CN102638735A - Optical node device and business switching method thereof - Google Patents
Optical node device and business switching method thereof Download PDFInfo
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- CN102638735A CN102638735A CN2012101103311A CN201210110331A CN102638735A CN 102638735 A CN102638735 A CN 102638735A CN 2012101103311 A CN2012101103311 A CN 2012101103311A CN 201210110331 A CN201210110331 A CN 201210110331A CN 102638735 A CN102638735 A CN 102638735A
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Abstract
The invention discloses an optical node device and a business switching method thereof, relating to technology of passive optical network optical nodes. The business switching method comprises the steps that: a master CPU (central processing unit) in an optical node device is configured with two active and standby PON (passive optical network) MAC (Media Access Control) tables locally; and when data businesses of the two PON MAC tables are switched, a control unit for data business processing reports an interrupt signal to the master CPU, the master CPU updates the active and standby PON MAC tables according to the interrupt signal so as to realize business switching. The invention further discloses the optical node device which comprises a switching chip, two PON MAC chips, an exchanging chip, the master CPU and the control unit for data business processing. By the technical scheme, the application realizes the switching control of double MAC businesses (including data business and management control business) of an ONU (Optical Network Unit). Furthermore, according to the preferred scheme, the switching time is shortened.
Description
Technical field
The present invention relates to PON (Passive Optical Network, EPON) ONU (Optical Network Unit, optical node) technology, be specifically related to a kind of optical node device and switching services method thereof.
Background technology
Four types optical link protection scheme in the standard of existing ITU-T the PON system has been proposed; Wherein the protection of D class requires ONU to have 2 independently PON (Passive Optical Network; Passive optical-fiber network) mouth, corresponding two PON MAC (Media Access Control, MAC controller) chips and two optical modules; And be registered to respectively on two PON interfaces of OLT (optical line terminal, optical fiber cable termination equipment).Two PON mouths of ONU work in one main one and are equipped with state.ONU should be able to guarantee that main business information with the PON port can backed up in synchronization arrive subsequent use PON port, makes that it is constant that ONU can keep the local service attribute, and need not carry out initial configuration and the service attribute configuration of ONU in the PON mouth protection reversed process.
And how to guarantee ONU professional normally switching in PON mouth protection reversed process, become one of crucial problem of ONUD class protection.
Summary of the invention
Technical problem to be solved by this invention is a kind of optical node device and switching services method thereof to be provided, to realize the control of switching of the two MAC of ONU professional (comprising that data service is professional with management control).
In order to solve the problems of the technologies described above, the invention discloses a kind of switching services method of optical node device, comprising:
Master control CPU (CPU) disposes primary, spare two passive optical-fiber networks (PON) multimedia visit controllers (MAC) tabulation in the optical node device in this locality;
When the data service of two PON MAC was switched, the control unit that is used for the data service processing reported interrupt signal to said master cpu, and master cpu upgrades said primary, spare PON MAC tabulation according to this interrupt signal, to realize switching services.
Preferably, in the said method, said master cpu disposes primary, spare PON MAC tabulation in this locality process is following:
Said master cpu is professional through the management control that exchange chip receives two PON MAC chip transparent transmissions in the said optical node device respectively, and according to receiving that first the professional sequencing of management control that two PON MAC chips send disposes said primary, spare PON MAC tabulation.
Preferably, in the said method, said master cpu refers to through the management control business that exchange chip receives two PON MAC chip transparent transmissions in the said optical node device respectively:
The management control that each PON MAC chip will be received is professional to be transferred to said exchange chip through the MII management channels, and the management control business that said exchange chip will be received again is transparent to said master cpu.
Preferably, in the said method, said master cpu refers to through the management control business that exchange chip receives two PON MAC chip transparent transmissions in the said optical node device respectively:
The managing control information of exchange chip is transferred to said exchange chip through gmii interface in the management control business that each PON MAC chip will be received; With being transferred to said exchange chip through the MII management channels in the management control business of receiving, said exchange chip is transparent to said master cpu with the managing control information of the exchange chip of receiving with to the managing control information of PON MAC chip controls and monitoring again.
Preferably, in the said method, the process that the data service of two PON MAC is switched is following:
The said control unit that is used for the data service processing detects the optical link state of two PON MAC chips; When the optical link state that has only a PON MAC chip was path, the PON MAC chip that it is path that the control switch chip is selected detected optical link state was a data service channel;
When the optical link state of two PON MAC chips was path, the PON MAC chip of control switch chip selective light node apparatus acquiescence was a data service channel.
Preferably, in the said method, the process that the data service of two PON MAC is switched is following::
The said control unit that is used for the data service processing detects the optical link state of two PON MAC chips; When the optical link state that detects two PON MAC chips is path; And receive Client-initiated data service channel selection instruction, then selecting corresponding PON MAC chip according to the data service channel selection instruction of being received is data service channel.
