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

Access method and device for multiple optical network units Download PDF

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CN106851439B
CN106851439B CN201510894093.1A CN201510894093A CN106851439B CN 106851439 B CN106851439 B CN 106851439B CN 201510894093 A CN201510894093 A CN 201510894093A CN 106851439 B CN106851439 B CN 106851439B
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onu
ploam
message
virtual
virtual onu
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CN106851439A (en
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龚鹏
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Sanechips Technology Co Ltd
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Sanechips Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects

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Abstract

The invention discloses an access method of a plurality of Optical Network Units (ONU), which comprises the following steps: in the uplink direction, acquiring the sending time slot of each virtual ONU according to the bandwidth allocated to each virtual ONU, assembling the sending time slot into uplink burst data according to the allocated bandwidth, and sending the uplink burst data to the OLT by carrying the ONU-ID in the sending time slot; in the downlink direction, when ONU frame data sent by the OLT is received and after the downlink frame delimitation, descrambling and FEC decoding, PLOAM information, bandwidth information, GEM payload data and OMCI information are respectively obtained; 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 correspondingly processes the PLOAM message, the bandwidth information, the GEM payload data and the OMCI message which belong to the virtual ONU. The invention also discloses an access device of the plurality of ONUs.

Description

Access method and device for multiple optical network units
Technical Field
The present invention relates to the field of Passive Optical Network (PON) access technologies, and in particular, to an access method and an access device for multiple Optical Network Units (ONU).
Background
In recent years, with the rapid development of the global access market and the rapid development of the full-service operation, the existing PON technical standard faces new upgrading requirements in the aspects of bandwidth requirements, service supporting capability, performance improvement of access node equipment and supporting equipment, and the like. At present, a Gigabit-Capable passive optical Network (NGPON) is already in a commercial stage, and the NGPON includes two standards: NGPON1 and NGPON 2; the NGPON2 is a next-generation technology of an optical access network, and is mainly used for realizing a protocol function defined by ITU-T g.989.3; and can provide bandwidth with 10G uplink broadcast and 40G downlink broadcast, and realize the connection of one Optical Line Terminal (OLT) and a plurality of ONUs by using an Optical splitter. The topology of a typical PON system is defined in ITU-T g.989.1 protocol, as shown in fig. 1.
In the PON system shown in fig. 1, an ONU occupies an optical branch as a user terminal of the PON system; the optical splitting ratio of each pair of wavelength channels limits the number of ONUs accessing the PON system due to limitations of optical transmission attenuation. For each ONU user, the bandwidth provided by the PON system is enough compared with the bandwidth requirement of an ordinary user, so that a part of the bandwidth provided by the PON system may be not fully utilized, resulting in idle of a part of hardware, which causes waste of hardware resources of the PON system and also increases the networking cost of the PON system.
In order to solve the above problem, an existing solution is to place an ONU on a network node closer to the central office, and provide more User Network Interfaces (UNI) on the ONU, so as to access more users. However, from the management aspect, the multiple users share the same ONU, and as one OLT management entity, the multiple users share one management channel, so that the method is limited to manage the users.
Disclosure of Invention
In view of this, embodiments of the present invention are expected to provide an access method and an access device for multiple ONUs, which can implement access and management of multiple ONUs on an ONU board of an optical splitting terminal, and solve the problems in the prior art that the number of ONUs is limited, and when the number of ONUs is small, the bandwidth utilization rate is not high, and hardware is idle.
