CN207098602U - A kind of equipment for protecting optical fibre longitudinal difference - Google Patents
A kind of equipment for protecting optical fibre longitudinal difference Download PDFInfo
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- CN207098602U CN207098602U CN201720849462.XU CN201720849462U CN207098602U CN 207098602 U CN207098602 U CN 207098602U CN 201720849462 U CN201720849462 U CN 201720849462U CN 207098602 U CN207098602 U CN 207098602U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
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Abstract
The utility model provides a kind of equipment for protecting optical fibre longitudinal difference, including microprocessor module, CPLD modules, and the microprocessor module connects CPLD modules；The CPLD modules send processing module, channel coding module including transmission buffer, the frame being sequentially connected；The CPLD modules also include the reception buffer, frame receiving processing module, channel decoding module being sequentially connected；The CPLD modules also include clock module, the input of the output end connecting channel coding module of the clock module；The output end of the clock module is also connected with the input of Clock Extraction module.Equipment for protecting optical fibre longitudinal difference protection circuit both sides device described in the utility model need not distinguish slave, be easy to engineer applied, effectively reduce the cumbersome of system design realization；Slave is not differentiated between, to provide great convenience in engineering, operation maintenance personnel workflow simplifies, and system O＆M cost reduces.
Description
Technical field
The utility model belongs to track traffic relay protection field, more particularly, to a kind of equipment for protecting optical fibre longitudinal difference.
Background technology
The application of optical-fiber longitudinal difference protection is respectively placed in the two of protection circuit based at least two protection devices, two table apparatus
End, it is to carry out route protection by the difference of the circuit electrical quantity of alternative route both ends in the same time that it, which protects general principle,.
It is same that the difficult point of optical fiber differential protective is that the data of the circuit both sides for calculating must be reflected as circuit both ends
The electrical quantity situation at moment.How the sampling behavior of two self-contained units realizes that the synchronization of sampling is to realize longitudinal difference protection
The core technology of algorithm.
Currently used for realizing that the engineering method of longitudinal difference protection data syn-chronization mainly has：Sampling instant method is adjusted, GPS is same
Footwork.
Adjust sampling instant method, the data of both sides need to be divided into a master one from, by measurement obtain the sampling of two end devices
The time difference, the sampling instant of slave is progressively adjusted to and host synchronization, so as to realize the synchronized sampling of the end device of circuit two.The party
Method must distribute slave in advance, and engineering flexibility is poor；Adjustment sampling instant needs the bottom-layer design of adjustment system, realizes difficulty
Greatly, risk factor is high.
GPS Synchronos methods, both sides device is regardless of principal and subordinate, and both sides device is by respective gps satellite clock time service, and device is to defend
Sampled on the basis of star clock, so as to realize both sides sample-synchronous, data syn-chronization.This method depends critically upon satellite clock equipment,
Construction investment is big；Gps signal is difficult to ensure that the synchronization of sampling after losing, reliability is low.
The content of the invention
In view of this, the utility model is directed to a kind of equipment for protecting optical fibre longitudinal difference, with solve prior art expense into
This height, complicated, the situations such as the data syn-chronization degree of accuracy is low.
To reach above-mentioned purpose, what the technical solution of the utility model was realized in：
A kind of equipment for protecting optical fibre longitudinal difference, including microprocessor module, CPLD modules, the microprocessor module connection
CPLD modules；The CPLD modules send processing module, channel coding module including transmission buffer, the frame being sequentially connected；Institute
The input of the output end linkup transmit buffer of microprocessor module is stated, the output end connection frame of the transmission buffer is sent
The input of processing module, the frame sends the signal input part of the output end connecting channel coding module of processing module, described
The output end connection fiber optic transmitter of channel coding module；
The CPLD modules also include the reception buffer, frame receiving processing module, channel decoding module being sequentially connected；Institute
The input connection for stating microprocessor module receives the output end of buffer, and the input connection frame for receiving buffer receives
The output end of processing module, the output end of the input connecting channel decoder module of the frame receiving processing module, the channel
The input connection fiber optic receiver of decoder module；
The CPLD modules also include clock module, the input of the output end connecting channel coding module of the clock module
End；The output end of the clock module is also connected with the input of Clock Extraction module, and the output end of the Clock Extraction module connects
The input of channel decoding module is connect, the output end of the Clock Extraction module is also connected with frame receiving processing module, the clock
The output end of extraction module is also connected with the input of channel decoding module, and the input of the Clock Extraction module is also connected with optical fiber
The output end of receiver.
