CN101534163A - Method for testing optical plate and device thereof - Google Patents
Method for testing optical plate and device thereof Download PDFInfo
- Publication number
- CN101534163A CN101534163A CN200810084953A CN200810084953A CN101534163A CN 101534163 A CN101534163 A CN 101534163A CN 200810084953 A CN200810084953 A CN 200810084953A CN 200810084953 A CN200810084953 A CN 200810084953A CN 101534163 A CN101534163 A CN 101534163A
- Authority
- CN
- China
- Prior art keywords
- sdh
- frame
- test
- frame signal
- cross board
- 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.)
- Granted
Links
Images
Abstract
The invention discloses a method for testing an optical plate, comprising the following steps: a. a network management system issues a testing instruction to a cross plate and the cross plate generates an SDH testing frame signal according to the received instruction and sends the SDH testing frame signal to the optical plate; b. the optical plate receives the testing frame signal sent by the cross plate and transfers the testing frame signal to the cross plate by a service loop; c. the cross plate analyzes the SDH testing frame signal and reports the obtained testing result to the network management system. The invention also discloses a device for testing the optical plate simultaneously; wherein the device comprises the optical plate, the cross plate and the network management system; SDH frame generators and frame monitors are newly added in each testing passage of the cross plate so that the cross plate has the functions of generating the testing frame and analyzing the monitoring frame; and the testing result of the optical plate can be obtained by analyzing the testing frame signal of the optical plate. The method needs no SDH testers, can carry out parallel test to a plurality of optical plates simultaneously, and improves the testing efficiency.
Description
Technical field
The present invention relates to the measuring technology of the optical transmission device of the communications field, relate in particular to a kind of method and device thereof of bare board test.
Background technology
In SDH (SDH (Synchronous Digital Hierarchy)) optical transmission system, often need test the tabula rasa at production and engineering construction scene, can satisfy the requirement of optical transport technology index to determine the tabula rasa product.Described tabula rasa is the abbreviation of Optical Fiber Interface Board.
Fig. 1 is the connected mode schematic diagram of SDH tester and each tabula rasa in the existing bare board test device, as shown in Figure 1, tested tabula rasa links to each other with the SDH tester by optical fiber, the receipts optical port of tested tabula rasa connects the luminous port of SDH tester, the luminous port of tested tabula rasa connects the receipts optical port of SDH tester, business is looped back to tested tabula rasa by cross board, can test indexs such as tabula rasa error code by the SDH tester, determines that can the tabula rasa product satisfy the requirement of optical transport technology index.If need must the tabula rasa optical port be connected with the SDH tester by mode manual or increase optical port switching device shifter to the polylith tabula rasa, when a plurality of optical port is tested, just can test.But can simplify under the error code testing situation, this conventional test methodologies needs expensive test instrumentation, and needs time-consuming manual operation, so automaticity is not high, and testing efficiency is lower.
Application number is CN200510056484.2, disclose a kind of SDH of employing tester in the patent application document of denomination of invention for " utilizing false module to realize the method and the device of bare board test " and arrived the multiplexing of two-forty tabula rasa by the low rate tabula rasa, realize the scheme of the test of two-forty tabula rasa, its method is as follows: the SDH tester is sent to the normal tabula rasa that has optical module with business by optical fiber; The cross board of configuration SDH will be crossed on the tested tabula rasa that has false optical module through the business after the normal tabula rasa conversion; The optical module of the vacation on the tested tabula rasa is sent to service loop on the normal tabula rasa through cross board, sends it back the SDH tester by optical fiber after normal tabula rasa conversion, and realization SDH tester is tested tested tabula rasa.This method is by the connection that utilizes false module and utilizes the multiplexing function of cross board to realize that the low rate tabula rasa is multiplexing to the speed of two-forty tabula rasa, and adopts the SDH tester to realize the test of two-forty tabula rasa.But use this method when a large amount of tabula rasas is tested, still to have complicated operating process and the low deficiency of testing efficiency.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method of bare board test, can test polylith tabula rasa, a plurality of optical port concurrently, improves testing efficiency, thereby reduces testing cost.