In order to achieve the above purpose, the technical solution of the embodiment of the present invention is realized as follows:
the embodiment of the invention provides an Access method of a plurality of ONUs, wherein more than one ONU is virtually simulated on an ONU board card, each virtual ONU corresponds to a Serial Number (SN) and a registration identifier Register-ID for identification, and the Serial Number and the registration identifier Register-ID are reported to an Optical Line Terminal (OLT) in a registration stage to obtain the ONU identifier ONU-ID and maintain a Medium Access Control (MAC) message for the virtual ONU; the method comprises the following steps:
in the uplink direction, acquiring the sending time slot of each virtual ONU according to the bandwidth allocated to each virtual ONU, assembling the sending time slot into uplink burst data according to the allocated bandwidth, and sending the uplink burst data to the OLT by carrying the ONU-ID in the sending time slot;
in a downlink direction, when receiving ONU frame data sent by the OLT, And after performing downstream frame delimitation, descrambling, And Forward Error Correction (FEC) decoding, respectively acquiring a Physical Layer operation administration And Maintenance (PLOAM) message, bandwidth information, GPON Encapsulation Mode (GEM) payload data, And an optical network unit Management control Interface (OMCI, ONU Management And control Interface) message; 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 correspondingly processes the PLOAM message, the bandwidth information, the GEM payload data and the OMCI message which belong to the virtual ONU.
In the foregoing scheme, the MAC information includes: ONU-ID, configuration identification Alloc-ID, GEM Port identification Port-ID, equalization delay and secret key of the virtual ONU.
In the above solution, in the different processing units, each virtual ONU performs corresponding processing on its own PLOAM message, bandwidth information, GEM payload data, and OMCI message, including:
each virtual ONU filters out PLOAM messages and broadcast PLOAM messages sent to the local virtual ONU according to the locally stored ONU-ID, and processes the PLOAM messages and the broadcast PLOAM messages;
each virtual ONU filters out the bandwidth sent to the local virtual ONU according to the locally stored Alloc-ID, and determines the bandwidth time slot of each virtual ONU according to the corresponding relation between the Alloc-ID and the ONU-ID;
after the delimitation of the downlink GEM data is finished, filtering out GEM packets sent to the local virtual ONU by each virtual ONU according to a Port-ID stored locally;
after the GEM packet fragments are decrypted and recombined, each virtual ONU filters out OMCI messages sent to the local virtual ONU according to the locally stored Port-ID, and the OMCI messages are processed.
In the above scheme, the configuration information of the virtual ONU is updated according to the content of the PLOAM message and the broadcast PLOAM message, and a corresponding uplink PLOAM message is generated, and the generated uplink PLOAM message is written into the cache queues corresponding to the PLOAM channels, and waits for transmission in the allocated time slot.
In the above scheme, the ONUs share a downstream receiving port and an 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 apparatus for multiple ONUs, where the apparatus includes:
the configuration module is used for virtually simulating more than one ONU on an ONU board card, each virtual ONU corresponds to an SN and a Register-ID used for identification, and the SN and the Register-ID are reported to the OLT in a registration stage, so that the ONU-ID is obtained, and MAC information is maintained for the virtual ONU;
the uplink processing module is used for acquiring the sending time slot of each virtual ONU in the uplink direction according to the bandwidth allocated to each virtual ONU, assembling the sending time slot into uplink burst data according to the allocated bandwidth, and sending the uplink burst data to the OLT by carrying the ONU-ID in the sending time slot;
the downlink processing module is used for respectively acquiring PLOAM information, bandwidth information, GEM payload data and OMCI information after downlink frame delimitation, descrambling and FEC decoding when ONU frame data sent by the OLT in the uplink processing module is received in the downlink direction; after the PLOAM message and the OMCI message are processed, the MAC information is dynamically updated according to the OLT configuration;
and the data and message processing module is used for correspondingly processing the PLOAM message, the bandwidth information, the GEM payload data and the OMCI message which belong to each virtual ONU in different processing units.
In the foregoing scheme, the MAC information includes: ONU-ID, Alloc-ID, GEMPort-ID, equalization delay and key of the virtual ONU.
In the foregoing solution, the data and message processing module further includes:
the PLOAM message processing module is used for filtering PLOAM messages and broadcast PLOAM messages sent to the local virtual ONU according to the locally stored ONU-ID and processing the PLOAM messages and the broadcast PLOAM messages;
the bandwidth information analysis module is used for filtering out the bandwidth sent to the local virtual ONU according to the locally stored Alloc-ID and determining the bandwidth time slot of each virtual ONU according to the corresponding relation between the Alloc-ID and the ONU-ID;
the GEM payload data processing module is used for filtering out GEM packets sent to the local virtual ONU according to a locally stored Port-ID after the delimitation of the downlink GEM data is finished;
and the OMCI message processing module is used for filtering the OMCI message sent to the local virtual ONU according to the locally stored Port-ID after the GEM packet fragments are decrypted and recombined, and processing the OMCI message.
