CN101640815B - Remote transmission method, remote transmission device and remote transmission system for PON - Google Patents
Remote transmission method, remote transmission device and remote transmission system for PON Download PDFInfo
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- CN101640815B CN101640815B CN 200810117353 CN200810117353A CN101640815B CN 101640815 B CN101640815 B CN 101640815B CN 200810117353 CN200810117353 CN 200810117353 CN 200810117353 A CN200810117353 A CN 200810117353A CN 101640815 B CN101640815 B CN 101640815B
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Abstract
The embodiment of the invention provides a remote transmission method, a remote transmission device and a remote transmission system for a PON. The method mainly comprises the steps of: additionally arranging an extender box (EB) on an optical transmission channel between an ODN and an OLT of the PON, interconnecting the EB and the OLT through a PSN network, bearing a data link layer frame of the PON transmitted between the EB and the OLT on a PW, or firstly bearing the data link layer frame on an ETH and then bearing the data link layer frame on the PW, and then sending the data link layer frame through a PSN tunnel. The utilization of the method, the device and the system realizes the long-distance transmission of the PON. The prior PSN network in the PON is fully utilized, thereby reducing the secondary invested cost for the long-distance transmission of the PON and ensuring that the prophase investment is protected.
Description
Technical field
The present invention relates to EPON (PON, Passive Optical Network) field, relate in particular to remote transmission method, device and the system of a kind of PON.
Background technology
PON adopts point-to-multipoint topological structure as a kind of broadband optical access technology, and the network architecture of a kind of PON as shown in Figure 1.PON is comprised of optical line terminal (OLT, Optical Line Terminal), passive splitting network (ODN, Optical Distribution Network) and one or more optical network unit (ONU, Optical Network Unit).OLT is positioned at the central office, Wide Area Network interface upwards is provided, comprise Gigabit Ethernet (GE, Gigabit Ethernet), asynchronous transfer mode (ATM, asynchronous transfer mode), the interface such as synchronous digital hierarchy (SDH, Synchronous Digital Hierarchy); ONU is positioned at user's side, and the application interfaces such as 10/100BaseT, T1/E1, Digital Subscriber Line (DSL, digital subscribe rline) are provided for the user; ODN is made of passive devices such as splitter/couplers, connects an OLT and one or more ONU with passive mode.
Above-mentioned PON transmission range shown in Figure 1 is shorter, usually less than 20 kilometers, and the position of IP fringe node is usually distant, must be through aggregation networks (the PSN(packet network among Fig. 1, Packet Switched Network) network on the OLT) be connected to the IP fringe node.In order to support the long distance transmit of OLT and ONU, need to the light signal in the optical fiber be amplified, increase power amplifier equipment at optical transmission pathway.
In realizing process of the present invention; the inventor finds that the shortcoming of PON in the prior art is: in order to realize the remote transmission of PON; must rebuild the PON network based on power amplifier equipment, will cause that existing PSN network can not be effectively utilized among the PON, up-front investment can't be protected.And the price of above-mentioned power amplifier equipment is comparatively expensive.
Summary of the invention
The embodiment of the invention provides remote transmission method, device and the system of a kind of PON, thereby can solve in the prior art scheme when realizing the remote transmission of PON, can not effectively utilize existing PSN network among the PON, the problem that cost is higher.
The embodiment of the invention is achieved through the following technical solutions:
A kind of PSN tunnel processing unit is arranged at least one end at two ends of the PSN tunnel of PON, and between the ODN and IP fringe node of described PSN tunnel in PON, described PSN tunnel processing unit comprises:
A kind of PON is carried on the system of PW, comprising: such as each described EB of claim 2 to 4 with such as each described OLT of claim 5 to 7, transmit mutually the data link layer frame of PON between described EB and the described OLT by PSN tunnel.
The remote transmission method of a kind of PON, described method specifically comprises:
The PON data link layer frame that reception sends over from ODN sends to OLT after this PON data link layer frame is packaged in PSN tunnel, and the described PON data link layer that wherein is packaged in PSN tunnel can be by described OLT decapsulation;
Or receive the PON data link layer frame that is packaged in PSN tunnel that sends over from OLT, carry out decapsulation and obtain sending to ODN behind the described PON data link layer frame.
As seen from the above technical solution provided by the invention, the embodiment of the invention is by increasing EB at optical transmission pathway, only the terminate physical layer function of PON of EB, but the data link layer functions of the PON that do not terminate, the data link layer of PON is zoomed out the position of IP fringe node (as zoom out) by the PSN network, realized the PON transmission of long distance.
Description of drawings
Fig. 1 is the network architecture schematic diagram of a kind of PON in the prior art;
The network architecture schematic diagram of the distance transmission system of a kind of PON that Fig. 2 provides for the embodiment of the invention one;
The topological structure schematic diagram of the EB equipment in the distance transmission system of the PON that Fig. 3 provides for the embodiment of the invention one and a kind of annular networking of the PSN network between the OLT;
The PON over PSN protocol stack schematic diagram that Fig. 4 provides for the embodiment of the invention two;
The function structure schematic diagram of the EB that Fig. 5 provides for the embodiment of the invention two;
The function structure schematic diagram of the OLT that Fig. 6 provides for the embodiment of the invention two;
The clock schematic diagram of the OLT that the employing ethernet clock that Fig. 7 provides for the embodiment of the invention two is synchronous;
The clock schematic diagram of the EB that the employing ethernet clock that Fig. 8 provides for the embodiment of the invention two is synchronous;
The clock schematic diagram of the OLT of the employing Self-Adaptive Clock Synchronization that Fig. 9 provides for the embodiment of the invention two;
The clock schematic diagram of the EB of the employing Self-Adaptive Clock Synchronization that Figure 10 provides for the embodiment of the invention two;
The clock schematic diagram of the OLT that the employing differential clocks that Figure 11 provides for the embodiment of the invention two is synchronous;
The clock schematic diagram of the EB that the employing differential clocks that Figure 12 provides for the embodiment of the invention two is synchronous;
The PON over VPLS/VPWS protocol stack schematic diagram that Figure 13 provides for the embodiment of the invention three;
The function structure schematic diagram of the EB that Figure 14 provides for the embodiment of the invention three;
The function structure schematic diagram of the OLT that Figure 15 provides for the embodiment of the invention three.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
In embodiments of the present invention, a PSN tunnel is set in PON, between the ODN and IP fringe node of described PSN tunnel in PON, can utilizes that the PSN network between the existing OLT and IP fringe node makes up among the PON.At the two ends of described PSN tunnel the PSN tunnel processing unit is set, comprises the PSN tunnel processing module in the described PSN tunnel processing unit.
