CN108259118B - Auxiliary management control device and method for WDM PON system - Google Patents
Auxiliary management control device and method for WDM PON system Download PDFInfo
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- CN108259118B CN108259118B CN201810032184.8A CN201810032184A CN108259118B CN 108259118 B CN108259118 B CN 108259118B CN 201810032184 A CN201810032184 A CN 201810032184A CN 108259118 B CN108259118 B CN 108259118B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
- H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0254—Optical medium access
- H04J14/0256—Optical medium access at the optical channel layer
- H04J14/0257—Wavelength assignment algorithms
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0254—Optical medium access
- H04J14/0267—Optical signaling or routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0254—Optical medium access
- H04J14/0272—Transmission of OAMP information
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Abstract
the invention discloses an auxiliary management control device and method for a WDM PON system, and relates to the field of WDM PON. The auxiliary management control device comprises a TDM PON system and the TDM PON systemThe system comprises a TDM OLT and TDM ONUs, wherein the TDM OLT is positioned in the WDM OLT, and the TDM ONUs are positioned in the WDM ONUs; the WDM PON system uses the upstream/downstream wavelength as lambda11/λ12、λ21/λ22… …; the uplink/downlink wavelength used by the TDM PON system is lambdao1/λo2(ii) a The TDM PON system realizes an auxiliary management control channel AMCC of the WDM PON system, controls wavelength, optical power report and fault alarm of the WDM ONU, the wavelength of the WDM PON system is all used for service transparent transmission, and the AMCC channel does not occupy bandwidth of the service transparent transmission of the WDM PON system. The invention manages the high-speed WDM PON through the TDM PON, is easy to realize, has little cost increase and has little influence on the WDM data service.
Description
Technical Field
The invention relates to the field of WDM PON, in particular to an auxiliary management control device and method of a WDM PON system.
background
A WDM PON (Wavelength Division Multiplexing PON, Wavelength Division Multiplexing passive optical network) adopts Wavelength Division Multiplexing as a passive optical network of an access technology. WDM-PON typically assigns each ONU (Optical Network Unit) a pair of wavelengths for upstream and downstream transmission, respectively, thereby providing a fixed virtual point-to-point bidirectional connection of the OLT (Optical line terminal) to each ONU. A plurality of different downstream wavelengths lambda11/λ21/λ31……λn1the Optical Distribution Network (ODN) is a passive Optical distributor which transmits downstream wavelengths to corresponding ONUs, respectively.
The WDM PON system is classified into a Wavelength Routing (WR) mode and a Wavelength Selection (WS) mode. The wavelength selection mode is usually performed by equipment, and the ODN is a power distribution device and transmits all wavelengths to the opposite end without performing wavelength selection; the wavelength routing scheme is generally based on the ODN to determine the transmission direction of a signal corresponding to a wavelength, and only a signal having a predetermined wavelength can pass through the corresponding port.
When using a WDM PON for communication, it is generally necessary to control and manage a system, for example: activation/registration/authorization of the WDM ONU, temperature, voltage, receiving and transmitting optical power of the WDM ONU optical module, alarm of the WDM ONU, and the like. For AMCC (Auxiliary Management Control Channel), one way is to perform transcoding or group data frame implementation, which needs to know the format of the bearer data on one hand, and on the other hand, additional delay is brought by re-transcoding or group frame, which is not beneficial to low-delay service bearer; another way is by using pilot, i.e. loading low frequency management signals on high frequency data carriers, which reduces the signal-to-noise ratio of the optical signals and is not conducive to high speed signal processing, e.g. 25Gbps and higher.
the TDM (Time Division multiplexing) PON system is a 1.25G/2.5G GPON (Gigabit-Capable Passive Optical Network) or an EPON (Ethernet Passive Optical Network) which is common, and through the rapid development of fiber to the home in recent years, the GPON and EPON related chips and modules have the characteristics of low cost and stable technology due to large shipment volume and low speed. How to manage a high-speed WDM PON through a mature technology of the TDM PON is a technical problem to be solved urgently at present.
disclosure of Invention
The present invention is directed to overcome the above-mentioned drawbacks of the prior art, and an object of the present invention is to provide an auxiliary management control apparatus and method for a WDM PON system, which manages a high-speed WDM PON through a TDM PON, is easy to implement, does not increase a large cost, and has a small impact on WDM data traffic.
the invention provides an auxiliary management control device of a WDM PON system, the WDM PON system comprises a WDM OLT and a WDM ONU, the auxiliary management control device comprises a TDM PON system, the TDM PON system comprises a TDM OLT and a TDM ONU, the TDMOLT is positioned in the WDM OLT, the TDM ONU is positioned in the WDM ONU; the WDM PON system uses the upstream/downstream wavelength as lambda11/λ12、λ21/λ22… …; the uplink/downlink wavelength used by the TDM PON system is lambdao1/λo2(ii) a The TDM PON system realizes an auxiliary management control channel AMCC of the WDM PON system, controls wavelength, optical power report and fault alarm of the WDM ONU, the wavelength of the WDM PON system is all used for service transparent transmission, and the AMCC channel does not occupy bandwidth of the service transparent transmission of the WDM PON system.
