CN101534163B - Method for testing optical plate and device thereof - Google Patents
Method for testing optical plate and device thereof Download PDFInfo
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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 invention relates to a test technology of optical transmission equipment in the field of communication, in particular to a method and a device for testing an optical plate.
Background
In an SDH (synchronous digital hierarchy) optical transmission system, it is often necessary to test optical boards on production and engineering construction sites to determine whether optical board products can meet the requirements of optical transmission technical indexes. The optical plate is a short for optical interface plate.
Fig. 1 is a schematic diagram of a connection mode between an SDH tester and each optical board in an existing optical board testing apparatus, as shown in fig. 1, a tested optical board is connected to the SDH tester through an optical fiber, a light receiving port of the tested optical board is connected to a light emitting port of the SDH tester, the light emitting port of the tested optical board is connected to a light receiving port of the SDH tester, a service returns to the tested optical board through a cross board, and indexes such as an error code optical board can be tested by the SDH tester, so as to determine whether an optical board product can meet requirements of optical transmission technical indexes. If a plurality of optical boards and a plurality of optical ports need to be tested, the optical ports of the optical boards are connected with the SDH tester manually or by adding an optical port switching device, and then the test can be carried out. However, under the condition of simplifying error code testing, the traditional testing method needs expensive testing instruments and time-consuming manual operation, so that the degree of automation is low and the testing efficiency is low.
The patent application with the application number of CN200510056484.2 and the name of 'method and device for realizing light plate test by using dummy module' discloses a scheme for realizing the test of a high-speed light plate by multiplexing a low-speed light plate to a high-speed light plate by adopting an SDH tester, and the method comprises the following steps: the SDH tester sends the service to a normal light plate with an optical module through an optical fiber; configuring a cross board of SDH, and crossing the service converted by a normal optical board to a tested optical board with a false optical module; the false optical module on the tested optical board loops back the service, transmits the service to the normal optical board through the cross board, and transmits the service back to the SDH tester through the optical fiber after the service is converted by the normal optical board, so that the SDH tester tests the tested optical board. The method realizes the rate multiplexing from a low-rate optical plate to a high-rate optical plate by utilizing the connection of dummy modules and the multiplexing function of a cross plate, and adopts an SDH tester to realize the test of the high-rate optical plate. However, the method still has the defects of complex operation process and low testing efficiency when a large number of light panels are tested.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a method for testing optical panels, which can test a plurality of optical panels and a plurality of optical ports in parallel, thereby improving the testing efficiency and reducing the testing cost.
Another object of the present invention is to provide an optical board testing apparatus, which can test a plurality of optical boards and a plurality of optical ports in parallel, thereby improving testing efficiency and reducing testing cost.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a device for testing a light plate comprises a light plate, a cross plate and a network management system; the cross board further comprises a Synchronous Digital Hierarchy (SDH) frame transmitter, an SDH frame receiver and a channel controller, and the cross board further comprises an SDH frame generator and an SDH frame monitor; wherein,
the optical plate is used for receiving the SDH test frame signal sent by the SDH frame transmitter of the cross plate and returning the SDH test frame signal to the SDH frame receiver of the cross plate;
the cross board is used for sending a plurality of paths of SDH test frame signals, receiving and analyzing the SDH test frame signals and reporting a test result to the network management system;
the network management system is used for controlling the cross board and the light board to carry out test work and outputting a test result and an analysis report of the corresponding test result;
an SDH frame generator for generating an SDH test frame signal for testing error codes according to an instruction sent by a network management system through a channel controller and transmitting the SDH test frame signal to an SDH frame transmitter;
the SDH frame transmitter is used for forwarding the test frame signal from the SDH frame generator to the optical plate to be tested;
the SDH frame receiver is used for receiving an SDH test frame signal looped back by the optical plate, completing the functions of data clock recovery, frame synchronization positioning and frame alignment of the frame signal, and forwarding the frame signal to the SDH frame monitor;
the SDH frame monitor is used for receiving an SDH test frame signal sent by the SDH frame receiver, carrying out frame alarm detection and error code analysis on the test frame signal and transmitting a test result to the channel controller;
and the channel controller is used for receiving a command of the network management system to control one or more test channels of the cross board and the generation of corresponding SDH test frame signals, and meanwhile, is also used for inquiring the test result and the analysis test result of the SDH frame monitor of the test channel according to the command of the network management system and reporting the test result to the network management system.