Further, the CPLD modules also include frame traffic time mark generator, and the output end connection frame of the clock module leads to
Believe the input of time mark generator, the output end and frame of the frame receiving processing module send processing module output end all connect it is described
The input of frame traffic time mark generator, the frame send the input of the output end connection microprocessor module of processing module, and frame leads to
Believe that time mark generator includes frame and sends timer and frame reception timer, the output end connection microprocessor module of frame traffic time mark generator
Input.
Further, the frame, which sends processing module, includes parallel-to-serial converter, HDLC coding modules, CRC verification calculating
Module, the output end connection parallel-to-serial converter of the transmission buffer, the output end connection HDLC of the parallel-to-serial converter
The input of coding module and the input of CRC check computing module, the output end and CRC check meter of the HDLC coding modules
Calculate the input of module output end all connecting channel coding modules.
Further, the frame receiving processing module includes serial-parallel conversion circuit, CRC check module, HDLC decoding moulds
Block, the input of the output end connection HDLC decoder modules of the channel decoding module, the output end of the HDLC decoder modules
The input of CRC check module and the input of serial-parallel conversion circuit are connected, the output end of the serial-parallel conversion circuit connects
Receive the input of buffer, the input of the output end connection microprocessor module of the CRC check module.
Further, the transmission buffer and reception buffer are all realized using asynchronous fifo modules；The microprocessor
The model MPC8315 of device module, the microprocessor module are also connected with DDR2 memory bars.
Relative to prior art, equipment for protecting optical fibre longitudinal difference described in the utility model has the advantage that：
(1) equipment for protecting optical fibre longitudinal difference protection circuit both sides device described in the utility model need not distinguish slave, just
In engineer applied, the cumbersome of system design realization is effectively reduced；Slave is not differentiated between, to provide great convenience in engineering,
Operation maintenance personnel workflow simplifies, and system O＆M cost reduces；Clock source signals have been reduced to lose for longitudinal difference protection sampling together
The baneful influence of step, substantially increases synchronization dependability, and construction costs significantly reduces；Multichannel caused by internal clocking module locks phase
Clock, provided reliably for multiple modules in system, accurate work clock, assistance completes accurate channel coding, decodes
Etc. function, the reliability of communication link is substantially increased.
(2) during the transmitting-receiving of equipment for protecting optical fibre longitudinal difference frame traffic time mark generator self-recording unit described in the utility model
Carve, accuracy of timekeeping is up to 1000/1024us.Occupying system resources are few, and markers function is carried out automatically, and accuracy of timekeeping is high, timing
Moment is accurate；Coordinate the clock of software to overflow compensation function, greatly improve the accuracy of data syn-chronization algorithm, so that vertical poor
Protection is accurately calculated, and this programme design production cost is low, and reliability is high, and is easy to upgrading to transplant, and has very high engineering
Flexibility.
Brief description of the drawings
Form a part of accompanying drawing of the present utility model to be used for providing further understanding to of the present utility model, this practicality is new
The schematic description and description of type is used to explain the utility model, does not form to improper restriction of the present utility model.
In accompanying drawing：
Fig. 1 is the equipment for protecting optical fibre longitudinal difference theory structure schematic diagram described in the utility model embodiment；
Fig. 2 is the schematic diagram of synchronized algorithm first of the equipment for protecting optical fibre longitudinal difference described in the utility model embodiment；
Fig. 3 is the schematic diagram of synchronized algorithm second of the equipment for protecting optical fibre longitudinal difference described in the utility model embodiment.
Embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the utility model can
To be mutually combined.
In description of the present utility model, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " on ", " under ",
The orientation or position relationship of the instruction such as "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outer " are
Based on orientation shown in the drawings or position relationship, it is for only for ease of description the utility model and simplifies description, rather than instruction
Or imply that signified device or element must have specific orientation, with specific azimuth configuration and operation, therefore be not understood that
For to limitation of the present utility model.In addition, term " first ", " second " etc. are only used for describing purpose, and it is not intended that instruction
Or imply relative importance or the implicit quantity for indicating indicated technical characteristic.Thus, " first ", " second " etc. are defined
Feature can express or implicitly include one or more this feature.In description of the present utility model, unless separately
It is described, " multiple " are meant that two or more.