Preferably, the said control unit that is used for the data service processing adopts complicated programmable logic device (CPLD) to realize;
When the signal condition detection module confirms that according to detected PON1Rx_SD and PON2Rx_SD signal the optical link state of two PON MAC chips is path among the said CPLD; If it is effective also to detect the SWITCH_ENA signal; Then detect the state of SOFT_SWITCH signal; State machine according among the said CPLD of the state-driven of detected SOFT_SWITCH signal gets into corresponding state; The switch chip control module is according to the state of said state machine output among the said CPLD, and it is data service channel that the control switch chip is selected corresponding PON MAC chip.
The invention also discloses a kind of optical node device, comprise switch chip, two passive optical-fiber networks (PON) multimedia visit controllers (MAC) chip, exchange chip, master control CPU (CPU) and be used for the control unit that data service is handled, wherein:
Said PON MAC chip sends to said exchange chip respectively with the management control business of receiving separately;
Said exchange chip is transparent to said master cpu with the management control business of being received;
The said control unit that is used for the data service processing is realized that through said switch chip the data service of two PONMAC is switched, and when the data service of two PON MAC is switched, is reported interrupt signal to said master cpu;
Said master cpu disposes primary, spare PON MAC tabulation in this locality, and when receiving the interrupt signal that the said control unit that is used for the data service processing reports, upgrades said primary, spare PON MAC tabulation according to this interrupt signal, to realize switching services.
Preferably; In the said apparatus; Said master cpu is professional through the management control that said exchange chip receives two PON MAC chip transparent transmissions in the said optical node device respectively, and according to receiving that first the professional sequencing of management control that two PON MAC chips send disposes said primary, spare PON MAC tabulation.
Preferably, in the said apparatus, said PON MAC chip is transferred to said exchange chip with the management control business of receiving through the MII management channels; Perhaps
The managing control information of exchange chip in the management control business of receiving is transferred to said exchange chip through gmii interface, with being transferred to said exchange chip through the MII management channels in the management control business of receiving.
Preferably; In the said apparatus, the said control unit that data service is handled, the optical link state of two PONMAC chips of detection of being used for; When the optical link state that has only a PON MAC chip is path; Controlling the said switch chip PON MAC chip that to select detected optical link state be path is data service channel, and when the optical link state of two PON MAC chips was path, the PON MAC chip of controlling said switch chip selective light node apparatus acquiescence was a data service channel.
Preferably; In the said apparatus; The said control unit that is used for the data service processing, the optical link state of two PONMAC chips of detection is when the optical link state that detects two PON MAC chips is path; If also receive Client-initiated data service channel selection instruction, then selecting corresponding PON MAC chip according to the data service channel selection instruction of being received is data service channel.
Preferably, in the said apparatus, the said control unit that is used for the data service processing adopts complicated programmable logic device (CPLD) to realize that said CPLD comprises signal condition detection module, state machine and switch chip control module, wherein:
Said signal condition detection module; Detect PON1Rx_SD and PON2Rx_SD signal; When confirming that according to detected PON1Rx_SD and PON2Rx_SD signal the optical link state of two PON MAC chips is path; Also detect the SWITCH_ENA signal,, then detect the state of SOFT_SWITCH signal if it is effective to detect the SWITCH_ENA signal;
Said state machine gets into corresponding state according to the state-driven of the detected PON1Rx_SD of said signal condition detection module, PON2Rx_SD, SWITCH_ENA and SOFT_SWITCH signal;
Said switch chip control module, according to the state of said state machine output, it is data service channel that the control switch chip is selected corresponding PON MAC chip.
The present techniques scheme adds bottom layer driving control through the corresponding optical link state of the two MAC of monitoring ONU, has realized the control of switching of the two MAC of ONU professional (comprising that data service is professional with management control).In addition, the application's preferred version has also improved switching time, makes switching time less than 2ms, has satisfied the requirement of the optical link D of ONU system class protection service outage duration less than 50ms fully, and the level that in the industry cycle is in a leading position.
Description of drawings
Fig. 1 is an optical node apparatus structure sketch map in the present embodiment;
Fig. 2 is a CPLD basic structure sketch map in the present embodiment;
Fig. 3 is the realization sketch map of signal condition detection module in the present embodiment;
Fig. 4 is a state machine work sketch map in the present embodiment.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, hereinafter will combine accompanying drawing that technical scheme of the present invention is done further explain.Need to prove, under the situation of not conflicting, the combination each other arbitrarily of the application's embodiment and the characteristic among the embodiment.
Embodiment 1
Applicant of the present invention proposes on the basis of existing two MAC ONU; SWITCH capable of using (exchange) chip is transparent to master cpu so that master cpu is monitored the corresponding optical link state of the two MAC of ONU (it is main with state or stand-by state promptly monitoring the corresponding optical link of each MAC) in real time with the management control business of two-way MAC.Like this, when PON mouth generation data service was switched, master cpu can be managed the professional real-time reversion of control.
Based on above-mentioned thought, present embodiment provides a kind of switching services method of optical node device, and the implementation procedure of this method is following:
Master cpu disposes primary, spare PON MAC tabulation in the optical node device in this locality;
When the data service of two PON MAC was switched, the control unit that is used for the data service processing reported interrupt signal to master cpu, and master cpu upgrades above-mentioned primary, spare PON MAC tabulation according to this interrupt signal, to realize switching services.