A method of light panel testing, the method comprising:
a. the network management system sends a test instruction to the cross board, and the cross board generates an SDH test frame signal according to the received instruction and sends the SDH test frame signal to the optical board;
b. the optical board receives a test frame signal sent by the cross board, and forwards the test frame signal to the cross board through service loopback;
c. and analyzing the SDH test frame signal by the cross board, and reporting the obtained test result to a network management system.
And c, the network management system in the step a sends a test instruction to the cross board, and the test instruction is completed through a channel controller of the cross board.
The step a, the cross board generates an SDH test frame signal and sends the SDH test frame signal to the optical board, namely, the SDH frame generator of the cross board generates the SDH test frame signal and then forwards the signal to the optical board to be tested through the SDH frame transmitter of the cross board.
The test frame signal is one of synchronous transmission module STM-N frame signals of SDH, wherein: n is 1, 4, 16, 64.
The information payload area of the test frame signal carries the pseudo random sequence PRBS code generated by the SDH frame generator.
And b, the optical board transmits the test frame signal to the cross board through service loopback, the SDH test frame signal passes through the optical board and is received by an SDH frame receiver of the cross board, and the SDH test frame signal is transmitted to an SDH frame monitor of the cross board after the functions of data clock recovery, frame synchronization positioning and frame alignment of the frame signal are completed.
C, the cross board analyzes the SDH test frame signal, and the SDH test frame signal is analyzed by the SDH frame monitor of the cross board.
The process of the SDH frame monitor analyzing the SDH test frame signal is as follows: the SDH frame monitor synchronously detects the PRBS code in the test frame information payload area, if the PRBS code is not synchronous, an alarm indication that the PLOS is synchronously lost in the pseudo-random sequence is given out as a test result, and the detection process is ended; if synchronous, using PRBS code generated by SDH frame monitor itself to compare with original PRBS code in SDH test frame according to bit, and counting alarm information including information net load error code TSE as test result.
And c, reporting the obtained test result to the network management system, namely forwarding the test result obtained by the SDH frame monitor of the cross board to the network management system through a channel controller of the cross board.
And the SDH frame generator of the cross board generates STM-N test frame signals with different standard rate grades, the STM-N test frame signals are finally transmitted to the SDH frame monitor of the cross board through the optical board, and the test frame signals are analyzed by the frame monitor.
The method and the device for realizing the light plate test have the following advantages that:
the invention adds SDH frame generator in the cross board to make the cross board have the function of generating SDH test frame, adds SDH frame monitor to make the cross board have the function of analyzing and monitoring test frame, combines channel controller and network management system to test the signal received and sent by the optical board, and can obtain the test result of the tested optical board.
Drawings
Fig. 1 is a schematic view of a connection mode between an SDH tester and each optical board in a conventional optical board testing apparatus;
FIG. 2 is a schematic diagram of a system configuration of a light panel testing apparatus according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a testing process of the light panel test according to an embodiment of the present invention.
Detailed Description
The method of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments of the invention.
