CN206775661U - The generation system of reset signal in GPON OLT burst receptions - Google Patents

Abstract

A kind of generation system of reset signal in GPON OLT burst receptions is the utility model is related to, including module and digital logic processing module occur for OTL modules, clock and data recovery module, lead code comparison module, special code comparison module, data processing module, reset signal.Using the generation system of reset signal in the GPON OLT burst receptions, realize the generation of the OLT burst reception reset signals independent of OLT MAC chips, allow OLT optical modules accurately burst reception data, substantial amounts of logical resource need not be spent to go to extract the temporal information in communication frame, also without the time for storing each ONU arrival OLT, it the means such as need not more compare by simulation, the RESET signal of OLT burst reception optical module needs is produced by succinct reliable way again, is with a wide range of applications.

Description

The generation system of reset signal in GPON OLT burst receptions

Technical field

It the utility model is related to communication technical field, more particularly to GPON communication technical fields, in particular to a kind of GPON The generation system of reset signal in OLT burst receptions.

Background technology

At present, the target that China " drop take speed-raising " develops as three big Operator Specific Services, with being currently based on GPON (Gigabit-Capable PON, passive multi-plexing light accessing system) or EPON (Ethernet Passive Optical Network, Ethernet passive optical network) FTTH (Fiber To The Home, fiber entering household) technology propulsion, optical fiber enters Family has been increasingly becoming the main flow of broadband access.With 1:16,1:The deployment of 32 PON system, the bandwidth that each household can be got is 30 Between~50M, if to lift user bandwidth, most real method is equipment dilatation and sinks to terminal housing estate or dilatation Some cable resources；Can there are the technical barrier and cost pressure of management, operation because equipment sinks to cell, and lay again New cable resource further relates to the city management problem such as pavement excavation.At this moment PON (Passive Optical Network, Passive optical-fiber network) polymerization remote device can solves the problems, such as the above well, PON polymerization remote devices are exactly to be added in original Have and collect trunking (as shown in Figure 1) between the distal end of circuit and local side.The remote equipment that PON polymerizations are zoomed out is needed to each The burst that individual ONU (Optical Network Unit, optical network unit) is sent is detected, and to complete to happen suddenly to this The normally receiving of signal will accurately hold burst, and into OLT, (Optical Line Terminal, optical fiber cable termination are set It is standby) in time and the punctual reset signal for providing burst reception normally receive OLT optical modules.Inside trunking There is no the logical layer control chip of the XPON systems of standard, also allowing for the generation of the reset signal must enter otherwise OK.

Existing scheme caused by OLT burst reception reset signals has：

1：By extracting the protocol layer information on original communication line, obtain each ONU equipment send data it is specific when Between and record the specific time that each burst enters OLT modules, send in good time to the realization of the reset signals of OLT burst receptions OLT is normally received, and this implementation needs to parse all information in communication in protocol layer, to the memory capacity of logic chip There is very high requirement with disposal ability more, it is as shown in Figure 2 to implement principle.

2：The envelope signal of a frame data is extracted by analog circuit, OLT burst receptions are produced further according to envelope signal RESET signal, speed of this mode due to analog circuit in itself is unhappy and is easily interfered (mainly light reflection), Its dynamic range is also received by simulation and limited, it is impossible to reaches the reception dynamic range of optical module in itself, and analog circuit sheet Body characteristic index is larger by such environmental effects, and the requirement condition to circuit in itself in Practical Project use is excessively harsh, very It is difficult commercial.Its operation principle is as shown in Figure 3.

Utility model content

The purpose of this utility model is the shortcomings that overcoming above-mentioned prior art, there is provided one kind can realize independent of The generation of the OLT burst reception reset signals of OLT MAC chips, allow the accurate burst reception data of OLT optical modules The generation system of reset signal in GPON OLT burst receptions.

