CN106851439B - Access method and device for multiple optical network units - Google Patents

Abstract

The invention discloses an access method for multiple optical network units (ONUs), comprising: in the upstream direction, according to the bandwidth allocated by each virtual ONU, acquiring the transmission time slot of each virtual ONU, and assembling according to the allocated bandwidth In the downstream direction, when the ONU frame data sent by the OLT is received, and after the downstream frame delimitation, descrambling and FEC decoding, the PLOAM message, Bandwidth information, GEM payload data, and OMCI messages; After processing PLOAM messages and OMCI messages, the MAC information is dynamically updated according to the OLT configuration; Payload data and OMCI messages are processed accordingly. The invention also discloses an access device for multiple ONUs at the same time.

Description

A method and device for accessing multiple optical network units

technical field

The present invention relates to the technical field of passive optical network (PON, Passive Optical Network) access, and in particular, to a method and device for accessing multiple optical network units (ONU, Optical Network Unit).

Background technique

In recent years, with the rapid development of the global access market and the rapid development of full-service operations, the existing PON technical standards have improved in terms of bandwidth requirements, service support capabilities, and performance improvement of access node equipment and supporting equipment. , are facing new upgrade requirements. At present, 10 Gigabit Passive Optical Network (NGPON, N Gigabit-Capable Passive Optical Network) is already in the commercial stage. NGPON includes two standards: NGPON1 and NGPON2; among them, NGPON2 is the next generation technology of optical access network, mainly used to realize The protocol function defined by ITU-T G.989.3; and can provide a bandwidth of 10G for uplink broadcast and 40G for downlink broadcast, and use an optical splitter to realize the connection between an optical line terminal (OLT, Optical LineTerminal) and multiple ONUs. Among them, the topological structure of a typical PON system is defined in the ITU-T G.989.1 protocol, as shown in Figure 1.

In the PON system shown in Figure 1, the ONU, as a user terminal of the PON system, occupies an optical branch; due to the limitation of optical transmission attenuation, the optical branch ratio of each pair of wavelength channels limits the access to the PON system. Number of ONUs. For each ONU user, the bandwidth provided by the PON system should be sufficient relative to the bandwidth requirements of ordinary users. Therefore, some of the bandwidth provided by the PON system may not be fully utilized, resulting in some hardware being idle. This results in a waste of hardware resources of the PON system, and also increases the networking cost of the PON system.

In order to solve the above problems, an existing solution is to place the ONU on a network node closer to the central office, and provide more user network interfaces (UNI, User Networks Interface) on the ONU, and then access more network nodes. user. However, from the perspective of management, these multiple users share the same ONU, and as an OLT management entity, multiple users share one management channel, so the management of users by this method is limited.

SUMMARY OF THE INVENTION

In view of this, the embodiment of the present invention expects to provide a method and device for accessing multiple ONUs, which can implement the access and management of multiple ONUs on the ONU board of an optical branch terminal, which solves the problem in the prior art. The number of ONU access is limited, and when the number of access is small, the bandwidth utilization rate is not high, and the hardware is idle.

In order to achieve the above-mentioned purpose, the technical scheme of the embodiment of the present invention is realized as follows:

An embodiment of the present invention provides a method for accessing multiple ONUs, wherein more than one ONU is virtualized on one ONU board, and each virtual ONU corresponds to a serial number (SN, Serial Number) for identification and a registration identifier Register- The ID is reported to the optical line terminal OLT in the registration stage, obtains the ONU identifier ONU-ID, and maintains a piece of media access control (MAC, Media Access Control) information for the virtual ONU; the method includes:

In the upstream direction, obtain the transmission time slot of each virtual ONU according to the bandwidth allocated by each virtual ONU, and assemble the upstream burst burst data according to the allocated bandwidth, and send the ONU-ID to the OLT in the transmission time slot;

In the downlink direction, when receiving the ONU frame data sent by the OLT, and after the downlink frame delimitation, descrambling and Forward Error Correction (FEC, Forward Error Correction) decoding, the physical layer operation management and maintenance (PLOAM, Physical Layer Operations And Maintenance) message, bandwidth information, GPON encapsulation mode (GEM, GPON Encapsulation Mode) payload data and Optical Network Unit Management and Control Interface (OMCI, ONU Management and Control Interface) message; after processing the PLOAM message and the OMCI message, Dynamically update the MAC information according to the OLT configuration;

In different processing units, each virtual ONU performs corresponding processing on its own PLOAM message, bandwidth information, GEM payload data and OMCI message.

