CN200941616Y

CN200941616Y - SDH transmission optical cable fault detecting system

Info

Publication number: CN200941616Y
Application number: CNU2006200972061U
Authority: CN
Inventors: 黄中海
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-06-12
Filing date: 2006-06-12
Publication date: 2007-08-29
Anticipated expiration: 2016-06-12

Abstract

The utility model is a SDH transmission optical cable fault detection system, which is used to give alarm and report the circuitry fault of SDH transmission equipment; the utility model comprises a transmission terminal functional module TTF, a synchronous equipment management functional module SEMF, a message communication functional module MCF and a transmission network management system. The SPI of the TTF is connected with the optical cable trunk, and is also connected with MCF through the SEMF; the MCF is connected with the transmission network management system. The utility model is characterized in that a optical splitter or a circulator is connected between the optical cable trunk and the SPI, the other end of the optical splitter or the circulator is connected with a photo-detector, the other end of the photo-detector is connected with the SEMF, and the SEMF is connected with transmission network management system through MCF. The utility model adopt the laser device on the transmission equipment as emitting light source, the fault positioning is fast, the circuitry operation state can be scouted in real time, the OTDR purchase cost of the circuitry maintenance unit can be saved, the number of circuitry patrol inspection personnel can be reduced, and the circuitry fault handling time is shortened.

Description

SDH transmission cable fault detection system

Technical field

The present invention relates to the optical communication technique field, particularly SDH transmission equipment is to fault detect.

Background technology

Existing SDH device systems schematic diagram as described in Figure 1, it comprises Transport terminal function module TTF, synchronous equipment management function module SEMF, Message Communication Function module MCF, transmission network management and synchronizer clock source SETS etc.SPI is a SDH equipment physical interface, realizes opto-electronic conversion, Clock Extraction and receives the light alarm function, crosses when low receiving luminous power, and warning information is delivered to SEMF, and SEMF sends to transmission network management output with warning information by MCF.

Wherein TTF is again by SDH Physical Interface module SPI; Regenerator section termination module RST; Multiplex section termination module MST; multiplex section protection module MSP and multiplex section adaptation module MSA form successively; also the direction that flows to of group signals on this composition principle of temporal sequence; group signals arrives first the SPI functional block; through light/electricity conversion; the RST functional block was arrived in circuit extraction regularly afterwards; arrived the MST functional block through RSOH RSOH afterwards to termination; termination through MSOH module MSOH arrived the MSP functional block afterwards; MSP finishes switch function; if triggerless condition; then to the MSA functional block, MSA is used for handling Administrative Unit Pointer AU-PTR to signal flow through the MSP transparent transmission.Realize thus functions such as the detection of signal of telecommunication regenerator section, multiplex section detection, the detection of multiplex section protection byte, signal descramblings.

Interruption has taken place the optical cable of existing optical transmission system between can only positioning equipment and loss increases, can only be when line failure by roughly failure judgement paragraph and the announcement trunk attendant processing of the relevance of different optical transmission systems on resource occupation, after line attendant must be checked means and check the transmission line completion information with OTDR or other line fault, further fault location point and processing again, actual effect is poor; Routine test is the routine work of line attendant to lightguide cable link simultaneously, but test owing to need disconnect transmission equipment in test with optical cable fibre core resource, system safety there is certain influence, so generally in order to check optical cable fibre core quality, adopt the mode of the standby fibre core of test, test is interrupted, and the cycle is long, can not real time reaction optical cable fibre core be subjected to the stability of ectocine.In Fig. 1, as want photometry cable fault, then will detect it with OTDR equipment at SPI light mouth place.Among Fig. 1, when transmission system line interruption or loss increase, the SPI sensed light signal lose or signal power low excessively, SPI produces the R-LOS loss of signal alarm, and inform SEMF management by synchronization module, SEMF reports attendant by MCF (message function module) Q interface or F interface with warning information with alarm signal, the attendant judges that according to warning information line fault produces, but can only judge the circuit switching paragraph, reinform line attendant in the machine room test position fix, arrange personnel that fault paragraph scene is checked simultaneously.