To achieve these goals, the utility model has following form：

The generation system of reset signal in the GPON OLT burst receptions, it is characterised in that described system includes OTL moulds Mould occurs for block, clock and data recovery module, lead code comparison module, special code comparison module, data processing module, reset signal Block and digital logic processing module, the first input end of described OTL modules are connected with ONU light sources, described OTL modules Output end is connected with the input of described clock and data recovery module, the first output of described clock and data recovery module End is connected with the input of described data processing module, and the output end of described data processing module is connected with ONU modules Connect, the second output end of described clock and data recovery module is connected with the first input end of described lead code comparison module Connect, the first output end of described lead code comparison module is connected with the input of described special code comparison module, described The output end of special code comparison module be connected with the first input end of described Digital Logic processing module, described is leading Second output end of code comparison module is connected with the second input of described Digital Logic processing module, and described numeral is patrolled The output end for collecting processing module is connected with the input of described reset signal generation module, and mould occurs for described reset signal First output end of block is connected with the second input of described lead code comparison module, and module occurs for described reset signal The second output end be connected with the second input of described OTL modules.

It is preferred that it is high speed recurrent pulse reseting signal generator that module, which occurs, for described reset signal.

More preferably, it is characterised in that the signal of described high speed recurrent pulse reseting signal generator is by Digital Logic control Unit control processed,

Further, the control signal of described Digital Logic control unit is by lead code comparison module and special code ratio Jointly control compared with module

Further, in the intermediate time of high speed recurrent pulse reset signal, lead code comparison module and special code ratio Compared with module corresponding comparison control signal is exported to described Digital Logic control unit.

Further, described control signal clock and data recovery module provides.

Further, described clock and data recovery module is twice in the time interval of cycle reset signal, to OLT The signal of module output carries out Clock Extraction and recovery, is used for follow-up lead code comparison module.

Employ the generation system of reset signal in the GPON OLT burst receptions in the utility model, realize independent of In the generation of the OLT burst reception reset signals of OLT MAC chips, allow OLT optical modules accurately burst reception data, no Need to spend substantial amounts of logical resource to go to extract the temporal information in communication frame, it is not required that store each ONU reach OLT when Between, it the means such as need not more compare by simulation, producing OLT burst reception optical modules by succinct reliable way again needs to use RESET signal, be with a wide range of applications.

Brief description of the drawings

Fig. 1 is that the PON of prior art polymerize the schematic diagram of remote device.

Fig. 2 is a kind of principle schematic of scheme caused by the OLT burst reception reset signals of prior art.

Fig. 3 is the principle schematic of another scheme caused by the OLT burst reception reset signals of prior art.

Fig. 4 is the schematic diagram of the generation system of reset signal in GPON OLT burst receptions of the present utility model.

Fig. 5 is the OLT module drives electricity of the generation system of reset signal in GPON OLT burst receptions of the present utility model Road.

Fig. 6 is the clock and data recovery mould of the generation system of reset signal in GPON OLT burst receptions of the present utility model Block.

Fig. 7 is that the fpga logic of the generation system of reset signal in GPON OLT burst receptions of the present utility model controls mould Block.

Fig. 8 is the biography of the RESET signal of the generation system of reset signal in GPON OLT burst receptions of the present utility model The schematic diagram passed.

Fig. 9 is the signal of the pulse signal of the generation system of reset signal in GPON OLT burst receptions of the present utility model Figure.

Figure 10 is the OLT modules of the generation system of reset signal in GPON OLT burst receptions of the present utility model.

Figure 11 is a kind of embodiment of the generation system of reset signal in GPON OLT burst receptions of the present utility model Schematic diagram.

Figure 12 is the production of the RESET signal of the generation system of reset signal in GPON OLT burst receptions of the present utility model Raw schematic flow sheet.

Figure 13 is that the technique effect of the generation system of reset signal in GPON OLT burst receptions of the present utility model shows It is intended to.

Embodiment

In order to more clearly describe technology contents of the present utility model, enter traveling one with reference to specific embodiment The description of step.