In the above solution, the MAC information includes: ONU-ID of the virtual ONU, configuration identifier Alloc-ID, GEM port identifier Port-ID, equalization delay and key.

In the above scheme, described in different processing units, each virtual ONU carries out corresponding processing to PLOAM message, bandwidth information, GEM payload data and OMCI message belonging to itself, including:

Each virtual ONU filters the PLOAM message and the broadcast PLOAM message sent to the local virtual ONU according to the ONU-ID saved locally, and processes the PLOAM message and the broadcast PLOAM message;

Each virtual ONU filters the bandwidth sent to the local virtual ONU according to the Alloc-ID saved locally, and determines the bandwidth time slot of each virtual ONU according to the corresponding relationship between the Alloc-ID and the ONU-ID;

After the downstream GEM data is delimited, each virtual ONU filters the GEM packets sent to the local virtual ONU according to the Port-ID stored locally;

After deciphering and reorganizing the GEM packet, each virtual ONU filters the OMCI message sent to the local virtual ONU according to the Port-ID saved locally, and processes the OMCI message.

In the above scheme, update the configuration information of the virtual ONU according to the PLOAM message and the broadcast PLOAM message content, and generate the corresponding upstream PLOAM message, and write the upstream PLOAM message that is generated into the buffer queue corresponding to each PLOAM channel, Waiting to send in the allocated time slot.

In the above solution, the multiple ONUs share the downstream receiving port and the upstream transmitting port of the passive optical network PON system, and are registered on the same group of downstream channels and upstream channels of the PON.

An embodiment of the present invention further provides an access device for multiple ONUs, and the device includes:

The configuration module is used to virtualize more than one ONU on an ONU board. Each virtual ONU corresponds to a SN and Register-ID for identification, which is reported to the OLT during the registration phase, obtains the ONU-ID, and assigns the ONU-ID for the virtual ONU. maintain a MAC information;

The upstream processing module is used in the upstream direction to obtain the transmission time slot of each virtual ONU according to the bandwidth allocated by each virtual ONU, and assemble the upstream burst data according to the allocated bandwidth, and carry the ONU-ID in the transmission time slot Send to OLT;

The downlink processing module is used to obtain the PLOAM message, bandwidth information, GEM payload data and OMCI message; After described PLOAM message and OMCI message are processed, dynamically update described MAC information according to described OLT configuration;

The data and message processing module is used in different processing units, and each virtual ONU performs corresponding processing on its own PLOAM message, bandwidth information, GEM payload data and OMCI message.

In the above solution, the MAC information includes: ONU-ID, Alloc-ID, GEMPort-ID, equalization delay and key of the virtual ONU.

In the above scheme, the data and message processing module further includes:

The PLOAM message processing module is used to filter the PLOAM message and the broadcast PLOAM message sent to the local virtual ONU according to the ONU-ID saved locally, and process the PLOAM message and the broadcast PLOAM message;

The bandwidth information analysis module is used to filter the bandwidth sent to the local virtual ONU according to the Alloc-ID saved locally, and determine the bandwidth time slot of each virtual ONU according to the corresponding relationship between the Alloc-ID and the ONU-ID;

The GEM payload data processing module is used to filter the GEM packets sent to the local virtual ONU according to the Port-ID saved locally after the downstream GEM data is delimited;

The OMCI message processing module is used to filter the OMCI message sent to the local virtual ONU according to the Port-ID saved locally, and process the OMCI message after the GEM packet is deciphered and reorganized.

In the above scheme, the PLOAM message processing module is also used to update the configuration information of the virtual ONU according to the PLOAM message and the broadcast PLOAM message content, and generates a corresponding upstream PLOAM message, and the generated upstream PLOAM message is written. into the buffer queue corresponding to each PLOAM channel, waiting to be sent in the allocated time slot.