Described PSN tunnel processing module is used for the PON data link layer frame that reception need to send to the opposite end of described PSN tunnel, this PON data link layer frame is packaged in PSN tunnel obtains data message, this data message is sent to the opposite end of described PSN tunnel; Perhaps, receive the data message that the opposite end of described PSN tunnel sends over by described PSN tunnel, this data message is carried out the PSN tunnel decapsulation obtain PON data link layer frame, this PON data link layer frame is sent.
Further, described PSN tunnel processing unit can be OLT and the extender equipment (EB that increases at ODN and the optical transmission pathway between the OLT of PON, Extender Box), by the PSN network interconnection, transmit mutually the data link layer frame of PON between described EB and the described OLT by PSN tunnel between EB and OLT.Concrete processing procedure comprises:
Described EB receives the PON data link layer frame that ODN sends over, and sends to OLT after this PON data link layer frame is packaged in PSN tunnel, and described OLT receives described data link layer frame from described PSN tunnel, and sends to the IP fringe node;
Described OLT receives the PON data link layer frame that the user sends over, and the data link layer frame of PON is sent to EB by PSN tunnel, and described EB receives described data link layer frame from described PSN tunnel, and sends to ODN.
Further, the data link layer frame of the PON that transmits between EB and the OLT is carried on the pseudo-line of PW(, Pseudo Wires), or, be carried on first the ETH(Ethernet), be carried on again PW, then, send by PSN tunnel.
1, the above-mentioned PON method that is carried on PW specifically comprises:
EB receives the PON data link layer frame that ODN sends over, regenerate the lead code of this PON data link layer frame, finish the payload encapsulation process and the PW multiplex process that this PON data link layer frame are mapped to corresponding PW, obtain the PW-PDU(data cell, Protocol Data Unit), obtain data message after this PW-PDU is packaged in PSN tunnel, this data message is sent to OLT by the PSN network.Described OLT receives described data message from EB from described PSN tunnel, this data message is carried out the PSN tunnel decapsulation to be processed, obtain PW-PDU, this PW-PDU is carried out the decapsulation of PW payload and PW demultiplexing, obtain PON data link layer frame, this PON data link layer frame is carried out sending to the IP fringe node after the PON data link layer deals;
OLT receives the PON data link layer frame that the user sends over, this PON data link layer frame is carried out the PON data link layer deals, finish the payload encapsulation process and the PW multiplex process that this PON data link layer frame are mapped to corresponding PW, obtain PW-PDU, obtain data message after this PW-PDU is packaged in PSN tunnel, this data message is sent to EB by the PSN network.Described EB is from the described data message of PSN network reception from OLT, this data message is carried out the PSN tunnel decapsulation process, obtain PW-PDU, this PW-PDU is carried out the decapsulation of PW payload and PW demultiplexing, obtain PON data link layer frame, this PON data link layer frame is sent to ODN.
Further, described OLT sends the relevant clock information of its PON to EB, and described EB carries out the PON clock of EB and the PON clock of OLT according to the relevant clock information of the described PON that receives synchronously.
2, above-mentioned PON is carried on first ETH, and the method that is carried on again PW specifically comprises:
Described EB receives the PON data link layer frame that ODN sends over,
Regenerate the lead code of this PON data link layer frame, finish the payload encapsulation process that this PON data link layer frame is mapped to corresponding ethernet frame, obtain ethernet frame, finish the payload encapsulation and the PW multiplex process that ethernet frame are mapped to corresponding PW, obtain data message after the PW-PDU that obtains is packaged in PSN tunnel, this data message is sent to OLT by the PSN network.Described OLT receives described data message from EB from described PSN tunnel, this data message is carried out PSN tunnel decapsulation processing obtain PW-PDU, this PW-PDU is carried out the decapsulation of PW payload and the PW demultiplexing obtains ethernet frame, this ethernet frame is carried out the Ethernet payload decapsulation obtain PON data link layer frame, this PON data link layer frame is carried out sending to the IP fringe node after the PON data link layer deals;
Described OLT receives the PON data link layer frame that the user sends over, this PON data link layer frame is carried out the PON data link layer deals, finish the payload encapsulation process that this PON data link layer frame is mapped to corresponding ethernet frame, obtain ethernet frame, finish the payload encapsulation and the PW multiplex process that ethernet frame are mapped to corresponding PW, obtain data message after the PW-PDU that obtains is packaged in PSN tunnel, this data message is sent to EB by the PSN network.Described EB receives described data message from OLT from described PSN tunnel, this data message is carried out PSN tunnel decapsulation processing obtain PW-PDU, this PW-PDU is carried out the decapsulation of PW payload and the PW demultiplexing obtains ethernet frame, this ethernet frame is carried out the Ethernet payload decapsulation obtain PON data link layer frame, this PON data link layer frame is sent to ODN.
Further, described OLT sends the relevant clock information of its PON to EB, and described EB carries out the PON clock of EB and the PON clock of OLT according to the relevant clock information of the described PON that receives synchronously.
