CN201234126Y - Multiplex protection switching device between low-speed optical fiber interface and 2M transmission line - Google Patents
Multiplex protection switching device between low-speed optical fiber interface and 2M transmission line Download PDFInfo
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- CN201234126Y CN201234126Y CNU2008201092890U CN200820109289U CN201234126Y CN 201234126 Y CN201234126 Y CN 201234126Y CN U2008201092890 U CNU2008201092890 U CN U2008201092890U CN 200820109289 U CN200820109289 U CN 200820109289U CN 201234126 Y CN201234126 Y CN 201234126Y
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Abstract
The utility model discloses a multiplex protection switch device between a low-speed optical fiber interface and a 2M transmission line. The multiplex protection switch device comprises photoelectric/electro-optic conversion modules based on low-speed optical fiber interfaces and sequentially electrically connected with each other for conversion between optical signals and low-speed data; a multiplex-demultiplex module for multiplexing/demultiplexing between multi-path low-speed data and 2M signals; and an automatic line switch module for automatically switching and transmitting redundant lines according to transmission quality. The multiplex protection switch device can be used for multiplex-transmitting multi-path low-speed optical signals, and has the advantages of compatibility to new and old equipments, improved equipment use efficiency and reduced cost.
Description
Technical field
The utility model relates to the protective relaying device field, relates in particular to a kind of many low speed optical fiber interfaces in the protective relaying device and multiplexing protection switching device shifter between the 2M transmission line of being applied to.
Background technology
Protective relaying device be electric power system be used for monitoring the ruuning situation of power network in real time and in the power plant, the equipment that the control electric brake is switched when unusual appears in the high-tension line of power distribution station.The communication interface of this equipment mostly is the low speed optical fiber interface, and this is that optical fiber interface has good antijamming capability because protective relaying device is installed in the forceful electric power magnetic environment.Protective relaying device all is paired use, and the two ends protective relaying device is by the interconnection of optical fiber interface, calculates voltage and current parameter on the high-voltage line etc. jointly, whether controls electric brake with decision and switches.At present in actual applications, the connected mode of optical fiber interface has following several.
A kind of connected mode is to use the fiber direct connection mode; the low speed optical fiber interface that is about to two protective relaying devices directly links to each other with an optical fiber; in system of relay protection; this mode is usually used between the small-sized transformer station; have only a pair of protective relaying device to interconnect between two stations, and distance have only several kilometers.Far away for transmission range; the more situation of equipment just has been not suitable for; shortcoming is: need be the special laying optical cable of the low speed data between two protective relaying devices; the cost height; can't make full use of already used common transmission system, as SDH (SDH (Synchronous Digital Hierarchy)), PDH (PDH (Pseudo-synchronous Digital Hierarchy)) network.
Second kind of connected mode adopts multiplexing protective device, and promptly photoelectricity/electric light conversion+PCM (pulse code modulation) divides the mode of multiple connection equipment to link to each other.At communications equipment room away from the electric power machine room; the light signal of optical fiber interface is converted to the low speed data of low speed data interface by multiplexing protective device; the most commonly the light signal of 64Kb/s is converted at present the low speed signal of 64Kb/s; this low speed data is multiplexed in the E1 interface by PCM equipment again, and soon low speed data is inserted into and obtains the 2M signal in the 2M data flow.The 2M signal transmits by PDH, SDH optical transceiver or microwave system then, is transferred to the multiplexing protective device of the other end, and this multiplexing protective device is a low speed data with 2M signal demultiplexing again, and converts light signal to, is transferred to the relay protection device of the other end.The shortcoming of this implementation is that if the data of the transmission line failure of PDH, SDH or transmission are made mistakes, protective relaying device just can't normally use, and has had a strong impact on the fail safe of electric power system.
The third connected mode is considered from security standpoint, has increased a redundant transmission circuit between the multiplexing protective device in two ends, promptly on the basis of above-mentioned multiplexing protective device, divides the mode of multiple connection+circuit automatic switching apparatus to link to each other by photoelectricity/electric light conversion+PCM.Two SDH circuits only need be rented by electric power operator, just can realize the backup of transmission line by redundant SDH circuit easily.During transfer of data, compare the transmission quality of two circuits, good transmission line transmits to automatically switch to transmission quality, improves the reliability of transmission system greatly, has reduced cost.This is the mode that present most of electric power operator takes, and below what mentioned all is the multiplexing protection switching device shifters that adopt this connected mode.
Protective relaying device and power supply circuit are supporting, and a protective relaying device can only provide protection to a power circuit.When certain direction electricity needs is big, need be by many power circuits simultaneously to a direction power supply, at this moment, a protective relaying device is just not enough, and this just needs the power supply of two of two or more protective relaying device protections or many power lines.In the existing technology, multiplexing protection switching device shifter can only transmit the data of a protective relaying device, to the transmission of a plurality of protective relaying device data, need provide corresponding a plurality of multiplexing protection switching device shifters.Obviously, the use cost of prior art is very high.
