CN105357597B - A kind of passive optical-fiber network, data transmission method and device - Google Patents
A kind of passive optical-fiber network, data transmission method and device Download PDFInfo
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- CN105357597B CN105357597B CN201510634771.0A CN201510634771A CN105357597B CN 105357597 B CN105357597 B CN 105357597B CN 201510634771 A CN201510634771 A CN 201510634771A CN 105357597 B CN105357597 B CN 105357597B
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000005540 biological transmission Effects 0.000 title claims description 38
- 230000003287 optical effect Effects 0.000 claims abstract description 126
- 238000009826 distribution Methods 0.000 claims abstract description 32
- 238000012545 processing Methods 0.000 claims description 9
- 230000006855 networking Effects 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000004891 communication Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 239000000835 fiber Substances 0.000 description 5
- 238000012986 modification Methods 0.000 description 2
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- 238000004364 calculation method Methods 0.000 description 1
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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
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Abstract
The invention discloses the method and devices that a kind of passive optical-fiber network, data are transmitted, and are related to optical communication network technology field.When in order to solve use single mode ONU equipment existing in the prior art, PON network is inconvenient；When using bimodulus ONU equipment, the problem of higher cost.Wherein, passive optical-fiber network, comprising: optical line terminal, optical switch, Optical Distribution Network and optical network unit, wherein the optical line terminal includes at least one EPON and at least one GPON interface；Each EPON interface and GPON interface are connect with the optical switch；The optical switch is connect at least one Optical Distribution Network；Each Optical Distribution Network is connect with optical network unit described at least one.The present invention applies during the networking of PON network.
Description
Technical field
The present invention relates to optical communication network technology field more particularly to a kind of methods of passive optical-fiber network, data transmission
And device.
Background technique
Passive optical-fiber network (Passive Optical Network, PON) is a kind of emerging shape of existing broadband access network
Formula.PON is mainly by optical line terminal (Optical Line Terminal, OLT), the light comprising Passive Optical Components of central office
Distribute net (Optical Distribution Network, ODN), positioned at the optical network unit (Optical of user terminal
Network Unit, ONU) composition.Wherein, OLT includes one or more EPON or GPON interface.Common PON network is such as schemed
Shown in 1, each EPON or GPON interface for a kind of point-to-multipoint tree topology namely OLT101 connects one
ODN102, ODN102 connect multiple ONU103.
When being carried out data transmission using existing PON network, the data of EPON interface are only capable of and equally have in OLT
The ONU equipment of EPON interface is communicated；The data of GPON interface are only capable of and equally with the ONU of GPON interface in OLT
Equipment is communicated.Thus, the ONU type of user terminal and the interface type of OLT must be mapped, in existing PON network
In a kind of way of realization, using the form of single mode ONU, only support EPON interface or GPON interface positioned at the chip of ONU, in this way with
The type of the same ODN connected all ONU must be identical, and the interface type also want and with the interface of the ODN OLT being connected
Type it is consistent；In this way, needing equally to replace the interface type of OLT device when replacing ONU equipment；Therefore this side is used
Formula, networking are more inconvenient；For the ease of networking, in another way of realization of existing PON network, using bimodulus ONU
Form, the same chip in ONU equipment had both supported EPON interface or had supported GPON interface, thus without limiting OLT device
Interface type, but the manufacturing cost of existing bimodulus ONU equipment is higher, if the single mode ONU equipment in existing net replaced
It is changed to bimodulus ONU equipment, then higher cost.
Summary of the invention
The present invention provides the method and device of a kind of passive optical-fiber network, data transmission, can be convenient for the networking of PON network
While save the cost.
In order to achieve the above objectives, the present invention adopts the following technical scheme:
In a first aspect, the present invention provides a kind of passive optical-fiber networks, comprising: optical line terminal, optical switch, light distribution
Network and optical network unit, wherein the optical line terminal includes at least one EPON interface and at least one GPON interface；Often
A EPON interface and the GPON interface are connect with the optical switch；The optical switch and at least one light distribute
Network connection；Each Optical Distribution Network is connect with optical network unit described at least one；
The optical switch is used to turn according to the time-slot sequence of data packet to the EPON interface and/or the GPON interface
Send the data packet from the Optical Distribution Network；It is also used to turn according to the time-slot sequence of data packet to all Optical Distribution Networks
Send the data packet from the EPON interface and GPON interface.
