CN105357597A - Passive optical network, data transmission method and data transmission device - Google Patents
Passive optical network, data transmission method and data transmission device Download PDFInfo
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- CN105357597A CN105357597A CN201510634771.0A CN201510634771A CN105357597A CN 105357597 A CN105357597 A CN 105357597A CN 201510634771 A CN201510634771 A CN 201510634771A CN 105357597 A CN105357597 A CN 105357597A
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- 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
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/27—Arrangements for networking
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
- H04Q2213/1301—Optical transmission, optical switches
Abstract
The invention discloses a passive optical network, a data transmission method and a data transmission device, and relates to the technical field of optical communication networks. The passive optical network, the data transmission method and the data transmission device are used for solving a problem of inconvenience of the PON (Passive Optical Network) caused when a single-mode ONU (Optical Network Unit) device is used and relatively high cost caused when a dual-mode ONU device is used in the prior art. The passive optical network comprises an optical line terminal, an optical switch, an optical distribution network and the optical network unit, wherein the optical line terminal comprises at least one EPON (Ethernet Passive Optical Network) interface and at least one GPON (Gigabit Passive Optical Network) interface; each EPON interface and each GPON interface both are connected with the optical switch; the optical switch is connected with at least one optical distribution network; and each optical distribution network is connected with at least one optical network unit. The passive optical network, the data transmission method and the data transmission device are used in a network process of the PON.
Description
Technical field
The present invention relates to optical communication network technology field, particularly relate to a kind of passive optical-fiber network, the method for transfer of data and device.
Background technology
The emerging form of one that passive optical-fiber network (PassiveOpticalNetwork, PON) is existing broadband access network.PON is primarily of the optical line terminal (OpticalLineTerminal of central office, OLT) optical distribution network (OpticalDistributionNetwork of Passive Optical Components, is comprised, ODN) optical network unit (OpticalNetworkUnit, the ONU) composition of user side, is positioned at.Wherein, OLT comprises one or more EPON or GPON interface.Common PON as shown in Figure 1, is a kind of point-to-multipoint tree topology, and also namely each EPON or GPON interface of OLT101 connects ODN102, an ODN102 and connects multiple ONU103.
When utilizing existing PON to carry out transfer of data, the data from EPON interface in OLT only can communicate with the ONU equipment of the same EPON of having interface; Data from GPON interface in OLT only can communicate with the ONU equipment of the same GPON of having interface.Thus, the ONU type of user side and the interface type of OLT must be mapped, in a kind of way of realization of existing PON, adopt the form of single mode ONU, the chip being positioned at ONU only supports EPON interface or GPON interface, the type of all ONU be connected with same ODN like this must be identical, and this interface type is also wanted and consistent with the type of the interface of the OLT that this ODN is connected; Like this, when changing ONU equipment, need the same interface type changing OLT device; Therefore adopt in this way, networking is more inconvenient; For the ease of networking, in another way of realization of existing PON, adopt the form of bimodulus ONU, same chip in ONU equipment had both supported that EPON interface also supported GPON interface, so just without the need to limiting the interface type of OLT device, but the manufacturing cost of existing bimodulus ONU equipment is higher, if the single mode ONU equipment in existing network is all replaced with bimodulus ONU equipment, then cost is higher.
Summary of the invention
The invention provides a kind of passive optical-fiber network, the method for transfer of data and device, cost-saving while the networking of PON can be convenient to.
For achieving the above object, the present invention adopts following technical scheme:
First aspect, the invention provides a kind of passive optical-fiber network, comprising: optical line terminal, optical switch, Optical Distribution Network and optical network unit, and wherein, described optical line terminal comprises at least one EPON interface and at least one GPON interface; Each described EPON interface is all connected with described optical switch with described GPON interface; Described optical switch is connected with at least one Optical Distribution Network; Each described Optical Distribution Network is connected with optical network unit described at least one;
Described optical switch is used for forwarding packet from described Optical Distribution Network according to the time-slot sequence of packet to described EPON interface and/or described GPON interface; Also forward packet from described EPON interface and GPON interface for the time-slot sequence according to packet to all described Optical Distribution Networks.