In the existing multiplexing protection switching device shifter, do not make full use of the PCM multiplex technique.According to national standard and international recommendation, the Frame of pcm encoder has 32 time slots, from time slot 0 to time slot 31.Wherein, time slot 0 is a frame head, is used for frame synchronization; Time slot 31 can be used to transmission network management information; Time slot 1 can use to the user to time slot 30, is used to transmit data.In the prior art, multiplexing protection switching device shifter is converted to low speed data with the light signal of protective relaying device, the most commonly the low speed light signal is converted to the low speed data of 64Kb/s at present, again this low speed data is multiplexed with the 2M signal.Thus, the low speed data of 30 road 64Kb/s can be multiplexed in theory in the Frame of 2M speed and transmit.But, the light signal that multiplexing protection switching device shifter can only the transmission of one line protective relaying device in the practical application, promptly the time slot that takies of the low speed data of transmitting optical signal only is seldom a part in total time slot of the Frame of 2M speed.Like this, the Frame of 2M speed is not fully used, and has caused the waste of bandwidth.
In addition, along with development of fiber technology, the optical fiber interface of the protective relaying device of each producer is varied on the domestic market, and its transmission rate has nothing in common with each other.Multimode fiber is mainly used in early stage domestic market, and is still continuing to use this multimode fiber technology abroad.Present domestic monomode fiber technology that adopt more.Because the newly-built and technological innovation of electric power system project; adopt the optical fiber technology of list/multimode; the protective relaying device of transmission different rates appears in the market simultaneously, and corresponding multiplexing protection switching device shifter is also varied, lacks the multiplexing protection switching device shifter of a compatibility.
The utility model content
In view of this; main purpose of the present utility model is to provide the multiplexing protection switching device shifter between a kind of low speed optical fiber interface and the 2M transmission line, solves to transmit simultaneously in the prior art that time slot uses problem insufficient, waste bandwidth in multichannel protective relaying device light signal and the transmission course.
Further, the utility model can also be realized the compatibility use of multiple protective relaying device.
For achieving the above object, the technical solution of the utility model is achieved in that
Multiplexing protection switching device shifter between a kind of low speed optical fiber interface and the 2M transmission line, this device include the photoelectricity/electrooptic conversion module based on the low speed optical fiber interface, branch multiple connection module, the circuit automatic switchover module that is electrically connected successively.
Photoelectricity/electrooptic conversion module, be used to receive multipath light signal, multipath light signal obtains corresponding multi-path low speed data through opto-electronic conversion, these multi-path low speed data and the 2M clock that is synchronized with the light signal low-speed clock are mail to branch multiple connection module, and will carry out light coding from the multi-path low speed data that minute multiple connection module receives and obtain multipath light signal, and multipath light signal is sent respectively.
Divide the multiple connection module, the multi-path low speed data that are used for photoelectricity/electrooptic conversion module is received are carried out multiplexed, multiplexing one road 2M Frame that becomes, reception order according to low speed data is inserted time tag in the 2M Frame, and insertion cyclic redundancy check code word, under the control of the 2M clock that receives, send the 2M signal of forming by the 2M Frame to circuit automatic switchover module, and automatically switch 2M signal that module receives of circuit carried out demultiplexing and handle, be reduced to corresponding multi-path low speed data, issue photoelectricity/electrooptic conversion module.
Circuit automatic switchover module, being used for being divided into two-way by the 2M signal that minute multiple connection module obtains sends, and with the two-way 2M signal that receives by time tag sorting alignment, and do the transmission quality analysis according to cyclic redundancy check code word, select wherein a road good 2M signal of transmission quality, issue branch multiple connection module.
Wherein, described two E1 interfaces are connected respectively to SDH network or PDH network or the direct transmission line that links to each other etc.Described 2M signal is specially and meets G.703 and the G.704 standard 2M digital signal of suggestion of ITU-T.
Further, described photoelectricity/electrooptic conversion module includes a plurality of optical transceiver modules that optical fiber interface is provided, and is used for receiving optical signals, and realization and the ring of light return the optical signal transceiver between control module; The ring of light that is used for the signal loopback test returns control module; The light encoding and decoding control and the clock selection module that are used to provide synchronised clock and send light encoding and decoding control information to photodissociation sign indicating number Clock Extraction module and light coding module; Be used for according to light encoding and decoding control information, the ring of light is returned the light coding module that light signal that control module receives is decoded into the photodissociation sign indicating number Clock Extraction module of low speed data and is used for low speed data is encoded into light signal; Be used to store low speed data that photodissociation sign indicating number Clock Extraction module sends, and this low speed data mail to the receipts buffer of branch multiple connection module; Be used to receive branch multiple connection module low speed data, and this low speed data is mail to the buffer of sending out of light coding module.
Wherein, described optical transceiver module is pluggable plug connector, and is preferable, can be according to the corresponding optical transceiver module of the type selecting of protective relaying device.Preferable, can the optical transceiver module of respective numbers be installed according to protective relaying device quantity.