Another object of the present invention is to provide a kind of device of bare board test, can test polylith tabula rasa, a plurality of optical port concurrently, improves testing efficiency, thereby reduces testing cost.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of device of bare board test, this device comprise tabula rasa, cross board and network management system three parts; Described cross board further comprises SDH (Synchronous Digital Hierarchy) SDH frame transmitter, SDH frame grabber and channel controller, also comprises SDH frame maker, SDH frame watch-dog on the described cross board; Wherein,
Tabula rasa is used to receive the SDH test frame signal that the SDH frame transmitter of cross board is sent, and with described SDH test frame signal again loopback give the SDH frame grabber of cross board;
Cross board is used to send multichannel SDH test frame signal and receives and analyze SDH test frame signal, then test result is reported network management system;
Network management system is used to control cross board and tabula rasa and carries out test job, and outputs test result and the analysis report of corresponding test result;
SDH frame maker is used for being used for testing the SDH test frame signal of error code according to the instruction generation that network management system is sent out by channel controller, and is sent to SDH frame transmitter;
SDH frame transmitter is used for giving tabula rasa to be measured with the test frame signal forwarding from SDH frame maker;
The SDH frame grabber is used to receive the SDH test frame signal by tabula rasa institute loopback, and the data clock of finishing described frame signal recovers, frame synchronization is located and the function of frame alignment, and described frame signal is transmitted to SDH frame watch-dog;
SDH frame watch-dog is used to receive the SDH test frame signal that the SDH frame grabber sent described test frame signal is carried out frame alarm detection and bit error analyzing, and sends test result to channel controller;
Channel controller, the one or more test channel of described cross board and the generation of corresponding SDH test frame signal are controlled in the order that is used to receive network management system, simultaneously, also be used for according to the test result and the analytical test result of the SDH frame watch-dog of the instruction of network management system inquiry test channel and report network management system.
A kind of method of bare board test, this method comprises:
A, network management system issue test instruction to cross board, and cross board produces SDH test frame signal and is sent to tabula rasa according to the instruction of being received;
B, tabula rasa receive the test frame signal that cross board sends, by service loop with described test frame signal forwarding to cross board;
C, cross board are analyzed described SDH test frame signal, and resulting test result are reported network management system.
Wherein, the described network management system of step a issues test instruction to cross board, is to finish by the channel controller of cross board.
The described cross board of step a produces SDH test frame signal and is sent to tabula rasa, is meant after SDH frame maker produces SDH test frame signal described signal is forwarded to tabula rasa to be measured through SDH frame transmitter.
Described test frame signal is a kind of in the SDH synchronous transfer mode STM-N frame signal, wherein: N=1,4,16,64.
Carry the pseudo random sequence PRBS sign indicating number that SDH frame maker is produced in the information payload district of described test frame signal.
The described tabula rasa of step b by service loop with described test frame signal forwarding to cross board, be SDH test frame signal by receiving by the SDH frame grabber of cross board behind the tabula rasa, and the data clock of finishing described frame signal recover, be sent to SDH frame watch-dog again after the function of frame synchronization location and frame alignment.
The described cross board of step c is analyzed described SDH test frame signal, is that the SDH frame watch-dog of cross board is analyzed described SDH test frame signal.
The process that described SDH frame watch-dog is analyzed SDH test frame signal is: SDH frame watch-dog carries out synchronous detecting to the PRBS sign indicating number in the described test frame information payload district, if it is asynchronous, then provide the alarm indication of pseudo random sequence synchronization loss PLOS, as test result, and the detection of end process; If synchronously, then utilize the original PRBS sign indicating number step-by-step in SDH frame watch-dog self PRBS sign indicating number that produces and the SDH test frame that is received to compare, and add up the warning information that comprises information payload error code TSE, as test result.
Step c is described to report network management system with resulting test result, is that the test result that will obtain by SDH frame watch-dog is transmitted to network management system through channel controller.
Described SDH frame maker produces the different STM-N test frame signal of standard speed grade, finally transfers to SDH frame watch-dog through tabula rasa, and by described frame watch-dog described test frame signal is analyzed.
The method of realization bare board test provided by the present invention and device thereof have the following advantages:
The present invention makes cross board have the function that produces the SDH test frame by increased SDH frame maker newly in cross board inside, make cross board possess the function of analysis and control and measuring frame by newly-increased SDH frame watch-dog, in conjunction with channel controller, network management system to testing through the signal after the tabula rasa sending and receiving, can draw the test result of institute's photometry plate, this method does not need expensive SDH tester, simultaneously, there are a plurality of test channel cross board inside, thereby can walk abreast simultaneously a plurality of tabula rasas are tested, improved testing efficiency.