Summary of the invention

The present invention to solve to technical problem be utilize the system itself be based upon on the transmission equipment with light source as the condition of judging the lightguide cable link fault point, realize that the lightguide cable link fault quick and precisely locatees, no longer rely on OTDR equipment judgement lightguide cable link fault.For this reason; the present invention proposes a kind of SDH transmission cable fault detection system; comprise Transport terminal function module TTF; synchronous equipment management function module SEMF; Message Communication Function module MCF and transmission network management; wherein said Transport terminal function module TTF comprises SDH Physical Interface module SPI; Regenerator section termination module RST; Multiplex section termination module MST; multiplex section protection module MSP; multiplex section adaptation module MSA; the SPI of described TTF is connected with fiber cable run; and be connected with described MCF by described SEMF simultaneously; MCF is connected with described transmission network management again, it is characterized in that:

Also be connected with optical branching device or circulator between fiber cable run and described SPI, optical branching device or circulator have a signal port to be connected on the photodetector, and another signal port of photodetector is connected with described SEMF again.SEMF is connected with transmission network management by MCF again; SPI output detects light, detecting light reflects the back at the circuit breakpoint and will detect ripple by optical branching device or circulator and send into photodetector and detect, testing result is transported to SEMF, and SEMF analyzes the back to testing result and by MCF information passed to the transmission network management processing.

SDH transmission cable fault detection system of the present invention, the light source that utilizes the transmission signals of optical transmission system own to use, by adding optical branching device at the light source output, collect echo-signal on the transmission line, send into signal detection system, signal detection system is according to echo change conditions record optical cable fibre core characterisitic parameter change conditions, take place under interruption or the obviously increase situation of loss at lightguide cable link, the optical transmission system circuit interrupts, light is lost, optical channel error codes etc. start optical transmission device optical link fault, the optical fiber parameter that changes and preset according to the optical transmission device webmaster by the detection of echoes loss, the control optical transmission device sends the light pulse model pulsewidth that defines, optical wavelength, luminous power, but light signal is exported the fault judgement result in test value optical property parameter in the retrieval webmaster that breakpoint reflects with regard to the failure judgement point.Compared to existing technology, since make full use of SPI as detection light source and increased optical branching device or circulator and photodetector after had plurality of advantages: 1, the light source that utilizes optical transmission device system itself to be possessed is made the fault detect light source; 2, by webmaster control light source output optical signal pulses width, optical wavelength, luminous power to transmission system self; 3, fault output result is that line interruption takes place at XX kilometer place or loss increases, and directly the announcement trunk attendant rushes to repair and needn't test at machine room; 4, line attendant fault location no longer by searching circuit data and contrastive test result; 5, can write down optical fiber characterisitic parameter change conditions, dynamically output the whole network is being used the optical cable overall condition in real time.

Description of drawings

Fig. 1 is a prior art SDH equipment structure chart.

Fig. 2 is a structure chart of the present invention.

Fig. 3 is an Application Example 1 of the present invention.

Fig. 4 is an Application Example 2 of the present invention.

Fig. 5 is an Application Example 3 of the present invention.

Embodiment

Referring to Fig. 2, SDH transmission cable fault detection system of the present invention is serially connected with optical branching device between the light mouth of the submodule SPI of Transport terminal function module TTF and the fiber cable run, and optical branching device also can substitute for circulator.Optical branching device one signal port connects photodetector, and another signal port of photodetector is connected with synchronous equipment management function module SEMF again, and SEMF is connected with transmission network management by Message Communication Function module MCF again.TTF also has the route that flows to of complete group signals that Regenerator section termination module RST, Multiplex section termination module MST, multiplex section protection module MSP, multiplex section adaptation module MSA form except comprising the SPI submodule.SPI, RST, MST, MSP, the equal ports having of MSA are connected with SEMF, and for SPI, ports having simultaneously is connected with synchronizer clock source SETS, and SETS is connected with synchronous equipment timing physical interface SETPI again.

The present invention adds optical branching device or annular device etc. on original SPI light mouth, its role is to that light transmission mouth is gone up reverberation and send to photodetector, photodetector receives that light ratio is less under the normal condition, when SEMF receives that an other end is received the light alarm, SEMF produces the one-period square wave or starts a square wave generation functional block by SEMF, control SPI output detects ripple, detect wave frequency, power is subjected to the control of square-wave generator, the detection ripple will detect ripple by optical branching device or circulator and send photodetector to detect after the circuit breakpoint reflects, testing result is transported to SEMF, SEMF analyzes the distance of back between transmission network management report optical cable breakpoint and SPI mouth to testing result, and the response physical location is arrived distance map in transmission network management again.