Further, described minute multiple connection module the multi-path low speed data that are used to receive photoelectricity/electrooptic conversion module and provide is provided, and this multi-path low speed data multiplex become one road 2M signal, issues the data multiplex module of data loopback control module; Be used to receive the 2M signal that data loopback control module is sent, and this 2M signal is demultiplexed into data demultiplexing module into the multi-path low speed data; Be used to receive the 2M signal that data loopback control module is sent, time tag be inserted into the markers insert module of the 2M signal after multiplexing according to the reception order; Be used to receive the 2M signal of markers insert module after time tag inserts, cyclic redundancy check (CRC) code be inserted into the 2M signal after time tag inserts and send the cyclic redundancy check (CRC) insert module of this 2M signal to circuit automatic switchover module direction; The data loopback control module that is used for optical fiber interface side and E1 interface side loopback test.
Further, described circuit automatic switchover module includes the markers extraction alignment of data module that two 2M signals that are used for that two E1 interfaces are received carry out alignment of data; Two buffers that are used to store through the 2M signal of markers alignment; Two are used for according to cyclic redundancy check code word the 2M signal that receives by two E1 interfaces being carried out the transmission quality analysis module that transmission quality is analyzed; Be used for the 2M signal that two E1 interfaces are received is carried out clock selecting and level and smooth clock switching and level and smooth module; Be used for selecting switchover policy, sending the circuit switching controls module of switching controls order according to the analysis result of transmission quality analysis module; Be used for according to the switching controls command selection of circuit switching controls module and send the data switching module that data are switched between two buffers.
The utility model can carry out multiplexing transmission to the multi-path low speed light signal simultaneously, and this scheme can effectively improve the utilance of 2M transmission circuit, satisfies the transmission of many cover protective relaying device data multiplexing, has reduced construction and operation expense.Adopt the mode that not damaged switches to improve transmission quality simultaneously, guarantee that transmission line is reliable and stable; Need not manual intervention, can carry out route protection automatically and switch.The utility model can guarantee the operate as normal of relay protection device to the full extent, thereby guarantees the safe and reliable of power network.
The utility model adopts photoelectricity/electrooptic conversion module, divides multiple connection module and circuit automatic switchover module is the structure of one, has reduced the quantity of intermediate equipment, has reduced the fault point.Optical transceiver module has wherein adopted the form of plug connector, is used to provide optical fiber interface, can select to install corresponding optical transceiver module according to the type and/or the quantity of protective relaying device.For example, because power expansion or the more advanced protective relaying device of replacing, need to adjust optical fiber interface, only needing to change the optical transceiver module that is fit to gets final product, use when can support the optical fiber interface of single mode or multimode, different transmission rates, need not other parts are changed, can reduce construction cost; And, can increase optical transceiver module as required, use when making things convenient for dilatation.Greatly improve service efficiency of the present utility model, improved maintainability and extensibility.
Description of drawings
Fig. 1 is the connection diagram of two pairs of protective relaying device transmission systems of the utility model;
Fig. 2 is the structural representation of two optical transceiver modules of the utility model grafting;
Fig. 3 is the structural representation of the utility model photoelectricity/electrooptic conversion module;
Fig. 4 divides the structural representation of multiple connection module for the utility model;
Fig. 5 is the structural representation of the utility model circuit automatic switchover module.
Embodiment
Below describe concrete structure of the present utility model and corresponding data communication flow process in detail.
The utility model discloses the multiplexing protection switching device shifter between a kind of low speed optical fiber interface and the 2M transmission line, this apparatus features is the light signal that can transmit the multichannel protective relaying device simultaneously, and described light signal is the light signal of sending by low-speed clock.By light signal decoding multiplexing with the multichannel protective relaying device; and provide the 2M that is synchronized with the light signal low-speed clock clock; obtain one road 2M signal; described 2M signal is the 2M signal by the 2M clock transfer that is synchronized with the light signal low-speed clock, and the 2M signal is specifically as follows and meets G.703 and the G.704 standard 2M digital signal of suggestion of ITU-T.Transmission when realizing multichannel protective relaying device data.Below be example with the data of transmitting two paths protective relaying device, the transmission course of multichannel data is described.
Transmission system as shown in Figure 1; the low speed optical fiber interface is connected protective relaying device A 101 and protective relaying device B 102 simultaneously with multiplexing protection switching device shifter A 103 between the 2M transmission line; receive the two ways of optical signals of protective relaying device A 101 and protective relaying device B 102 respectively by two optical fiber interfaces; this two ways of optical signals conversion is multiplexed with one road 2M signal; and this 2M signal mail to transmission line A 104 and transmission line B 105 by two E1 interfaces, realize the redundant transmission of data.
Two the E1 interfaces of multiplexing protection switching device shifter B 106 between low speed optical fiber interface and the 2M transmission line receive above-mentioned two-way 2M signal respectively; select good wherein one road 2M signal of transmission quality; carry out demultiplexing and be reduced to the two ways of optical signals that correspondence is sent; by two optical fiber interfaces, issue respectively among corresponding the protective relaying device C 107 and protective relaying device D 108.