Fig. 2 is a schematic structural diagram of a system of an optical board testing apparatus according to an embodiment of the present invention, and as shown in fig. 2, the apparatus includes an optical board 200, a cross board 201, and a network management system 202. One cross board 201 includes a channel controller 2015 and a plurality of test channels, i.e., test channels 1-n; each test channel comprises an SDH frame generator 2011, an SDH frame transmitter 2012, an SDH frame receiver 2013, and an SDH frame monitor 2014; each test channel may receive a light panel 200 to be tested. In practice, there may be multiple optical ports on one optical plate, and thus, one optical plate may also be connected to multiple test channels. Wherein,
the optical board 200 is configured to receive an SDH test frame signal sent by the SDH frame transmitter 2012 of the cross board 201, and loopback the SDH test frame signal to the SDH frame receiver 2013 of the cross board 201.
The cross board 201 is configured to send multiple channels of SDH test frame signals, receive and analyze the SDH test frame signals, and then report a test result to the network management system 202.
And the network management system 202 is used for controlling the cross board 201 and the optical board 200 to perform testing work and outputting a testing result and a corresponding analysis report of the testing result.
An SDH frame generator 2011 is configured to generate an SDH test frame signal for testing an error code according to an instruction sent by the network management system 202 through the channel controller 2015, and transmit the SDH test frame signal to the SDH frame transmitter 2012.
An SDH frame transmitter 2012 for forwarding the frame signal from SDH frame generator 2011 to optical board 200 to be tested.
The SDH frame receiver 2013 is configured to receive an SDH test frame signal looped back through the optical board 200, complete functions of data clock recovery, frame synchronization positioning, frame alignment, B1 byte check, and the like of the frame signal, and forward the frame signal to the SDH frame monitor 2014.
Here, the SDH frame receiver can also give a test result of a test frame signal according to functions such as clock recovery, frame synchronization positioning, frame alignment, and B1 byte check, for example: LOSs of signal (LOS), out of frame alarm (OOF), Alarm Indication Signal (AIS), and B1 byte error.
The frame synchronization positioning is to detect the transmitted data stream and find the positions of the frame headers a1 and a2 so as to analyze the current test frame signal.
The frame alignment is to align the data streams received by the multiple test channels to the position of the synchronous frame header inside the cross board.
The B1 byte check is used for monitoring the error code of the regeneration section.
And an SDH frame monitor 2014, configured to receive the SDH test frame signal sent by the SDH frame receiver 2013, perform frame alarm detection and error code analysis on the test frame signal, and transmit the test result to the channel controller 2015.
Here, the frame alarm detection and error code analysis are performed on the SDH test frame signal, and include detection and analysis items such as alarm detection of pseudo random sequence synchronization loss (PLOS) and the like and information payload error code (TSE) performance analysis and the like.
The channel controller 2015 is configured to receive a command from the network management system 202 to control one or more test channels of the cross board 201 and generation of corresponding SDH test frame signals, and meanwhile, is further configured to query a test result and an analysis test result of the SDH frame monitor 2014 of the test channel according to an instruction of the network management system and report the test result to the network management system 202.
Fig. 3 is a schematic diagram of a testing process of a light panel test according to an embodiment of the present invention, and as shown in fig. 3, the method includes:
step 301: the network management system sends a test instruction to the cross board, and the SDH frame generator of the cross board generates an SDH test frame signal and sends the test frame signal to the optical board through the SDH frame transmitter.
Here, the SDH frame generator of the cross board generates an SDH test frame signal according to a test instruction of the network management system forwarded by the channel controller.
The working process of the SDH frame generator specifically is as follows: the network management system sends a test instruction for enabling an SDH frame generator to generate an N (N is 1, 4, 16, 64) level synchronous transmission module (STM-N) test frame signal to a cross board, after the test instruction is forwarded to the SDH frame generator through a channel controller of the cross board, the SDH frame generator generates a test frame of STM-1, STM-4, STM-16 or STM-64 according to the requirement of the instruction, and inputs a pseudo random sequence (PRBS) code generated by the SDH frame generator in an information payload area of the corresponding test frame. The SDH frame generator inputs the PRBS code into the information payload of a standard virtual container VC-4 or VC-4-Xc of STM-N and sends the PRBS code out. STM-N, SDH, signal standard rate hierarchy: STM-1 is 155.520Mbps, STM-4 is 622.080Mbps, STM-16 is 2488.320Mbps, STM-64 is 9553.280 Mbps.