Second aspect, present invention also offers a kind of method of transfer of data, is applied to the passive optical-fiber network described in first aspect, comprises:
Described optical switch receives at least one packet that all described Optical Distribution Networks send;
Obtain the time slot sign in each described packet;
According to the time slot sign of described packet, obtain the time-slot sequence of described packet;
Packet is sent respectively to the described EPON interface on described optical line terminal and/or GPON interface according to time-slot sequence;
And/or
Described optical switch receives at least one packet that on described optical line terminal, each described EPON interface and GPON interface send;
Obtain the time slot sign in each described packet;
According to the time slot sign of described packet, obtain the time-slot sequence of described packet;
Packet is sent respectively to all optical distribution networks according to time-slot sequence.
The third aspect, present invention also offers a kind of device of transfer of data, is applied to the passive optical-fiber network described in first aspect, comprises:
Receiving element, for receiving at least one packet that all described Optical Distribution Networks send;
Acquiring unit, for obtaining the time slot sign in each described packet;
Processing unit, for the time slot sign according to described packet, obtains the time-slot sequence of packet;
Transmitting element, for sending packet according to time-slot sequence respectively to the EPON interface on described optical line terminal and/or GPON interface; ;
And/or
Described receiving element, also at down direction, receives at least one packet that on described optical line terminal, each described EPON interface and GPON interface send;
Described acquiring unit, also for obtaining the time slot sign in each described packet;
Described processing unit, also for the time slot sign according to described packet, obtains the time-slot sequence of packet;
Described transmitting element, also for sending packet according to time-slot sequence respectively to all optical distribution networks.
The passive optical-fiber network that the embodiment of the present invention provides, on the basis of existing PON framework and the network equipment, add optical switch, this optical switch can either be connected with all types of interfaces of OLT device, also can be connected with all ODN.Like this, from all data of OLT device, no matter be all sent to all ODN by this optical switch by the data of EPON interface or GPON interface, and be broadcast to all ONU equipment by ODN.With when adopting single mode ONU equipment in prior art, compared with all ONU be connected of same ODN and the interface of OLT device that is connected with this ODN all need to be consistent, as long as there is EPON interface and GPON interface in OLT in the present invention simultaneously, then without the need to limiting the type of the ONU that user side connects, when changing the type of ONU equipment of user side, without the need to changing the interface type in OLT; Thus the networking of PON and the replacing of equipment can be convenient to.With when adopting bimodulus ONU equipment in prior art, cost is higher to be compared, and the present invention only needs to increase optical switch, and without the need to changing the single mode ONU in existing network, thus realizes cost lower.In sum, reduce while passive optical-fiber network provided by the invention can be convenient to networking and realize cost.
Accordingly, present invention also offers method and the device of the transfer of data being applied to this passive optical-fiber network, optical switch carries out the forwarding of packet according to the time-slot sequence of packet, successfully can realize the transmission of packet.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the configuration diagram of PON of the prior art;
The configuration diagram of the PON that Fig. 2 provides for the embodiment of the present invention;
The schematic flow sheet of the method for a kind of transfer of data that Fig. 3 provides for the embodiment of the present invention;
The schematic flow sheet of the another kind of data transmission method that Fig. 4 provides for the embodiment of the present invention;
The schematic flow sheet of another data transmission method that Fig. 5 provides for the embodiment of the present invention;
The structural representation of a kind of data transmission device that Fig. 6 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the present embodiment, be clearly and completely described the technical scheme in the present embodiment, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiments provide a kind of passive optical-fiber network, as shown in Figure 2, comprise: optical line terminal 201, optical switch 202, Optical Distribution Network 203 and optical network unit 204, wherein, described optical line terminal 201 comprises at least one EPON interface and at least one GPON interface; Each described EPON interface is all connected with described optical switch 202 with described GPON interface; Described optical switch 202 is connected with at least one Optical Distribution Network 203; Each described Optical Distribution Network 203 is connected with optical network unit described at least one 204.Described optical switch is used for forwarding packet from described Optical Distribution Network according to the time-slot sequence of packet to described EPON interface and/or described GPON interface; Also forward packet from described EPON interface and GPON interface for the time-slot sequence according to packet to all described Optical Distribution Networks.
Wherein, OLT is a kind of rack-mount unit, can insert multiple EPON or GPON circuit board, each EPON or GPON circuit board can have 4 or 8 EPON or GPON interfaces.