, it is necessary to which explanation, unless otherwise clearly defined and limited, term " are pacified in description of the present utility model
Dress ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integratedly
Connection；Can be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected by intermediary,
It can be the connection of two element internals.For the ordinary skill in the art, on being understood by concrete condition
State concrete meaning of the term in the utility model.
Describe the utility model in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
A kind of as shown in figure 1, equipment for protecting optical fibre longitudinal difference, it is characterised in that：Including microprocessor module, CPLD modules,
The microprocessor module connects CPLD modules；The CPLD modules include transmission buffer, the frame transmission processing being sequentially connected
Module, channel coding module；The input of the output end linkup transmit buffer of the microprocessor module, it is described to send buffering
The output end connection frame of device sends the input of processing module, and the frame sends the output end connecting channel coding mould of processing module
The signal input part of block, the output end connection fiber optic transmitter of the channel coding module；
The CPLD modules also include the reception buffer, frame receiving processing module, channel decoding module being sequentially connected；Institute
The input connection for stating microprocessor module receives the output end of buffer, and the input connection frame for receiving buffer receives
The output end of processing module, the output end of the input connecting channel decoder module of the frame receiving processing module, the channel
The input connection fiber optic receiver of decoder module；
The CPLD modules also include clock module, the input of the output end connecting channel coding module of the clock module
End；The output end of the clock module is also connected with the input of Clock Extraction module, and the output end of the Clock Extraction module connects
The input of channel decoding module is connect, the output end of the Clock Extraction module is also connected with frame receiving processing module, the clock
The output end of extraction module is also connected with the input of channel decoding module, and the input of the Clock Extraction module is also connected with optical fiber
The output end of receiver.
Clock module is used for inside generation system the Multi-path synchronous phase-locked clock used, and module input is outside cpld
Portion 65.536Mhz clock signal, the clock signal carry out same-phase scaling down processing in clock module, produce frequency all the way respectively
Rate 512khz clock signal clk512, all the way frequency 1Mhz clock signal clk1m, all the way frequency 2Mhz clock signal
Clk2m, frequency is 4Mhz clk4m all the way, and frequency is 8Mhz clk8m all the way, and frequency is 32Mhz clk32m all the way.
Caused clock signal locks phase each other.
Clk512 and clk2m signals are supplied to channel coding module to realize channel coding, will be to be sent original
512kbit/s serial code is encoded to 2Mbit/s serial data stream.
Clk8m, clk32m signal are supplied to Clock Extraction module, for the serial data stream code of the 2Mbit/s to reception
Member identification, locks phase.
Clock Extraction module utilizes clk8m caused by local clock module, clk32m in-phase clock signals, and tracking receives
2Mbit/s serial data stream symbol change, produce be synchronized with serial data stream 2Mhz and 512khz reception clock
Signal, and be supplied to channel decoding module to use, 2Mhz clocks are to receive decoding clock, for the decoding of channel decoding module,
512khz clocks are supplied to receiving processing module, for completing HDLC decodings.
The 2Mbit/s of Clock Extraction module reception optical fiber input data flow, module use 32Mhz high frequency clock signal
16 frequency dividers are supplied to, the frequency divider produces the 2Mhz clock signals with 32Mhz input clocks lock phase, while Clock Extraction mould
Block catches the 0/1 character interleaved situation received in data flow using 32Mhz clock signal, and data are captured in each generation
In stream 0/1 conversion when, 16 frequency dividers are once initialized, so that 2Mhz clock signal caused by 16 frequency dividers
PGC demodulation is generated with the 0/1 conversion moment in data flow, realizes and connects so that 2Mhz receives decoding clock signal
Receive the synchronization of data bit in data flow.
As shown in figure 1, the CPLD modules also include frame traffic time mark generator, the output end connection frame of the clock module leads to
Believe the input of time mark generator, the output end and frame of the frame receiving processing module send processing module output end all connect it is described
The input of frame traffic time mark generator, the frame send the input of the output end connection microprocessor module of processing module, and frame leads to
Believe that time mark generator includes frame and sends timer and frame reception timer, the output end connection microprocessor module of frame traffic time mark generator
Input.Frame traffic time mark generator is to send the transmission situation of processing module and the reception condition of frame receiving module for monitoring frame
Wherein, the frame, which sends processing module, includes parallel-to-serial converter, HDLC coding modules, CRC check computing module,
The output end connection parallel-to-serial converter of the transmission buffer, the output end connection HDLC coding moulds of the parallel-to-serial converter
The input of block and the input of CRC check computing module, the output end and CRC check computing module of the HDLC coding modules
The input of output end all connecting channel coding modules.
