CN101110611A - Method and apparatus for echo wave filtering in EOC system - Google Patents
Method and apparatus for echo wave filtering in EOC system Download PDFInfo
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- CN101110611A CN101110611A CNA200710145933XA CN200710145933A CN101110611A CN 101110611 A CN101110611 A CN 101110611A CN A200710145933X A CNA200710145933X A CN A200710145933XA CN 200710145933 A CN200710145933 A CN 200710145933A CN 101110611 A CN101110611 A CN 101110611A
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Abstract
The present invention discloses a back wave filtration method in an EOC system including procedures below: A target LLID and a source LLID in a received message are acquired. The message is judged according to the source LLID and the target LLID. As an equipment corresponding to the target LLID comprises a principal equipment and the source LLID does not correspond to the principal equipment, the message is processed or discarded. The present invention also discloses a network equipment for back wave filtration in an EOC system. The present invention realizes back wave data filtration with a network equipment in a coaxial Ethernet system by adding a source LLID and a target LLID into a message.
Description
Technical field
The present invention relates to communication technical field, relate in particular to the echo wave filtering method and apparatus in a kind of EOC (Ethernet Over Coax is based on the Ethernet access of coaxial net) system.
Background technology
The coaxial cable carrier Ethernet is to be transmission medium with the coaxial cable, the function of integrated Ethernet switch and multiple spot control.Realize the subscriber household access, utilized the existing coaxial cable of cable TV network, with low cost.
Typical EOC system is made up of CLT (Coaxial Line Terminal, coaxial cable carrier Ethernet head end), CNU (Coaxial Network Unit, coaxial cable carrier ethernet terminal), branch distributor and coaxial cable.Use Multi-point Control Protocol to carry out communication between CLT and the CNU.The coaxial interface of a CLT equipment can articulate a plurality of CNU equipment by video branch, distributor, and wherein a kind of connected mode schematic diagram as shown in Figure 1.
Wherein, the last behavior GE of CLT (Gigabit Ethernet, the Ethernet of 1000M transmission rate) mouthful, data flow is an ethernet frame., transmit on existing coaxial cable TV signal and the synthetic blended data stream of Ethernet data by CLT.
CNU is end user's terminal, up going port is a coaxial cable, down going port comprises FE (Fast Ethernet, quick 10/100M) mouth and coaxial cable mouth, 10/100M Ethernet interface (FE mouth) links to each other with TV with set-top box, coaxial cable mouth fast, the inside integrated PHY layer chip and MAC layer chip, wherein PHY layer chip is used for the reception of data, and MAC layer chip is used for the processing of data.
For fear of data collision, realize the synchronous of signal, to realize automatic range between CLT and the CNU, and carry out the upstream bandwidth distribution according to each user's SLA (Service Level Agreement, service level agreement).Wherein downlink data (CLT mails to the packet of CNU) is transferred to each CNU with broadcast mode, the packet of CNU reception self LLID (Logical Link Identifier, LLID) or broadcasting LLID.And at up direction, the data that CNU sends only can send to CLT, and can not arrive CNU.For fear of conflict and network efficiency, the transmitting time of CNU needs arbitration, promptly adopts time-division multiplex technology, distributes to send window of each CNU, and after CNU arrived send window, CNU began to send data.
In the EOC system, owing to impedance does not match or reason such as network layout, can cause equipment send signal on coaxial line by echo reflection, the equipment CLT/CNU of causing receives the own message that sends, or wrong the bag.Cause the possible cause of echo reflection as follows: (1) link impedance is discontinuous, and this may be because reasons such as PCB (Print Circuit Board, printed substrate) wiring or device deviation cause; (2) on the unsettled port of branch distributor, do not use standard 75ohm terminate load on the link as requested; (3) user causes terminate load not match CNU device powers down or disconnection physical connection.
Proposed a kind of utilization in the prior art and added the method that the standard load solves echo problems, it has realized the impedance matching on the link by hardware.The shortcoming of this method is: in actual cloth network process, realize that by hardware the impedance matching difficulty is bigger, can't force to dose standard termination under the situation of user's outage; Also can't use standard termination at branch, distributor in addition.