Optical switch is a high performance managed switches, it is a kind of Internet Transmission trunking of high speed, it comparatively general switch have employed fiber optic cables as transmission medium, the exchanges data of light signal can be carried out, the reliability of network can be ensured and signal route platform is flexibly provided.Optical switch in the embodiment of the present invention can be the configuration of full optical port or the configuration of photoelectricity port hybrid, the optional monomode fiber of incoming fiber optic medium or multimode fiber.This optical switch can simultaneously network enabled telemanagement and local management to realize the monitoring of port operating state and the setting of switch.
In a kind of implementation of the embodiment of the present invention, described optical switch is full optical port switch, and each described EPON with the GPON interface of optical line terminal is connected with described optical switch by optical fiber; Described Optical Distribution Network is connected with described optical switch by optical fiber.
The passive optical-fiber network that the embodiment of the present invention provides, on the basis of existing PON framework and the network equipment, add optical switch, this optical switch can either be connected with all types of interfaces of OLT device, also can be connected with all ODN.Like this, from all data of OLT device, no matter be all sent to all ODN by this optical switch by the data of EPON interface or GPON interface, and be broadcast to all ONU equipment by ODN.With when adopting single mode ONU equipment in prior art, compared with all ONU be connected of same ODN and the interface of OLT device that is connected with this ODN all need to be consistent, as long as there is EPON interface and GPON interface in OLT in the present invention simultaneously, then without the need to limiting the type of the ONU that user side connects, when changing the type of ONU equipment of user side, without the need to changing the interface type in OLT; Thus the networking of PON and the replacing of equipment can be convenient to.With when adopting bimodulus ONU equipment in prior art, cost is higher to be compared, and the present invention only needs to increase optical switch, and without the need to changing the single mode ONU in existing network, thus realizes cost lower.In sum, reduce while passive optical-fiber network provided by the invention can be convenient to networking and realize cost.
The above-mentioned passive optical-fiber network that the embodiment of the present invention provides, owing to adding optical switch, and optical switch may receive packet that all ONU of being positioned at user side are sent by ODN or the data that OLT is sent by all EPON interfaces or GPON interface, in order to avoid conflict, optical switch needs to forward according to certain time-slot sequence.
Therefore, the embodiment of the present invention additionally provides a kind of method of transfer of data, comprises the transfer of data of up direction and down direction, and the transfer of data of up direction as shown in Figure 3, comprising:
301: described optical switch receives at least one packet that all described Optical Distribution Networks send.
Wherein, the packet that the ODN of indication sends is the ONU equipment from the user side be connected with this ODN.
302: obtain the time slot sign in each described packet.
303: according to the time slot sign of described packet, obtain the time-slot sequence of described packet.
Generally speaking, the time slot sign of each packet is different, thus can sort to packet according to time slot sign, obtain the time-slot sequence of packet.
304: send packet according to time-slot sequence respectively to the EPON interface on described optical line terminal and/or GPON interface.
After each interface to packet, according to the Media Access Controlled (MACMediumAccessControl of packet, or sequence number (SerialNumber MAC), SN) or logic ONU identify (LogicalONUIdentifier, and LLID (LogicalLinkIdentifier LOID), LLID) confirm whether this packet is the packet sending to oneself, if it is processes, otherwise abandons.
The transfer of data of down direction, as shown in Figure 4, comprising:
401: described optical switch receives at least one packet that on described optical line terminal, each described EPON interface and GPON interface send.
402: obtain the time slot sign in each described packet.
403: according to the time slot sign of described packet, obtain the time-slot sequence of described packet.
404: send packet according to time-slot sequence respectively to all optical distribution networks.
Each packet is forwarded to its optical network unit connected by optical distribution network again, so that optical network unit carries out identifying and processing according to MAC or SN of packet or LOID and LLID.
Therefore, no matter be up direction or down direction, optical switch all will according to the time-slot sequence forwarding data bag of packet.
The method of the above-mentioned transfer of data that the embodiment of the present invention provides, on the basis of the PON that can provide in the embodiment of the present invention, realizes the Successful transmissions of packet.