For ease of the understanding to the embodiment of the invention, be further explained explanation below in conjunction with accompanying drawing as an example of several specific embodiments example, and each embodiment does not consist of the restriction to the embodiment of the invention.
Embodiment one
The network architecture of the distance transmission system of a kind of PON that the embodiment of the invention one provides as shown in Figure 2.
As shown in Figure 2, in order to support the long distance transmit of OLT and ONU, this embodiment increases EB at the ODN of PON and the optical transmission pathway between the OLT, pass through the PSN network interconnection between EB and OLT, this PSN network can be the PSN network between existing OLT among the PON and the IP fringe node, at this moment, OLT is arranged at the IP fringe node side of far-end, can link to each other by wired or wireless between OLT and the IP fringe node.Interconnected by existing optical transmission pathway between EB and the ODN.
The physical layer function of above-mentioned EB termination PON, but the data link layer functions of the PON that do not terminate.Above-mentioned EB is as the PE(provider edge equipment, Provider Edge) equipment, the data link layer frame of PON is carried on PW; Perhaps the data link layer frame of PON is carried on first ETH(Ethernet, Ethernet), be carried on again PW, then, the data link layer frame of above-mentioned PON is sent to OLT by PSN tunnel, and OLT obtains the data link layer frame of above-mentioned PON from PSN tunnel, finishes the data link layer functions of PON.Equally, OLT also can be carried on PW with the data link layer frame of PON; Perhaps the data link layer frame of PON is carried on first ETH, is carried on PW again, then, the data link layer frame of above-mentioned PON is sent to EB by PSN tunnel.
PSN network between above-mentioned EB equipment and the OLT can adopt the topological structures such as annular networking or star net forming, and wherein annular networking has better transmission reliability.The topological structure of a kind of annular networking of above-mentioned PSN network as shown in Figure 3, this annular networking can adopt Resilient Packet Ring (RPR, Resilient Packet Ring) professional (VPLS, Virtual Private LAN Service) looped network of looped network or private virtual lan.
Embodiment two
In this embodiment, the data link layer frame of PON is carried on PW, is sent to OLT by PSN tunnel again.
The PON over PSN protocol stack schematic diagram that this embodiment provides as shown in Figure 4.
For GPON, GTC(gigabit passive optical network transmission convergence layer, GPON Transmission Convergence layer) TC(Transmission Convergence, Transmission Convergence) frame is as PW PDU(protocol Data Unit, Protocol Data Unit) payload, be carried on PW, wherein GTC TC uplink frame will comprise complete PLOu(upstream physical layer expense, Physical Layer Overhead upstream) (comprising lead code) be carried on PW; For EPON, comprise the GMII frame of EPON of lead code as the payload of PW PDU, be carried on PW.
The function structure schematic diagram of EB among this embodiment as shown in Figure 5.Comprise such as lower module:
PSN tunnel processing module 504 be used for to receive the PON data link layer frame that the PON PLIM sends over, this PON data link layer frame is packaged in PSN tunnel after, send to network side interface processing module; Perhaps, receive the data message that network side interface processing module sends over, this data message is carried out the PSN tunnel decapsulation process, obtain PON data link layer frame, this PON data link layer frame is sent to the PON PLIM;
Network side interface processing module 505, the sending and receiving that is used for network side is processed, the PON data link layer frame that the PSN tunnel processing module is sended over sends to OLT by the PSN network, will send to the PSN tunnel processing module from the data message from OLT that the PSN network receives.
Further, the EB in the present embodiment can also comprise:
PON over PW processing module 503, be used for receiving the PON data link layer frame that the PON PLIM sends over, finish the payload encapsulation process and the PW multiplex process that this PON data link layer frame are mapped to corresponding PW, obtain PW-PDU, this PW-PDU is sent to the PSN tunnel processing module; Perhaps, receive the PW-PDU that described PSN tunnel processing module sends over, this PW-PDU is carried out the decapsulation of PW payload and PW demultiplexing, obtain PON data link layer frame, this PON data link layer frame is sent to the PON PLIM.
Further, the EB in the present embodiment can also comprise:
Queuing buffer 502, be used for when receiving the PON data link layer frame that sends over from PSN tunnel, compensating this PON data link layer frame transmits in PSN tunnel and the shake (jitter) that brings and drift about (wander), what queuing buffer 502 adopted at the read-write clock of PON side is clock with PON PLIM 501 homologies, such as the clk4 among Fig. 5; What queuing buffer 502 adopted at the read-write clock of network side is clock with network side interface processing module 505 homologies.
The significant instant that above-mentioned jitter and wander is defined as digital signal departs from the short-period fluctuation of its ideal position and for a long time change in time.The size of this queuing buffer 502 should be greater than the maximum jitter in the PSN network and drift.
Further, the EB in the present embodiment can also comprise:
PON clock synchronization module 506, be used for according to the relevant clock information of PON from OLT, synchronously the PON clock (such as the Clk4 among Fig. 5) of EB and the PON clock (such as the Clk1 among Fig. 6) of OLT are for the PON PLIM 501 of EB and the PON side of queuing buffer 502 provide clock signal C lk4.EB and OLT are used for guaranteeing that EB and OLT require lower at the clock accuracy of PON synchronously, with same speed PON data link layer frame is processed, with overflow or the underflow of avoiding queuing buffer, thereby can cause PON data link layer Frame Alignment Loss, thereby interrupt the service of PON network.
In this case, described PSN tunnel processing module receives the PW-PDU that PON over PW processing module 503 sends over, and this PW-PDU is packaged in PSN tunnel, passes to network side interface processing module 505; Perhaps, the data message from network side interface processing module 505 is carried out the PSN tunnel decapsulation process, obtain PW-PDU, this PW-PDU is sent to PON over PW processing module 503.Above-mentioned PSN tunnel encapsulation and decapsulation process mainly contain 3 kinds of optional PW outer layer tunnel encapsulation modes, are respectively: IP/UDP pattern, L2TPv3 pattern and MPLS pattern.