In the foregoing solution, the PLOAM message processing module is further configured to update configuration information of the virtual ONU according to the PLOAM message and broadcast PLOAM message content, generate a corresponding uplink PLOAM message, write the generated uplink PLOAM message into a cache queue corresponding to each PLOAM channel, and wait for sending the message in an allocated time slot.
In the above solution, the plurality of ONUs share the downstream receiving port and the upstream sending port of the PON system, and are registered in the same group of downstream channels and upstream channels of the PON.
The method and the device for accessing the multiple ONUs provided by the embodiment of the invention virtually simulate more than one ONU on one ONU board card, each virtual ONU corresponds to an SN and a Register-ID used for identification, and the SN and the Register-ID are reported to the OLT in a registration stage to obtain the ONU-ID and maintain a piece of MAC information for the virtual ONU; in the uplink direction, acquiring the sending time slot of each virtual ONU according to the bandwidth allocated to each virtual ONU, assembling the sending time slot into uplink burst data according to the allocated bandwidth, and sending the uplink burst data to the OLT by carrying the ONU-ID in the sending time slot; in the downlink direction, when ONU frame data sent by the OLT is received and after downstream frame delimitation, descrambling and FEC decoding, PLOAM information, bandwidth information, GEM payload data and OMCI information are respectively obtained; 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 correspondingly processes the PLOAM message, the bandwidth information, the GEM payload data and the OMCI message which belong to the virtual ONU. Therefore, the access function of more ONUs can be realized on one optical network interface, and compared with the prior art, more ONUs can be accessed under the same optical branching ratio, so that the bandwidth is fully utilized, and more OLT management entities are provided on the basis of not increasing the number of ONU board cards; in addition, the access number of the ONUs in the NGPON2 network is increased at a low hardware cost, and the networking cost of the whole network is reduced.
Drawings
Fig. 1 is a schematic diagram of a topology structure of a typical PON defined by a g.989.1 protocol in the prior art;
fig. 2 is a schematic diagram of an implementation flow of an access method for multiple ONUs according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating the functional and logical relationships of various modules of different processing units according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a process flow of a PLOAM message after the expansion of the embodiment of the present invention;
fig. 5 is a schematic diagram of a registration management flow of an ONU according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a structure of an access device with multiple ONUs according to an embodiment of the present invention.
Detailed Description
So that the manner in which the features and aspects of the embodiments of the present invention can be understood in detail, a more particular description of the embodiments of the invention, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings.
As shown in fig. 2, an implementation procedure of an access method for multiple ONUs in the embodiment of the present invention includes the following steps:
step 200: more than one ONU is simulated on an ONU board card in a virtual way, each virtual ONU corresponds to an SN and a Register-ID used for identification, and the SN and the Register-ID are reported to the OLT in a registration stage to obtain the ONU-ID and maintain an MAC (media access control) message for the virtual ONU;
here, how to virtualize multiple ONUs belongs to the prior art, and details are not described here.
Step 201: in the uplink direction, acquiring the sending time slot of each virtual ONU according to the bandwidth allocated to each virtual ONU, assembling the sending time slot into uplink burst data according to the allocated bandwidth, and sending the uplink burst data to the OLT by carrying the ONU-ID in the sending time slot;
here, the plurality of ONUs share a downstream receiving port and an upstream transmitting port of the PON system, and are registered on the same group of downstream channels and upstream channels of the PON.
Here, because the propagation delay and the response time of each ONU are the same, the OLT assigns equal equalization delay, so that, when viewed from the transmitting side of the ONU, the bandwidth timeslots assigned to each ONU do not affect each other, thereby ensuring that the data of each ONU is transmitted accurately without collision.
Step 202: in the downlink direction, when ONU frame data sent by the OLT is received and after downstream frame delimitation, descrambling and FEC decoding, PLOAM information, bandwidth information, GEM payload data and OMCI information are respectively obtained; 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; the MAC information is maintained in order to update the MAC information in time.