Described transmission line A 104 and transmission line B 105 can be respectively SDH network or PDH network, also can adopt the transmission line that directly links to each other of independent laying, as transmission lines such as twisted-pair feeder, coaxial cables.
Multiplexing protection switching device shifter between low speed optical fiber interface of the present utility model and the 2M transmission line, as shown in Figure 2, its composition comprises: photoelectricity/electrooptic conversion module 201, branch multiple connection module 202, circuit automatic switchover module 203.
When multiplexing protection switching device shifter is positioned at the signal transmitter side:
Photoelectricity/electrooptic conversion module 201 is used to receive the light signal that two optical fiber interfaces transmit, two ways of optical signals obtains the two-way low speed data through opto-electronic conversion, this two-way low speed data is mail to branch multiple connection module 202, and provide the 2M that is synchronized with the light signal low-speed clock clock for a minute multiple connection module 202.
Divide multiple connection module 202 to be used for carrying out multiplexing to the two-way low speed data that receives, multiplexing one road 2M Frame that becomes of two-way low speed data, reception order according to low speed data is inserted time tag in the 2M Frame, and insertion cyclic redundancy check code word, under the control of the 2M clock that receives, send the 2M signal of forming by the 2M Frame to circuit automatic switchover module 203.
Circuit automatic switchover module 203 is divided into two-way with the 2M signal that obtains to be sent from the E1 interface, realizes redundant transmission.
When multiplexing protection switching device shifter is positioned at the signal receiver side:
The two-way 2M signal that circuit automatic switchover module 203 is used for receiving aligns by the time tag sorting, and does the transmission quality analysis according to cyclic redundancy check code word, selects wherein a road good 2M signal of transmission quality, issues branch multiple connection module 202.
The 2M signal that divides multiple connection module 202 to be used for receiving carries out demultiplexing to be handled, and is reduced to the two-way low speed data identical with 2M signal transmitter side, issues photoelectricity/electrooptic conversion module 201.
Photoelectricity/electrooptic conversion module 201 is used for that the two-way low speed data is carried out the light coding and obtains two ways of optical signals, and two ways of optical signals is sent by two optical fiber interfaces respectively.
Below in conjunction with accompanying drawing, photoelectricity/electrooptic conversion module 201 is described successively, divides the concrete function and the composition of multiple connection module 202, circuit automatic switchover module 203.
Photoelectricity/electrooptic conversion module 201 as shown in Figure 3, comprising:
Optical transceiver module 301 is used to provide optical fiber interface, the light signal that receives is mail to the ring of light return control module 302, and will return the light signal that control module 302 receives from the ring of light and send.
This optical transceiver module 301 can be that the form with plug connector is connected in the outside protective relaying device; for protective relaying device provides optical fiber interface; can charged insertion or pull up; in charged insertion or when pulling up a module, do not influence the operate as normal of multiplexing other parts of protection switching device shifter.In actual applications, select to install the optical transceiver module 301 of respective type and/or quantity according to the type and/or the quantity of protective relaying device.The type of protective relaying device is meant single mode or multimode.The optical fiber interface type of described protective relaying device can be the optical fiber interface of single mode or multimode, and the optical fiber interface of different rates.Among this figure, select to have pegged graft two optical transceiver modules 301, transmit two ways of optical signals simultaneously.
The ring of light returns control module 302, is used for the light signal that optical transceiver module 301 receives is mail to photodissociation sign indicating number Clock Extraction module 303; And the light signal that light coding module 307 receives mail to optical transceiver module 301.
This ring of light returns control module 302 and also has the loopback test function, and the light signal that is about to receive directly returns to optical transceiver module 301 under other the transmission medium or the situation of selected transmission medium, is spread out of by optical fiber interface.Judge that by checking the signal that sends and receive whether the optical fiber interface operating state is normal, is convenient to maintenance management.
Photodissociation sign indicating number Clock Extraction module 303 is used for the light signal that receives is carried out Clock Extraction, and the signal type information of clock and light signal is issued light encoding and decoding control and clock selection module 304; And under the control of light encoding and decoding control and clock selection module 304, finish photodissociation sign indicating number to light signal, obtain low speed data, and this low speed data is mail to receipts buffer 305.
Light encoding and decoding control and clock selection module 304, the signal type information that is used to receive clock that photodissociation sign indicating number Clock Extraction module 303 provides and light signal is finished the setting of light signal encoding and decoding, signal rate and clock mode, and provide the encoding and decoding control information for photodissociation sign indicating number Clock Extraction module 303 and light coding module 307, and for the transmitting-receiving of photoelectricity/electrooptic conversion module 201 light signals provides low-speed clock, for the transmitting-receiving of 2M signal in minute multiple connection module 202 provides the 2M that is synchronized with the light signal low-speed clock clock.