Summary of the invention
The invention provides the echo wave filtering method and apparatus in a kind of EOC system, to realize filtration to the echo data in the EOC system.
For achieving the above object, the invention provides the echo wave filtering method in a kind of EOC system, may further comprise the steps:
Obtain purpose LLID and source LLID in the message that receives;
According to described source LLID and purpose LLID described message is judged, when described purpose LLID corresponding equipment comprises this equipment and non-equipment of described source LLID corresponding equipment, handled described message, otherwise abandon.
Wherein, also comprise step before the described source LLID that obtains in the message that receives:
Need be in the message that target device sends, the LLID that adds this equipment be as source LLID, and the LLID of target device is as purpose LLID;
Described message is sent to target device.
Wherein, the described step of message being judged according to source LLID and purpose LLID is specially:
Judge whether described purpose LLID corresponding equipment comprises this equipment, is then to continue, otherwise abandon described message;
Judge whether described source LLID corresponding equipment is this equipment, be to judge that then described message is the echo message and abandons, otherwise handle described message.
Wherein, the described step of message being judged according to source LLID and purpose LLID is specially:
Judging whether described source LLID corresponding equipment is this equipment, is to judge that then described message is the echo message and abandons, otherwise continues;
Judge that whether described purpose LLID corresponding equipment comprises this equipment, is then to handle described message, otherwise abandons.
The method of carrying source LLID and/or purpose LLID in described message is specially:
In message, add new LLID field, when message sends, the information that described new LLID field and original LLID field write down source LLID and purpose LLID respectively.
After the LLID field of described new interpolation is positioned at original LLID field.
The present invention also provides a kind of network equipment, is used for the echo wave filtering of EOC system, comprising:
The LLID acquiring unit is used for from the message that receives, and obtains the source LLID and the purpose LLID that carry in the message;
Judging unit, the source LLID and the purpose LLID that are used for the message that gets access to according to described LLID acquiring unit judge described message, when the purpose LLID of described message corresponding equipment comprises this equipment and non-equipment of described source LLID corresponding equipment, described message is sent to processing unit, otherwise abandon described message;
Processing unit is used to handle the message that described judging unit sends.
Also comprise:
The LLID adding device, when being used for after described processing unit is handled the message that receives, needing returned packet, or this equipment needs initiatively when target device sends message, the LLID that adds this equipment in the message that needs send is as source LLID, and the LLID of described target device is as purpose LLID;
Transmitting element is used for the message that has source LLID and purpose LLID that described LLID adding device generates is sent to described target device.
The described network equipment is coaxial cable carrier ethernet terminal CNU or coaxial cable carrier Ethernet head end CLT.
Compared with prior art, the present invention has the following advantages:
By in message, adding source LLID and purpose LLID, realized that the network equipment in the coaxial Ethernet system for the automatic fitration of echo data, need not the hardware in the network is changed.
Description of drawings
Fig. 1 is the connected mode schematic diagram of EOC system in the prior art;
Fig. 2 is a mutual message format schematic diagram between CLT and the CNU in the prior art;
Fig. 3 is a message format schematic diagram mutual between CLT of the present invention and the CNU;
Fig. 4 is the flow chart of echo wave filtering method of the present invention;
Fig. 5 is another flow chart of echo wave filtering method of the present invention;
Fig. 6 is the structural representation that is used for the network equipment of echo wave filtering of the present invention.
Embodiment
Core concept of the present invention is: increase by a new LLID field in the message that transmits between CLT and CNU, be used in combination with original LLID field, the transmission source device and the destination device of this message identified simultaneously.By these two LLID, the equipment that receives message can be judged the transmission source device of message, when the transmission source device of finding this message is exactly this equipment, can think that this message is owing to echo produces, therefore directly abandon, thereby realized automatic fitration the echo message.