In the above solution, the multiple ONUs share the downstream receiving port and the upstream transmitting port of the PON system, and are registered on the same group of downstream channels and upstream channels of the PON.

In the method and device for accessing multiple ONUs provided by the embodiments of the present invention, more than one ONU is virtualized on one ONU board, and each virtual ONU corresponds to a SN and a Register-ID for identification, which are reported to the registration stage. The OLT obtains the ONU-ID, and maintains a piece of MAC information for the virtual ONU; in the upstream direction, obtains the transmission time slot of each virtual ONU according to the bandwidth allocated by each virtual ONU, and assembles it into The upstream burst burst data is sent to the OLT with the ONU-ID in the sending time slot; in the downstream direction, when the ONU frame data sent by the OLT is received, and after the downstream frame delimitation, descrambling, and FEC decoding, the data are obtained respectively. PLOAM message, bandwidth information, GEM payload data and OMCI message; After the PLOAM message and OMCI message are processed, dynamically update the MAC information according to the OLT configuration; in different processing units, each virtual ONU belongs to itself The corresponding PLOAM message, bandwidth information, GEM payload data and OMCI message are processed accordingly. In this way, the access function of more ONUs can be implemented on one optical network interface. Compared with the prior art, more ONUs can be accessed under the same optical splitting ratio, so that the bandwidth can be fully utilized. On the basis of not increasing the number of ONU boards, more OLT management entities are provided; moreover, the number of ONU accesses in the NGPON2 network is increased at a small cost of hardware cost, and the networking cost of the entire network is reduced at the same time.

Description of drawings

1 is a schematic diagram of the topology of a typical PON defined by the G.989.1 protocol in the prior art;

FIG. 2 is a schematic flowchart of an implementation of an access method for multiple ONUs according to an embodiment of the present invention;

3 is a schematic diagram of the function and logical relationship of each component module of different processing units according to an embodiment of the present invention;

4 is a schematic diagram of a PLOAM message processing flow diagram after an embodiment of the present invention is expanded;

5 is a schematic diagram of a registration management process flow of an ONU according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a composition structure of an access apparatus of multiple ONUs according to an embodiment of the present invention.

Detailed ways

In order to be able to understand the features and technical contents of the embodiments of the present invention in more detail, the implementation of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference only and are not used to limit the present invention.

As shown in FIG. 2 , the implementation process of the access method for multiple ONUs in the embodiment of the present invention includes the following steps:

Step 200: More than one ONU is virtualized on one ONU board, each virtual ONU corresponds to a SN and a Register-ID for identification, and is reported to the OLT in the registration phase, obtains the ONU-ID, and maintains an ID for the virtual ONU. copies of MAC information;

Here, how to virtualize multiple ONUs specifically belongs to the prior art, and details are not described herein again.

Step 201: In the upstream direction, according to the bandwidth allocated by each virtual ONU, obtain the transmission time slot of each virtual ONU, and assemble the uplink burst burst data according to the allocated bandwidth, and send the ONU-ID in the transmission time slot. to OLT;

Here, the multiple ONUs share the downstream receiving port and the upstream transmitting port of the PON system, and are registered on the same group of downstream channels and upstream channels of the PON.

Here, since the propagation delay and response time of each ONU are the same, they will be allocated to equal balanced delays by the OLT. In this way, from the transmitting side of the ONU, the bandwidth time slots allocated to each ONU do not affect each other, thus It can ensure that the data of each ONU is sent out accurately and without conflict.

Step 202: in the downlink direction, when receiving the ONU frame data sent by the OLT, and after the downlink frame delimitation, descrambling and FEC decoding, obtain PLOAM message, bandwidth information, GEM payload data and OMCI message respectively; After the PLOAM message and the OMCI message are processed, the MAC information is dynamically updated according to the OLT configuration;

Wherein, the MAC information includes: ONU-ID, Alloc-ID, GEM Port-ID, equalization delay and key of the virtual ONU; and the maintenance of the MAC information is to update the MAC information in time.

Step 203: In different processing units, each virtual ONU performs corresponding processing on its own PLOAM message, bandwidth information, GEM payload data and OMCI message.