Described clock mode comprises the master clock mode and from clock mode.Under the mode of master clock, light encoding and decoding control and clock selection module 304 are that the low-speed clock that is produced voluntarily by this light encoding and decoding control and clock selection module 304 is set in the transmitting-receiving of photoelectricity/electrooptic conversion module 201 light signals; And provide the 2M clock that is synchronized with this light encoding and decoding control and clock selection module 304 low-speed clocks to minute multiple connection module 202.Under the mode of clock, light encoding and decoding control and clock selection module 304 are that low-speed clock is set in the transmitting-receiving of photoelectricity/electrooptic conversion module 201 light signals, the low-speed clock of this low-speed clock for obtaining by photodissociation sign indicating number Clock Extraction module 303 provides the 2M clock that is synchronized with the low-speed clock that obtains by photodissociation sign indicating number Clock Extraction module 303 to minute multiple connection module 202.
In transmission system, need to guarantee that the protective relaying device and the multiplexing protection switching device shifter clock between low speed optical fiber interface and the 2M transmission line of participation transmission are in full accord.If wherein a protective relaying device is made as master clock, then the multiplexing protection switching device shifter between other protective relaying device and all low speed optical fiber interfaces and the 2M transmission line all needs to be made as from clock; If wherein the multiplexing protection switching device shifter between low speed optical fiber interface and the 2M transmission line is made as master clock, then transmitting the low speed optical fiber interface of opposite end and the multiplexing protection switching device shifter between the 2M transmission line and other protective relaying device all should be made as from clock.
Receive buffer 305: the low speed data that buffer-stored photodissociation sign indicating number Clock Extraction module 303 provides, and this low speed data mail to data multiplex module 401.
Send out buffer 306: the low speed data that divides the demultiplexed data module 405 in the multiple connection module 202 to provide is provided, and these data are mail to light coding module 307.
Light coding module 307, receive and send out the low speed data that buffer 306 provides, under the control of light encoding and decoding control and clock selection module 304, low speed data is carried out the light coding according to low-speed clock, generate light signal, this light signal is mail to the ring of light return control module 302.
In the application, optical transceiver module 301, the ring of light that comprises in photoelectricity/electrooptic conversion module 201 returns control module 302, photodissociation sign indicating number Clock Extraction module 303, receipts buffer 305, sends out the way decision of the quantity of buffer 306 and light coding module 307 by the light signal of required transmission, and promptly each group optical transceiver module 301, the ring of light return the processing that control module 302, photodissociation sign indicating number Clock Extraction module 303, receipts buffer 305, a buffer 306 and light coding module 307 are finished one road light signal.
Divide multiple connection module 202, as shown in Figure 4, be used for the multiplexing and demultiplexing of the signal of telecommunication, finish low speed data, specifically comprise to the conversion between the 2M signal:
Concrete multiplex process is: data multiplex module 401 produces the 2M frame structure by the data format of setting, and for example, the frame length of a frame is 256 bit, is divided into 32 time slots, and a time slot is 8 bit.Per second has 8k Frame by interface, i.e. speed is 64Kb/s during the transmission of each time slot.32 time slots are that time slot 0 arrives time slot 31, and wherein, time slot 0 is a frame head, is used for signal Synchronization; Time slot 31 is used for transmission network management information; Time slot 1 uses to the user to time slot 30, is used to transmit data.Data multiplex module 401 is inserted into low speed data in the time slot of above-mentioned transmission data, and unnecessary time slot does not insert data.When receiving the two-way low speed data, the time slot of 2M frame structure is divided into two groups, under the control of 2M clock, the low speed data that two-way is different is inserted into respectively among two time slots groupings.
Described time slot is divided into the implicit or artificial mode of setting to be realized.
Implicit mode is for the time slot with the 2M frame structure is divided into isometric some groups, and the multi-path low speed data that are used for the identical traffic speed that will receive are inserted each group time slot respectively, finish multiplexing.Artificial setting means be the multichannel data according to different transmission rates, artificially the time slot of 2M frame structure is divided into some groups of respective length, and the multi-path low speed data that are used for the different transmission rates that will receive are inserted each respectively and organized time slot.
Data loopback control module 402 is used to receive the 2M signal of data multiplex module 401, and this 2M signal is mail to markers insert module 403; And the 2M signal of data switching module in the receiving lines automatic switchover module 203, this 2M signal is mail to data demultiplexing module 405.
This data loopback control module 402 can realize the loopback control of both direction, to support the loopback test of E1 interface side and optical fiber interface side.
Markers insert module 403, the 2M signal that receives is carried out piecemeal, according to reception is each piece 2M signal joining day label in turn in proper order, the time tag here can be inserted in the time slot 0 or certain idle time slot of 2M signal data frame, and the 2M signal of joining day label is mail to cyclic redundancy check (CRC) insert module 404.
Cyclic redundancy check (CRC) insert module 404, be used for the 2M signal of above-mentioned adding label is carried out verification by CRC-4 verification rule, and generation check code word, check code word is inserted in the time slot 0 of 2M signal data frame, finish the conversion of 2M signal, the 2M signal after this conversion is mail to circuit automatic switchover module 203.