In a kind of specific embodiment, the generation system of reset signal, its feature in the GPON OLT burst receptions It is, described system includes OLT modules, clock and data recovery module, lead code comparison module, special code comparison module, number Module and digital logic processing module, the first input end and ONU of described OLT modules occurs according to processing module, reset signal Light source is connected, and the output end of described OLT modules is connected with the input of described clock and data recovery module, described First output end of clock and data recovery module is connected with the input of described data processing module, described data processing The output end of module is connected with ONU modules, the second output end of described clock and data recovery module and described lead code The first input end of comparison module is connected, and the first output end of described lead code comparison module is compared with described special code The input of module is connected, the output end of described special code comparison module and the first of described Digital Logic processing module Input is connected, and the second of the second output end of described lead code comparison module and described Digital Logic processing module is defeated Enter end to be connected, the input that module occurs with described reset signal for the output end of described Digital Logic processing module is connected Connect, the first output end that module occurs for described reset signal is connected with the second input of described lead code comparison module Connect, the second output end that module occurs for described reset signal is connected with the second input of described OLT modules.

In a kind of preferably embodiment, described reset signal occurs module and sent out for high speed recurrent pulse reset signal Raw device.

In a kind of more preferably embodiment, it is characterised in that described high speed recurrent pulse reseting signal generator Signal is controlled by Digital Logic control unit,

In a kind of further embodiment, the control signal of described Digital Logic control unit is by lead code ratio Jointly control compared with module and special code comparison module

In a kind of further embodiment, in the intermediate time of high speed recurrent pulse reset signal, lead code ratio Compared with module and special code comparison module corresponding comparison control signal is exported to described Digital Logic control unit.

In a kind of further embodiment, described control signal clock and data recovery module provides.

In a kind of further embodiment, described clock and data recovery module is in cycle reset signal twice In time interval, Clock Extraction and recovery are carried out to the signal of OLT modules output, used for follow-up lead code comparison module.

The technical program is added to particular frame preamble detecting mode by cycle reset mode to produce OLT burst reception optical modes Reset signal needed for block, principle of the present utility model are as shown in Figure 4：

The electric signal of OLT optical modules output enters clock and data recovery module, and clock and data recovery module is mainly using prominent Clock Extraction chip is sent out, such chip provides clock by the difference output of high speed and is directed at the resynchronisation data flow of clock, its Acquisition time, bit error rate and jitter toleration are satisfied by GPON PMD code requirements.The data after the completion of data and clock recovery Stream enters " 01 lead code CL Compare Logic ", a signal, this signal are then produced when data and lead code " 0101 " are consistent RESET signal is produced for controlling high speed periodic pulse signal to forbid, otherwise when data are not consistent with lead code " 0101 " A signal is then produced during conjunction to be made high speed recurrent pulse reseting signal generator produce RESET signal and resets OLT modules.Currently " B593 " special code is then carried out again after leading code is relatively correct to compare, and high speed recurrent pulse is then enabled when special code is not met and is resetted Signal generator produces follow-up reset signal, OLT is resetted reception again.The data whether reset signal produces judge and patrolled Processing is collected to complete within 10ns." 0101 " lead code CL Compare Logic and " B593 " special code CL Compare Logic module use FPGA logic gates is realized, speed is performed to improve decision logic.

OLT module drives circuit, should as shown in figure 5, PIN7 pins therein are the reseting pin of burst reception module Pin is produced by logic chip.Clock and data recovery module is as shown in fig. 6, the data exported according to OLT modules export in real time Synchronised clock and the data flow of matching.As shown in fig. 7, fpga logic control module mainly realizes that " 0101 " lead code is relatively patrolled Collect, " B593 " special code CL Compare Logic, high speed recurrent pulse reseting signal generator, Digital Logic processing unit.

As shown in Figure 8 and Figure 9, in the utility model：

Control system periodically produces RESET signal, and OLT optical modules can recover normal number according to RESET signal According to；

The clock and data of high-frequency clock data recovery system rapid extraction bursty data

Data process method detects according to the clock received with data to the special synchronization code word in packet header, and according to detection As a result RESET signal is sent out

Once detecting normal data frame head, system grows automatic detection bag, and controls the output of RESET signal.