Here, the different processing units include: a PLOAM message processing module, a bandwidth information analysis module, a GEM payload data processing module, and an OMCI message processing module in the OLT, and the functions and logical relationships of the four constituent modules of the different processing units As shown in Figure 3.

Described in different processing units, each virtual ONU carries out corresponding processing to PLOAM message, bandwidth information, GEM payload data and OMCI message belonging to itself, including:

Each virtual ONU filters the PLOAM message and the broadcast PLOAM message sent to the local virtual ONU according to the ONU-ID saved locally, and processes the PLOAM message and the broadcast PLOAM message;

Each virtual ONU filters the bandwidth sent to the local virtual ONU according to the Alloc-ID saved locally, and determines the bandwidth time slot of each virtual ONU according to the corresponding relationship between the Alloc-ID and the ONU-ID;

Here, how to specifically determine the bandwidth time slot of each virtual ONU according to the corresponding relationship between the Alloc-ID and the ONU-ID belongs to the prior art, and details are not described herein again.

After the downstream GEM data is delimited, each virtual ONU filters the GEM packets sent to the local virtual ONU according to the Port-ID stored locally;

After deciphering and reorganizing the GEM packet, each virtual ONU filters the OMCI message sent to the local virtual ONU according to the Port-ID saved locally, and processes the OMCI message.

Here, in the downstream direction, the NGPON2 system maintains a set of unicast keys and multicast keys for each virtual ONU in the normal working state, and uses the different Register-IDs of the virtual ONUs to generate their own master keys. The procedures specified in the G.989.3 protocol independently generate and update the keys of each virtual ONU.

The key is obtained according to the corresponding relationship between the ONU-ID and the Port-ID; when the GEM packet needs to be decrypted, the data can be decrypted according to the key index (key_index) and the key in the GEM header.

Among them, the key maintained by the NGPON2 system is also applicable to the encryption process of the upstream GEM packet, which will not be repeated here.

The technical solutions of the access methods of multiple ONUs provided by the present invention are further introduced in detail below:

In the embodiment of the present invention, the expanded PLOAM message processing flow is shown in FIG. 4 . The NGPON2 system maintains a broadcast PLOAM message channel, and maintains an independent PLOAM message channel for each successfully registered virtual ONU. In Figure 4, the NGPON2 system divides the independent PLOAM message channel into n sub-channels according to time slots, and each sub-channel corresponds to an ONU-ID; when a valid Assign ONU-ID is received, the NGPON2 system will correspondingly A PLOAM message sub-channel is added; that is, one virtual ONU corresponds to one PLOAM message sub-channel. Here, the effective AssignONU-ID refers to the match between the SN carried in the message and a certain local virtual ONU; in addition, the PLOAM message processing module independently processes the PLOAM messages of each virtual ONU, and responds to the downlink PLOAM message.

When receiving a unicast PLOAM message sent to a virtual ONU, the PLOAM message processing module will update the configuration information of the virtual ONU according to the content of the unicast PLOAM message. The responding upstream PLOAM message is written into the cache queue of the virtual ONU; when the OLT requests to send a PLOAM message, it reads the PLOAM message from the cache queue, and fills the content of the read PLOAM message into the upstream Burst for transmission go out. When the PLOAM sending flag in the bandwidth allocated to the virtual ONU is 1, it indicates that the OLT requests to send a PLOAM message; at the same time, the status of the PLOAM buffer queue in the virtual ONU can also be reported to the OLT through the Ind field in the Burst Header. When receiving the PLOAM message sent by broadcast, the configuration information of all virtual ONUs is updated according to the content of the PLOAM message; finally, the performance of all maintained PLOAM channels is monitored, and the corresponding monitoring information is sent to the OLT through the OMCI channel.

Wherein, each virtual ONU is preset with a corresponding cache queue for storing PLOAM messages.

Here, among all virtual ONUs, the content configured by the downstream broadcast message of one virtual ONU can be shared by other virtual ONUs, and the content configured by the unicast message belongs to a single virtual ONU.