In this case, above-mentioned PON PLIM 501 is obtained the PON data link layer frame from OLT by the PSN tunnel transmission from queuing buffer 502, perhaps send from the PON of ONU data link layer frame to queuing buffer 502.Wherein, sending to queuing buffer 502 before the PON of ONU data link layer frame, need to regenerate the lead code of PON data link layer frame.
For GPON, finish the GPM sublayer function of GPON, PON data link layer frame is GTC TC frame, need to regenerate the lead code of GTC uplink frame; For EPON, finish the PHY layer function of EPON, comprise that the PDM(pulse duration modulates, pulse duration modulation pulse width modulation), PMA(Physical Medium Attachment, the physical medium access), PCS(Physical Coding Sublayer, Physical Coding Sublayer), PON data link layer frame is the Gigabit Media Independent Interface (GMII of EPON, Gigabit Media Independent Interface) frame need to regenerate the lead code of GMII uplink frame.
In this case, PON over PW processing module 503 is obtained PON data link layer frame from queuing buffer 502, finishes the payload encapsulation process and the PW multiplex process that this PON data link layer frame are mapped to corresponding PW, obtain PW-PDU, this PW-PDU is sent to PSN tunnel processing module 504; Receive the PW-PDU that PSN tunnel processing module 504 sends over, this PW-PDU is carried out payload decapsulation and PW demultiplexing, obtain PON data link layer frame, send this PON data link layer frame to queuing buffer 502.The encapsulation of the payload of above-mentioned PON over PW and decapsulation comprise to PON data link layer frame converge, regularly and/or ordering process.
The function structure schematic diagram of the OLT that this embodiment provides comprises as shown in Figure 6 such as lower module:
User side interface processing module 601, the sending and receiving that is used for user's side is processed, and the PON data link layer frame that the PSN tunnel processing module is sended over sends to EB by the PSN network; Perhaps, will send to the PSN tunnel processing module from the data message from EB that the PSN network receives;
PSN tunnel processing module 602 is used for that the data message that the user side interface processing module sends over is carried out the PSN tunnel decapsulation and processes, and obtains PON data link layer frame, this PON data link layer frame is sent to the two layer function processing modules of PON; Perhaps, the PON data link layer frame that the two layer function processing modules of reception PON send over is packaged in PSN tunnel with this PON data link layer frame, sends to IP fringe node side interface processing module;
The two layer function processing modules 605 of PON, be used for finishing PON data link layer deals function, receive the PON data link layer frame that the PSN tunnel processing module sends over, this PON data link layer frame is carried out sending to the IP fringe node after the PON data link layer deals; Perhaps, receive the PON data link layer frame that the user sends over, this PON data link layer frame is carried out sending to the PSN tunnel processing module after the PON data link layer deals.
Further, the OLT among this embodiment can also comprise:
PON over PW processing module 603, be used for to receive the PON data link layer frame that the two layer function processing modules of PON send over, finish the payload encapsulation process and the PW multiplex process that this PON data link layer frame are mapped to corresponding PW, obtain PW-PDU, this PW-PDU is sent to the PSN tunnel processing module; Receive the PW-PDU that the PSN tunnel processing module sends over, this PW-PDU is carried out the decapsulation of PW payload and PW demultiplexing, obtain PON data link layer frame, this PON data link layer frame is sent to the two layer function processing modules of PON.
Further, the OLT among this embodiment can also comprise:
Queuing buffer 604, be used for when receiving the PON data link layer frame that sends over from PSN tunnel, compensate that this PON data link layer frame transmits and the jitter and wander that brings in PSN tunnel, what queuing buffer 604 adopted at the read-write clock of PON side is clock with two layer function processing modules, 605 homologies of PON, such as the clk1 among Fig. 6; What queuing buffer adopted at the read-write clock of network side is clock with user side interface processing module 601 homologies.
Further, the OLT among this embodiment can also comprise:
PON clock synchronization module 606, be used for providing the relevant clock information of PON of OLT to EB according to the PON clock, so that EB carries out the PON clock of its PON clock and OLT synchronously, for the two layer function processing modules 605 of the PON of OLT and the PON side of queuing buffer 604 provide PON clock signal C lk1.
In this case, PSN tunnel processing module 602 receives the PW-PDU from PON over PW processing module 603, and this PW-PDU is packaged in PSN tunnel, passes to user side interface processing module 601 and processes; Perhaps, the data message from user side interface processing module 601 is carried out the PSN tunnel decapsulation process, obtain PW-PDU and be sent to PON over PW processing module 603.Above-mentioned PSN tunnel encapsulation and decapsulation process mainly contain 3 kinds of optional PW outer layer tunnel encapsulation modes, are respectively: IP/UDP pattern, L2TPv3 pattern and MPLS pattern.
In this case, PON over PW processing module 603 is obtained PON data link layer frame from queuing buffer 604, finishes the payload encapsulation process and the PW multiplex process that this PON data link layer frame are mapped to corresponding PW, obtain PW-PDU, this PW-PDU is sent to PSN tunnel processing module 602; Receive the PW-PDU that PSN tunnel processing module 602 sends over, this PW-PDU is carried out payload decapsulation and PW demultiplexing, obtain PON data link layer frame, send this PON data link layer frame to queuing buffer 604.The encapsulation of the payload of above-mentioned PON over PW and decapsulation comprise to PON data link layer frame converge, regularly and/or ordering process.
In this case, the two layer function processing modules 605 of PON, from queuing buffer 604, obtain the PON data link layer frame from EB that transmits by PSN tunnel, this PON data link layer frame is carried out the PON data link layer deals, perhaps, receive the PON data link layer frame that the user sends over, this PON data link layer frame is carried out sending to queuing buffer 604 after the PON data link layer deals.