Second aspect, the present invention also provides a kind of methods of data transmission, applied to passive light described in first aspect
Fibre web network, comprising:
The optical switch receives at least one data packet that all Optical Distribution Networks are sent；
Obtain the time slot sign in each data packet；
According to the time slot sign of the data packet, the time-slot sequence of the data packet is obtained；
Data are sent respectively according to the EPON interface of the time-slot sequence on the optical line terminal and/or GPON interface
Packet；
And/or
The optical switch receives each EPON interface and GPON interface on the optical line terminal and sends at least
One data packet；
Obtain the time slot sign in each data packet；
According to the time slot sign of the data packet, the time-slot sequence of the data packet is obtained；
Data packet is sent respectively to all optical distribution networks according to time-slot sequence.
The third aspect, the present invention also provides a kind of devices of data transmission, applied to passive light described in first aspect
Fibre web network, comprising:
Receiving unit, at least one data packet sent for receiving all Optical Distribution Networks；
Acquiring unit, for obtaining the time slot sign in each data packet；
Processing unit obtains the time-slot sequence of data packet for the time slot sign according to the data packet；
Transmission unit, for the EPON interface and/or GPON interface point according to time-slot sequence on the optical line terminal
It Fa Song not data packet；；
And/or
The receiving unit, is also used in down direction, receive on the optical line terminal each EPON interface and
At least one data packet that GPON interface is sent；
The acquiring unit is also used to obtain the time slot sign in each data packet；
The processing unit is also used to the time slot sign according to the data packet, obtains the time-slot sequence of data packet；
The transmission unit is also used to send data packet respectively to all optical distribution networks according to time-slot sequence.
Passive optical-fiber network provided in an embodiment of the present invention, on the basis of existing PON network framework and the network equipment,
Optical switch is increased, which can either connect with all types of interfaces of OLT device, also can be with all ODN
Connection.In this way, all data from OLT device, either can be passed through by the data of EPON interface or GPON interface
The optical switch is sent to all ODN, and is broadcasted by ODN to all ONU equipments.With in the prior art use single mode ONU set
When standby, with connected all ONU of same ODN and compared with the interface of the ODN OLT device being connected is required to be consistent,
As long as existing simultaneously EPON interface and GPON interface in the present invention in OLT, without limiting the class for the ONU that user side is connected
Type, the interface type when replacing the type of ONU equipment of user side, in no replacement is required OLT；PON network can be thus convenient for
Networking and equipment replacement.When with using bimodulus ONU equipment in the prior art, higher cost is compared, present invention only requires
Increase optical switch, without replacing to the single mode ONU in existing net, thus cost of implementation is lower.In conclusion of the invention
The passive optical-fiber network of offer can be convenient for reducing cost of implementation while networking.
Correspondingly, the present invention also provides the method and device that the data for being applied to the passive optical-fiber network are transmitted, light is handed over
It changes planes and carries out the forwarding of data packet according to the time-slot sequence of data packet, can successfully realize the transmission of data packet.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the configuration diagram of PON network in the prior art；
Fig. 2 is the configuration diagram of PON network provided in an embodiment of the present invention；
Fig. 3 is a kind of flow diagram of the method for data transmission provided in an embodiment of the present invention；
Fig. 4 is the flow diagram of another data transmission method provided in an embodiment of the present invention；
Fig. 5 is the flow diagram of another data transmission method provided in an embodiment of the present invention；
Fig. 6 is a kind of structural schematic diagram of data transmission device provided in an embodiment of the present invention.
Specific embodiment
Below in conjunction with the attached drawing in the present embodiment, the technical solution in the present embodiment is clearly and completely described,
Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based in the present invention
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, all
Belong to the scope of protection of the invention.
The embodiment of the invention provides a kind of passive optical-fiber networks, as shown in Figure 2, comprising: optical line terminal 201, light are handed over
It changes planes 202, Optical Distribution Network 203 and optical network unit 204, wherein the optical line terminal 201 includes that at least one EPON connects
Mouth and at least one GPON interface；Each EPON interface and the GPON interface are connect with the optical switch 202；Institute
Optical switch 202 is stated to connect at least one Optical Distribution Network 203；Each Optical Distribution Network 203 with described at least one
Optical network unit 204 connects.The optical switch is used for the time-slot sequence according to data packet to the EPON interface and/or described
GPON interface forwards the data packet from the Optical Distribution Network；Time-slot sequence according to data packet is also used to all light
Distribute data packet of the forwarded from the EPON interface and GPON interface.
Wherein, OLT is a kind of rack-mounted device, and multiple EPON or GPON circuit boards, each EPON or GPON can be inserted
Can there are 4 or 8 EPON or GPON interfaces on circuit board.