Step 203: in different processing units, each virtual ONU correspondingly processes the PLOAM message, the bandwidth information, the GEM payload data and the OMCI message which belong to the virtual ONU.
Here, the different processing unit includes: 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, wherein the functions and logic relations of four constituent modules of different processing units are shown in FIG. 3.
In different processing units, each virtual ONU correspondingly processes the PLOAM message, the bandwidth information, the GEM payload data and the OMCI message which belong to the virtual ONU, and comprises the following steps:
each virtual ONU filters out PLOAM messages and broadcast PLOAM messages sent to the local virtual ONU according to the locally stored ONU-ID, and processes the PLOAM messages and the broadcast PLOAM messages;
each virtual ONU filters out the bandwidth sent to the local virtual ONU according to the locally stored Alloc-ID, and determines the bandwidth time slot of each virtual ONU according to the corresponding relation between the Alloc-ID and the ONU-ID;
here, how to determine the bandwidth timeslot of each virtual ONU belongs to the prior art specifically according to the correspondence between the Alloc-ID and the ONU-ID is not described herein again.
After the delimitation of the downlink GEM data is finished, filtering out GEM packets sent to the local virtual ONU by each virtual ONU according to a Port-ID stored locally;
after the GEM packet fragments are decrypted and recombined, each virtual ONU filters out OMCI messages sent to the local virtual ONU according to the locally stored Port-ID, and the OMCI messages are processed.
Here, in the downstream direction, the NGPON2 system maintains a set of unicast keys and multicast keys for each virtual ONU in a normal operating state, generates respective master keys using different Register-IDs of the respective virtual ONUs, and independently generates and updates keys of the respective virtual ONUs according to a flow specified by the g.989.3 protocol.
Wherein, the key is obtained according to the corresponding relation 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.
The key maintained by the NGPON2 system is also applicable to the encryption process of the upstream GEM packet, and is not described here any more.
The following describes the technical solution of the multiple ONU access method provided by the present invention in further detail:
in the embodiment of the present invention, the expanded PLOAM message processing flow is as shown in fig. 4, and the NGPON2 system maintains a broadcast PLOAM message channel, and maintains an independent PLOAM message channel for each successfully registered virtual ONU. In fig. 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 add a PLOAM message sub-channel; that is, one virtual ONU corresponds to one PLOAM message subchannel. Here, the valid AssignONU-ID is the matching between the SN carried by the message and a 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 messages.
When receiving a unicast PLOAM message sent to a virtual ONU, the PLOAM message processing module updates configuration information of the virtual ONU according to the content of the unicast PLOAM message, wherein the configuration information comprises an Alloc-ID, a key and the like, and writes a response uplink PLOAM message into a cache queue of the virtual ONU; when the OLT requires to send the PLOAM message, the PLOAM message is read out from the buffer queue, and the content of the read PLOAM message is filled into the uplink Burst to be sent out. When a PLOAM sending flag in a bandwidth allocated to the virtual ONU is 1, indicating that the OLT requires to send PLOAM messages; meanwhile, the state of the PLOAM cache queue in the virtual ONU can be reported to the OLT through an Ind domain in the Burst Header. When receiving a PLOAM message sent by broadcasting, updating configuration information of all virtual ONUs according to the content of the PLOAM message; and finally, monitoring the performance of all PLOAM channels to be maintained, and sending corresponding monitoring information to the OLT through the OMCI channel.
Each virtual ONU is preset with a corresponding cache queue for storing PLOAM messages.
Here, among all the virtual ONUs, the content configured by the downstream broadcast message of one virtual ONU may be shared by other virtual ONUs, and the content configured by the unicast message belongs to a single virtual ONU.