Description of drawings
Fig. 1 is the connected mode schematic diagram of SDH tester and each tabula rasa in the existing bare board test device;
Fig. 2 is the system configuration schematic diagram of bare board test device in the embodiment of the invention;
Fig. 3 is the test process schematic diagram of bare board test in the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing and embodiments of the invention method of the present invention is described in further detail.
Fig. 2 is the system configuration schematic diagram of bare board test device in the embodiment of the invention, and as shown in Figure 2, this device comprises tabula rasa 200, cross board 201 and network management system 202.Cross board 201 includes a channel controller 2015 and a plurality of test channel is test channel 1～test channel n; Each test channel comprises SDH frame maker 2011, SDH frame transmitter 2012, SDH frame grabber 2013, SDH frame watch-dog 2014; Each test channel can connect a tabula rasa to be tested 200.In the practical application, have a plurality of optical ports on the tabula rasa, therefore, a tabula rasa also can connect a plurality of test channel.Wherein,
Cross board 201 is used to send multichannel SDH test frame signal and receives and analyze SDH test frame signal, then test result is reported network management system 202.
Here, described SDH frame grabber is according to functions such as clock recovery, frame synchronization location, frame alignment and the verifications of B1 byte, can also provide the test result of test frame signal, as: warning information such as dropout (LOS), OOF alarm (OOF), alarm indication signal (AIS) and B1 byte error code.
Described frame synchronization location is that institute's transmitting data stream is detected, and finds the position of frame head A1, A2, so that current test frame signal is analyzed.
Described frame alignment is the position that the data flow that a plurality of test channel are received snaps to the synchronizing frame head of cross board inside.
The verification of described B1 byte is used for regenerator section bit error is monitored.
SDH frame watch-dog 2014 is used to receive the SDH test frame signal that SDH frame grabber 2013 is sent, and described test frame signal is carried out frame alarm detection and bit error analyzing, and send test result to channel controller 2015.
Here, described SDH test frame signal is carried out frame alarm detection and bit error analyzing, comprise detection and analysis projects such as pseudo random sequence synchronization loss alarm detection such as (PLOS) and information payload error code (TSE) performance evaluation.
Channel controller 2015, the one or more test channel of described cross board 201 and the generation of corresponding SDH test frame signal are controlled in the order that is used to receive network management system 202, simultaneously, also be used for according to the test result and the analytical test result of the SDH frame watch-dog 2014 of the instruction of network management system inquiry test channel and report network management system 202.
Fig. 3 is the test process schematic diagram of bare board test in the embodiment of the invention, and as shown in Figure 3, this method comprises:
Step 301: network management system issues test instruction to cross board, and the SDH frame maker of cross board produces SDH test frame signal, and by SDH frame transmitter the test frame signal is sent to tabula rasa.
Here, to produce SDH test frame signal be that the test instruction of the network management system transmitted according to channel controller realizes to the SDH frame maker of described cross board.
The course of work of described SDH frame maker is specially: network management system issues to cross board and is used to make SDH frame maker to produce N (N=1,4,16,64) test instruction of level synchronous transfer mode (STM-N) test frame signal, after the channel controller of described test instruction by cross board is transmitted to SDH frame maker, SDH frame maker will generate the test frame of STM-1, STM-4, STM-16 or STM-64 according to the requirement of described instruction, and import pseudo random sequence (PRBS) sign indicating number that self produced in the information payload district of corresponding test frame.SDH frame maker is input to the PRBS sign indicating number in the information payload of the standard virtual container VC-4 of STM-N or VC-4-Xc and sends.Described STM-N is that SDH signal standards speed grade: STM-1 is 155.520Mbps, and STM-4 is 622.080Mbps, and STM-16 is that 2488.320Mbps, STM-64 are 9553.280Mbps.
Here, described PRBS sign indicating number is produced by linear feedback shift register (LFSR) by SDH frame maker, and the length of its PRBS sign indicating number is 2
23-1.
Step 302: tabula rasa receives the test frame signal that the SDH frame transmitter of cross board sends over, by service loop with the SDH frame grabber of described test frame signal forwarding to cross board.
Here, described service loop can be the signal of telecommunication Loopback Mode of tabula rasa inside chip, also can be the light signal Loopback Mode of the optical port of tabula rasa by the optical patchcord connection.