On the basis of the above technical solution, the wavelength of the TDM PON system is not overlapped with the service wavelength in the WDM PON system as a management wavelength: if the standard wavelength of the TDM PON system is not overlapped with the wavelength of the WDM PON system, the standard wavelength of the TDM PON system is directly used as a management wavelength; if the wavelengths are overlapped, the wavelength of the TDM PON system is migrated to the wavelength which is not overlapped with the WDM PON to be used as a management wavelength, or in the wavelength of the WDM PON system, 2 wavelengths are flexibly distributed to the TDM PON system according to the realization difficulty of the optical splitter.
On the basis of the above technical solution, the downstream wavelength used by the TDM OLT is λo2The downstream wavelengths of WDM device and WDM PON system are superposed onto the same main optical fiber via WDM device, and the downstream signal and data of TDM PON system are sent via broadcast, that is, the optical distributor ODN therein sends the downstream lambda of TDM PON systemo2the signals are sent to each downstream port of the ODN, so that each WDM ONU receives downstream TDM PON signals.
On the basis of the technical scheme, the WDM wavelength division device in the WDM PON system divides the downstream wavelength lambdao2Distributing the wavelength of the downlink data service to a TDM ONUn2Distributing to WDM ONU; uplink service wavelength lambda of TDM ONUo1the signal is a shared wavelength of each WDM ONU, and the WDM wavelength division devices in the WDM PON system will lambdao1signal and uplink traffic wavelength lambdan1Taken together and sent to the ODN.
On the basis of the technical scheme, when the WDM PON system adopts a wavelength selection mode, the ODN of the optical distributor is not changed; when the WDM PON system adopts a wavelength routing mode, the optical distributor ODN carries out wavelength combination and division design to ensure that lambda iso2broadcast to each downstream port while letting λ of each porto1Converge to the upstream port.
On the basis of the technical scheme, the TDM ONU comprises an optical receiving unit, an optical transmitting unit, a PON MAC unit and an MCU processing unit, wherein the MCU processing unit reads optical receiving power, transmitting power and current signals of the WDM ONU and transmits the signals to the WDM OLT through a standard format of an AMCC protocol; the MCU processing unit also receives a control command sent by the WDM OLT through the TDM OLT, and controls the wavelength switching and the power adjustment of the WDM ONU.
On the basis of the technical scheme, the TDM OLT is connected with a main control management unit/CPU of the WDM OLT, the main control management unit/CPU of the WDM OLT reads the state of the WDM ONU through the TDM OLT, and simultaneously controls the optical module of the WDM OLT to send a command to the WDM ONU so as to realize unified coordination management of the WDM OLT and the WDM ONU.
On the basis of the technical scheme, the auxiliary management control channel AMCC controls the state transition of the WDM PON system, and the process is as follows:
Initial state O1:
TDM PON ranging, registration sub-state O1-1: when the WDM ONU is powered on or reactivated for the first time, the TDM PON ranging and registration sub-state O1-1 in the initial state O1 is entered, the transmitter of the WDM ONU is closed, the WDM ONU registers and authorizes the TDM OLT, and the AMCC channel of the WDM PON system is established;
Configuration template learning substate O1-2: the WDM ONU learns the configuration template information from the AMCC channel, compares the wavelength capability and the functional performance of the WDM ONU and the AMCC channel according to the information of the WDM optical module read locally, judges whether the configuration template is available, and enters a serial number state O2-O3 if the configuration template is available; if the configuration template is not available, notifying the WDM OLT through an AMCC channel;
sequence number status O2-O3: when the serial number and the authentication mode of the WDM PON system are consistent with those of the TDM PON system, checking that the serial number and the authentication state of the TDM PON system are normal, and entering an operation state O5; when the serial number and the authentication mode of the WDM PON system are inconsistent with those of the TDM PON system, the serial number discovery and authentication process is completed through the AMCC channel;
Operating state O5: the WDM ONU in the operating state O5 checks whether the receiving part of the WDM device is normal, and if so, enters the downstream wavelength adjusting state O8; after the adjustment of the downlink wavelength is finished, entering an uplink wavelength adjustment state O9; after the adjustment of the uplink and downlink wavelengths is finished, entering a data transmission state and carrying out normal data transmission; during the transmission process, if the loss of the downlink data is found, entering an interrupted downlink synchronization loss state O6;
Discontinuous downlink synchronization loss state O6: the WDM ONU entering the discontinuous downlink synchronization loss state O6 starts a timer TO2, and if the WDM ONU reacquires the downlink signal of the data link before the TO2 is overtime or the synchronization is recovered, the WDM ONU returns TO the running state O5; upon the TO2 timer expiring, the WDM ONU enters the TDM PON ranging in the initial state O1, the registration substate O1-1 or the configuration template learning substate O1-2;
Emergency stop state O7: when the WDM ONU needs to enter an emergency stop state O7, the WDM ONU closes the transmitter of the WDM optical module, but keeps the AMCC channel of the TDM ONU and the receiver of the WDM optical module; after receiving a request for starting the WDM ONU in the state, entering a configuration template learning sub-state O1-2 in an initial state O1;