Wherein, Master cpu disposes primary, spare PON MAC tabulation in this locality process is: master cpu is professional through the management control that exchange chip receives two PON MAC chip transparent transmissions respectively, disposes primary, spare PON MAC tabulation according to the professional sequencing of management control of receiving two PON MAC chips transmissions first and gets final product.That is, before optical node device operate as normal, master cpu is tabulated at the primary, spare PON MAC of local initial configuration according to the sequencing of receiving the management control business that two PON MAC chips send first in the initial configuration process.
And the implementation that the main management control business that will receive separately through the SWITCH chip respectively with PON MAC and subsequent use PON MAC chip is transparent to master cpu has multiple.Present embodiment will come the above-mentioned switching services process of further explain with following two kinds of implementations.
In first kind of implementation, the transmission of management control Business Stream, as shown in fig. 1, master cpu is connected with the SWITCH exchange chip through the MII interface, and two PON MAC chips are connected with the SWITCH exchange chip after adding the PHY chip.The management control that OLT issues is professional to be transparent to master cpu through current main MII management channels with PONMAC chip (being PON1 MAC here); The management of subsequent use PON MAC chip (being PON2 MAC) control simultaneously is professional also to be transparent to master cpu through the MII mouth signal that is connected with it; When the data service of two MAC is switched; The control unit (for example CPLD) that is used for the data service processing can report and interrupt giving master cpu; Master cpu refreshes the professional pairing PON MAC tabulation of current data at once and makes sound to OLT answers message, thereby realizes the professional real-time switching of management control.The advantage of this kind implementation is the management control business that master cpu can be monitored two-way MAC in real time, realizes real-time switching.
In second kind of implementation; Management control is professional through active and standby GMII and two interface transmission of MII with PON MAC chip; Just the managing control information of OLT SWITCH chip in the management control business that PON1 MAC and PON2 MAC issue is delivered to the SWITCH chip through gmii interface, and to the managing control information of PON1 MAC and PON2 MAC control and monitoring respectively the MII interface through separately be transparent to the SWITCH chip through PHY and be transferred to master cpu again.Equally; When the data service of two MAC is switched; Be used for control unit that data service handles and can report and interrupt giving master cpu, master cpu refreshes the professional pairing PON MAC tabulation of current data at once and makes sound to OLT answers message, thereby realizes the professional real-time switching of management control.In this mode, the managing control information of SWITCH chip is delivered to the SWITCH chip through gmii interface, promptly by far-end OLT the state of optical node device SWITCH chip is carried out control and management.Like this, as the state information of the OLT of control end SWITCH chip all fully aware of of any moment, and do not need master cpu to feed back the state of SWITCH chip.That is to say; In this kind mode, master cpu only needs to obtain the state information of current SWITCH chip through the MII interface, and need not the SWITCH chip is carried out control and management; Also need not to OLT feedback message; Promptly alleviated the load of master cpu greatly, also realized simultaneously the professional real-time monitoring of two-way MAC corresponding PON management control has been guaranteed the professional real-time switching of management control.In addition, need to prove, in the above-mentioned professional whole process of switching, the concrete implementation of restricting data switching services not.And a kind of preferred data service switchover mode is provided in the present embodiment, can realize efficiently the switching fast of data service of two PON MAC, thereby satisfy of the requirement of the optical link D of ONU system class protection service outage duration better less than 50ms.Be used for the control unit employing CPLD realization that data service is handled in this optimal way; Thereby CPLD logical resource capable of using is abundant; The variation of support programming language, the advantage that power consumption and cost are low, through programming (for example; Programming with Pascal Language such as VHDL, Verilog HDL) realize the corresponding two paths of data of the two MAC of ONU professional switch control, the CPLD that present embodiment provides is as shown in Figure 2.
CPLD detects the optical link state of two PON MAC chips.When having only the optical link state of a PON MAC chip to be path, the PON MAC chip that it is path that control switch chip (preferably, can select the speed-sensitive switch chip for use) is selected detected optical link state is a data service channel; When the optical link state of two PON MAC chips was path, the PON MAC chip of control switch chip selective light node apparatus acquiescence was a data service channel.But need to prove; When present embodiment is path at the optical link state of two PON MAC chips; The PONMAC chip of giving tacit consent to except the selective light node apparatus is the data service channel, and can also control corresponding PONMAC chip according to user's request is data service channel.Promptly when the optical link state of two PON MAC chips was path, if CPLD also detects Client-initiated data service channel selection instruction, then selecting corresponding PON MAC chip according to the data service channel selection instruction of being received was data service channel.
Particularly, data traffic flow shown in Figure 2 to switch control procedure following:
Step 100, the signal condition detection module detects PON1Rx_SD, and the signal condition of PON2Rx_SD, SWITCH_ENA and SOFT_SWITCH is according to the different conditions driving condition machine of each signal;
In this step, the signal condition detection module is mainly monitored the receiver signal index signal PON2Rx_SD of the corresponding optical module of the two MAC of ONU, the level of PON1Rx_SD.It is the signal condition detection module is mainly confirmed the corresponding optical module of two MAC according to the level of PON2Rx_SD and PON1Rx_SD signal optical link state.Also can monitor simultaneously data that master cpu sees off and switch and allow signal SWITCH_ENA, and data service switches control signal SOFT_SWITCH, and initiate to drive to state machine according to the situation of signal level.Promptly when the level that detects PON2Rx_SD and PON1Rx_SD signal confirms that the optical link state of the corresponding optical module of two MAC is path; Detect the SWITCH_ENA signal and confirm whether the user has initiated the data service channel selection instruction; Effectively represent the user when the SWITCH_ENA signal and initiated the data service channel selection instruction, detect the SOFT_SWITCH signal again and confirm that which PON MAC the user has selected as data service channel.