Wherein, the frame receiving processing module includes serial-parallel conversion circuit, CRC check module, HDLC decoder modules, described
The input of the output end connection HDLC decoder modules of channel decoding module, the output end connection CRC of the HDLC decoder modules
The input of inspection module and the input of serial-parallel conversion circuit, the output end connection of the serial-parallel conversion circuit receive buffer
Input, the CRC check module output end connection microprocessor module input.
Wherein, the transmission buffer and receive buffer all using asynchronous fifo modules realize；The microprocessor mould
The model MPC8315 of block, the microprocessor module are also connected with DDR2 memory bars.Buffer is sent and received by asynchronous FIFO
Realize, for completing the data buffering between microprocessor and frame transmission processing module, frame receiving processing module, solve microprocessor
Device and frame send processing module, the operating rate mismatch problem of frame receiving processing module.
The method of data synchronization of equipment for protecting optical fibre longitudinal difference, comprises the following steps：
After S1, CPLD module receive the data of microprocessor module collection, by data buffer storage to buffering area is sent, pass through
After frame sends the processing of processing module, send to channel coding module；
S2, channel coding module are carried out after changing by turn using clock module, the method that time-out is sent with reference to prevention, by number
According to the protection device of transmission to the other end；
The reception decoding clock that S3, channel decoding module provide according to Clock Extraction module is decoded, and will tentatively be solved
Data after code are sent to frame receiving processing module；
S4, frame receiving processing module are decoded to data, examined, and are sent to reception buffer and microprocessor mould
Block；
The automatic marker frame of S5, frame traffic time mark generator is sent and the frame time of reception, microprocessor module are inserted using Lagrange
Value method, sampled value in the same time is calculated, realizes synchronized sampling.
Wherein, in step S1, frame sends the processing method of processing module, specific as follows：
S101, frame send processing module from receiving to obtain data in buffer, and parallel-serial conversion is carried out to data；
S102, serial data calculate through HDLC coded treatments and CRC check, and addition is having CRC check result of calculation automatically
Imitate the least significant end of data flow；
S103, serial data stream are sent into follow-up channel coding module.
Wherein, 1b4b conversions are carried out to initial data using clock information in the step S2, conversion method principle is, former
The corresponding conversion of beginning 1bit data ' 1 ' is 4bits serial data " 1100 ", and original 1bit data " 0 ", corresponding conversion is 4bits's
Serial data " 1010 ", after so conversion, regardless of original data content, it is not in more in data flow after converting
In more than 2 continuous 1 or continuous 0, Clock Extraction can be carried out according to this feature from data flow by receiving side.
In the step S2, the method that prevention sends time-out is that the CPLD modules are sent to the protection device of the other end
During data, in data limiting time, such as detect that transmission is abnormal, reset will be transmitted by force, so as to ensure subsequently to send
Information is not influenceed by abnormal results.Frame sends the Sampling interrupt for being synchronized with vertical poor device, i.e. 1000 times/second, microprocessor is every
After the completion of secondary sampling, sampled data will be transmitted task accordingly, in transmission process, avoid fortuitous event, result in pair
The long lasting effect that follow-up data is sent, it is achieved that prevention sends timeout feature, in data limiting time, such as detect hair
Exception is sent, reset will be transmitted by force, so as to ensure that subsequently send information is not influenceed by abnormal results.