Optical switch is a high performance managed switches, is a kind of network transmission trunking of high speed, it compared with
Fiber optic cables are used for general switch as transmission medium, can be carried out the data exchange of optical signal, can be guaranteed net
The reliability and the flexible signal route platform of offer of network.Optical switch in the embodiment of the present invention can configure for full optical port
Or the configuration of photoelectricity port hybrid, the optional single mode optical fiber of incoming fiber optic medium or multimode fibre.The optical switch can support net simultaneously
Network remotely manages and local management is to realize the monitoring to port working condition and the setting of interchanger.
In an implementation of the embodiment of the present invention, the optical switch is full optical port interchanger, and optical link is whole
Each of the end EPON and GPON interface is connect by optical fiber with the optical switch；The Optical Distribution Network by optical fiber with
The optical switch connection.
Passive optical-fiber network provided in an embodiment of the present invention, on the basis of existing PON network framework and the network equipment,
Optical switch is increased, which can either connect with all types of interfaces of OLT device, also can be with all ODN
Connection.In this way, all data from OLT device, either can be passed through by the data of EPON interface or GPON interface
The optical switch is sent to all ODN, and is broadcasted by ODN to all ONU equipments.With in the prior art use single mode ONU set
When standby, with connected all ONU of same ODN and compared with the interface of the ODN OLT device being connected is required to be consistent,
As long as existing simultaneously EPON interface and GPON interface in the present invention in OLT, without limiting the class for the ONU that user side is connected
Type, the interface type when replacing the type of ONU equipment of user side, in no replacement is required OLT；PON network can be thus convenient for
Networking and equipment replacement.When with using bimodulus ONU equipment in the prior art, higher cost is compared, present invention only requires
Increase optical switch, without replacing to the single mode ONU in existing net, thus cost of implementation is lower.In conclusion of the invention
The passive optical-fiber network of offer can be convenient for reducing cost of implementation while networking.
Above-mentioned passive optical-fiber network provided in an embodiment of the present invention, due to increasing optical switch, and optical switch may
It receives and all EPON interfaces or GPON interface is passed through by the ODN data packet sent or OLT positioned at all ONU of user terminal
The data of transmission, in order to avoid conflict, optical switch needs are forwarded according to certain time-slot sequence.
Therefore, the embodiment of the invention also provides a kind of methods of data transmission, including up direction and down direction
Data transmission, the data transmission of up direction, as shown in Figure 3, comprising:
301: the optical switch receives at least one data packet that all Optical Distribution Networks are sent.
Wherein, the data packet that signified ODN is sent is the ONU equipment from the user terminal being connected with the ODN.
302: obtaining the time slot sign in each data packet.
303: according to the time slot sign of the data packet, obtaining the time-slot sequence of the data packet.
In general, the time slot sign of each data packet is different, thus data packet can be ranked up according to time slot sign,
Obtain the time-slot sequence of data packet.
304: sending data respectively according to EPON interface of the time-slot sequence on the optical line terminal and/or GPON interface
Packet.
After each interface to data packet, according to Media Access Controlled (the MAC Medium Access of data packet
Control, MAC) or sequence number (Serial Number, SN) or logic ONU mark (Logical ONU Identifier,
LOID) and Logical link ID (Logical Link Identifier, LLID) confirms whether the data packet is to be sent to oneself
Data packet, if it is handled, otherwise abandoned.
The data of down direction are transmitted, as shown in Figure 4, comprising:
401: the optical switch receives what each EPON interface and GPON interface on the optical line terminal were sent
At least one data packet.
402: obtaining the time slot sign in each data packet.
403: according to the time slot sign of the data packet, obtaining the time-slot sequence of the data packet.
404: sending data packet respectively to all optical distribution networks according to time-slot sequence.
Each data packet is forwarded to its optical network unit connected again by optical distribution network, in order to optical network unit according to
The MAC or SN or LOID and LLID of data packet are identified and handled.
Therefore, either up direction or down direction, optical switch will be forwarded according to the time-slot sequence of data packet
Data packet.
The method of above-mentioned data transmission provided in an embodiment of the present invention, can be in PON network provided in an embodiment of the present invention
On the basis of, realize the Successful transmissions of data packet.
In addition, by user terminal EPON ONU send data packet two layers of frame structure (hereinafter referred EPON MAC) use with
Too net packaged type, and used by two layers of frame structure (hereinafter referred GPON MAC) of the user terminal GPON ONU data packet sent
GEM/ATM packaged type.Though EPON mac frame structure is based on the basic frame structure of IEEE802.3 Ethernet, to Preamble
SFD has made encapsulation modification, and concrete modification is as shown in following table table one:
Table one
By upper table table one as it can be seen that modified EPON mac frame is revised as 0xd5 in SLD byte value.For this characteristic,
Increase EPON/GPON identifying processing unit on optical switch, mainly for the treatment of the data flow of up direction, up direction passes through
The position SLD for comparing each data packet after the processing of acquisition time slot sign by the EPON/GPON identifying processing unit, if its value is
0xd5, then forward the packet to the EPON interface in OLT device, and the GPON otherwise forwarded the packet in OLT device connects
Mouthful.