The signal condition detection module mainly can realize through comparator, and is as shown in Figure 3, and purpose is to prevent that these four signals from receiving external disturbance or CPU malfunction and make the state machine redirect that makes a mistake, thereby causes the mistake of system business to be switched.Because being stable high-low levels, PON1Rx_SD under the normal condition, PON2Rx_SD, SWITCH_ENA and SOFT_SWITCH change; The variation of rapid Continuous can not occur, therefore earlier each signal carried out three grades of buffer memorys, whether the data that compare in three grades of buffer memorys through comparator then are consistent with primary data; If consistently be comparator after relatively true value is 1 that the level that each signal is described is stable, can carry out state machine operation; If it is inconsistent; Explain that continuous saltus step has taken place signal level, the motor-driven work of illegal state has effectively been avoided the wrong redirect of state machine.
Also introduce the clock CLK of a 1ms here; Because signal PON1Rx_SD; PON2Rx_SD, the rising edge time of SWITCH_ENA and SOFT_SWITCH be the microsecond level other, possibly be the soonest nanosecond other; Disconnected for avoiding signal that erroneous judgement takes place when rising edge or the trailing edge saltus step, therefore selected the clock of a Millisecond for use.
CLK is also as the work clock of state machine simultaneously, and promptly every 1ms state machine all can move according to the detected signal condition of signal detection module.
Step 200, state machine gets into corresponding state according to the driving of signal condition detection module;
In the above-mentioned steps, the work sketch map of state machine is as shown in Figure 4, the concrete realization as follows:
Behind system's power-up initializing, PON2Rx_SD, PON1Rx_SD state are 11, and promptly two of ONU optical modules do not receive light signal, and the service channel of ONU is defaulted as PON1 (output state that is state machine is that PON1 is the main data channel of using);
PON2Rx_SD; The PON1Rx_SD state jumps to 01 from 11; Promptly this moment ONU optical module PON2 receive light signal (the optical link state that is the PON2MAC chip is a path) earlier, data service channel auto switching (be the output state of state machine jump to PON2 be the main data service channel of using) to the corresponding optical link of PON2;
If this moment, the PON2 optical link broke off, promptly 01 state becomes 11, and the service channel resuming default is PON1 (output state that is state machine is that PON1 is the main data service channel of using);
PON2Rx_SD; The PON1Rx_SD state jumps to 10 from 11; Promptly the optical module PON1 of ONU receives light signal (the optical link state that is PON1 MAC chip is a path) earlier at this moment; The service channel auto switching is to the corresponding optical link of PON1, and is promptly main with data service channel remain unchanged (output state that is state machine is constant); If this moment, the PON1 optical link broke off, promptly 10 states become 11, and the service channel acquiescence still is PON1 (be the output state of state machine remain PON1 be the main data service channel of using);
PON2Rx_SD; The PON1Rx_SD state jumps to 00 from 01; Be ONU PON2 be registered to OLT on after; Other one road PON1 registers connect (promptly the optical link state of two PON MAC chips is path) again, and data service channel should remain unchanged, and still is its previous state PON2 (output state that is state machine is that PON2 is the main data service channel of using);
If this moment, the optical link of PON1 broke off; Be that state becomes 01 again by 00; Because of the current data service channel is PON2, so do not influence current business, the main data service channel that uses still is PON2 (be the output state of state machine remain PON2 lead to use data service channel);
If this moment, the optical link of PON2 broke off, promptly state becomes 10 again by 00, and data service channel can be gone up (be the output state of state machine jump to PON1 be the main data service channel of using) by PON2 auto switching PON1;
PON2Rx_SD; The PON1Rx_SD state jumps to 00 from 10; The PON1 that is ONU is after being registered on the OLT; Other one road PON2 registers and connects, and data service channel should remain unchanged, and still is its previous state PON1 (output state that is state machine is that PON1 is the main data service channel of using);
If this moment, the optical link of PON2 broke off; Be that state becomes 10 again by 00; Because of the current data service channel is PON1, so do not influence current business, data service channel still is PON1 (be the output state of state machine remain PON1 be the main data service channel of using);
If this moment, the optical link of PON1 broke off, promptly state becomes 01 again by 00, and data service channel can be gone up (be the output state of state machine jump to PON2 be the main data service channel of using) by PON1 auto switching PON2;
Work as PON2Rx_SD; The PON1Rx_SD state is 00 o'clock; Two optical link PON1 of ONU were registered to OLT with PON2 and went up (promptly the optical link state of two PON MAC chips is path) this moment, and data service channel possibly be PON1 at this moment, also possibly be PON2; The service channel of ONU allows to carry out software control and switches, and promptly the user can carry out data service channel user selection operation according to demand.Particularly, the user will carry out business datum passage user when selecting, SWITCH_ENA is enabled (promptly control SWITCH_ENA signal for effectively), again by user's drive signal SOFT_SWITCH to carry out the data service switching controls.For example; The level that the user drives the SOFT_SWITCH signal is 1; Then service channel switches to PON1, and promptly current business is PON1, data service channel remain unchanged (output state that is state machine is that PON1 is the main data service channel of using); If current business is PON2, the service after switching passage is PON1 (is the output state of state machine jump to PON1 be the main data service channel of using).The level that the user drives the SOFT_SWITCH signal is 0; Then service channel switches to PON2; If promptly current business is PON2; Data service channel remains unchanged (output state that is state machine is that PON2 is the main data service channel of use), if current business is PON1, switches the back data service channel and be PON2 (be the output state of state machine jump to PON2 be the main data service channel of using).That is to say through above process and realized switching arbitrarily of two service channels.