In addition, two layers of frame structure (hereinafter referred EPONMAC) of the packet sent by user side EPONONU adopt Ethernet packaged type, and two layers of frame structure (hereinafter referred GPONMAC) of the packet sent by user side GPONONU adopt GEM/ATM packaged type.Though EPONMAC frame structure is based on the basic frame structure of IEEE802.3 Ethernet, but made encapsulation amendment to PreambleSFD, concrete modification is as shown in following table table one:
Table one
From upper table table one, amended EPONMAC frame is revised as 0xd5 at SLD byte value.For this characteristic, optical switch increases EPON/GPON identifying processing unit, mainly for the treatment of the data flow of up direction, up direction after obtaining the process of time slot sign by the SLD position of each packet of this EPON/GPON identifying processing unit comparison, if its value is 0xd5, then packet is forwarded to the EPON interface in OLT device, otherwise packet is forwarded to the GPON interface in OLT device.
Therefore, when up direction carries out transfer of data, in order to improve the efficiency of data retransmission, optical switch, except carrying out data retransmission according to time-slot sequence to OLT device, can also distinguish only forward to the EPON interface in OLT device or GPON interface to packet.Therefore, described step 304 " sends packet according to time-slot sequence to the EPON interface on described optical line terminal and/or GPON interface " respectively, as shown in Figure 5, specifically comprises:
501: the value obtaining SLD field in each described packet.
502: when the value of described SLD field is the first value, send packet according to time-slot sequence respectively to the EPON interface on described optical line terminal.
Wherein, this first value is 0xd5.
503: when the value of described SLD field is the second value, send packet according to time-slot sequence respectively to the GPON interface on described optical line terminal.
Wherein, this second value is 0x55.
In addition, no matter be up direction, or down direction, in the process that packet forwards, the situation that the time slot of a few packets is identical may be there is, then described according to time-slot sequence transmission packet, specifically comprise:
If there are at least two packets that time slot sign is identical, then the precedence field of each packet at least two packets described in obtaining;
At least two packets described in sending respectively according to priority order from high to low.
Equally, except time-slot sequence is identical, the value that also may there is the precedence field of a few packets is also identical, is also the packet of same priority, at least two packets described in sending respectively according to priority order from high to low then, specifically also comprise:
If there are at least two packets that time slot sign is all identical with priority, then send at random.
As the specific implementation of said method, the embodiment of the present invention additionally provides a kind of device of transfer of data, is applied to the described passive optical-fiber network that the embodiment of the present invention provides, is mainly arranged in the optical switch of described passive optical-fiber network, as shown in Figure 6, specifically comprise:
Receiving element 601, at up direction, receives at least one packet that all described Optical Distribution Networks send;
Acquiring unit 602, for obtaining the time slot sign in each described packet;
Processing unit 603, for the time slot sign according to described packet, obtains the time-slot sequence of packet;
Transmitting element 604, for sending packet according to time-slot sequence respectively to the EPON interface on described optical line terminal and/or GPON interface;
And/or
Described receiving element 601, also at down direction, receives at least one packet that on described optical line terminal, each described EPON interface and GPON interface send;
Described acquiring unit 602, also for obtaining the time slot sign in each described packet;
Described processing unit 603, also for the time slot sign according to described packet, obtains the time-slot sequence of packet;
Described transmitting element 604, also for sending packet according to time-slot sequence respectively to all optical distribution networks.
Further, described transmitting element 604, specifically also for:
Obtain the value of SLD field in each described packet;
When the value of described SLD field is the first value, send packet respectively to the EPON interface on described optical line terminal;
When the value of described SLD field is the second value, send packet respectively to the GPON interface on described optical line terminal.
Further, described transmitting element 604, specifically for:
During at least two packets that gap mark is identical when it is present, the precedence field of each packet at least two packets described in acquisition;
At least two packets described in sending respectively according to priority order from high to low.
Further, described transmitting element 604, specifically also for:
During at least two packets that gap mark and priority are all identical when it is present, send at random.
The device of the transfer of data that the embodiment of the present invention provides, the basis of the EPON that can provide in the embodiment of the present invention realizes the successful forwarding of data.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that the present invention can add required common hardware by software and realize, and can certainly pass through hardware, but in a lot of situation, the former is better execution mode.Based on such understanding, technical scheme of the present invention can embody with the form of software product the part that prior art contributes in essence in other words, this computer software product is stored in the storage medium that can read, as the floppy disk of computer, hard disk or CD etc., comprise some instructions and perform method described in each embodiment of the present invention in order to make a computer equipment (can be personal computer, server, or the network equipment etc.).