Concrete demultiplexing process is: data demultiplexing module 405 extracts the frame structure of the 2M signal that receives, extract the two-way low speed data according to the time slot grouping of the described frame structure of data multiplex before, and divide two-way to mail to photoelectricity/electrooptic conversion module 201 this two-way low speed data.For example, under implicit mode group mode, the frame structure of 2M signal is divided into two groups.Be that time slot 1 is first group to time slot 15, time slot 15 is second group to time slot 30.From two groups of time slots, extract low speed data wherein respectively, so just obtained the two-way low speed data, receive in the buffers 305 for two that this two-way low speed data is dealt into respectively in photoelectricity/electrooptic conversion module 201.
If the multiplexed realization of data is not based on the PCM mode, then divide the realization of multiple connection module 202 to be not limited to branch multiple connection module 202, realize by other modules that can realize data multiplex.
Circuit automatic switchover module 203 as shown in Figure 5, realizes that the redundancy of 2M signal sends and the reception redundant circuit, and selects wherein a road good 2M signal of transmission quality, switches can't harm circuit.
When sending the 2M signal, the 2M signal is divided into two-way exports from two E1 interfaces.
When receiving the 2M signal, harmless circuit switching of the present utility model is to adjust by the propagation delay time of carrying out that the 2M signal is produced when transmit in different paths in network to finish.Below to describe circuit automatic switchover step of the present utility model in detail.
Because the redundant transmission of E1 interface, the therefore 2M signal of 2 road E1 interfaces input mails to respectively that two markers are extracted alignment of data modules 501, clock switches and level and smooth module 505, two transmission quality analysis modules 503.
Markers is extracted alignment of data module 501, is used for that the 2M signal is carried out time tag and extracts, and according to the time tag that extracts two paths of data is carried out alignment of data.Two markers are extracted alignment of data module 501 the two-way 2M signal that aligns are stored into respectively in two buffers 502, storage order is according to the different time label on corresponding 2M signal buffer-stored successively, be that the less data block of time label deposits forward address section in, the storage organization of two buffers 502 is identical, to make things convenient for reading and aliging of data.The buffer 502 here can be the first in first out buffer.Time tag also can adopt sequence number to replace.
Transmission quality analysis module 503 is used for according to cyclic redundancy check code word 2 road 2M signals being carried out the analysis of transmission quality respectively, and analysis result is transferred to circuit switching controls module 504.
Circuit switching controls module 504 is used for selecting a road good 2M signal of transmission quality according to analysis result, transmit control signal to data switching module 506, the corresponding 2M signal of control data handover module 506 transmission simultaneously, sends to clock with switching command and switches and level and smooth module 505.
Clock switches and level and smooth module 505, be used to receive two-way 2M signal, extract 2M clock wherein respectively, and the 2M clock of two-way 2M signal is carried out smoothing processing according to the switching command of circuit switching controls module 504, be about to two-way 2M clock through phase-locked loop output, when assurance switched to another circuit from a circuit, clock remained unchanged.Clock switches with level and smooth module 505 provides the 2M clock of exporting through phase-locked loop for buffer 502, and buffer 502 is used for handling the 2M signal according to the 2M chock smotthing of handling through phase-locked loop, sends this 2M signal to data switching module 506.
This circuit automatic switchover module 203 can be selected two kinds of handoff procedures, is respectively alarm handoff procedure and error code handoff procedure.
The alarm handoff procedure: the 2M signal that transmission quality analysis module 503 is stored each transmission line simultaneously carries out the alarm of dropout, alarm indication, frame remote alarm, multi-frame remote alarm, OOF etc. respectively and checks.Alarm if detect wherein one road 2M signal, then this road 2M signal can not use, and is directly switch to the 2M signal transmission of another road, up to that road 2M signal that alarm has taken place recover normal till.
The problem that the alarm handoff procedure exists is that a certain circuit-switched data for transmitting detects alarm signal suddenly, then should switch to another road transmission line at once.Since when the alarm situation occurring, the 2M signal generation gross error that is spreading out of, and as the 2M dropout, this moment, this road 2M clock also can not be used again.If be directly switch to another road, because two-way clock phase difference will inevitably cause between the two-way to differ, directly switching can cause serious phase place damage and the 2M signal of output is sustained damage.Clock switching of the present utility model is with smoothly module 505 is at this problem, and for the two-way clock signal is provided with phase-locked loop circuit, the 2M clock is synchronous when guaranteeing directly to switch.
Error code handoff procedure:, then enter the error code handoff procedure if two-way 2M signal does not all go out the present condition alarm.2M signal in 503 pairs of two buffers 502 of transmission quality analysis module carries out bit error code, coding error code, frame error code, the inspection of CRC error code, also can carry out the M2100 analysis and wait detection data error code, and then can calculate the circuit error rate.Circuit switching controls module 304 can select bit error code to switch or the switching of grade error code according to different customer requirements.