In addition, state machine can also be controlled the current service channel of outside service indicator light indication according to the difference of service channel, the convenient optical link of confirming professional place ONU.
Step 300, switch chip control module be according to the different conditions of state machine output, and correspondence goes to control that the high speed hilted broadsword is two puts switch chip, if the switch chip control module is output as 0, the GMII data service channel is given tacit consent to and walked PON1 MAC chip; If be 1, the GMII data service channel can be switched on the PON2 MAC chip by switch chip.
Wherein, Controling all by the CPLD logic control of switch chip realize, from PON2Rx_SD, and PON1Rx_SD; The level of SWITCH_ENA and the SOFT_SWITCH state monitoring signal module that changes; The response of state machine action and switch chip control module, required time is 1 clock cycle, promptly the response process time of whole system is merely a clock cycle 1ms.In addition; Time of delay and the signal of signal through the CPLD internal logic is the time frame of nanosecond through the propagation delay time of chip internal; Two operate time and the signal transmission delays of putting switch chip of high speed hilted broadsword also are other time of nanosecond; 1ms adds signal transmission delay time and device operate time, realizes finally that the two MAC data services of ONU are only switched need satisfy telecom operators fully optical link D class is protected the requirement of service outage duration less than 50ms less than the time of 2ms; And the level that in the industry cycle is in a leading position has effectively guaranteed the reliability that operator communicates by letter.
Present embodiment is introduced a kind of optical node device, and this device as shown in Figure 1 comprises two PONMAC passages at least, is used for control unit, switch chip SWITCH chip and master cpu that data service is handled.Wherein, each PON MAC passage is made up of the optical module, PON MAC, PHY chip and the transformer that connect successively, and PON MAC links to each other with transformer through the MII interface.Optical module in two PON MAC passages all be used for the control unit that data service handles and link to each other, transformer all with the SWITCH chip, PON MAC all links to each other with switch chip through gmii interface.Master cpu is connected with the SWITCH exchange chip through the MII interface.Master cpu also links to each other with switch chip through the control unit that is used for the data service processing.Switch chip also links to each other with the SWITCH chip through gmii interface.
PON MAC chip, the management that mainly will receive separately control business sends to the SWITCH chip respectively;
The SWITCH chip mainly is transparent to master cpu with the management control business of being received;
Be used for the control unit that data service is handled, mainly switch, and when the data service of two PON MAC is switched, report interrupt signal to master cpu through the data service of two PON MAC of switch chip realization;
Master cpu disposes primary, spare PON MAC tabulation in this locality, and upgrades local primary, spare PON MAC tabulation according to this interrupt signal, to realize switching services when being used for interrupt signal that control unit that data service handles reports receiving.
Above-mentioned master cpu is before optical node device operate as normal, controls the professional sequencing that arrives master cpu first according to the management of two PON MAC and comes the primary, spare PON MAC of initial configuration to tabulate.
Wherein, The management control business that issues from OLT is transferred to SWITCH chip with the in-band communications mode through the GMII data service channel of current PON MAC chip (being PON1 MAC) here; The SWITCH chip passes through master cpu again; When data service was switched, the management of PON2 MAC control business was switched simultaneously, and is professional to the SWITCH chip through the defeated management control of the GMII oral instructions that are connected with PON2 MAC; The SWITCH chip passes through master cpu again, and the advantage of this kind mode is not take the master cpu resource.
Perhaps; The management control business that OLT issues can be transparent to master cpu through current main MII management channels with PON MAC chip (being PON1 MAC here); The message of the management of subsequent use PON MAC chip (being PON2 MAC) control simultaneously also is transparent to master cpu through the MII mouth signal that is connected with it; When the data service of two MAC is switched; Be used for control unit that data service handles and can report and interrupt giving master cpu, master cpu refreshes the professional pairing PON MAC tabulation of current data at once and makes sound to OLT answers message, thereby realizes the professional real-time switching of management control.