downstream wavelength adjustment state O8: the WDM ONU adjusts the downlink receiving wavelength to be consistent with the configuration template, the TDM PON system and the WDM PON system adopt different wavelengths, and the AMCC channel normally works when the downlink wavelength is adjusted;
upstream wavelength adjustment state O9: the WDM ONU starts an uplink wavelength adjusting timer TO5, and after the WDM ONU finishes the wavelength adjustment of the WDM ONU optical transmitter, the WDM ONU periodically sends out a wavelength adjustment finishing message through an AMCC channel until the WDMOLT feeds back that the WDM ONU receives the message; if the timer TO5 times out, the configuration template learning substate O1-2 in the initial state O1 is returned; the TDM PON system and the WDM PON system adopt different wavelengths, and the AMCC channel works normally when the uplink wavelength is adjusted.
The invention also provides an auxiliary management control method of the WDM PON system, which comprises the following steps:
the WDM PON system comprises a WDM OLT and a WDM ONU, the TDM PON system comprises a TDM OLT and a TDM ONU, and the WDM OLT is added with a TDM OLT; adding a TDM ONU in the WDM ONU; the WDM PON system uses the upstream/downstream wavelength as lambda11/λ12、λ21/λ22… …; the uplink/downlink wavelength used by the TDM PON system is lambdao1/λo2(ii) a The TDM PON system realizes an auxiliary management control channel AMCC of the WDM PON system, controls the wavelength, the optical power report and the fault alarm of the WDM ONU, the wavelength of the WDM PON system is all used for service transparent transmission, and the AMCC channel does not occupy the WDM PON systemAnd (4) unifying the bandwidth of the transparent transmission service.
On the basis of the technical scheme, the auxiliary management control channel AMCC controls the state transition of the WDM PON system, and the process is as follows:
Initial state O1:
TDM PON ranging, registration sub-state O1-1: when the WDM ONU is powered on or reactivated for the first time, the TDM PON ranging and registration sub-state O1-1 in the initial state O1 is entered, the transmitter of the WDM ONU is closed, the WDM ONU registers and authorizes the TDM OLT, and the AMCC channel of the WDM PON system is established;
Configuration template learning substate O1-2: the WDM ONU learns the configuration template information from the AMCC channel, compares the wavelength capability and the functional performance of the WDM ONU and the AMCC channel according to the information of the WDM optical module read locally, judges whether the configuration template is available, and enters a serial number state O2-O3 if the configuration template is available; if the configuration template is not available, notifying the WDM OLT through an AMCC channel;
Sequence number status O2-O3: when the serial number and the authentication mode of the WDM PON system are consistent with those of the TDM PON system, checking that the serial number and the authentication state of the TDM PON system are normal, and entering an operation state O5; when the serial number and the authentication mode of the WDM PON system are inconsistent with those of the TDM PON system, the serial number discovery and authentication process is completed through the AMCC channel;
Operating state O5: the WDM ONU in the operating state O5 checks whether the receiving part of the WDM device is normal, and if so, enters the downstream wavelength adjusting state O8; after the adjustment of the downlink wavelength is finished, entering an uplink wavelength adjustment state O9; after the adjustment of the uplink and downlink wavelengths is finished, entering a data transmission state and carrying out normal data transmission; during the transmission process, if the loss of the downlink data is found, entering an interrupted downlink synchronization loss state O6;
Discontinuous downlink synchronization loss state O6: the WDM ONU entering the discontinuous downlink synchronization loss state O6 starts a timer TO2, and if the WDM ONU reacquires the downlink signal of the data link before the TO2 is overtime or the synchronization is recovered, the WDM ONU returns TO the running state O5; upon the TO2 timer expiring, the WDM ONU enters the TDM PON ranging in the initial state O1, the registration substate O1-1 or the configuration template learning substate O1-2;
emergency stop state O7: when the WDM ONU needs to enter an emergency stop state O7, the WDM ONU closes the transmitter of the WDM optical module, but keeps the AMCC channel of the TDM ONU and the receiver of the WDM optical module; after receiving a request for starting the WDM ONU in the state, entering a configuration template learning sub-state O1-2 in an initial state O1;
Downstream wavelength adjustment state O8: the WDM ONU adjusts the downlink receiving wavelength to be consistent with the configuration template, the TDM PON system and the WDM PON system adopt different wavelengths, and the AMCC channel normally works when the downlink wavelength is adjusted;
Upstream wavelength adjustment state O9: the WDM ONU starts an uplink wavelength adjusting timer TO5, and after the WDM ONU finishes the wavelength adjustment of the WDM ONU optical transmitter, the WDM ONU periodically sends out a wavelength adjustment finishing message through an AMCC channel until the WDMOLT feeds back that the WDM ONU receives the message; if the timer TO5 times out, the configuration template learning substate O1-2 in the initial state O1 is returned; the TDM PON system and the WDM PON system adopt different wavelengths, and the AMCC channel works normally when the uplink wavelength is adjusted.