Wherein, step S3, in S4, the execution method of channel decoding module and frame receiving processing module is specific as follows：
S201, Clock Extraction module carry out clock recovery from the data received, extract from data flow and accurately connect
Decoding clock signal is received, is supplied to channel decoding module to use clock signal；
The reception decoding clock that S202, channel decoding module are provided using Clock Extraction module, channel is carried out to data stream
Decoding, valid string and decoded in automatic identification data flow；
Field ' 1100 ' in data flow is decoded as ' 1 ' by S203, channel decoding module, and field ' 1010 ' is decoded as
' 0 ', decoded data are sent to frame receiving processing module in real time；
The data flow received is carried out HDLC decoding process by S204, frame receiving processing module, and decoded data are carried out
CRC check, check results is marked temporary, is subsequently obtained by microprocessor module, frame receiving processing module solves HDLC
Data write-in receives buffer after code, and can be produced after the completion of HDLC decodings and receive interrupt signal to microprocessor module；
After S205, microprocessor module receive interruption useful signal, CRC certification labels in judgment frame receiving processing module
Result, if mark is effective, frame data are obtained from receiving in buffer；If marked invalid, microprocessor module enters wrong frame
Processing state；
The frame receiving processing module, which have also been devised, receives that content frame is anti-stacked plus function, and guarantee often detects a new number
During according to frame, automatic remove receives data in buffer, avoids the content of different pieces of information frame from being superimposed.
Such as Fig. 2, shown in Fig. 3, it is described realize synchronized sampling specific method it is as follows：
S301, optical-fiber longitudinal difference relay protection need to set two identicals at protection circuit both ends respectively to realize to protect
Device, if side device code name is L (local), opposite side device code name is R (Remote), device L and device R working methods
It is identical；
S302, sampling interval of device is set as time Ts, under engineering specifications, device L and device R are according to respective work
Data acquisition is carried out with the Ts sampling intervals under state, the respective sampling instant of stream oriented device is difficult to synchronization, each protection device sampling
Being sent in after each sampling action terminates for value is carried out at once, therefore the transmission interval of each protection device sampled value is equal to and adopted
Sample interval Ts；
S303, device L a certain sampling instant is set as t1, if corresponding sampling value message delivery time is t1 ', if should
Message numbering in message is NLIf message is sent to being t2 at the time of device R, if the transmission delay between device L and device R
For T1, then T1=t2-t1 '；
S304, set the numbering N that device R receives device L transmissionsLMessage after carry out message reply, reply message in
Equally include numbering NL, show that R sends the corresponding relation that message sends message with L；
S305, set device R reply messages NLDelivery time be t3 ', the sampling instant of its corresponding R side is t3, if should
It is t4 at the time of message is received by device L, if the transmission delay between device R and device L is T2, then T2=t4-t3 ', work
In Cheng Yingyong, the transmission channel between device R and device L is connected up via identical route, and transmission range is identical, therefore T1=
T2；
The N replied in S306, device RLThe sampled value at R sides t3 moment is contained in message, determines L sides at the t3 moment
Sampled value, L is realized, sampling value difference calculates in the same time for R both sides；
S307, set L sides and correspond to synchronized sampling moment at t3 moment as t3 ＂, therefore t3 ＂=t3；
S308, L sides calculate t3 ＂ values, according to passage symmetry, T1=T2, i.e. t2-t1 '=t4-t3 '；If L and R it
Between the channel delay time be Td, then Td=T1=T2=(T1+T2)/2=(t4-t3 '+t2-t1 ')/2=((t4-t1 ')-
(t3’-t2))/2；What the frame traffic time mark generator do not surveyed can record the side message sends and receives the moment；That is L sides minute book side
T1 ' values, t4 values, the t3 ' values of R sides minute book side, t2 values, calculate Td values；
So t3 ＂=t3 '-t2+Td=t4-Td；Now, L sides can learn t3 ＂ value；
S309, sharp microprocessor module are calculated using Lagrange's interpolation；
Lagrangian calculation formula is as follows：
According to the mathematical sense of formula, it is understood that x0, x1, x2Three variate-values y corresponding with its0,y1,y2Three functions
Value, according to t3 " value, comprehensively sampling interval Ts, comparison selects front and rear 3 sampled values similar in t3 " to calculate, thus
Obtain the sampled value at L sides t3 " moment.The functional value y corresponding to x variate-values is calculated according to formula；It is exactly formula corresponding to t3 ＂
In x, t3 " sampled value is exactly the y in formula, so only it is to be understood that x0, x1, x2And y0,y1,y2Just, x0, x1, x2Between
Interval be all sampling interval Ts, x0, x1, x2The three continuous sampled points referred to, according to t3 " value and the difference of t1 values
Be known that send message is sampled between message to receiving several times again, then several sampled points t3 " nearby, be exactly for
x0, x1, x2Their each self-corresponding sampled values are exactly y0,y1,y2.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
Within the spirit and principle of utility model, any modification, equivalent substitution and improvements made etc., the utility model should be included in
Protection domain within.