PON clock synchronous between above-mentioned EB and OLT, can adopt three kinds of schemes: ethernet clock synchronously, Self-Adaptive Clock Synchronization or differential clocks be synchronous.
1, ethernet clock is synchronous.
The clock schematic diagram of the OLT that employing ethernet clock in this scheme is synchronous as shown in Figure 7, the clock schematic diagram of the EB that the employing ethernet clock in this scheme is synchronous is as shown in Figure 8.
Shown in Fig. 7-8, this scheme requires each network element of EB, OLT and PSN network to support that all ethernet clock is synchronous.
The Clk1 of OLT and Clk2 all with the PON clock as the reference clock, the tranmitting data register of the Ethernet interface processing module of OLT is clk2.Wherein, Clk2 is the PSN clock, for the PSN side of PON over PW processing module, PSN tunnel processing module, Ethernet interface processing module and the queuing buffer of OLT provides clock signal.
OLT and EB adopt the Ethernet interface processing module of supporting synchronous ethernet, the Ethernet phy clock of EB recovers module will recover the ethernet physical layer tranmitting data register clk2 of OLT from the ethernet physical layer signal that OLT sends, as the PON clock Clk4 of EB and the reference clock of PSN network clocking Clk3, thus realized the PON clock of OLT and EB the PON clock synchronously.Above-mentioned Clk3 is the PSN clock, for the PSN side of PON over PW processing module, PSN tunnel processing module, Ethernet interface processing module and the queuing buffer of EB provides clock signal.
2, Self-Adaptive Clock Synchronization.
The clock schematic diagram of the OLT of the employing Self-Adaptive Clock Synchronization in this scheme as shown in Figure 9, the clock schematic diagram of the EB of the employing Self-Adaptive Clock Synchronization in this scheme is as shown in figure 10.
Shown in Fig. 9-10, OLT and EB respectively have one by accordingly take the counter of local PON clock as triggering, OLT counter 1 provides clock by PON clock 1, EB counter 2 provides clock by PON clock 2.
The PON over PW processing module of each OLT is finished the payload encapsulation process that a new PON data link layer frame is mapped to corresponding PW, will be inserted into the value in the counter 1 in the timestamp field of packets headers, then delivers the packet on the PSN network.When this grouping arrived EB, above-mentioned timestamp was extracted from packets headers by the PON over PW processing module of EB, and compared with timestamp (value in the counter 2 of EB) that this locality produces.Comparative result is used for the frequency of the local oscillator of adjusting PON clock 2.If when the difference between the timestamp of OLT and EB no longer changed with the grouping that receives continuously, then the PON clock of OLT and EB had reached synchronous.If this difference increases with the grouping that receives continuously, then the PON clock frequency of EB needs to improve, otherwise then this frequency needs to reduce.
Under this scheme, resolution (the minimum phase error between OLT source and the EB purpose oscillator) equals the cycle that OLT source and EB destination are used for the value-added clock of Time Stamp Counter.
3, differential clocks is synchronous.
The clock schematic diagram of the OLT that employing differential clocks in this scheme is synchronous as shown in figure 11, the clock schematic diagram of the EB that the employing differential clocks in this scheme is synchronous is as shown in figure 12.
Shown in Figure 11-12, require except the PON clock, all PSN network nodes all are synchronized to a common clock, for EB and OLT, PSN network clocking 1 and PSN network clocking 2 homologies.
The PON over PW processing module of each OLT is finished the payload encapsulation process that a new PON data link layer frame is mapped to corresponding PW, will insert the timestamp that comparator 1 produces in the packets headers, this timestamp value is directly proportional with difference between PON clock 1 and the PSN network clocking 1, then delivers the packet on the PSN network.When this grouping arrived EB, above-mentioned timestamp was extracted from packets headers by the PON over PW processing module of EB, and itself and local timestamp that produces are compared, and wherein local time stamp is directly proportional with difference between PON clock 2 and the PSN network clocking 2.Result relatively is used for the frequency of the local oscillator of adjusting EB node PON clock 2.When local time stamp equals the source time stamp of OLT generation, just reached synchronous.
Embodiment three
In this embodiment, the data link layer frame of PON will be carried on first ETH, is carried on PW again, then, is sent to OLT by PSN tunnel.
For GPON, GTC TC frame is carried on ETH as the payload of ethernet frame, and wherein the GTCTC uplink frame will comprise complete PLOu(and comprise lead code) be carried on ETH; For EPON, comprise the GMII frame of EPON of lead code as the payload of ethernet frame, be carried on ETH.
Above-mentioned ETH can be professional for the VPLS(private virtual lan, Virtual Private LAN Service)/VPWS(virtual private circuit is professional, Virtual Private Wire Service) network, be about to PON and be carried on the VPLS/VPWS network, PON over VPLS/VPWS protocol stack schematic diagram as shown in figure 13.
The EB function structure schematic diagram that this embodiment provides as shown in figure 14.Comprise such as lower module:
PON PLIM 1401, PSN tunnel processing module 1406 and network side interface processing module 1407.The function of these three modules is identical with network side interface processing module 505 with PON PLIM 501, PSN tunnel processing module 504 among above-described embodiment two described EB.
Further, the EB among this embodiment can also comprise:
PON over ETH processing module 1403, be used for receiving the PON data link layer frame that PON PLIM 1401 sends over, finish that this PON data link layer frame is mapped to corresponding payload encapsulation process with ethernet frame, the ethernet frame that obtains is sent to PSN tunnel processing module 1406; Perhaps, receive the ethernet frame that PSN tunnel processing module 1406 sends over, this ethernet frame is carried out the Ethernet payload decapsulation obtain PON data link layer frame, this PON data link layer frame is sent to PON PLIM 1401.