Described SDH frame grabber carries out functions such as data clock recovery, frame synchronization location, frame alignment to the SDH test frame, so that be provided for further detecting and analyzing the test frame signal of error performance for SDH frame watch-dog.
Step 303:SDH frame watch-dog is analyzed the test frame signal that the SDH frame grabber is brought, and gives network management system with the test result of gained by controller report.
Here, be preset with in the described SDH frame watch-dog with SDH frame maker in identical LFSR, being used to produce code length is 2
23-1 PRBS sign indicating number is so that SDH frame watch-dog compares the PRBS sign indicating number in the test frame signal that is received.
Described SDH frame watch-dog is analyzed the SDH test frame of bringing by the SDH frame grabber, be specially: SDH frame watch-dog is monitored the VC-4 of SDH test frame STM-N or the PRBS sign indicating number in the VC-4-Xc information payload district, promptly the PRBS sign indicating number of being imported is carried out synchronous detecting, if it is asynchronous, just provide the alarm indication of PLOS, as test result, and the detection of end process; If synchronously, then start LFSR and produce the PRBS sign indicating number, utilize PRBS sign indicating number that SDH frame watch-dog produced and original PRBS sign indicating number step-by-step in the SDH test frame that is received to compare then, and the number of the PRBS sign indicating number that makes a mistake of statistics is relevant warning information such as TSE, as test result.
In the present embodiment, select the information payload district of PRBS sign indicating number input SDH test frame in the SDH frame maker for use, and in SDH frame watch-dog, receive and the transmission performance analysis of focalization plate is a kind of preferred version.Can also select for use other sign indicating number type to test in actual the use, if this sign indicating number satisfy send to receiving terminal from transmitting terminal after, receiving terminal can step-by-step compare also can add up make a mistake yard number get final product.
Here, described test result comprises LOS, OOF, AIS, B1 byte error code, warning information such as PLOS, TSE.
Like this, just can judge by network management system shown test result and fault location information whether every index of the current tabula rasa of testing satisfies the needs of communications.
Because each piece cross board all comprises the multi-channel test passage, have a plurality of optical ports on the tabula rasa, that is to say that a cross board can connect a plurality of tabula rasas simultaneously, therefore, use bare board test scheme of the present invention concurrently focalization plate test, this has improved the testing efficiency of focalization plate greatly.The test channel of described cross board can be without cross-coupled direct-connected transmission channel, also can be through the interconnection transmission channel after the configuration, if utilize the cross connect function of cross board then can realize in test that the optical port handoff functionality makes test process become more flexible.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (11)
1, a kind of device of bare board test, this device comprise tabula rasa, cross board and network management system three parts; Described cross board further comprises SDH (Synchronous Digital Hierarchy) SDH frame transmitter, SDH frame grabber and channel controller, it is characterized in that, also comprises SDH frame maker, SDH frame watch-dog on the described cross board; Wherein,
Tabula rasa is used to receive the SDH test frame signal that the SDH frame transmitter of cross board is sent, and with described SDH test frame signal again loopback give the SDH frame grabber of cross board;
Cross board is used to send multichannel SDH test frame signal and receives and analyze SDH test frame signal, then test result is reported network management system;
Network management system is used to control cross board and tabula rasa and carries out test job, and outputs test result and the analysis report of corresponding test result;
SDH frame maker is used for being used for testing the SDH test frame signal of error code according to the instruction generation that network management system is sent out by channel controller, and is sent to SDH frame transmitter;
SDH frame transmitter is used for giving tabula rasa to be measured with the test frame signal forwarding from SDH frame maker;
The SDH frame grabber is used to receive the SDH test frame signal by tabula rasa institute loopback, and the data clock of finishing described frame signal recovers, frame synchronization is located and the function of frame alignment, and described frame signal is transmitted to SDH frame watch-dog;
SDH frame watch-dog is used to receive the SDH test frame signal that the SDH frame grabber sent described test frame signal is carried out frame alarm detection and bit error analyzing, and sends test result to channel controller;
Channel controller, the one or more test channel of described cross board and the generation of corresponding SDH test frame signal are controlled in the order that is used to receive network management system, simultaneously, also be used for according to the test result and the analytical test result of the SDH frame watch-dog of the instruction of network management system inquiry test channel and report network management system.