Claims (5)
- A kind of 1. equipment for protecting optical fibre longitudinal difference, it is characterised in that：Including microprocessor module, CPLD modules, the microprocessor Module connects CPLD modules；The CPLD modules send processing module, channel coding including transmission buffer, the frame being sequentially connected Module；The input of the output end linkup transmit buffer of the microprocessor module, the output end of the transmission buffer connect The input that frame sends processing module is connect, the frame sends the signal input of the output end connecting channel coding module of processing module End, the output end connection fiber optic transmitter of the channel coding module；The CPLD modules also include the reception buffer, frame receiving processing module, channel decoding module being sequentially connected；It is described micro- The input connection of processor module receives the output end of buffer, the input connection frame reception processing for receiving buffer The output end of module, the output end of the input connecting channel decoder module of the frame receiving processing module, the channel decoding The input connection fiber optic receiver of module；The CPLD modules also include clock module, the input of the output end connecting channel coding module of the clock module； The output end of the clock module is also connected with the input of Clock Extraction module, the output end connection letter of the Clock Extraction module The input of road decoder module, the output end of the Clock Extraction module are also connected with frame receiving processing module, the Clock Extraction The output end of module is also connected with the input of channel decoding module, and the input of the Clock Extraction module is also connected with optical fiber reception The output end of device.
- 2. equipment for protecting optical fibre longitudinal difference according to claim 1, it is characterised in that：The CPLD modules also include frame traffic Time mark generator, the input of the output end connection frame traffic time mark generator of the clock module, the output of the frame receiving processing module The output end of end and frame transmission processing module all connects the input of the frame traffic time mark generator, and the frame sends processing module Output end connects the input of microprocessor module, and frame traffic time mark generator includes frame and sends timer and frame reception timer, frame The input of the output end connection microprocessor module of communication time mark generator.
- 3. equipment for protecting optical fibre longitudinal difference according to claim 1, it is characterised in that：The frame, which sends processing module, to be included simultaneously String change-over circuit, HDLC coding modules, CRC check computing module, the output end connection parallel-serial conversion electricity of the transmission buffer Road, the input of the input and CRC check computing module of the output end connection HDLC coding modules of the parallel-to-serial converter End, the output end of the HDLC coding modules and the input of CRC check computing module output end all connecting channel coding modules.
- 4. equipment for protecting optical fibre longitudinal difference according to claim 1, it is characterised in that：The frame receiving processing module includes string And change-over circuit, CRC check module, HDLC decoder modules, the output end connection HDLC decoder modules of the channel decoding module Input, the HDLC decoder modules output end connection CRC check module input and serial-parallel conversion circuit input End, the output end connection of the serial-parallel conversion circuit receive the input of buffer, the output end connection of the CRC check module The input of microprocessor module.
- 5. equipment for protecting optical fibre longitudinal difference according to claim 1, it is characterised in that：The transmission buffer and reception buffer Device is all realized using asynchronous fifo modules；The model MPC8315 of the microprocessor module, the microprocessor module also connect Connect DDR2 memory bars.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720849462.XU CN207098602U (en) | 2017-07-13 | 2017-07-13 | A kind of equipment for protecting optical fibre longitudinal difference |
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| CN201720849462.XU CN207098602U (en) | 2017-07-13 | 2017-07-13 | A kind of equipment for protecting optical fibre longitudinal difference |
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| CN207098602U true CN207098602U (en) | 2018-03-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107276053A (en) * | 2017-07-13 | 2017-10-20 | 天津凯发电气股份有限公司 | A kind of equipment for protecting optical fibre longitudinal difference and method of data synchronization |
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2017
- 2017-07-13 CN CN201720849462.XU patent/CN207098602U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107276053A (en) * | 2017-07-13 | 2017-10-20 | 天津凯发电气股份有限公司 | A kind of equipment for protecting optical fibre longitudinal difference and method of data synchronization |
| CN107276053B (en) * | 2017-07-13 | 2019-09-20 | 天津凯发电气股份有限公司 | A kind of equipment for protecting optical fibre longitudinal difference and method of data synchronization |
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