In a kind of more specifically embodiment, as shown in Figure 10, the U5 in Figure 10 is OLT modules, is completed descending continuous Signal electro-optic conversion and uplink burst signal opto-electronic conversion, the data flow after up opto-electronic conversion are laggard by impedance matching network Enter U27 clock data Shaping Modules, what U27 designed to aim at the application of 1244Mbps GPON optical transmission lines terminal receiver Burst clock phase localizer, it is ensured that collect signal in first 13 of burst mode.The burst clock data processing mould Block can also use other technologies to complete (such as high speed output technology).

PLD chip is as shown in figure 11 for the embodiment of RESET signal according to caused by system logic, The high speed differential clock and the resynchronisation upstream of alignment clock recovered by special clock extraction chip enters jointly The U5 chips stated, U5 are to realize logic gates in high speed FPGA, FPGA to be used to judge " 0101 " lead code, the utility model Reset signals generation flow it is as shown in figure 12.

The generation system of reset signal in the GPON OLT burst receptions in the utility model is employed, as shown in figure 13, The generation of the OLT burst reception reset signals independent of OLT MAC chips is realized, OLT optical modules is accurately dashed forward Sending/receiving data, it is not necessary to spend substantial amounts of logical resource to go to extract the temporal information in communication frame, it is not required that storage is each ONU reaches OLT time, the means such as need not more compare by simulation, and producing OLT bursts by succinct reliable way again connects The RESET signal of optical module needs is received, be with a wide range of applications (output data that the top half in Figure 13 is OLT, The latter half is OLT RESET signal, is not detecting that qualified data are constantly periodic generation reset signals For resetting OLT, then stop sending RESET signal when detecting qualified data flow until effective data flow knot Beam, then carry out the burst reception of next frame data).

In this description, the utility model is described with reference to its specific embodiment.But it is clear that still can be with Various modification can be adapted and conversion is without departing from spirit and scope of the present utility model.Therefore, specification and drawings are considered as It is illustrative and not restrictive.

Claims (7)

1. the generation system of reset signal in a kind of GPON OLT burst receptions, it is characterised in that described system includes OLT moulds Mould occurs for block, clock and data recovery module, lead code comparison module, special code comparison module, data processing module, reset signal Block and digital logic processing module, the first input end of described OLT modules are connected with ONU light sources, described OLT modules Output end is connected with the input of described clock and data recovery module, the first output of described clock and data recovery module End is connected with the input of described data processing module, and the output end of described data processing module is connected with ONU modules Connect, the second output end of described clock and data recovery module is connected with the first input end of described lead code comparison module Connect, the first output end of described lead code comparison module is connected with the input of described special code comparison module, described The output end of special code comparison module be connected with the first input end of described Digital Logic processing module, described is leading Second output end of code comparison module is connected with the second input of described Digital Logic processing module, and described numeral is patrolled The output end for collecting processing module is connected with the input of described reset signal generation module, and mould occurs for described reset signal First output end of block is connected with the second input of described lead code comparison module, and module occurs for described reset signal The second output end be connected with the second input of described OLT modules.

2. the generation system of reset signal in GPON OLT burst receptions according to claim 1, it is characterised in that described Reset signal occur module be high speed recurrent pulse reseting signal generator.

3. the generation system of reset signal in GPON OLT burst receptions according to claim 2, it is characterised in that described The signal of high speed recurrent pulse reseting signal generator controlled by Digital Logic control unit.

4. the generation system of reset signal in GPON OLT burst receptions according to claim 3, it is characterised in that described The control signal of Digital Logic control unit jointly controlled by lead code comparison module and special code comparison module.

5. the generation system of reset signal in GPON OLT burst receptions according to claim 4, it is characterised in that in height The intermediate time of fast recurrent pulse reset signal, lead code comparison module and special code comparison module are to described Digital Logic control Unit processed exports corresponding comparison control signal.

6. the generation system of reset signal in GPON OLT burst receptions according to claim 5, it is characterised in that described Control signal clock and data recovery module provide.

7. the generation system of reset signal in GPON OLT burst receptions according to claim 6, it is characterised in that described Clock and data recovery module twice in the time interval of cycle reset signal, row clock is entered to the signal of OLT modules output Extraction and recovery, are used for follow-up lead code comparison module.