The light that optical branching device or optical circulator mainly send SPI among Fig. 2 outputs on the circuit, reverberation in addition flatly to photodetector, can be adjusted the luminous power that optical branching device or annular device distribute in addition flatly by splitter or circulator according to the detector detection sensitivity on the circuit.This functional module major function is to separate reverberation to detector, if it is that SPI is integrated with the reception reverberation of optical branching device and reverberation is sent to detector to function that SPI light mouth can be realized light mouth of transmit-receive sharing, optical branching device or optical circulator can omit, requirement is little to the insertion loss of SPI incident light, according to the adjustable lay the grain splitter of detector sensitivity or optical circulator in photodetector inlet luminous power allocation proportion.

The SEMF module stores the optical cable characterisitic parameter that is write by transmission network management, as information such as cable length, refractive indexes, according to these information SEMF module or by the square-wave generator of SEMF module controls can adjustable output pulse amplitude, width, the different signal of telecommunication of pulse spacing, it is luminous that the signal of telecommunication drives SPI thus.

It is corresponding with SPI transmission wavelength that photodetector detects wavelength, and it outputs to the SEMF module with testing result sampling, quantification, average with the result, and SEMF will receive testing result and be transported to webmaster.There is the circuit physical message in the webmaster: as information such as XX bar-XX bar line length, XX hole-XX hole line length, fiber cable joint positions.

Light-repeating ship is compared many CDs with optical terminal station, all the other similar can be with reference to improvement.

Application Example of the present invention is as follows, can well contrast useful progressive effect of the present invention by following the application for example.

Fig. 3 is the preferable case study on implementation 1 of Cable's Fault detection system light of the present invention, wherein 1,2,3,4, and 5 all represent the optical relay unit.

In Fig. 3, if circuit breaks down between

transmission node

1 and 2,1 and 2 is all more remote, under the situation of original technology, line attendant will advance the machine room failure judgement and need OTDR, the completion information that needs circuit between

beam worker

1 and 2 needs the arrangement personnel at machine room the circuit disposition to be monitored, and also needs result is reported the transmission network management checked result.Under technology of the present invention, line attendant is directly finished maintenance work under webmaster cooperates now, the transmission network management attendant just can fault location by start the fault judgement program in transmission network management, and 1 and 2 transmission node machine rooms no longer need instrument and personnel.

Fig. 4 is the preferable case study on implementation 2 of Cable's Fault detection system light of the present invention:

In the transmission main line system, because transmission trunking node transmission room and actual area boundary are not together, as interruption of optical cables between first ground among the figure and the second ground, under original technology, transmission network management has problem between only judging first and second, for reducing the breakdown repair time, often notify the first and second two places attendants simultaneously, the first and second two places line attendants need machine room test the disturbance in judgement specified place again by the zone of responsibility in attendant's scene rush to repair, actual process needs webmaster attendant, first and second liang to locate the operator and line attendant is participated in many ways, coordinates very loaded down with trivial details.Under the technology of the present invention, transmission network management can be judged the actual place of line interruption, directly notifies first ground or second ground attendant by the zone of responsibility, and is all very fast aspect repairing time and cooperation.

Fig. 5 is the preferable case study on implementation 3 of Cable's Fault detection system light of the present invention:

Lightguide cable link changes quality with external environment and can progressively descend, for reducing the interruption of optical cables number of times, under original technical situation, line attendant needs constantly to make an inspection tour on foot circuit, all test once all extension wires half a year, but because data from the sample survey is few, be difficult to circuit is performed an analysis and early warning.Under the technology of the present invention, transmission network management can start test at any time, to all with fine periodically test and record, but to circuit progressively deterioration announcement trunk attendant on-the-spot in time handle and certain paragraph optical cable carried out change, accomplish real-time control to the line quality gradual change.

Claims

1, SDH transmission cable fault detection system, comprise Transport terminal function module TTF, synchronous equipment management function module SEMF, Message Communication Function module MCF and transmission network management, wherein said Transport terminal function module TTF comprises SPI, RST, MST, MSP, MSA, the SPI of described TTF is connected with fiber cable run, and be connected with described MCF by described SEMF simultaneously, MCF is connected with described transmission network management again, it is characterized in that:

Also be connected with optical branching device or circulator between fiber cable run and described SPI, optical branching device or circulator have a signal port to be connected on the photodetector, and another signal port of photodetector is connected with described SEMF again; SEMF is connected with transmission network management by MCF again; SPI output detects light, detecting light reflects the back at the circuit breakpoint and will detect ripple by optical branching device or circulator and send into photodetector and detect, testing result is transported to SEMF, and SEMF analyzes the back to testing result and by MCF information passed to the transmission network management processing.