In addition; Management control is professional also can be through active and standby GMII and two interface transmission of MII with PON MAC chip; For example; The managing control information of SWITCH chip all is transparent to the SWITCH chip through gmii interface and is transferred to master cpu again in the management control business that PON1 MAC and PON2 MAC receive, and in the management control business that PON1MAC and PON2MAC receive to the managing control information (i.e. other managing control informations except the managing control information of SWITCH chip) of PONMAC control and monitoring respectively the MII interface through separately be transparent to the SWITCH chip through PHY and be transferred to master cpu again.Like this; When the data service of two MAC is switched; Be used for control unit that data service handles and can report and interrupt giving master cpu, master cpu refreshes the professional pairing PON MAC tabulation of current data at once and makes sound to OLT answers message, thereby realizes the professional real-time switching of management control.
And in the present embodiment, the above-mentioned control unit that is used for the data service processing adopts CPLD to realize.Introduce the implementation of CPLD in the optical node device below in conjunction with accompanying drawing, but need to prove that the realization of CPLD is not limited to this kind mode in the practical application.The CPLD framework that provides in the present embodiment is as shown in Figure 2, comprises signal condition detection module, state machine and switch chip control module at least.
The signal condition detection module; The receiver signal index signal PON2Rx_SD of the corresponding optical module of the two MAC of main monitoring ONU; The level of PON1Rx_SD, promptly the signal condition detection module is mainly confirmed the optical link state of the corresponding optical module of two MAC according to the level of PON2Rx_SD and PON1Rx_SD signal.Also can monitor simultaneously data that master cpu sees off and switch and allow signal SWITCH_ENA, and data service switches control signal SOFT_SWITCH, and initiate to drive to state machine according to the situation of signal level.Promptly when the level that detects PON2Rx_SD and PON1Rx_SD signal confirms that the optical link state of the corresponding optical module of two MAC is path; Detect the SWITCH_ENA signal and confirm whether the user has initiated the data service channel selection instruction; Effectively represent the user when the SWITCH_ENA signal and initiated the data service channel selection instruction; Detect the SOFT_SWITCH signal again and confirm that which PON MAC the user has selected as data service channel, thereby come the state of driving condition machine.
This module can realize through comparator, and purpose is for preventing that these four key signals from receiving external disturbance or CPU malfunction and making the state machine redirect that makes a mistake, thereby causes the mistake of system business to be switched.Because being stable high-low levels, PON1Rx_SD under the normal condition, PON2Rx_SD, SWITCH_ENA and SOFT_SWITCH change; The variation of rapid Continuous can not occur, therefore earlier each signal carried out three grades of buffer memorys, whether the data that compare in three grades of buffer memorys through comparator then are consistent with primary data; If consistently be comparator after relatively true value is 1 that the level that each signal is described is stable, can carry out state machine operation; If it is inconsistent; Explain that continuous saltus step has taken place signal level, the motor-driven work of illegal state has effectively been avoided the wrong redirect of state machine.Particularly, the implementation of signal condition detection module is as shown in Figure 3.
Wherein, Introduced the clock CLK of a 1ms, since signal PON1Rx_SD, PON2Rx_SD; The rising edge time of SWITCH_ENA and SOFT_SWITCH be the microsecond level other; Possibly be the soonest nanosecond other, disconnected for avoiding signal that erroneous judgement takes place when rising edge or the trailing edge saltus step, therefore selected the clock of a Millisecond for use.
CLK is also as the work clock of state machine simultaneously, and promptly every 1ms state machine all can move according to the detected signal condition of signal detection module.
State machine, mainly the driving according to the signal condition detection module gets into corresponding state.
And the concrete course of work of state machine is as shown in Figure 4:
Behind system's power-up initializing, PON2Rx_SD, PON1Rx_SD state are 11, and promptly two of ONU optical modules do not receive light signal, and the service channel of ONU is defaulted as PON1 (output state that is state machine is that PON1 is the main data service channel of using);
PON2Rx_SD; The PON1Rx_SD state jumps to 01 from 11; Promptly this moment ONU optical module PON2 receive light signal earlier, data service channel auto switching (be the output state of state machine jump to PON2 be the main data service channel of using) to the corresponding optical link of PON2;
If this moment, the PON2 optical link broke off, promptly 01 state becomes 11, and the data service channel resuming default is PON1 (output state that is state machine is that PON1 is the main data service channel of using);
PON2Rx_SD, PON1Rx_SD state jump to 10 from 11, promptly this moment ONU optical module PON1 receive light signal earlier, the service channel auto switching is to the corresponding optical link of PON1, promptly data service channel remains unchanged; If this moment, the PON1 optical link broke off, promptly 10 states become 11, and the data service channel acquiescence still is PON1 (output state that is state machine is that PON1 is the main data service channel of using);
PON2Rx_SD; The PON1Rx_SD state jumps to 00 from 01; Be ONU PON2 be registered to OLT on after; Other one road PON1 registers and connects, and data service channel should remain unchanged, and still is its previous state PON2 (output state that is state machine is that PON2 is the main data service channel of using);
If this moment, the optical link of PON1 broke off, promptly state becomes 01 again by 00, and because of the current data service channel is PON2, so do not influence current business, service channel still is PON2 (output state that is state machine is that PON2 is the main data service channel of using);
If this moment, the optical link of PON2 broke off, promptly state becomes 10 again by 00, and data service channel can be gone up (be the output state of state machine jump to PON1 be the main data service channel of using) by PON2 auto switching PON1;