Further, the EB among this embodiment can also comprise:
PW processing module 1405 is used for receiving the ethernet frame that PON over ETH processing module 1403 sends, and finishes the payload encapsulation and the PW multiplex process that ethernet frame are mapped to corresponding PW, and the PW-PDU that obtains is sent to PSN tunnel processing module 1406; Perhaps, receive the PW-PDU that PSN tunnel processing module 1406 sends, this PW-PDU is carried out the decapsulation of PW payload and PW demultiplexing, the ethernet frame that obtains is sent to PON over ETH processing module 1403.
Further, the EB among this embodiment can also comprise:
Queuing buffer 1402, be used for when receiving the PON data link layer frame that sends over from PSN tunnel, compensate that this PON data link layer frame transmits and the jitter and wander that brings in PSN tunnel, what queuing buffer 1402 adopted at the read-write clock of PON side is clock with PON PLIM 1401 homologies, such as the clk4 among Figure 14; What queuing buffer adopted at the read-write clock of network side is clock with network side interface processing module 1407 homologies.
Further, the EB among this embodiment can also comprise:
PON clock synchronization module 1408, be used for according to the relevant clock information of PON from OLT, synchronously the PON clock (such as the Clk4 among Figure 14) of EB and the PON clock (such as the Clk1 among Figure 15) of OLT are for the PON PLIM 1401 of EB and the PON side of queuing buffer 1402 provide clock signal C lk4.
In this case, PSN tunnel processing module 1406 receives the PW-PDU from PW processing module 1405, and this PW-PDU is packaged in PSN tunnel, passes to network side interface processing module 1407; Perhaps, the data message from network side interface processing module 1407 is carried out the PSN tunnel decapsulation process, obtain PW-PDU and be sent to PW processing module 1405.
In this case, PON PLIM 1401, the 1402 PON data link layer frames from OLT of obtaining by the PSN tunnel transmission perhaps send from the PON of ONU data link layer frame to queuing buffer 1402 from queuing buffer.Wherein, send before the PON of ONU data link layer frame to queuing buffer 1402, the lead code that need to finish PON data link layer frame regenerates.
In this case, PON over ETH processing module 1403 is obtained PON data link layer frame from queuing buffer 1402, finishes the payload encapsulation process that PON data link layer frame is mapped to corresponding ethernet frame; Receive the ethernet frame that VPLS transponder 1404 sends, this ethernet frame is carried out the Ethernet payload decapsulation, obtain PON data link layer frame, send this PON data link layer frame to queuing buffer 1402.
In this case, PW processing module 1405 is obtained ethernet frame from PON over ETH processing module 1403, finishes the payload encapsulation and the PW multiplex process that ethernet frame are mapped to corresponding PW, and the PW-PDU that obtains is sent to PSN tunnel processing module 1406; Receive the PW-PDU that PSN tunnel processing module 1406 sends, this PW-PDU is carried out the decapsulation of PW payload and PW demultiplexing, obtain ethernet frame, send this ethernet frame to PON over ETH processing module 1403.
Further, when above-mentioned ETH was VPLS/VPWS, the EB among this embodiment can also comprise:
VPLS transponder 1404, be used for receiving the ethernet frame from PON over ETH processing module 1403/PW processing module 1405, finish 802.1ad bridging functionality and VPLS/VPWS forwarding capability, transmit ethernet frame to PW processing module 1405/PON overETH processing module 1403.
The function structure schematic diagram of the OLT that this embodiment provides comprises as shown in figure 15 such as lower module:
The two layer function processing modules 1507 of user side interface processing module 1501, PSN tunnel processing module 1502 and PON, the function of the two layer function processing modules 605 of user side interface processing module 601, PSN tunnel processing module 602 and PON among these three modules and the embodiment two described OLT is identical.
Further, the OLT among this embodiment can also comprise:
PON over ETH processing module 1505, be used for receiving the data message that PSN tunnel processing module 1502 sends over, this data message is carried out the Ethernet payload decapsulation obtain PON data link layer frame, this PON data link layer frame is sent to the two layer function processing modules 1507 of PON; Perhaps, the PON data link layer frame that the two layer function processing modules 1507 of reception PON send over is finished the payload encapsulation process that this PON data link layer frame is mapped to corresponding ethernet frame, and the ethernet frame that obtains is sent to PSN tunnel processing module 1502.
Further, the OLT among this embodiment can also comprise:
Further, the OLT among this embodiment can also comprise:
Further, the OLT among this embodiment can also comprise:
PON clock synchronization module 1508, be used for providing the relevant clock information of PON of OLT to EB according to the PON clock, so that EB carries out the PON clock of its PON clock and OLT synchronously, for the two layer function processing modules 1507 of the PON of OLT and the PON side of queuing buffer 1506 provide PON clock signal C lk1.
In this case, the two layer function processing modules 1507 of PON, from queuing buffer 1506, obtain the PON data link layer frame from EB that transmits by PSN tunnel, this PON data link layer frame is carried out the PON data link layer deals after, send to the IP fringe node; Perhaps, receive the PON data link layer frame that the user sends over, this PON data link layer frame is carried out sending to queuing buffer 1506 after the PON data link layer deals.
In this case, PON over ETH processing module 1505, be used for obtaining PON data link layer frame from queuing buffer 1506, finish the payload encapsulation process that PON data link layer frame is mapped to corresponding ethernet frame, the ethernet frame that obtains is sent to VPLS transponder 1504; Receive the ethernet frame that VPLS transponder 1504 sends, this ethernet frame is carried out the Ethernet payload decapsulation process obtain PON data link layer frame, send PON data link layer frame to queuing buffer 1506.
In this case, PSN tunnel processing module 1502 receives the PW-PDU from PW processing module 1503, and this PW-PDU is packaged in PSN tunnel, passes to network side interface processing module 1501; Perhaps, the data message from network side interface processing module 1501 is carried out the PSN tunnel decapsulation process, obtain PW-PDU, this PW-PDU is sent to PW processing module 1503.