Compared with the prior art, the invention has the following advantages:
(1) the auxiliary management control device comprises a TDM PON system, wherein the TDM PON system comprises a TDM OLT and a TDM ONU, the TDM OLT is positioned in the WDM OLT, and the TDM ONU is positioned in the WDM ONU; the WDM PON system uses the upstream/downstream wavelength as lambda11/λ12、λ21/λ22… …; the uplink/downlink wavelength used by the TDM PON system is lambdao1/λo2(ii) a The TDM PON system realizes an auxiliary management control channel AMCC of the WDM PON system, controls wavelength, optical power report and fault alarm of the WDM ONU, all wavelengths of the WDM PON system are used for service transparent transmission, and the AMCC channel does not occupy bandwidth of the service transparent transmission of the WDM PON system. The invention manages the high-speed WDM PON by the mature technology of the TDM PON with low cost and low speed, and the optical receiving unit, the optical sending unit, the PON MAC unit and the MCU processing unit of the TDM ONU can be easily integrated into the optical module of the WDM ONU because the technology of the TDM ONU is mature. In the case of no cost increaseUnder the large condition, the channel management is carried out under the condition of not influencing the full transparent transmission of the data service, such as optical fiber ranging, registration and authentication, power failure alarm and the like.
(2) The invention can be applied to both a Wavelength Routing (WR) mode and a Wavelength Selection (WS) mode, and has the characteristics of small time delay, convenient management and the like.
Drawings
Fig. 1 is a schematic configuration diagram of an auxiliary management control apparatus of a WDM PON system according to an embodiment of the present invention.
fig. 2 is a schematic diagram of a state machine of a WDM ONU when a TDM PON system implements an auxiliary management control channel AMCC of the WDM PON system in the embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
Referring to fig. 1, an embodiment of the present invention provides an auxiliary management control apparatus for a WDM PON system, where the WDM PON system includes a WDM OLT and a WDM ONU, the auxiliary management control apparatus includes a TDM PON system, the TDM PON system includes a TDMOLT and a TDM ONU, the TDM OLT is located in the WDM OLT, and the TDM ONU is located in the WDM ONU; the WDM PON system uses the upstream/downstream wavelength as lambda11/λ12、λ21/λ22… …; the uplink/downlink wavelength used by the TDM PON system is lambdao1/λo2(ii) a The TDM PON system realizes an auxiliary management control channel AMCC of the WDM PON system, controls wavelength, optical power report and fault alarm of the WDM ONU, the wavelength of the WDM PON system is all used for service transparent transmission, and the AMCC channel does not occupy bandwidth of the service transparent transmission of the WDM PON system.
the embodiment of the invention also provides an auxiliary management control method of the WDM PON system, which comprises the following steps:
the WDM PON system comprises a WDM OLT and a WDM ONU, the TDM PON system comprises a TDM OLT and a TDM ONU, and the WDM OLT is added with a TDM OLT; adding a TDM ONU in the WDM ONU; the WDM PON system uses the upstream/downstream wavelength as lambda11/λ12、λ21/λ22… …; the uplink/downlink wavelength used by the TDM PON system is lambdao1/λo2(ii) a The TDM PON system realizes an auxiliary management control channel AMCC of the WDM PON system, controls wavelength, optical power report and fault alarm of the WDM ONU, all wavelengths of the WDM PON system are used for service transparent transmission, and the AMCC channel does not occupy bandwidth of the service transparent transmission of the WDM PON system.