Therefore, when up direction carries out data transmission, in order to improve the efficiency of data forwarding, optical switch in addition to according to
Time-slot sequence carries out data forwarding to OLT device, additionally it is possible to distinguish data packet with the EPON interface only in OLT device
Or GPON interface forwarding.Therefore, the step 304 " according to EPON interface of the time-slot sequence on the optical line terminal and/or
GPON interface sends data packet respectively ", as shown in figure 5, specifically including:
501: obtaining the value of SLD field in each data packet.
502: when the value of the SLD field is the first value, according to time-slot sequence on the optical line terminal
EPON interface sends data packet respectively.
Wherein, which is 0xd5.
503: when the value of the SLD field is the second value, according to time-slot sequence on the optical line terminal
GPON interface sends data packet respectively.
Wherein, which is 0x55.
In addition, either up direction or down direction, during data packet forwarding, in fact it could happen that certain is several
The identical situation of the time slot of data packet, then it is described to send data packet according to time-slot sequence, it specifically includes:
If there is identical at least two data packet of time slot sign, then every number at least two data packet is obtained
According to the precedence field of packet；
At least two data packet is sent respectively according to the sequence of priority from high to low.
Equally, other than time-slot sequence is identical, it is also possible to there are the value of the precedence field of a few a data packets is also identical,
Namely the data packet of same priority, then it is described to send at least two data respectively according to the sequence of priority from high to low
Packet, specifically further include:
If there is all identical at least two data packet of time slot sign and priority, then sent at random.
As the specific implementation of the above method, the embodiment of the invention also provides a kind of devices of data transmission, are applied to
The passive optical-fiber network provided in an embodiment of the present invention, the optical switch being predominantly located in the passive optical-fiber network, such as Fig. 6
It is shown, it specifically includes:
Receiving unit 601, for receiving at least one data that all Optical Distribution Networks are sent in up direction
Packet；
Acquiring unit 602, for obtaining the time slot sign in each data packet；
Processing unit 603 obtains the time-slot sequence of data packet for the time slot sign according to the data packet；
Transmission unit 604, for the EPON interface and/or GPON interface according to time-slot sequence on the optical line terminal
Data packet is sent respectively；
And/or
The receiving unit 601 is also used to receive each EPON interface on the optical line terminal in down direction
At least one data packet sent with GPON interface；
The acquiring unit 602 is also used to obtain the time slot sign in each data packet；
The processing unit 603, is also used to the time slot sign according to the data packet, obtains the time-slot sequence of data packet；
The transmission unit 604 is also used to send data packet respectively to all optical distribution networks according to time-slot sequence.
Further, the transmission unit 604, is specifically also used to:
Obtain the value of SLD field in each data packet；
When the value of the SLD field is the first value, the EPON interface on the optical line terminal sends number respectively
According to packet；
When the value of the SLD field is the second value, the GPON interface on the optical line terminal sends number respectively
According to packet.
Further, the transmission unit 604, is specifically used for:
When it is present when identical at least two data packet of gap mark, each data at least two data packet are obtained
The precedence field of packet；
At least two data packet is sent respectively according to the sequence of priority from high to low.
Further, the transmission unit 604, is specifically also used to:
When it is present gap mark and priority all identical at least two data packet when, sent at random.
The device of data transmission provided in an embodiment of the present invention, can be in passive optical network provided in an embodiment of the present invention
On the basis of realize that data successfully forwarded.
Through the above description of the embodiments, it is apparent to those skilled in the art that the present invention can borrow
Help software that the mode of required common hardware is added to realize, naturally it is also possible to which the former is more preferably by hardware, but in many cases
Embodiment.Based on this understanding, the portion that technical solution of the present invention substantially in other words contributes to the prior art
Dividing can be embodied in the form of software products, which stores in a readable storage medium, such as count
The floppy disk of calculation machine, hard disk or CD etc., including some instructions are used so that computer equipment (it can be personal computer,
Server or the network equipment etc.) execute method described in each embodiment of the present invention.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.