2, a kind of method of bare board test is characterized in that, this method comprises:
A, network management system issue test instruction to cross board, and cross board produces SDH test frame signal and is sent to tabula rasa according to the instruction of being received;
B, tabula rasa receive the test frame signal that cross board sends, by service loop with described test frame signal forwarding to cross board;
C, cross board are analyzed described SDH test frame signal, and resulting test result are reported network management system.
3, method according to claim 2 is characterized in that, the described network management system of step a issues test instruction to cross board, is to finish by the channel controller of cross board.
4, method according to claim 2 is characterized in that, the described cross board of step a produces SDH test frame signal and is sent to tabula rasa, is meant after SDH frame maker produces SDH test frame signal described signal is forwarded to tabula rasa to be measured through SDH frame transmitter.
5, method according to claim 4 is characterized in that, described test frame signal is a kind of in the SDH synchronous transfer mode STM-N frame signal, wherein: N=1,4,16,64.
6, method according to claim 5 is characterized in that, carries the pseudo random sequence PRBS sign indicating number that SDH frame maker is produced in the information payload district of described test frame signal.
7, method according to claim 2, it is characterized in that, the described tabula rasa of step b by service loop with described test frame signal forwarding to cross board, be SDH test frame signal by receiving by the SDH frame grabber of cross board behind the tabula rasa, and the data clock of finishing described frame signal recover, be sent to SDH frame watch-dog again after the function of frame synchronization location and frame alignment.
8, method according to claim 2 is characterized in that, the described cross board of step c is analyzed described SDH test frame signal, is that the SDH frame watch-dog of cross board is analyzed described SDH test frame signal.
9, method according to claim 8, it is characterized in that, the process that described SDH frame watch-dog is analyzed SDH test frame signal is: SDH frame watch-dog carries out synchronous detecting to the PRBS sign indicating number in the described test frame information payload district, if it is asynchronous, then provide the alarm indication of pseudo random sequence synchronization loss PLOS, as test result, and the detection of end process; If synchronously, then utilize the original PRBS sign indicating number step-by-step in SDH frame watch-dog self PRBS sign indicating number that produces and the SDH test frame that is received to compare, and add up the warning information that comprises information payload error code TSE, as test result.
10, method according to claim 2 is characterized in that, step c is described to report network management system with resulting test result, is that the test result that will obtain by SDH frame watch-dog is transmitted to network management system through channel controller.
11, method according to claim 2, it is characterized in that, described SDH frame maker produces the different STM-N test frame signal of standard speed grade, finally transfers to SDH frame watch-dog through tabula rasa, and by described frame watch-dog described test frame signal is analyzed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810084953A CN101534163B (en) | 2008-03-10 | 2008-03-10 | Method for testing optical plate and device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810084953A CN101534163B (en) | 2008-03-10 | 2008-03-10 | Method for testing optical plate and device thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101534163A true CN101534163A (en) | 2009-09-16 |
| CN101534163B CN101534163B (en) | 2012-09-05 |
Family
ID=41104576
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810084953A Expired - Fee Related CN101534163B (en) | 2008-03-10 | 2008-03-10 | Method for testing optical plate and device thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101534163B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101895362A (en) * | 2010-07-27 | 2010-11-24 | 中兴通讯股份有限公司 | Service loopback method and device for synchronizing digital system |
| CN102611499A (en) * | 2012-04-05 | 2012-07-25 | 烽火通信科技股份有限公司 | Method for realizing ODUK (Optical Channel Data Unit) protection switching by crossed disc of OTN (Optical Transport Network) equipment |
| CN102647228A (en) * | 2012-03-31 | 2012-08-22 | 瑞斯康达科技发展股份有限公司 | Method, device and system for detecting SDH (Synchronous Digital Hierarchy) card |
| CN105634644A (en) * | 2015-12-25 | 2016-06-01 | 潘岭 | SDH transmission detection method and system |
| WO2016127871A1 (en) * | 2015-02-12 | 2016-08-18 | 中兴通讯股份有限公司 | Detection device and system and board |