the wavelength of the TDM PON system is used as a management wavelength and is not overlapped with the service wavelength in the WDM PON system: if the standard wavelength of the TDM PON system is not overlapped with the wavelength of the WDM PON system, the standard wavelength of the TDM PON system is directly used as a management wavelength; if the wavelengths are overlapped, the wavelength of the TDM PON system is migrated to the wavelength which is not overlapped with the WDM PON to be used as a management wavelength, or in the wavelength of the WDM PON system, 2 wavelengths are flexibly distributed to the TDM PON system according to the realization difficulty of the optical splitter.
The downstream wavelength used by TDM OLT is lambdao2The downstream wavelengths of WDM device and WDM PON system are superposed onto the same main optical fiber via WDM device, and the downstream signal and data of TDM PON system are sent via broadcast, that is, the optical distributor ODN therein sends the downstream lambda of TDM PON systemo2The signals are sent to each downstream port of the ODN, so that each WDM ONU receives downstream TDM PON signals.
WDM wavelength division device in WDM PON system to convert downstream wavelength lambdao2distributing the wavelength of the downlink data service to a TDM ONUn2Distributing to WDM ONU; uplink service wavelength lambda of TDM ONUo1The signal is a shared wavelength of each WDM ONU, and the WDM wavelength division devices in the WDM PON system will lambdao1signal and uplink traffic wavelength lambdan1Taken together and sent to the ODN.
when the WDM PON system adopts a wavelength selection mode, the ODN of the optical distributor is not changed; when the WDM PON system adopts a wavelength routing mode, the optical distributor ODN carries out wavelength combination and division design to ensure that lambda iso2Broadcast to each downstream port while letting λ of each porto1converge to the upstream port.
the TDM ONU comprises an optical receiving unit, an optical transmitting unit, a PON MAC unit and an MCU processing unit, wherein the MCU processing unit reads optical receiving power, transmitting power and current signals of the WDM ONU and transmits the signals to the WDM OLT through a standard format of an auxiliary management control channel AMCC protocol; the MCU processing unit also receives a control command sent by the WDM OLT through the TDM OLT, and controls the wavelength switching and the power adjustment of the WDM ONU.
The TDM OLT is connected with a main control management unit/CPU of the WDM OLT, the main control management unit/CPU of the WDM OLT reads the state of the WDM ONU through the TDM OLT, simultaneously controls the optical module of the WDM OLT and sends a command to the WDM ONU, and unified coordination management of the WDM OLT and the WDM ONU is achieved.
Referring to fig. 2, the AMCC controls the state transition of the WDM PON system, and the process is as follows:
Initial state O1:
TDM PON ranging, registration sub-state O1-1: when the WDM ONU is powered on or reactivated for the first time, the TDM PON ranging and registration sub-state O1-1 in the initial state O1 is entered, the transmitter of the WDM ONU is closed, the WDM ONU registers and authorizes the TDM OLT, and the AMCC channel of the WDM PON system is established;
Configuration template learning substate O1-2: the WDM ONU learns the configuration template information from the AMCC channel, compares the wavelength capability and the functional performance of the WDM ONU and the AMCC channel according to the information of the WDM optical module read locally, judges whether the configuration template is available, and enters a serial number state O2-O3 if the configuration template is available; if the configuration template is not available, notifying the WDM OLT through an AMCC channel;
sequence number status O2-O3: when the serial number and the authentication mode of the WDM PON system are consistent with those of the TDM PON system, checking that the serial number and the authentication state of the TDM PON system are normal, and entering an operation state O5; when the serial number and the authentication mode of the WDM PON system are inconsistent with those of the TDM PON system, the serial number discovery and authentication process is completed through the AMCC channel;
operating state O5: the WDM ONU in the operating state O5 checks whether the receiving part of the WDM device is normal, and if so, enters the downstream wavelength adjusting state O8; after the adjustment of the downlink wavelength is finished, entering an uplink wavelength adjustment state O9; after the adjustment of the uplink and downlink wavelengths is finished, entering a data transmission state and carrying out normal data transmission; during the transmission process, if the loss of the downlink data is found, entering an interrupted downlink synchronization loss state O6;
discontinuous downlink synchronization loss state O6: the WDM ONU entering the discontinuous downlink synchronization loss state O6 starts a timer TO2, and if the WDM ONU reacquires the downlink signal of the data link before the TO2 is overtime or the synchronization is recovered, the WDM ONU returns TO the running state O5; upon the TO2 timer expiring, the WDM ONU enters the TDM PON ranging in the initial state O1, the registration substate O1-1 or the configuration template learning substate O1-2;
Emergency stop state O7: when the WDM ONU needs to enter an emergency stop state O7, the WDM ONU closes the transmitter of the WDM optical module, but keeps the AMCC channel of the TDM ONU and the receiver of the WDM optical module; after receiving a request for starting the WDM ONU in the state, entering a configuration template learning sub-state O1-2 in an initial state O1;
Downstream wavelength adjustment state O8: the WDM ONU adjusts the downlink receiving wavelength to be consistent with the configuration template, the TDM PON system and the WDM PON system adopt different wavelengths, and the AMCC channel normally works when the downlink wavelength is adjusted;
upstream wavelength adjustment state O9: the WDM ONU starts an uplink wavelength adjusting timer TO5, and after the WDM ONU finishes the wavelength adjustment of the WDM ONU optical transmitter, the WDM ONU periodically sends out a wavelength adjustment finishing message through an AMCC channel until the WDMOLT feeds back that the WDM ONU receives the message; if the timer TO5 times out, the configuration template learning substate O1-2 in the initial state O1 is returned; the TDM PON system and the WDM PON system adopt different wavelengths, and the AMCC channel works normally when the uplink wavelength is adjusted.