In this case, PW processing module 1503, be used for obtaining ethernet frame from PON over ETH processing module 1505, finish the payload encapsulation process and the PW multiplex process that ethernet frame are mapped to corresponding PW, the PW-PDU that obtains is sent to PSN tunnel processing module 1502; Receive the PW-PDU that PSN tunnel processing module 1502 sends, this PW-PDU is carried out the decapsulation of PW payload and PW demultiplexing, obtain ethernet frame, send this ethernet frame to PON over ETH processing module 1505.
Further, when above-mentioned ETH was VPLS/VPWS, the OLT among this embodiment can also comprise:
Above-mentioned EB is identical with above-described embodiment two with PON clock synchronous scheme between OLT.
In sum, the embodiment of the invention is by increasing EB at optical transmission pathway, only the terminate physical layer function of PON of EB, but the data link layer functions of the PON that do not terminate, the data link layer of PON is zoomed out the position of IP fringe node (as zoom out) by the PSN network, realized the PON transmission of long distance.The embodiment of the invention has reduced the again input cost of long distance P ON transmission, so that up-front investment has obtained protection owing to take full advantage of original PSN network among the PON.
The above; only for the better embodiment of the present invention, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (14)
1. PSN tunnel processing unit, it is characterized in that, the extender equipment EB that described PSN tunnel processing unit increases for optical network unit ODN and the optical transmission pathway between the OLT at PON, be arranged at least one end at two ends of the packet network PSN tunnel of PON, between the ODN and IP fringe node of described PSN tunnel in PON, described PSN tunnel processing unit comprises:
The PSN tunnel processing module is used for the PON data link layer frame that reception need to send to the opposite end of described PSN tunnel, this PON data link layer frame is packaged in PSN tunnel obtains data message, this data message is sent to the opposite end of described PSN tunnel; Perhaps, receive the data message that the opposite end of described PSN tunnel sends over by described PSN tunnel, this data message is carried out the PSN tunnel decapsulation obtain PON data link layer frame, this PON data link layer frame is sent.
2. PSN tunnel processing unit according to claim 1 is characterized in that, described EB also comprises: PON PLIM and network side interface processing module; Described PON PLIM is connected with ODN, and described network side interface processing module is connected with OLT by the PSN network; Then described PSN tunnel processing module is receiving the PON data link layer frame that sends over from the PON PLIM, this PON data link layer frame is packaged in PSN tunnel after, send to OLT by described network side interface processing module;
Perhaps, described PSN tunnel processing module receives the data message that sends over from network side interface processing module, this data message is carried out the PSN tunnel decapsulation to be processed, obtain PON data link layer frame, this PON data link layer frame is sent to described ODN by described PON PLIM.
3. PSN tunnel processing unit according to claim 2 is characterized in that, described EB also comprises PON over PW processing module,
Described PON over PW processing module is after receiving the PON data link layer frame that sends over from the PON PLIM, this PON data link layer frame is carried out PW payload encapsulation and PW be mapped to corresponding pseudo-line PW after multiplexing, obtain PW-PDU, this PW-PDU is sent to the PSN tunnel processing module carry out encapsulation process;
Perhaps, described PON over PW processing module receives from what described PSN tunnel processing module sended over carries out PW-PDU after the decapsulation, this PW-PDU is carried out the decapsulation of PW payload and PW demultiplexing, obtain PON data link layer frame, this PON data link layer frame is sent to the PON PLIM.
4. PSN tunnel processing unit according to claim 2 is characterized in that, described EB also comprises: PON over ETH processing module,
Described PON over ETH processing module is after receiving the PON data link layer frame that sends over from the PON PLIM, this PON data link layer frame is mapped to the payload of corresponding ethernet frame, the ethernet frame that obtains is sent to the PSN tunnel processing module;
Perhaps, described PON over ETH processing module receives from what the PSN tunnel processing module sended over carries out ethernet frame after the decapsulation, this ethernet frame is carried out the Ethernet payload decapsulation obtain PON data link layer frame, this PON data link layer frame is sent to the PON PLIM.
5. PSN tunnel processing unit according to claim 1, it is characterized in that, described PSN tunnel processing unit is arranged among the OLT, described OLT also comprises: the two layer function processing modules of user side interface processing module and PON, described user side interface processing module is connected with EB by PSN tunnel, and the two layer function processing modules of described PON are connected with the user; Then described PSN tunnel processing module is carried out PSN tunnel decapsulation processing to the data message that sends over from the user side interface processing module, obtain PON data link layer frame, the two layer function processing modules of this PON data link layer frame by described PON are sent;
Perhaps, described PSN tunnel processing module after receiving the PON data link layer frame that sends over from the two layer function processing modules of PON, this PON data link layer frame is packaged in PSN tunnel after, send to EB by described user side interface processing module.
6. PSN tunnel processing unit according to claim 5 is characterized in that, described OLT also comprises:
PON over PW processing module, receiving the PON data link layer frame that sends over from the two layer function processing modules of PON, this PON data link layer frame is carried out PW payload encapsulation and PW be mapped to corresponding PW after multiplexing, obtain PW-PDU, this PW-PDU is sent to the PSN tunnel processing module carry out encapsulation process;
Perhaps, described PON over PW processing module receives the PW-PDU that sends over from the PSN tunnel processing module, this PW-PDU is carried out the decapsulation of PW payload and PW demultiplexing, obtain PON data link layer frame, this PON data link layer frame is sent to the two layer function processing modules of PON.
7. PSN tunnel processing unit according to claim 5 is characterized in that, described OLT also comprises:
PON over ETH processing module, reception is carried out data message after the decapsulation from what the PSN tunnel processing module sended over, this data message is carried out the Ethernet payload decapsulation obtain PON data link layer frame, this PON data link layer frame is sent to the two layer function processing modules of PON;
Perhaps, described PON over ETH processing module receives the PON data link layer frame that sends over from the two layer function processing modules of PON, this PON data link layer frame is mapped to the payload of corresponding ethernet frame, the ethernet frame that obtains is sent to the PSN tunnel processing module.