Similar to the processing process of the PLOAM message, the NGPON2 system also provides an OMCI channel for each virtual ONU in a normal working state, and the OMCI channel is distinguished by the default Port-ID of each virtual ONU. Each virtual ONU has a default Port-ID and Alloc-ID equal to the ONU-ID, which are used for OMCI reception and transmission. In the downstream direction, after the GEM decrypts and reorganizes, it filters the OMCI messages sent to the local virtual ONU according to the locally saved default Port-ID, and processes the OMCI messages accordingly; after parsing the content of the OMCI, the configuration of the corresponding virtual ONU is updated information, such as the number of Port-IDs, encryption status, multicast key, etc., and generate the corresponding OMCI data, and then cache the generated OMCI data in the default service container (TCONT, Transmission Containers) of the virtual ONU; After receiving the allocated time slot of the default TCONT, the ONU reads out the OMCI data, encapsulates it into a GEM packet carrying the default Port-ID, and sends it out as the payload of the burst.

When required by the OLT, the monitoring information of the virtual ONU needs to be reported through the OMCI channel; and since the local virtual ONU shares the device and the downlink received data, the monitoring information for the device and the downlink is shared by all ONUs. However, the upstream transmission and PLOAM channels are independently monitored for each virtual ONU and reported to the OLT only when needed. Among them, when the optical module is abnormally powered off, all the virtual ONUs in the local working state will set the power-off alarm (Dying-gasp) bit in the upstream burst Ind field to 1.

Here, the encrypted state information of each Port-ID maintained by the system is obtained through the OMCI channel corresponding to the virtual ONU; when the virtual ONU sends upstream data to the OLT, the upstream data enters the OLT in the form of optical signals.

5 is a schematic diagram of a registration management flow of a virtual ONU according to an embodiment of the present invention, after receiving the broadcast SN bandwidth in the downlink bandwidth map (BWMAP, BandWidth Map), the state of the local virtual ONU starts to be checked, that is, to check whether there is a virtual ONU that is not registered, If it is checked that all virtual ONUs are registered, the broadcast bandwidth is ignored, and only the data and PLOAM bandwidth directly allocated to the virtual ONUs are processed; The received broadcast registration and ranging authorization is only sent to one of the virtual ONUs, ensuring that only one virtual ONU in the local virtual ONU responds to the registration request and reports the corresponding SN during quiettime during each window opening of the OLT. After the virtual ONU receives the assigned ONU-ID, the software system maintains one more copy of the virtual ONU information and adds a PLOAM and OMCI management channel. After the virtual ONU completes the ranging and enters the O5 state, the parsed SN request bandwidth is delivered to another virtual ONU, and the registration process of the other virtual ONU is started. After all virtual ONUs are registered, the bandwidth requested by the SN is no longer resolved.

To implement the above method, an embodiment of the present invention also provides an access device for multiple ONUs. As shown in FIG. 6 , the device includes a configuration module 61, an uplink processing module 62, a downlink processing module 63, and a data and message processing module 64. ;in,

The configuration module 61 is used to virtualize more than one ONU on one ONU board, and each virtual ONU corresponds to a SN and Register-ID for identification, which is reported to the OLT in the registration phase, obtains the ONU-ID, and provides the virtual ONU-ID for the virtual ONU. ONU maintains a MAC information;

The upstream processing module 62 is used for, in the upstream direction, according to the bandwidth allocated by each virtual ONU, obtains the transmission time slot of each virtual ONU, and assembles the upstream burst data according to the allocated bandwidth, and carries the ONU- ID sent to OLT;

The downlink processing module 63 is used for, in the downlink direction, when receiving the ONU frame data sent by the OLT in the uplink processing module 62, and after the downlink frame delimitation, descrambling and FEC decoding, respectively obtains the PLOAM message, the bandwidth Information, GEM payload data and OMCI message; After described PLOAM message and OMCI message are processed, dynamically update described MAC information according to described OLT configuration;

The data and message processing module 64 is used for, in different processing units, each virtual ONU to perform corresponding processing on its own PLOAM message, bandwidth information, GEM payload data and OMCI message.

Wherein, the MAC information includes: ONU-ID, Alloc-ID, GEM Port-ID, equalization delay and key of the virtual ONU.