In the embodiment of the invention, the use of the WDM OLT state machine migration management channel using the TDM PON system as the management channel is basically similar to that of the ONU, and the difference is that the module managed by the main control management unit/CPU is an optical module array.
The mechanism of the state machine in the embodiment of the invention only protects the coordination of the TWDM PON AMCC channel and the WDM PON data channel in the state machine migration, and other known state machine migrations are not in the protection range.
Various modifications and variations of the embodiments of the present invention may be made by those skilled in the art, and they are also within the scope of the present invention, provided they are within the scope of the claims of the present invention and their equivalents.
What is not described in detail in the specification is prior art that is well known to those skilled in the art.
Claims (10)
1. An auxiliary management control device for a WDM PON system including a WDM OLT and WDM ONUs, characterized in that: the auxiliary management control device comprises a TDM PON system, wherein the TDM PON system comprises a TDM OLT and a TDM ONU, the TDMOLT is positioned in the WDM OLT, and the TDM ONU is positioned in the WDM ONU; the WDM PON system uses the upstream/downstream wavelength as lambda11/λ12、λ21/λ22… …; the uplink/downlink wavelength used by the TDM PON system is lambdao1/λo2(ii) a The TDM PON system realizes an auxiliary management control channel AMCC of the WDM PON system, controls wavelength, optical power report and fault alarm of the WDM ONU, the wavelength of the WDM PON system is all used for service transparent transmission, and the AMCC channel does not occupy bandwidth of the service transparent transmission of the WDM PON system.
2. an auxiliary management control apparatus of a WDM PON system according to claim 1, wherein: the wavelength of the TDM PON system is used as a management wavelength and is not overlapped with the service wavelength in the WDM PON system: if the standard wavelength of the TDM PON system is not overlapped with the wavelength of the WDM PON system, the standard wavelength of the TDM PON system is directly used as a management wavelength; if the wavelengths are overlapped, the wavelength of the TDM PON system is migrated to the wavelength which is not overlapped with the WDM PON system to be used as a management wavelength, or in the wavelength of the WDMPON system, 2 wavelengths are flexibly allocated to the TDM PON system to be used according to the realization difficulty of the optical splitter.
3. An auxiliary management control apparatus of a WDM PON system according to claim 1, wherein: the downlink wavelength used by the TDM OLT is lambdao2The downstream wavelengths of WDM device and WDM PON system are superposed onto the same trunk optical fiber by WDM device, the downstream signal and data of TDM PON system are sent by broadcast,that is, the optical distributor ODN transmits the downlink lambda of the TDMPON systemo2The signals are sent to each downstream port of the ODN, so that each WDM ONU receives downstream TDM PON signals.
4. an auxiliary management control apparatus of a WDM PON system according to claim 1, wherein: WDM wavelength division device in WDM PON system sends downstream wavelength lambdao2Distributing the wavelength of the downlink data service to a TDM ONUn2Distributing to WDM ONU; uplink service wavelength lambda of TDM ONUo1The signal is a shared wavelength of each WDM ONU, and the WDM wavelength division devices in the WDM PON system will lambdao1Signal and uplink traffic wavelength lambdan1taken together and sent to the ODN.