Similar to the process of PLOAM message processing, the NGPON2 system also provides an OMCI channel for each virtual ONU in normal operation, 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 is used for OMCI reception and transmission. In the downlink direction, after the GEM is decrypted and recombined, filtering out OMCI messages sent to the local virtual ONU according to a default Port-ID stored locally, and carrying out corresponding processing on the OMCI messages; after the content of the OMCI is analyzed, updating configuration information of the corresponding virtual ONU, such as the number of Port-IDs, encryption state, multicast keys and the like, generating response OMCI data, and further caching the generated OMCI data into a default service container (TCONT, Transmission Containers) of the virtual ONU; and when the virtual ONU receives the allocated time slot of the default TCONT, reading the OMCI data, encapsulating the OMCI data into a GEM packet carrying a default Port-ID, and sending the GEM packet serving as a payload of the burst.
When the OLT requires, monitoring information of the virtual ONU needs to be reported through an OMCI channel; and because the local virtual ONU shares the equipment and the downlink receiving data, the monitoring information of the equipment and the downlink is shared by all the ONUs. However, the upstream transmission and PLOAM channels are monitored independently for each virtual ONU and reported to the OLT only when needed. When the optical module is abnormally powered off, all the virtual ONUs in the local working state enable power failure alarm (Dying-gasp) positions in an uplink burst Ind domain to be set to be 1.
Here, the encryption status information of each Port-ID maintained by the system is obtained through the OMCI channel of the corresponding virtual ONU; when the virtual ONU sends the uplink data to the OLT, the uplink data enters the OLT in the form of optical signals.
Fig. 5 is a schematic diagram of a registration management process of a virtual ONU according to an embodiment of the present invention, which starts to check a state of a local virtual ONU after receiving a broadcast SN BandWidth in a downstream BandWidth Map (BWMAP, BandWidth Map), that is, check whether a virtual ONU is unregistered, and ignore a broadcast BandWidth and only need to process data and PLOAM BandWidth directly allocated to the virtual ONU if it is checked that the virtual ONU is registered; if the virtual ONU is detected to be unregistered, when the virtual ONUs are in the registration activation process, the received broadcast registration and ranging authorization are only sent to one of the virtual ONUs, and it is ensured that only one of the local virtual ONUs responds to a registration request and reports a corresponding SN during each windowing period of the OLT. And after the virtual ONU receives the distributed ONU-ID, the software system maintains the information of one virtual ONU more, and adds a PLOAM and OMCI management channel. And after the virtual ONU finishes ranging and enters an O5 state, issuing the analyzed SN request bandwidth to another virtual ONU, and starting the registration process of the other virtual ONU. And after all the virtual ONUs complete the registration, the SN request bandwidth is not analyzed any more.
In order to implement the foregoing method, an embodiment of the present invention further provides an access apparatus for multiple ONUs, as shown in fig. 6, the access apparatus includes a configuration module 61, an uplink processing module 62, a downlink processing module 63, and a data and message processing module 64; wherein the content of the first and second substances,
the configuration module 61 is used for virtually simulating more than one ONU on an ONU board card, each virtual ONU corresponds to an SN and a Register-ID for identification, and the SN and the Register-ID are reported to the OLT in a registration stage, so that the ONU-ID is obtained, and MAC information is maintained for the virtual ONU;
the uplink processing module 62 is configured to, in the uplink direction, obtain a sending time slot of each virtual ONU according to the bandwidth allocated to each virtual ONU, assemble uplink burst data according to the allocated bandwidth, and send the uplink burst data to the OLT in the sending time slot with the ONU-ID;
a downlink processing module 63, configured to, in a downlink direction, when receiving ONU frame data sent by the OLT in the uplink processing module 62, and after performing downstream frame delimitation, descrambling, and FEC decoding, obtain a PLOAM message, bandwidth information, GEM payload data, and an OMCI message, respectively; after the PLOAM message and the OMCI message are processed, the MAC information is dynamically updated according to the OLT configuration;
and a data and message processing module 64, configured to, in different processing units, perform corresponding processing on the PLOAM message, the bandwidth information, the GEM payload data, and the OMCI message belonging to each virtual ONU.