Here, the data and message processing module 64 further includes the following four submodules: PLOAM message processing module, bandwidth information analysis module, GEM payload data processing module and OMCI message processing module; wherein,

The PLOAM message processing module is used to filter the PLOAM message and the broadcast PLOAM message sent to the local virtual ONU according to the ONU-ID saved locally, and process the PLOAM message and the broadcast PLOAM message;

The bandwidth information analysis module is used to filter the bandwidth sent to the local virtual ONU according to the Alloc-ID saved locally, and determine the bandwidth time slot of each virtual ONU according to the corresponding relationship between the Alloc-ID and the ONU-ID;

The GEM payload data processing module is used to filter the GEM packets sent to the local virtual ONU according to the Port-ID saved locally after the downstream GEM data is delimited;

The OMCI message processing module is used to filter the OMCI message sent to the local virtual ONU according to the Port-ID saved locally, and process the OMCI message after the GEM packet is deciphered and reorganized.

The PLOAM message processing module is further configured to update the configuration information of the virtual ONU according to the content of the PLOAM message and the broadcast PLOAM message, generate a corresponding upstream PLOAM message, and write the generated upstream PLOAM message into each In the buffer queue corresponding to the PLOAM channel, it is waiting to be sent in the allocated time slot.

Here, the multiple ONUs share the downstream receiving port and the upstream transmitting port of the PON system, and are registered on the same group of downstream channels and upstream channels of the PON.

In practical applications, the configuration module 61, the uplink processing module 62, the downlink processing module 63 and the data and message processing module 64 can all be composed of a central processing unit (CPU, Central Processing Unit), a microprocessor (MPU, Micro Processor Unit), Digital Signal Processor (DSP, Digital Signal Processor), or Field Programmable Gate Array (FPGA, Field Programmable Gate Array) etc.

In the embodiment of the present invention, more than one ONU is virtualized on one ONU board, and each virtual ONU corresponds to a SN and a Register-ID for identification, which is reported to the OLT in the registration stage, obtains the ONU-ID, and maintains the virtual ONU. A piece of MAC information; in the upstream direction, according to the bandwidth allocated by each virtual ONU, obtain the transmission time slot of each virtual ONU, and assemble the upstream burst data according to the allocated bandwidth, and send it with the ONU-ID in the transmission time slot To the OLT; in the downlink direction, when receiving the ONU frame data sent by the OLT, and after the downlink frame delimitation, descrambling and FEC decoding, obtain the PLOAM message, bandwidth information, GEM payload data and OMCI message respectively; After the PLOAM message and the OMCI message are processed, the MAC information is dynamically updated according to the OLT configuration; in different processing units, each virtual ONU carries out the PLOAM message, bandwidth information, GEM payload data and the OMCI message belonging to itself. Treat accordingly. In this way, the access function of more ONUs can be implemented on one optical network interface. Compared with the prior art, more ONUs can be accessed under the same optical splitting ratio, so that the bandwidth can be fully utilized. On the basis of not increasing the number of ONU boards, more OLT management entities are provided; moreover, the number of ONU accesses in the NGPON2 network is increased at a small cost of hardware cost, and the networking cost of the entire network is reduced at the same time.

The above are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the within the protection scope of the present invention.

Claims (10)