5. An auxiliary management control apparatus of a WDM PON system according to claim 1, wherein: when the WDM PON system adopts a wavelength selection mode, the ODN of the optical distributor is not changed; when the WDM PON system adopts a wavelength routing mode, the optical distributor ODN carries out wavelength combination and division design to ensure that lambda iso2broadcast to each downstream port while letting λ of each porto1converge to the upstream port.
6. an auxiliary management control apparatus of a WDM PON system according to claim 1, wherein: the TDM ONU comprises an optical receiving unit, an optical transmitting unit, a PON MAC unit and an MCU processing unit, wherein the MCU processing unit reads optical receiving power, transmitting power and current signals of the WDM ONU and transmits the signals to the WDM OLT through a standard format of an auxiliary management control channel AMCC protocol; the MCU processing unit also receives a control command sent by the WDM OLT through the TDM OLT, and controls the wavelength switching and the power adjustment of the WDM ONU.
7. an auxiliary management control apparatus of a WDM PON system according to claim 1, wherein: the TDM OLT is connected with a main control management unit/CPU of the WDM OLT, the main control management unit/CPU of the WDM OLT reads the state of the WDM ONU through the TDM OLT, simultaneously controls the optical module of the WDM OLT and sends a command to the WDM ONU, and unified coordination management of the WDM OLT and the WDM ONU is achieved.
8. An auxiliary management control apparatus of a WDM PON system according to claim 1, wherein: the auxiliary management control channel AMCC controls the state transition of the WDM PON system, and the process is as follows:
initial state (O1):
TDM PON ranging, registration substate (O1-1): when the WDM ONU is powered on or reactivated for the first time, the TDM PON ranging and registration sub-state (O1-1) in the initial state (O1) is entered, the transmitter of the WDM ONU is closed, the WDM ONU registers and authorizes the TDM OLT, and the AMCC channel of the WDM PON system is established;
Configuration template learner State (O1-2): the WDM ONU learns the configuration template information from the AMCC channel, compares the wavelength capability and the functional performance of the WDM ONU and the AMCC channel according to the information of the WDM optical module read locally, judges whether the configuration template is available, and enters a serial number state (O2-O3) if the configuration template is available; if the configuration template is not available, informing WDMOLT through an AMCC channel;
Sequence number status (O2-O3): when the serial number and the authentication mode of the WDM PON system are consistent with those of the TDM PON system, checking that the serial number and the authentication state of the TDM PON system are normal, and entering an operation state (O5); when the serial number and the authentication mode of the WDM PON system are inconsistent with those of the TDM PON system, the serial number discovery and authentication process is completed through the AMCC channel;
operating state (O5): the WDM ONU in the running state (O5) checks whether the receiving part of the WDM device is normal, and if so, enters a downstream wavelength adjustment state (O8); after the adjustment of the downlink wavelength is finished, entering an uplink wavelength adjustment state (O9); after the adjustment of the uplink and downlink wavelengths is finished, entering a data transmission state and carrying out normal data transmission; during the transmission process, if the downlink data is found to be lost, entering a discontinuous downlink synchronization loss state (O6);
Discontinuous downlink synchronization loss state (O6): the WDM ONU entering the discontinuous downlink synchronization loss state (O6) starts a first timer (TO2), and if the WDM ONU reacquires a data link downlink signal or recovers synchronization before the first timer (TO2) times out, the WDM ONU returns TO the running state (O5); upon expiration of the first timer (TO2), the WDM ONU enters a TDM PON ranging in an initial state (O1), a registration substate (O1-1), or a configuration template learning substate (O1-2);
Emergency stop state (O7): when the WDM ONU needs to enter an emergency stop state (O7), the WDM ONU closes a transmitter of the WDM optical module, but keeps an AMCC channel of the TDM ONU and a receiver of the WDM optical module; entering a configuration template learning substate (O1-2) in an initial state (O1) upon receiving a request to enable a WDM ONU in this state;
downstream wavelength adjustment state (O8): the WDM ONU adjusts the downlink receiving wavelength to be consistent with the configuration template, the TDM PON system and the WDM PON system adopt different wavelengths, and the AMCC channel normally works when the downlink wavelength is adjusted;
Upstream wavelength adjustment state (O9): the WDM ONU starts a second timer (TO5) for adjusting the uplink wavelength, and after the WDM ONU finishes the wavelength adjustment of the WDM ONU optical transmitter, the WDM ONU periodically sends a wavelength adjustment finishing message through the AMCC channel until the WDM OLT feeds back that the WDM OLT receives the message; if the second timer (TO5) times out, returning TO the configuration template learning substate (O1-2) in the initial state (O1); the TDM PON system and the WDM PON system adopt different wavelengths, and the AMCC channel works normally when the uplink wavelength is adjusted.