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 sub-modules: the system comprises a PLOAM message processing module, a bandwidth information analysis module, a GEM payload data processing module and an OMCI message processing module; wherein the content of the first and second substances,
the PLOAM message processing module is used for filtering PLOAM messages and broadcast PLOAM messages sent to the local virtual ONU according to the locally stored ONU-ID and processing the PLOAM messages and the broadcast PLOAM messages;
the bandwidth information analysis module is used for filtering out the bandwidth sent to the local virtual ONU according to the locally stored Alloc-ID and determining the bandwidth time slot of each virtual ONU according to the corresponding relation between the Alloc-ID and the ONU-ID;
the GEM payload data processing module is used for filtering out GEM packets sent to the local virtual ONU according to a locally stored Port-ID after the delimitation of the downlink GEM data is finished;
and the OMCI message processing module is used for filtering the OMCI message sent to the local virtual ONU according to the locally stored Port-ID after the GEM packet fragments are decrypted and recombined, and processing the OMCI message.
The PLOAM message processing module is further configured to update configuration information of the virtual ONU according to the PLOAM message and broadcast PLOAM message content, generate a corresponding uplink PLOAM message, write the generated uplink PLOAM message into a cache queue corresponding to each PLOAM channel, and wait for transmission in an allocated time slot.
Here, the plurality of ONUs share a downstream receiving port and an upstream transmitting port of the PON system, and are registered on the same set of downstream channel and upstream channel 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 may be implemented by a Central Processing Unit (CPU), a microprocessor Unit (MPU), a Digital Signal Processor (DSP), a Field Programmable Gate Array (FPGA), or the like on the ONU.
The embodiment of the invention simulates more than one ONU on one ONU board card, each virtual ONU corresponds to an SN and a Register-ID used for identification, reports the SN and the Register-ID to the OLT in a registration stage, acquires the ONU-ID and maintains a piece of MAC information for the virtual ONU; in the uplink direction, acquiring the sending time slot of each virtual ONU according to the bandwidth allocated to each virtual ONU, assembling the sending time slot into uplink burst data according to the allocated bandwidth, and sending the uplink burst data to the OLT by carrying the ONU-ID in the sending time slot; in the downlink direction, when ONU frame data sent by the OLT is received and after downstream frame delimitation, descrambling and FEC decoding, PLOAM information, bandwidth information, GEM payload data and OMCI information are respectively obtained; 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 correspondingly processes the PLOAM message, the bandwidth information, the GEM payload data and the OMCI message which belong to the virtual ONU. Therefore, the access function of more ONUs can be realized on one optical network interface, and compared with the prior art, more ONUs can be accessed under the same optical branching ratio, so that the bandwidth is fully utilized, and more OLT management entities are provided on the basis of not increasing the number of ONU board cards; in addition, the access number of the ONUs in the NGPON2 network is increased at a low hardware cost, and the networking cost of the whole network is reduced.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.

Claims (10)

1. The access method of a plurality of optical network units ONU is characterized in that more than one ONU is simulated on an ONU board card, each virtual ONU corresponds to a serial number SN and a registration identification Register-ID used for identification, and the serial number SN and the registration identification Register-ID are reported to an optical line terminal OLT in a registration stage to obtain the ONU identification ONU-ID and maintain a medium access control MAC information for the virtual ONU; the method comprises the following steps:
in the uplink direction, acquiring the sending time slot of each virtual ONU according to the bandwidth allocated to each virtual ONU, assembling the sending time slot into uplink burst data according to the allocated bandwidth, and sending the uplink burst data to the OLT by carrying the ONU-ID in the sending time slot;
in the downlink direction, when ONU frame data sent by the OLT is received and after the downstream frame delimitation, descrambling and forward error correction FEC decoding, respectively acquiring a physical layer operation administration maintenance PLOAM message, bandwidth information, a GPON encapsulation mode GEM payload data and an optical network unit management control interface OMCI message; 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 correspondingly processes the PLOAM message, the bandwidth information, the GEM payload data and the OMCI message which belong to the virtual ONU.
2. The method of claim 1, wherein the MAC information comprises: ONU-ID, configuration identification Alloc-ID, GEM Port identification Port-ID, equalization delay and secret key of the virtual ONU.