Here, what isThe PRBS code is generated by SDH frame generator through Linear Feedback Shift Register (LFSR), and the length of PRBS code is 223-1。
Step 302: the optical board receives the test frame signal sent by the SDH frame transmitter of the cross board, and forwards the test frame signal to the SDH frame receiver of the cross board through service loopback.
Here, the service loopback may be an electrical signal loopback mode of an optical board internal chip, or an optical signal loopback mode in which an optical port of an optical board is connected by an optical fiber jumper.
The SDH frame receiver performs functions of data clock recovery, frame synchronization positioning, frame alignment and the like on an SDH test frame so as to provide a test frame signal for further detecting and analyzing error code performance for an SDH frame monitor.
Step 303: the SDH frame monitor analyzes the test frame signal sent by the SDH frame receiver and reports the obtained test result to the network management system through the controller.
Here, the same LFSR as in the SDH frame generator is preset in the SDH frame monitor for generating a code length of 223-1 PRBS code for the SDH frame monitor to compare the PRBS code in the received test frame signal.
The SDH frame monitor analyzes the SDH test frame sent from the SDH frame receiver, and specifically includes: the SDH frame monitor monitors the PRBS code in the VC-4 or VC-4-Xc information payload area of the SDH test frame STM-N, namely, the input PRBS code is synchronously detected, if the PRBS code is not synchronous, the alarm indication of PLOS is given out as a test result, and the detection process is ended; if synchronous, starting LFSR to generate PRBS code, comparing the PRBS code generated by SDH frame monitor with the original PRBS code in SDH test frame bit by bit, and counting the number of error PRBS codes, namely TSE and other related warning information as test result.
In this embodiment, it is a preferable scheme that the SDH frame generator inputs the information payload area of the SDH test frame by using the PRBS code, and receives and analyzes the transmission performance of the optical board in the SDH frame monitor. In actual use, other code patterns can be selected for testing as long as the codes meet the requirement that after the codes are sent from the sending end to the receiving end, the codes can be compared according to bits at the receiving end, and the number of the codes with errors can be counted.
Here, the test result includes LOS, OOF, AIS, B1 byte error code, PLOS, TSE, and other alarm information.
Therefore, whether various indexes of the currently tested optical plate meet the requirement of communication transmission can be judged through the test result and the fault positioning information displayed by the network management system.
Because each cross board contains multiple testing channels, and one light board can have multiple light ports, that is, one cross board can be connected with multiple light boards, the light board testing scheme of the invention can be used for testing the light boards in parallel, thereby greatly improving the testing efficiency of the light boards. The test channel of the cross board can be a direct connection transmission channel without cross connection or a cross connection transmission channel after configuration, and if the cross connection function of the cross board is utilized, the optical port switching function can be realized in the test, so that the test process becomes more flexible.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (11)
1. A device for testing a light plate comprises a light plate, a cross plate and a network management system; the cross board further comprises a Synchronous Digital Hierarchy (SDH) frame transmitter, an SDH frame receiver and a channel controller, and is characterized by also comprising an SDH frame generator and an SDH frame monitor; wherein,
the optical plate is used for receiving the SDH test frame signal sent by the SDH frame transmitter of the cross plate and returning the SDH test frame signal to the SDH frame receiver of the cross plate;
the cross board is used for sending a plurality of paths of SDH test frame signals, receiving and analyzing the SDH test frame signals and reporting a test result to the network management system;
the network management system is used for controlling the cross board and the light board to carry out test work and outputting a test result and an analysis report of the corresponding test result;
an SDH frame generator for generating an SDH test frame signal for testing error codes according to an instruction sent by a network management system through a channel controller and transmitting the SDH test frame signal to an SDH frame transmitter;
the SDH frame transmitter is used for forwarding the test frame signal from the SDH frame generator to the optical plate to be tested;
the SDH frame receiver is used for receiving an SDH test frame signal looped back by the optical plate, completing the functions of data clock recovery, frame synchronization positioning and frame alignment of the frame signal, and forwarding the frame signal to the SDH frame monitor;
the SDH frame monitor is used for receiving an SDH test frame signal sent by the SDH frame receiver, carrying out frame alarm detection and error code analysis on the test frame signal and transmitting a test result to the channel controller;
and the channel controller is used for receiving a command of the network management system to control one or more test channels of the cross board and the generation of corresponding SDH test frame signals, and meanwhile, is also used for inquiring the test result and the analysis test result of the SDH frame monitor of the test channel according to the command of the network management system and reporting the test result to the network management system.
