described processor interface unit, for inserting the control command of the first information to overhead byte in SDH frame according to described CPU, inserts the first information to the overhead byte in SDH frame;
Described SDH framer, also for being sent in optical channel by described SDH frame;
Described SDH deframer, for the SDH frame that the SDH framer received from optical channel in adjacent net element device transmits, and carry out frame synchronization, in described SDH frame, extract the second information of overhead byte carrying, and indicate described processor interface unit to send described second information to described CPU; Described second information is in described adjacent net element device, the first information of overhead byte carrying in the SDH frame formed in its SDH framer;
Described processor interface unit, also for reading the second information that described SDH deframer sends, and sends described second information to CPU;
Described CPU, also for receiving described second information, judge whether described second information is the warning information being used to indicate cpu fault, if, then judge further described second information whether periodic variation, if described second information is not periodic variation, then determines that the network element device adjacent with described network element device breaks down, and transmit described fault warning information to NM server.
5. network element device according to claim 4, is characterized in that,
After described CPU receives described second information, specifically for:
Judge whether described second information is the warning information being used to indicate cpu fault, if, then judge further described second information whether periodic variation, if described second information is not periodic variation, then determine that the network element device adjacent with described network element device breaks down, and transmit described fault warning information to NM server.
6. a warning information transfer system, is characterized in that, comprising:
Two or more network element device as described in claim 4 or 5, and NM server,
The fault warning information that described NM server transmits for receiving described network element device.
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| CN1498471A (en) * | 2001-01-16 | 2004-05-19 | �����Ӣ��֪ʶ��Ȩ����˾ | Alarm signal suppression in telecommunications networks |
| CN101247178A (en) * | 2008-03-19 | 2008-08-20 | 烽火通信科技股份有限公司 | Power-down alarm transmission method of compact synchronous digital transmission equipment |
| CN101527609A (en) * | 2008-03-03 | 2009-09-09 | 中兴通讯股份有限公司 | Method for transferring alarm information, device for sending alarm information and device for receiving same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1498471A (en) * | 2001-01-16 | 2004-05-19 | �����Ӣ��֪ʶ��Ȩ����˾ | Alarm signal suppression in telecommunications networks |
| CN101527609A (en) * | 2008-03-03 | 2009-09-09 | 中兴通讯股份有限公司 | Method for transferring alarm information, device for sending alarm information and device for receiving same |
| CN101247178A (en) * | 2008-03-19 | 2008-08-20 | 烽火通信科技股份有限公司 | Power-down alarm transmission method of compact synchronous digital transmission equipment |
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