3. The method according to claim 2, wherein in different processing units, each virtual ONU performs corresponding processing on the PLOAM message, the bandwidth information, the GEM payload data, and the OMCI message belonging to itself, and the processing comprises:
each virtual ONU filters out PLOAM messages and broadcast PLOAM messages sent to the local virtual ONU according to the locally stored ONU-ID, and processes the PLOAM messages and the broadcast PLOAM messages;
each virtual ONU filters out the bandwidth sent to the local virtual ONU according to the locally stored Alloc-ID, and determines the bandwidth time slot of each virtual ONU according to the corresponding relation between the Alloc-ID and the ONU-ID;
after the delimitation of the downlink GEM data is finished, filtering out GEM packets sent to the local virtual ONU by each virtual ONU according to a Port-ID stored locally;
after the GEM packet fragments are decrypted and recombined, each virtual ONU filters out OMCI messages sent to the local virtual ONU according to the locally stored Port-ID, and the OMCI messages are processed.
4. The method of claim 3, further comprising: and updating the configuration information of the virtual ONU according to the PLOAM message and the broadcast PLOAM message content, generating a corresponding uplink PLOAM message, writing the generated uplink PLOAM message into a cache queue corresponding to each PLOAM channel, and waiting for sending in the allocated time slot.
5. The method of claim 1, wherein the ONUs share a downstream receive port and an upstream transmit port of a Passive Optical Network (PON) system and register on a same set of downstream and upstream channels of the PON.
6. An access apparatus for a plurality of ONUs, the apparatus comprising:
the configuration module is used for virtually simulating more than one ONU on an ONU board card, each virtual ONU corresponds to an SN and a Register-ID used for identification, and the SN and the Register-ID are reported to the OLT in a registration stage, so that the ONU-ID is obtained, and MAC information is maintained for the virtual ONU;
the uplink processing module is used for acquiring the sending time slot of each virtual ONU in the uplink direction according to the bandwidth allocated to each virtual ONU, assembling the sending time slot into uplink burst data according to the allocated bandwidth, and sending the uplink burst data to the OLT by carrying the ONU-ID in the sending time slot;
the downlink processing module is used for respectively acquiring PLOAM information, bandwidth information, GEM payload data and OMCI information after downlink frame delimitation, descrambling and FEC decoding when ONU frame data sent by the OLT in the uplink processing module is received in the downlink direction; after the PLOAM message and the OMCI message are processed, the MAC information is dynamically updated according to the OLT configuration;
and the data and message processing module is used for correspondingly processing the PLOAM message, the bandwidth information, the GEM payload data and the OMCI message which belong to each virtual ONU in different processing units.
7. The apparatus of claim 6, wherein the MAC information comprises: ONU-ID, Alloc-ID, GEM Port-ID, equalization delay and key of the virtual ONU.
8. The apparatus of claim 7, wherein the data and message processing module further comprises:
the PLOAM message processing module is used for filtering PLOAM messages and broadcast PLOAM messages sent to the local virtual ONU according to the locally stored ONU-ID and processing the PLOAM messages and the broadcast PLOAM messages;
the bandwidth information analysis module is used for filtering out the bandwidth sent to the local virtual ONU according to the locally stored Alloc-ID and determining the bandwidth time slot of each virtual ONU according to the corresponding relation between the Alloc-ID and the ONU-ID;
the GEM payload data processing module is used for filtering out GEM packets sent to the local virtual ONU according to a locally stored Port-ID after the delimitation of the downlink GEM data is finished;
and the OMCI message processing module is used for filtering the OMCI message sent to the local virtual ONU according to the locally stored Port-ID after the GEM packet fragments are decrypted and recombined, and processing the OMCI message.
9. The apparatus of claim 8, wherein the PLOAM message processing module is further configured to update configuration information of the virtual ONU according to the PLOAM message and broadcast PLOAM message contents, generate a corresponding upstream PLOAM message, write the generated upstream PLOAM message into a buffer queue corresponding to each PLOAM channel, and wait for transmission in an allocated timeslot.
10. The apparatus of claim 6, wherein the plurality of ONUs share a downstream receive port and an upstream transmit port of the PON system and are registered on a same set of downstream and upstream channels of the PON.
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