If the circuit error rate reaches certain rank, as 10e-4,10e-6 etc., just switch, then be called the grade error code and switch, the grade error code switches and can only could switch when one tunnel transmission performance drops to the grade of setting, therefore can not improve the circuit error code class.
If the just generation switching of single error code has appearred in the 2M signal that detects in the buffer 502, be called bit error code and switch.Bit error code switches requirement to be judged fast, switches fast, need be very accurate for reading of data.Align just because of 501 couples of two-way 2M of Clock Extraction alignment of data module signal, the identical address position of two buffers 502 should deposit identical 2M signal in.Even so switch back and forth between two buffers 502, dateout can not occur mistake yet and promptly damage.Because the two-way transmission is two fully independently transmission systems, the probability that error code takes place this two-way simultaneously reduces greatly, therefore can improve error performance, reaches the harmless effect of switching.
The utility model also provides virtual loopback interface, can carry out loopback test to the transfer of data of optical fiber interface side and E1 interface side respectively by data loopback control module 402, wherein:
In the optical fiber interface side: light signal can transmit signal transmission direction by the optical fiber interface input direction to the optical fiber interface outbound course: optical fiber interface → optical transceiver module 301 → ring of light returns control module 302 → photodissociation sign indicating number Clock Extraction module 303 → receipts buffer 305 → data multiplex module 401 → data loopback control module 402 → data demultiplexing module 405 → buffer 306 → light coding module 307 → ring of light and returns control module 302 → optical transceiver module 301 → optical fiber interface.
At the E1 interface side: the 2M signal can transmit signal transmission direction by E1 interface input direction to E1 interface outbound course: E1 interface → markers is extracted alignment of data module 501 → buffer 502 → data switching module 506 → data loopback control module 402 → markers insert module 403 → cyclic redundancy check (CRC) insert module 404 → E1 interface.
By this loopback test function, can verify whether the transmission line of E1 interface side and optical fiber interface side is unobstructed, to make things convenient for the opening of equipment and circuit, fault detect and maintenance.
The above is preferred embodiment of the present utility model only, is not to be used to limit protection range of the present utility model.
Claims (9)
1, the multiplexing protection switching device shifter between a kind of low speed optical fiber interface and the 2M transmission line includes the photoelectricity/electrooptic conversion module based on the low speed optical fiber interface, branch multiple connection module, the circuit automatic switchover module that are electrically connected successively, it is characterized in that:
Photoelectricity/electrooptic conversion module, be used to receive multipath light signal, multipath light signal obtains corresponding multi-path low speed data through opto-electronic conversion, these multi-path low speed data and the 2M clock that is synchronized with the light signal low-speed clock are mail to branch multiple connection module, and will carry out light coding from the multi-path low speed data that minute multiple connection module receives and obtain multipath light signal, and multipath light signal is sent respectively;
Divide the multiple connection module, the multi-path low speed data that are used for photoelectricity/electrooptic conversion module is received are carried out multiplexed, multiplexing one road 2M Frame that becomes, reception order according to low speed data is inserted time tag in the 2M Frame, and insertion cyclic redundancy check code word, under the control of the 2M clock that receives, send the 2M signal of forming by the 2M Frame to circuit automatic switchover module, and automatically switch 2M signal that module receives of circuit carried out demultiplexing and handle, be reduced to corresponding multi-path low speed data, issue photoelectricity/electrooptic conversion module;
Circuit automatic switchover module, being used for being divided into two-way by the 2M signal that minute multiple connection module obtains sends, and with the two-way 2M signal that receives by time tag sorting alignment, and do the transmission quality analysis according to cyclic redundancy check code word, select wherein a road good 2M signal of transmission quality, issue branch multiple connection module.
2, the multiplexing protection switching device shifter between low speed optical fiber interface according to claim 1 and the 2M transmission line, it is characterized in that, described photoelectricity/electrooptic conversion module, include a plurality of optical transceiver modules that optical fiber interface is provided, be used for receiving optical signals, and realization and the ring of light return the optical signal transceiver between control module; The ring of light that is used for the signal loopback test returns control module; The light encoding and decoding control and the clock selection module that are used to provide synchronised clock and send light encoding and decoding control information to photodissociation sign indicating number Clock Extraction module and light coding module; Be used for according to light encoding and decoding control information, the ring of light is returned the light coding module that light signal that control module receives is decoded into the photodissociation sign indicating number Clock Extraction module of low speed data and is used for low speed data is encoded into light signal; Be used to store low speed data that photodissociation sign indicating number Clock Extraction module sends, and this low speed data mail to the receipts buffer of branch multiple connection module; Be used to receive branch multiple connection module low speed data, and this low speed data is mail to the buffer of sending out of light coding module.