2. A method of testing a light panel, the method comprising:
a. the network management system sends a test instruction to the cross board, and the cross board generates an SDH test frame signal according to the received instruction and sends the SDH test frame signal to the optical board;
b. the optical board receives a test frame signal sent by the cross board, and forwards the test frame signal to the cross board through service loopback;
c. and analyzing the SDH test frame signal by the cross board, and reporting the obtained test result to a network management system.
3. The method according to claim 2, wherein the step a of the network management system issuing the test command to the cross board is performed by a channel controller of the cross board.
4. The method according to claim 2, wherein the cross board of step a generates and transmits SDH test frame signal to the optical board, and the SDH frame generator of the cross board generates and transmits SDH test frame signal to the optical board to be tested via the SDH frame transmitter of the cross board.
5. The method according to claim 4, wherein the test frame signal is one of SDH synchronous transport module STM-N frame signals, wherein: n is 1, 4, 16, 64.
6. The method according to claim 5, wherein the information payload region of the test frame signal carries a pseudo random sequence PRBS code generated by the SDH frame generator.
7. The method according to claim 2, wherein the optical board in step b forwards the test frame signal to the cross board through service loopback, and the test frame signal is SDH test frame signal is received by SDH frame receiver of the cross board after passing through the optical board, and is sent to SDH frame monitor of the cross board after completing the functions of data clock recovery, frame synchronization positioning and frame alignment of the frame signal.
8. The method according to claim 2, wherein said cross board of step c analyzes said SDH test frame signal, and wherein said SDH test frame signal is analyzed by a SDH frame monitor of said cross board.
9. The method of claim 8, wherein the SDH test frame signal analysis by the SDH frame monitor is: the SDH frame monitor synchronously detects the PRBS code in the test frame information payload area, if the PRBS code is not synchronous, an alarm indication that the PLOS is synchronously lost in the pseudo-random sequence is given out as a test result, and the detection process is ended; if synchronous, using PRBS code generated by SDH frame monitor itself to compare with original PRBS code in SDH test frame according to bit, and counting alarm information including information net load error code TSE as test result.
10. The method according to claim 2, wherein the reporting of the obtained test result to the network management system in step c is to forward the test result obtained by the SDH frame monitor of the cross board to the network management system through the channel controller of the cross board.
11. A method according to claim 2, characterized in that the SDH frame generator of the cross-board produces STM-N test frame signals of different standard rate levels, which are finally transmitted via the optical board to the SDH frame monitor of the cross-board, and the test frame signals are analyzed by the frame monitor.
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| 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 |
| 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 |
| CN102611499B (en) * | 2012-04-05 | 2015-01-14 | 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 |
| 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 |
| CN105634644B (en) * | 2015-12-25 | 2017-12-29 | 潘岭 | A kind of detection method and system of SDH transmission |
| US10236975B2 (en) * | 2017-02-10 | 2019-03-19 | Intel Corporation | Programmable photonic-electronic integrated circuit for optical testing |
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| CN1838619A (en) * | 2005-03-24 | 2006-09-27 | 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 |
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| CN1838619A (en) * | 2005-03-24 | 2006-09-27 | 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 |
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