PON2Rx_SD; The PON1Rx_SD state jumps to 00 from 10; The PON1 that is ONU is after being registered on the OLT; Other one road PON2 registers and connects, and data service channel should remain unchanged, and still is its previous state PON1 (output state that is state machine is that PON1 is the main data service channel of using);
If this moment, the optical link of PON2 broke off, promptly state becomes 10 again by 00, and because of the current data service channel is PON1, so do not influence current business, data service channel still is PON1 (output state that is state machine is that PON1 is the main data service channel of using);
If this moment, the optical link of PON1 broke off, promptly state becomes 01 again by 00, and data service channel can be gone up (be the output state of state machine jump to PON2 be the main data service channel of using) by PON1 auto switching PON2;
Work as PON2Rx_SD; The PON1Rx_SD state is 00 o'clock; Two optical link PON1 and the PON2 of ONU were registered to OLT and went up (promptly the optical link state of PON MAC chip is path on two) this moment, and this moment, the service channel of ONU allowed to carry out software control switching (being that the user can carry out the data service channel selection according to demand).Particularly, when the user will carry out the data service channel selection operation, SWITCH_ENA is enabled, again by user's drive signal SOFT_SWITCH to carry out the switching controls of data service channel.For example; The level that the user drives the SOFT_SWITCH signal is 1 o'clock; Data service channel switches to PON1, if promptly current business is PON1, and data service channel remain unchanged (output state that is state machine is that PON1 is the main data service channel of using); If current business is PON2, the service after switching passage is PON1 (is the output state of state machine jump to PON1 be the main data service channel of using);
The level that the user drives the SOFT_SWITCH signal is 0; Data service channel switches to PON2; If promptly current business is PON2, data service channel remains unchanged (output state that is state machine is that PON2 is the main data service channel of using), if current business is PON1; Switch the back data service channel and be PON2 (be the output state of state machine jump to PON1 be the main data service channel of using), realized switching arbitrarily of two service channels through above process.
In addition, also according to the difference of service channel, control outside service indicator light is indicated current service channel to state machine, the convenient optical link of confirming professional place ONU.
The switch chip control module, according to the different conditions of state machine output, correspondence goes to control that the high speed hilted broadsword is two puts switch chip, if the switch chip control module is output as 0, the GMII data service channel is given tacit consent to and is walked the PON1MAC chip; If be 1, the GMII data service channel can be switched on the PON2MAC chip by switch chip.
In the present embodiment; Controling all by the CPLD logic control of switch chip realize, from PON2Rx_SD, and PON1Rx_SD; The level of SWITCH_ENA and the SOFT_SWITCH state monitoring signal module that changes; The response of state machine action and switch chip control module, required time is 1 clock cycle, promptly the response process time of whole system is merely a clock cycle 1ms.In addition; Time of delay and the signal of signal through the CPLD internal logic is the time frame of nanosecond through the propagation delay time of chip internal; Two operate time and the signal transmission delays of putting switch chip of high speed hilted broadsword also are other time of nanosecond; 1ms adds signal transmission delay time and device operate time, realizes finally that the two MAC data services of ONU are only switched need satisfy telecom operators fully optical link D class is protected the requirement of service outage duration less than 50ms less than the time of 2ms; And the level that in the industry cycle is in a leading position has effectively guaranteed the reliability that operator communicates by letter.
One of ordinary skill in the art will appreciate that all or part of step in the said method can instruct related hardware to accomplish through program, said program can be stored in the computer-readable recording medium, like read-only memory, disk or CD etc.Alternatively, all or part of step of the foregoing description also can use one or more integrated circuits to realize.Correspondingly, each the module/unit in the foregoing description can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The application is not restricted to the combination of the hardware and software of any particular form.
The above is merely preferred embodiments of the present invention, is not to be used to limit protection scope of the present invention.All within spirit of the present invention and principle, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. the switching services method of an optical node device is characterized in that, this method comprises:
Master control CPU (CPU) disposes primary, spare two passive optical-fiber networks (PON) multimedia visit controllers (MAC) tabulation in the optical node device in this locality;
When the data service of two PON MAC was switched, the control unit that is used for the data service processing reported interrupt signal to said master cpu, and master cpu upgrades said primary, spare PON MAC tabulation according to this interrupt signal, to realize switching services.
2. the method for claim 1 is characterized in that, said master cpu disposes primary, spare PON MAC tabulation in this locality process is following:
Said master cpu is professional through the management control that exchange chip receives two PON MAC chip transparent transmissions in the said optical node device respectively, and according to receiving that first the professional sequencing of management control that two PON MAC chips send disposes said primary, spare PON MAC tabulation.
3. method as claimed in claim 2 is characterized in that, said master cpu refers to through the management control business that exchange chip receives two PON MAC chip transparent transmissions in the said optical node device respectively:
The management control that each PON MAC chip will be received is professional to be transferred to said exchange chip through the MII management channels, and the management control business that said exchange chip will be received again is transparent to said master cpu.