Claims (10)
1. a kind of passive optical-fiber network characterized by comprising optical line terminal, optical switch, Optical Distribution Network and optical-fiber network
Unit, wherein the optical line terminal includes at least one EPON interface and at least one GPON interface；Each EPON connects
Mouth and the GPON interface are connect with the optical switch；The optical switch is connect at least one Optical Distribution Network；Often
A Optical Distribution Network is connect with optical network unit described at least one；
The optical switch is used to forward to the EPON interface and/or the GPON interface according to the time-slot sequence of data packet
From the data packet of the Optical Distribution Network；It is also used to come according to the time-slot sequence of data packet to all Optical Distribution Network forwardings
From the data packet of the EPON interface and GPON interface.
2. passive optical-fiber network according to claim 1, which is characterized in that the optical switch is the exchange of full optical port
Machine, each EPON and GPON interface are connect by optical fiber with the optical switch；The Optical Distribution Network by optical fiber with
The optical switch connection.
3. a kind of method of data transmission, is applied to such as the described in any item passive optical-fiber networks of claims 1 or 2, feature
It is, comprising:
The optical switch receives at least one data packet that all Optical Distribution Networks are sent；
Obtain the time slot sign in each data packet；
According to the time slot sign of the data packet, the time-slot sequence of the data packet is obtained；
Data packet is sent respectively according to EPON interface of the time-slot sequence on the optical line terminal and/or GPON interface；
And/or
The optical switch receives at least one of each EPON interface and the transmission of GPON interface on the optical line terminal
Data packet；
Obtain the time slot sign in each data packet；
According to the time slot sign of the data packet, the time-slot sequence of the data packet is obtained；
Data packet is sent respectively to all optical distribution networks according to time-slot sequence.
4. according to the method described in claim 3, it is characterized in that, it is described according to time-slot sequence on the optical line terminal
EPON interface and/or GPON interface send data packet respectively, specifically include:
Obtain the value of SLD field in each data packet；
When the value of the SLD field is the first value, according to EPON interface of the time-slot sequence on the optical line terminal point
It Fa Song not data packet；
When the value of the SLD field is the second value, according to GPON interface of the time-slot sequence on the optical line terminal point
It Fa Song not data packet.
5. the method according to claim 3 or 4, which is characterized in that it is described to send data packet according to time-slot sequence, it is specific to wrap
It includes:
If there is identical at least two data packet of time slot sign, then each data packet at least two data packet is obtained
Precedence field；
At least two data packet is sent respectively according to the sequence of priority from high to low.
6. according to the method described in claim 5, it is characterized in that, described send respectively according to the sequence of priority from high to low
At least two data packet, specifically further include:
If there is all identical at least two data packet of time slot sign and priority, then sent at random.
7. a kind of device of data transmission, is applied to passive optical-fiber network as claimed in claim 1 or 2, which is characterized in that packet
It includes:
Receiving unit, at least one data packet sent for receiving all Optical Distribution Networks；
Acquiring unit, for obtaining the time slot sign in each data packet；
Processing unit obtains the time-slot sequence of data packet for the time slot sign according to the data packet；
Transmission unit, for being sent out respectively according to EPON interface of the time-slot sequence on the optical line terminal and/or GPON interface
Send data packet；
And/or
The receiving unit is also used to receive each EPON interface and GPON interface on the optical line terminal and sends extremely
A few data packet；
The acquiring unit is also used to obtain the time slot sign in each data packet；
The processing unit is also used to the time slot sign according to the data packet, obtains the time-slot sequence of data packet；
The transmission unit is also used to send data packet respectively to all optical distribution networks according to time-slot sequence.
8. device according to claim 7, which is characterized in that the transmission unit is specifically also used to:
Obtain the value of SLD field in each data packet；
When the value of the SLD field is the first value, the EPON interface on the optical line terminal sends the number
According to packet；
When the value of the SLD field is the second value, the GPON interface on the optical line terminal sends the number
According to packet.
9. device according to claim 7 or 8, which is characterized in that the transmission unit is specifically used for:
When it is present when identical at least two data packet of gap mark, each data packet at least two data packet is obtained
Precedence field；
At least two data packet is sent respectively according to the sequence of priority from high to low.
10. device according to claim 9, which is characterized in that the transmission unit is specifically also used to:
When it is present gap mark and priority all identical at least two data packet when, sent at random.
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| CN102149025A (en) * | 2010-02-04 | 2011-08-10 | 华为技术有限公司 | Interface matching method, device and system for PON (passive optical network) |
| CN102572619A (en) * | 2011-12-16 | 2012-07-11 | 中兴通讯股份有限公司 | PON (Passive Optical Network) system, OLT (Optical Line Terminal) and optical transmission method |
| WO2014189953A1 (en) * | 2013-05-20 | 2014-11-27 | Huawei Technologies Co., Ltd. | Cooperative multi-point (comp) in a passive optical network (pon) |
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