1. a kind of access method of a plurality of optical network units ONU, it is characterized in that, on an ONU board card, virtual more than one ONU, each virtual ONU corresponds to a copy of serial number SN and registration mark Register-ID for identifying , report to the optical line terminal OLT in the registration phase, obtain the ONU identifier ONU-ID, and maintain a copy of medium access control MAC information for the virtual ONU; the method includes: In the upstream direction, obtain the transmission time slot of each virtual ONU according to the bandwidth allocated by each virtual ONU, and assemble the upstream burst burst data according to the allocated bandwidth, and send the ONU-ID to the OLT in the transmission time slot; In the downstream direction, when the ONU frame data sent by the OLT is received, and after the downstream frame delimitation, descrambling, and FEC decoding of the forward error correction, the physical layer operation management and maintenance PLOAM message, bandwidth information, and GPON encapsulation method are obtained respectively. GEM payload data and optical network unit management control interface OMCI message; After the described PLOAM message and OMCI message are processed, dynamically update described MAC information according to described OLT configuration; In different processing units, each virtual ONU performs corresponding processing on its own PLOAM message, bandwidth information, GEM payload data and OMCI message. 2 . The method according to claim 1 , wherein the MAC information comprises: ONU-ID of the virtual ONU, configuration identifier Alloc-ID, GEM port identifier Port-ID, equalization delay and key. 3 . 3. method according to claim 2, is characterized in that, described in different processing units, each virtual ONU carries out corresponding processing to PLOAM message, bandwidth information, GEM payload data and OMCI message belonging to itself, including: Each virtual ONU filters the PLOAM message and the broadcast PLOAM message sent to the local virtual ONU according to the ONU-ID saved locally, and processes the PLOAM message and the broadcast PLOAM message; Each virtual ONU filters the bandwidth sent to the local virtual ONU according to the Alloc-ID saved locally, and determines the bandwidth time slot of each virtual ONU according to the corresponding relationship between the Alloc-ID and the ONU-ID; After the downstream GEM data is delimited, each virtual ONU filters the GEM packets sent to the local virtual ONU according to the Port-ID stored locally; After deciphering and reorganizing the GEM packet, each virtual ONU filters the OMCI message sent to the local virtual ONU according to the Port-ID saved locally, and processes the OMCI message. 4. The method according to claim 3, wherein the method further comprises: updating the configuration information of the virtual ONU according to the content of the PLOAM message and the broadcast PLOAM message, and generating a corresponding upstream PLOAM message, The generated uplink PLOAM message is written into the buffer queue corresponding to each PLOAM channel, waiting to be sent in the allocated time slot. 5 . The method according to claim 1 , wherein the multiple ONUs share a downstream receiving port and an upstream transmitting port of a passive optical network PON system, and are registered on the same group of downstream channels and upstream channels of the PON. 6 . 6. An access device for multiple ONUs, wherein the device comprises: The configuration module is used to virtualize more than one ONU on an ONU board. Each virtual ONU corresponds to a SN and Register-ID for identification, which is reported to the OLT during the registration phase, obtains the ONU-ID, and assigns the ONU-ID for the virtual ONU. maintain a MAC information; The upstream processing module is used in the upstream direction to obtain the transmission time slot of each virtual ONU according to the bandwidth allocated by each virtual ONU, and assemble the upstream burst data according to the allocated bandwidth, and carry the ONU-ID in the transmission time slot Send to OLT; The downlink processing module is used to obtain the PLOAM message, bandwidth information, GEM payload data and OMCI message; After described PLOAM message and OMCI message are processed, dynamically update described MAC information according to described OLT configuration; The data and message processing module is used in different processing units, and each virtual ONU performs corresponding processing on its own PLOAM message, bandwidth information, GEM payload data and OMCI message. 7. The apparatus according to claim 6, wherein the MAC information comprises: ONU-ID, Alloc-ID, GEM Port-ID, equalization delay and key of the virtual ONU. 8. The device according to claim 7, wherein the data and message processing module further comprises: The PLOAM message processing module is used to filter the PLOAM message and the broadcast PLOAM message sent to the local virtual ONU according to the ONU-ID saved locally, and process the PLOAM message and the broadcast PLOAM message; The bandwidth information analysis module is used to filter the bandwidth sent to the local virtual ONU according to the Alloc-ID saved locally, and determine the bandwidth time slot of each virtual ONU according to the corresponding relationship between the Alloc-ID and the ONU-ID; The GEM payload data processing module is used to filter the GEM packets sent to the local virtual ONU according to the Port-ID saved locally after the downstream GEM data is delimited; The OMCI message processing module is used to filter the OMCI message sent to the local virtual ONU according to the Port-ID saved locally, and process the OMCI message after the GEM packet is deciphered and reorganized. 9. device according to claim 8, is characterized in that, described PLOAM message processing module, is also used for updating the configuration information of described virtual ONU according to described PLOAM message and broadcast PLOAM message content, and produces corresponding upstream PLOAM message, write the generated upstream PLOAM message into the buffer queue corresponding to each PLOAM channel, and wait to be sent in the allocated time slot. 10 . The device according to claim 6 , wherein the multiple ONUs share a downstream receiving port and an upstream sending port of the PON system, and are registered on the same group of downstream channels and upstream channels of the PON. 11 .

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