3, the multiplexing protection switching device shifter between low speed optical fiber interface according to claim 1 and the 2M transmission line, it is characterized in that, described minute multiple connection module the multi-path low speed data that are used to receive photoelectricity/electrooptic conversion module and provide is provided, and this multi-path low speed data multiplex become one road 2M signal, issues the data multiplex module of data loopback control module; Be used to receive the 2M signal that data loopback control module is sent, and this 2M signal is demultiplexed into data demultiplexing module into the multi-path low speed data; Be used to receive the 2M signal that data loopback control module is sent, time tag be inserted into the markers insert module of the 2M signal after multiplexing according to the reception order; Be used to receive the 2M signal of markers insert module after time tag inserts, cyclic redundancy check (CRC) code be inserted into the 2M signal after time tag inserts and send the cyclic redundancy check (CRC) insert module of this 2M signal to circuit automatic switchover module direction; The data loopback control module that is used for optical fiber interface side and E1 interface side loopback test.
4, the multiplexing protection switching device shifter between low speed optical fiber interface according to claim 1 and the 2M transmission line, it is characterized in that, described circuit automatic switchover module includes the markers extraction alignment of data module that two 2M signals that are used for that two E1 interfaces are received carry out alignment of data; Two buffers that are used to store through the 2M signal of markers alignment; Two are used for according to cyclic redundancy check code word the 2M signal that receives by two E1 interfaces being carried out the transmission quality analysis module that transmission quality is analyzed; Be used for the 2M signal that two E1 interfaces are received is carried out clock selecting and level and smooth clock switching and level and smooth module; Be used for selecting switchover policy, sending the circuit switching controls module of switching controls order according to the analysis result of transmission quality analysis module; Be used for according to the switching controls command selection of circuit switching controls module and send the data switching module that data are switched between two buffers.
5, the multiplexing protection switching device shifter between low speed optical fiber interface according to claim 2 and the 2M transmission line is characterized in that, described optical transceiver module is pluggable plug connector.
6, the multiplexing protection switching device shifter between low speed optical fiber interface according to claim 2 and the 2M transmission line is characterized in that, described a plurality of optical transceiver modules according to protective relaying device quantity, are installed the optical transceiver module of respective numbers.
7, the multiplexing protection switching device shifter between low speed optical fiber interface according to claim 2 and the 2M transmission line is characterized in that the type of described optical transceiver module is corresponding with the type of protective relaying device.
8, the multiplexing protection switching device shifter between low speed optical fiber interface according to claim 1 and the 2M transmission line is characterized in that, described two E1 interfaces are connected respectively to SDH network or PDH network or the direct transmission line that links to each other etc.
9, the multiplexing protection switching device shifter between low speed optical fiber interface according to claim 1 and the 2M transmission line is characterized in that, described 2M signal is specially and meets G.703 and the G.704 standard 2M digital signal of suggestion of ITU-T.
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| CNU2008201092890U CN201234126Y (en) | 2008-07-16 | 2008-07-16 | Multiplex protection switching device between low-speed optical fiber interface and 2M transmission line |
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| CNU2008201092890U CN201234126Y (en) | 2008-07-16 | 2008-07-16 | Multiplex protection switching device between low-speed optical fiber interface and 2M transmission line |
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| CN101826722A (en) * | 2010-05-20 | 2010-09-08 | 山西省电力公司电力通信中心 | Relay protecting private channel switching system of high-voltage electric power circuit |
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| CN101826722A (en) * | 2010-05-20 | 2010-09-08 | 山西省电力公司电力通信中心 | Relay protecting private channel switching system of high-voltage electric power circuit |
| CN103929246A (en) * | 2010-09-29 | 2014-07-16 | 江苏省电力公司常州供电公司 | Working method of optical path switching interface mechanism for optical fiber channel test of relay protection device |
| CN103929244A (en) * | 2010-09-29 | 2014-07-16 | 江苏省电力公司常州供电公司 | Working method of optical path switching interface mechanism of relay protection device |
| CN103929246B (en) * | 2010-09-29 | 2016-06-15 | 江苏省电力公司常州供电公司 | The method of work of switching-over light path interface agency for the optical-fibre channel of protective relaying device |
| CN103929244B (en) * | 2010-09-29 | 2016-06-22 | 江苏省电力公司常州供电公司 | The method of work of the switching-over light path interface agency of protective relaying device |
| CN103036728A (en) * | 2012-12-27 | 2013-04-10 | 中国船舶重工集团公司第七二二研究所 | Multi- redundancy ethernet data transmission system and transmission method |
| CN106021157A (en) * | 2015-03-30 | 2016-10-12 | 日本电气株式会社 | Computer mounting multiple modules facilitating opening/expansion control process with connectors |
| CN106021157B (en) * | 2015-03-30 | 2020-06-23 | 日本电气株式会社 | Computer with connector for installing multiple modules for easy opening/expanding control process |
| CN109104240A (en) * | 2018-08-08 | 2018-12-28 | 国网山东省电力公司信息通信公司 | Relay protection signal Transmission system and method based on OLP and 2M optical interface |
| CN109151344A (en) * | 2018-09-26 | 2019-01-04 | 深圳蓝集科技有限公司 | A kind of automatic redundant transmission device of wireless image transmission |
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