9. An auxiliary management control method of a WDM PON system is characterized by comprising the following steps:
The WDM PON system comprises a WDM OLT and a WDM ONU, the TDM PON system comprises a TDM OLT and a TDM ONU, and the WDM OLT is added with a TDM OLT; adding a TDM ONU in the WDM ONU; the WDM PON system uses the upstream/downstream wavelength as lambda11/λ12、λ21/λ22… …; the uplink/downlink wavelength used by the TDM PON system is lambdao1/λo2(ii) a The TDM PON system realizes an auxiliary management control channel AMCC of the WDM PON system, controls wavelength, optical power report and fault alarm of the WDM ONU, the wavelength of the WDM PON system is all used for service transparent transmission, and the AMCC channel does not occupy bandwidth of the service transparent transmission of the WDM PON system.
10. a WDM PON system auxiliary management control method according to claim 9, wherein: the auxiliary management control channel AMCC controls the state transition of the WDM PON system, and the process is as follows:
Initial state (O1):
TDM PON ranging, registration substate (O1-1): when the WDM ONU is powered on or reactivated for the first time, the TDM PON ranging and registration sub-state (O1-1) in the initial state (O1) is entered, the transmitter of the WDM ONU is closed, the WDM ONU registers and authorizes the TDM OLT, and the AMCC channel of the WDM PON system is established;
configuration template learner State (O1-2): the WDM ONU learns the configuration template information from the AMCC channel, compares the wavelength capability and the functional performance of the WDM ONU and the AMCC channel according to the information of the WDM optical module read locally, judges whether the configuration template is available, and enters a serial number state (O2-O3) if the configuration template is available; if the configuration template is not available, informing WDMOLT through an AMCC channel;
sequence number status (O2-O3): when the serial number and the authentication mode of the WDM PON system are consistent with those of the TDM PON system, checking that the serial number and the authentication state of the TDM PON system are normal, and entering an operation state (O5); when the serial number and the authentication mode of the WDM PON system are inconsistent with those of the TDM PON system, the serial number discovery and authentication process is completed through the AMCC channel;
Operating state (O5): the WDM ONU in the running state (O5) checks whether the receiving part of the WDM device is normal, and if so, enters a downstream wavelength adjustment state (O8); after the adjustment of the downlink wavelength is finished, entering an uplink wavelength adjustment state (O9); after the adjustment of the uplink and downlink wavelengths is finished, entering a data transmission state and carrying out normal data transmission; during the transmission process, if the downlink data is found to be lost, entering a discontinuous downlink synchronization loss state (O6);
discontinuous downlink synchronization loss state (O6): the WDM ONU entering the discontinuous downlink synchronization loss state (O6) starts a first timer (TO2), and if the WDM ONU reacquires a data link downlink signal or recovers synchronization before the first timer (TO2) times out, the WDM ONU returns TO the running state (O5); upon expiration of the first timer (TO2), the WDM ONU enters a TDM PON ranging in an initial state (O1), a registration substate (O1-1), or a configuration template learning substate (O1-2);
Emergency stop state (O7): when the WDM ONU needs to enter an emergency stop state (O7), the WDM ONU closes a transmitter of the WDM optical module, but keeps an AMCC channel of the TDM ONU and a receiver of the WDM optical module; entering a configuration template learning substate (O1-2) in an initial state (O1) upon receiving a request to enable a WDM ONU in this state;
Downstream wavelength adjustment state (O8): the WDM ONU adjusts the downlink receiving wavelength to be consistent with the configuration template, the TDM PON system and the WDM PON system adopt different wavelengths, and the AMCC channel normally works when the downlink wavelength is adjusted;
Upstream wavelength adjustment state (O9): the WDM ONU starts a second timer (TO5) for adjusting the uplink wavelength, and after the WDM ONU finishes the wavelength adjustment of the WDM ONU optical transmitter, the WDM ONU periodically sends a wavelength adjustment finishing message through the AMCC channel until the WDM OLT feeds back that the WDM OLT receives the message; if the second timer (TO5) times out, returning TO the configuration template learning substate (O1-2) in the initial state (O1); the TDM PON system and the WDM PON system adopt different wavelengths, and the AMCC channel works normally when the uplink wavelength is adjusted.
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| CN110430006B (en) * | 2019-07-10 | 2020-10-09 | 烽火通信科技股份有限公司 | WDM-PON system and control method thereof |
| EP3917045A1 (en) * | 2020-05-29 | 2021-12-01 | SOLiD Inc. | Optical transceiver and method for automatically setting wavelength thereof |
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| CN117081696A (en) * | 2022-05-09 | 2023-11-17 | 中国电信股份有限公司 | Method and system for synchronizing downlink signals |
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