8. PSN tunnel processing unit according to claim 1 is characterized in that, described PSN tunnel processing unit also comprises:
Queuing buffer is used for when receiving the data message that sends over by PSN tunnel from the opposite end of described PSN tunnel, and this data message is transmitted in PSN tunnel and the jitter and wander that brings compensates;
Perhaps, the PON clock synchronization module, be used for and the opposite end of described PSN tunnel between carry out the PON clock synchronously.
9. a PON is carried on the system of PW, it is characterized in that, comprise: such as each described EB of claim 2 to 4 with such as each described OLT of claim 5 to 7, transmit mutually the data link layer frame of PON between described EB and the described OLT by the packet network PSN tunnel.
10. the remote transmission method of a PON is characterized in that, described method specifically comprises:
The extender equipment EB that increases by optical network unit ODN and the optical transmission pathway between the OLT at PON receives the PON data link layer frame that sends over from ODN, send to OLT after this PON data link layer frame is packaged in the packet network PSN tunnel, the described PON data link layer that wherein is packaged in PSN tunnel can be by described OLT decapsulation;
Or the EB that increases by ODN and the optical transmission pathway between the OLT at PON receives the PON data link layer frame that is packaged in PSN tunnel that sends over from OLT, carries out decapsulation and obtains sending to ODN behind the described PON data link layer frame.
11. the remote transmission method of PON according to claim 10 is characterized in that, described this PON data link layer frame is packaged in sends to OLT behind the PSN tunnel and comprises:
This PON data link layer frame is carried out PW payload encapsulation and PW be mapped to corresponding PW after multiplexing, obtain PW-PDU, obtain data message after this PW-PDU is packaged in PSN tunnel, this data message is sent to OLT by the PSN network; Then the described described PON data link layer that is packaged in PSN tunnel can be comprised by described OLT decapsulation: described OLT carries out first the PSN tunnel decapsulation to be processed, obtain PW-PDU, this PW-PDU is carried out the decapsulation of PW payload and PW demultiplexing, obtain PON data link layer frame.
12. the remote transmission method of PON according to claim 10, it is characterized in that, the described PON data link layer frame that has been packaged in PSN tunnel is to be mapped to corresponding PW after multiplexing through PW payload encapsulation and PW, obtain PW-PDU, this PW-PDU is packaged in the data message that obtains behind the PSN tunnel;
Then describedly carry out decapsulation and obtain described PON data link layer frame and comprise: this data message is carried out the PSN tunnel decapsulation process, obtain PW-PDU, this PW-PDU is carried out the decapsulation of PW payload and PW demultiplexing, obtain PON data link layer frame.
13. the remote transmission method of PON according to claim 10 is characterized in that, described this PON data link layer frame is packaged in sends to OLT behind the PSN tunnel and comprises:
This PON data link layer frame is mapped to the payload of corresponding ethernet frame, obtain ethernet frame, this ethernet frame is carried out PW payload encapsulation and PW be mapped to corresponding PW after multiplexing, the PW-PDU that obtains put into obtain data message after being packaged in PSN tunnel, this data message is sent to OLT by the PSN network;
Then the described described PON data link layer that is packaged in PSN tunnel can be comprised by described OLT decapsulation: described OLT carries out first the PSN tunnel decapsulation to be processed, obtain PW-PDU, this PW-PDU is carried out the decapsulation of PW payload and PW demultiplexing, obtain ethernet frame, this ethernet frame is carried out the Ethernet payload decapsulation obtain PON data link layer frame.
14. the remote transmission method of PON according to claim 10 is characterized in that,
The described PON data link layer frame that has been packaged in PSN tunnel is the payload that is mapped to corresponding ethernet frame, after obtaining ethernet frame, this ethernet frame is carried out PW payload encapsulation and PW be mapped to corresponding PW after multiplexing, obtain PW-PDU, this PW-PDU is packaged in the data message that obtains behind the PSN tunnel;
Then describedly carry out decapsulation and obtain described PON data link layer frame and comprise: this data message is carried out the PSN tunnel decapsulation process, obtain PW-PDU, this PW-PDU is carried out the decapsulation of PW payload and the PW demultiplexing obtains ethernet frame, this ethernet frame is carried out the Ethernet payload decapsulation obtain described PON data link layer frame.
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| EP2553861B1 (en) * | 2010-03-29 | 2019-03-20 | Telefonaktiebolaget LM Ericsson (publ) | Methods and arrangements in optical network |
| US8472438B2 (en) * | 2010-04-23 | 2013-06-25 | Telefonaktiebolaget L M Ericsson (Publ) | Efficient encapsulation of packets transmitted on a packet-pseudowire over a packet switched network |
| CN102281100B (en) * | 2010-06-12 | 2016-02-24 | 中兴通讯股份有限公司 | Long method and the device realizing light path detection in EPON |
| CN102655469B (en) * | 2011-03-01 | 2016-08-10 | 中兴通讯股份有限公司 | A kind of network equipment realizing differential clock equipment communication and system and method |
| CN102209036B (en) * | 2011-05-26 | 2015-03-25 | 华为技术有限公司 | Generalized multi-protocol label switching (GMPLS) protocol message processing method, device and system |
| CN102868610B (en) * | 2012-09-07 | 2016-06-15 | 华为技术有限公司 | Data transmission method, the first operator's edge router and system |
| US9485199B2 (en) * | 2013-02-28 | 2016-11-01 | Broadcom Corporation | System and method for data flow identification and alignment in a 40/100 gigabit ethernet gearbox |
| US10256910B2 (en) * | 2017-04-24 | 2019-04-09 | Futurewei Technologies, Inc. | Control and management of passive optical network reach extenders |
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