| CN108418628A (en) * | 2017-02-10 | 2018-08-17 | 英特尔公司 | Programmable photon electronic integrated circuit for optic test |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100426760C (en) * | 2005-03-24 | 2008-10-15 | 中兴通讯股份有限公司 | Method for realizing bare board test using false module and its device |
| CN101110641A (en) * | 2007-08-08 | 2008-01-23 | 中兴通讯股份有限公司 | Loopback optical receiving-transmitting module and its testing device and method |
-
2008
- 2008-03-10 CN CN200810084953A patent/CN101534163B/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101895362A (en) * | 2010-07-27 | 2010-11-24 | 中兴通讯股份有限公司 | Service loopback method and device for synchronizing digital system |
| WO2012012997A1 (en) * | 2010-07-27 | 2012-02-02 | 中兴通讯股份有限公司 | Service looping method and device for synchronous digital system |
| CN102647228A (en) * | 2012-03-31 | 2012-08-22 | 瑞斯康达科技发展股份有限公司 | Method, device and system for detecting SDH (Synchronous Digital Hierarchy) card |
| CN102647228B (en) * | 2012-03-31 | 2014-08-06 | 瑞斯康达科技发展股份有限公司 | Method, device and system for detecting SDH (Synchronous Digital Hierarchy) card |
| CN102611499A (en) * | 2012-04-05 | 2012-07-25 | 烽火通信科技股份有限公司 | Method for realizing ODUK (Optical Channel Data Unit) protection switching by crossed disc of OTN (Optical Transport Network) equipment |
| WO2016127871A1 (en) * | 2015-02-12 | 2016-08-18 | 中兴通讯股份有限公司 | Detection device and system and board |
| CN105988073A (en) * | 2015-02-12 | 2016-10-05 | 中兴通讯股份有限公司 | Detection device, detection system and single board |
| CN105634644A (en) * | 2015-12-25 | 2016-06-01 | 潘岭 | SDH transmission detection method and system |
| CN105634644B (en) * | 2015-12-25 | 2017-12-29 | 潘岭 | A kind of detection method and system of SDH transmission |
| CN108418628A (en) * | 2017-02-10 | 2018-08-17 | 英特尔公司 | Programmable photon electronic integrated circuit for optic test |
| CN108418628B (en) * | 2017-02-10 | 2022-11-08 | 英特尔公司 | Programmable photonic electronic integrated circuit for optical testing |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101534163B (en) | 2012-09-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101534163B (en) | Method for testing optical plate and device thereof | |
| US7564798B2 (en) | Methods and devices for testing and monitoring high speed communication networks | |
| KR100893783B1 (en) | A method for analyzing mutual relation of alarms in a synchronous optical transmission network | |
| CN101252393A (en) | Optic cable automatic monitoring system with optical fiber automatic switch unit | |
| CN103312411A (en) | Method and device for detecting fault of optical fiber link | |
| US20090022058A1 (en) | Method and System for Detecting and Reporting Faults of Data Transmission Equipment | |
| CN105187275A (en) | Method and device for measuring optical fiber transmission link asymmetric time delay | |
| CN104184518B (en) | Monitoring device and method for optical wavelength division multiplexing transmission system | |
| US6256326B1 (en) | Pseudo-synchronization prevention method in SDH transmission mode, pseudo-synchronization preventing SDH transmission system, and transmitter-receiver in pseudo-synchronization preventing SDH transmission system | |
| CN101282586A (en) | Method, system and apparatus for detecting optical fiber fault in passive optical network | |
| CN108270482B (en) | Port test method and system | |
| CN101217416B (en) | A network synthesis integrated debugging and testing system | |
| CN103997372B (en) | The method for monitoring state and device of a kind of optical line terminal optical module | |
| CN102664765B (en) | Pseudo-random sequence self transceiving test system in PTN simulation service and method thereof | |
| US7522835B1 (en) | Method of testing bit error rates for a wavelength division multiplexed optical communication system | |
| CN101499853B (en) | Optical path measuring method, optical network and network appliance | |
| CN201118594Y (en) | An optical network terminal and optical line terminal | |
| CN201025711Y (en) | A wave division transmission system for optical cable failure self check | |
| CN109194391B (en) | Error code detection system and detection method thereof | |
| CN104468255B (en) | Air conduct measurement and the redundant data interactive system of management information transmission | |
| CN110412496A (en) | The test function quick self-checking circuit and method of integrated circuit multi parameter tester | |
| CN101908923B (en) | Overall self-detecting system and method | |
| CN102546303B (en) | System and method for testing clock capability of SDH (synchronous digital hierarchy) device | |
| CN102201851B (en) | Remote clock system, equipment and information transmission method | |
| CN101997738B (en) | Test method and system of multiple paths of E1 ports for realizing STM-1 interface |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120905 Termination date: 20180310 |