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.
Claims (10)
1. a passive optical-fiber network, is characterized in that, comprising: optical line terminal, optical switch, Optical Distribution Network and optical network unit, and wherein, described optical line terminal comprises at least one EPON interface and at least one GPON interface; Each described EPON interface is all connected with described optical switch with described GPON interface; Described optical switch is connected with at least one Optical Distribution Network; Each described Optical Distribution Network is connected with optical network unit described at least one;
Described optical switch is used for forwarding packet from described Optical Distribution Network according to the time-slot sequence of packet to described EPON interface and/or described GPON interface; Also forward packet from described EPON interface and GPON interface for the time-slot sequence according to packet to all described Optical Distribution Networks.
2. passive optical-fiber network according to claim 1, is characterized in that, described optical switch is full optical port switch, and each described EPON with GPON interface is connected with described optical switch by optical fiber; Described Optical Distribution Network is connected with described optical switch by optical fiber.
3. a method for transfer of data, is applied to the passive optical-fiber network as described in any one of claim 1 or 2, it is characterized in that, comprising:
Described optical switch receives at least one packet that all described Optical Distribution Networks send;
Obtain the time slot sign in each described packet;
According to the time slot sign of described packet, obtain the time-slot sequence of described packet;
Packet is sent respectively to the EPON interface on described optical line terminal and/or GPON interface according to time-slot sequence;
And/or
Described optical switch receives at least one packet that on described optical line terminal, each described EPON interface and GPON interface send;
Obtain the time slot sign in each described packet;
According to the time slot sign of described packet, obtain the time-slot sequence of described packet;
Packet is sent respectively to all optical distribution networks according to time-slot sequence.
4. method according to claim 3, is characterized in that, describedly sends packet according to time-slot sequence respectively to the EPON interface on described optical line terminal and/or GPON interface, specifically comprises:
Obtain the value of SLD field in each described packet;
When the value of described SLD field is the first value, send packet according to time-slot sequence respectively to the EPON interface on described optical line terminal;
When the value of described SLD field is the second value, send packet according to time-slot sequence respectively to the GPON interface on described optical line terminal.
5. the method according to claim 3 or 4, is characterized in that, described according to time-slot sequence transmission packet, specifically comprises:
If there are at least two packets that time slot sign is identical, then the precedence field of each packet at least two packets described in obtaining;
At least two packets described in sending respectively according to priority order from high to low.
6. method according to claim 5, is characterized in that, described send respectively according to priority order from high to low described at least two packets, specifically also comprise:
If there are at least two packets that time slot sign is all identical with priority, then send at random.
7. a device for transfer of data, is applied to passive optical-fiber network as claimed in claim 1 or 2, it is characterized in that, comprising:
Receiving element, for receiving at least one packet that all described Optical Distribution Networks send;
Acquiring unit, for obtaining the time slot sign in each described packet;
Processing unit, for the time slot sign according to described packet, obtains the time-slot sequence of packet;
Transmitting element, for sending packet according to time-slot sequence respectively to the EPON interface on described optical line terminal and/or GPON interface;
And/or
Described receiving element, also for receiving at least one packet that on described optical line terminal, each described EPON interface and GPON interface send;
Described acquiring unit, also for obtaining the time slot sign in each described packet;
Described processing unit, also for the time slot sign according to described packet, obtains the time-slot sequence of packet;
Described transmitting element, also for sending packet according to time-slot sequence respectively to all optical distribution networks.
8. device according to claim 7, is characterized in that, described transmitting element, specifically also for:
Obtain the value of SLD field in each described packet;
When the value of described SLD field is the first value, send described packet to the described EPON interface on described optical line terminal;
When the value of described SLD field is the second value, send described packet to the described GPON interface on described optical line terminal.
9. the device according to claim 7 or 8, is characterized in that, described transmitting element, specifically for:
During at least two packets that gap mark is identical when it is present, the precedence field of each packet at least two packets described in acquisition;
At least two packets described in sending respectively according to priority order from high to low.
10. device according to claim 9, is characterized in that, described transmitting element, specifically also for:
During at least two packets that gap mark and priority are all identical when it is present, send at random.
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