4. method as claimed in claim 2 is characterized in that, said master cpu refers to through the management control business that exchange chip receives two PON MAC chip transparent transmissions in the said optical node device respectively:
The managing control information of exchange chip is transferred to said exchange chip through gmii interface in the management control business that each PON MAC chip will be received; With being transferred to said exchange chip through the MII management channels in the management control business of receiving, said exchange chip is transparent to said master cpu with the managing control information of the exchange chip of receiving with to the managing control information of PON MAC chip controls and monitoring again.
5. like each described method of claim 1 to 4, it is characterized in that the process that the data service of two PON MAC is switched is following:
The said control unit that is used for the data service processing detects the optical link state of two PON MAC chips; When the optical link state that has only a PON MAC chip was path, the PON MAC chip that it is path that the control switch chip is selected detected optical link state was a data service channel;
When the optical link state of two PON MAC chips was path, the PON MAC chip of control switch chip selective light node apparatus acquiescence was a data service channel.
6. like each described method of claim 1 to 4, it is characterized in that the process that the data service of two PON MAC is switched is following::
The said control unit that is used for the data service processing detects the optical link state of two PON MAC chips; When the optical link state that detects two PON MAC chips is path; And receive Client-initiated data service channel selection instruction, then selecting corresponding PON MAC chip according to the data service channel selection instruction of being received is data service channel.
7. method as claimed in claim 6 is characterized in that,
The said control unit that is used for the data service processing adopts complicated programmable logic device (CPLD) to realize;
When the signal condition detection module confirms that according to detected PON1Rx_SD and PON2Rx_SD signal the optical link state of two PON MAC chips is path among the said CPLD; If it is effective also to detect the SWITCH_ENA signal; Then detect the state of SOFT_SWITCH signal; State machine according among the said CPLD of the state-driven of detected SOFT_SWITCH signal gets into corresponding state; The switch chip control module is according to the state of said state machine output among the said CPLD, and it is data service channel that the control switch chip is selected corresponding PON MAC chip.
8. optical node device; Comprise switch chip; It is characterized in that this device also comprises two passive optical-fiber networks (PON) multimedia visit controllers (MAC) chip, exchange chip, master control CPU (CPU) and be used for the control unit that data service is handled, wherein:
Said PON MAC chip sends to said exchange chip respectively with the management control business of receiving separately;
Said exchange chip is transparent to said master cpu with the management control business of being received;
The said control unit that is used for the data service processing is realized that through said switch chip the data service of two PONMAC is switched, and when the data service of two PON MAC is switched, is reported interrupt signal to said master cpu;
Said master cpu disposes primary, spare PON MAC tabulation in this locality, and when receiving the interrupt signal that the said control unit that is used for the data service processing reports, upgrades said primary, spare PON MAC tabulation according to this interrupt signal, to realize switching services.
9. device as claimed in claim 8 is characterized in that,
Said master cpu is professional through the management control that said exchange chip receives two PONMAC chip transparent transmissions in the said optical node device respectively, and according to receiving that first the professional sequencing of management control that two PON MAC chips send disposes said primary, spare PON MAC tabulation.
10. device as claimed in claim 9 is characterized in that,
Said PON MAC chip is transferred to said exchange chip with the management control business of receiving through the MII management channels; Perhaps
The managing control information of exchange chip in the management control business of receiving is transferred to said exchange chip through gmii interface, with being transferred to said exchange chip through the MII management channels in the management control business of receiving.
11. like each described device of claim 8 to 10, it is characterized in that,
The said control unit that is used for the data service processing; Detect the optical link state of two PON MAC chips; When the optical link state that has only a PON MAC chip is path; Controlling the said switch chip PON MAC chip that to select detected optical link state be path is data service channel, and when the optical link state of two PON MAC chips was path, the PON MAC chip of controlling said switch chip selective light node apparatus acquiescence was a data service channel.
12. like each described device of claim 8 to 10, it is characterized in that,
The said control unit that is used for the data service processing; Detect the optical link state of two PON MAC chips; When the optical link state that detects two PON MAC chips is path; If also receive Client-initiated data service channel selection instruction, then selecting corresponding PON MAC chip according to the data service channel selection instruction of being received is data service channel.
13. device as claimed in claim 12 is characterized in that, the said control unit that is used for the data service processing adopts complicated programmable logic device (CPLD) to realize that said CPLD comprises signal condition detection module, state machine and switch chip control module, wherein:
Said signal condition detection module; Detect PON1Rx_SD and PON2Rx_SD signal; When confirming that according to detected PON1Rx_SD and PON2Rx_SD signal the optical link state of two PON MAC chips is path; Also detect the SWITCH_ENA signal,, then detect the state of SOFT_SWITCH signal if it is effective to detect the SWITCH_ENA signal;
Said state machine gets into corresponding state according to the state-driven of the detected PON1Rx_SD of said signal condition detection module, PON2Rx_SD, SWITCH_ENA and SOFT_SWITCH signal;
Said switch chip control module, according to the state of said state machine output, it is data service channel that the control switch chip is selected corresponding PON MAC chip.
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