When coaxial Ethernet switch system works in half-or full-duplex mode following time, according to the IEEE802.3ah standard, the data message form is illustrated in fig. 2 shown below between CLT and the CNU, comprises following field: 0xD5, and this field represents to include in this newspaper literary composition LLID information; LLID, LLID gives each CNU by the CLT dynamic assignment, is used for different CNU is carried out unique identification; CRC (Cyclic RedundancyCheck, cyclic redundancy check (CRC)) is used for the reliability of data message is carried out verification; DA (DestinationAddress, destination address) is used for the MAC Address of storage purpose equipment; SA (Source Address, source address), the MAC Address that is used to store source device; Length/Type (length/type) is used for the length and the type of message are identified; Op-Code (command code) is used for the coded system of identification data message; TimeStamp (timestamp) is used to represent the transmitting time of data message; Payload (payload) is used to carry data; FCS (Frame Check Sequence, Frame Check Sequence) is used to check issuable mistake when frame passes through link transmission.
In a single day each CNU succeeds in registration at CLT, CLT can distribute a unique LLID that can discern this CNU to CNU.When CLT when some CNU sends downlink data, the LLID of this CNU can be filled in the message as the purpose LLID of message, when CNU receives the LLID of own sign or broadcasts the message of LLID, receive this message and handle, otherwise abandon this message.When the CNU upstream data, also the LLID of this CNU can be filled in the message as the source LLID of message, after CLT receives message, send to up direction again.
The echo data decision problem that exists when using the method for having now is as follows: when CLT sends downlink data to CNU, CLT adds the LLID of CNU in the message and to CNU to and sends, when having echo data to produce in the network, if CLT receives this data, then can not judge that according to LLID these data are echo datas that data itself that send produce, still therefore the up data of CNU can't filter echo data.Equally, when CNU when CLT sends upstream data, if there is echo data to produce, then CNU can't judge that the data that receive are the echo datas that upstream data that CNU itself sends produces according to LLID, still therefore the descending data of CLT also can't filter echo data.
Among the present invention, can realize filtration by adding a new LLID in the message between CLT and CNU to echo data.
As shown in Figure 3, in message, increase a new LLID and (use LLID here
*Expression is to embody the difference with original LLID) field, the point of addition of this field can be positioned at before the back, crc field of former LLID field, and the position and the content of other fields remain unchanged.Add this LLID
*After the field, comprise two LLID fields in the message, therefore can be with first LLID field identification purpose LLID (Destination LLID), with second LLID field identification source LLID (Source LLID).
When CLT when CNU sends message, the LLID of CNU is added in first LLID field of message as the purpose LLID of message, the LLID with self adds in second LLID field as the source LLID of message simultaneously.When CLT receives message, if the source LLID of this message is the ID of this equipment, can judge that then this message is the message that oneself sends, be because echo produces, therefore abandon this message.Equally, when CNU when CLT sends message, self LLID is added in second LLID field of message as the source LLID of message, simultaneously the LLID of CLT is added in first LLID field of message as the purpose LLID of message.When CNU receives message, if this source LLID is the ID of this equipment, can judge that then this message is the message that oneself sends, be because echo produces, therefore abandon this message.So just can realize the filtration of echo data.
When using this method, a kind of echo wave filtering method of the present invention comprises the steps: as shown in Figure 4
When step s401, network side source device send message at needs, the LLID that in message, adds this equipment as the LLID of source LLID, target device as purpose LLID.
This purpose LLID may be the LLID of some target devices or the LLID of broadcasting interval scale all devices.
Step s402, network side source device send this message to target device.
Step s403, network side source device receive message, obtain the purpose LLID in the message.
Whether the purpose LLID corresponding equipment of step s404, this message of network side source device judges comprises this equipment, is then to carry out step s405, otherwise abandons this message.
By this step, can not that the message of this equipment filters with destination device.But wherein may comprise the echo message that produces when message that this equipment broadcasts is by echo reflection in network.
Step s405, network side source device obtain the source LLID in the message.
Whether the source LLID corresponding equipment of step s406, this message of network side source device judges is this equipment, is not then to carry out step s407, is then to abandon this message.
By this step, the echo that the message that this equipment can be sent produces filters, thereby only keeps the message that other equipment send to this equipment.
Step s407, this message that receives of network side source device processes.
Handling in this step in the message obtain needs when target device sends, still according to the method for describing among the step s401, in message the LLID of this equipment of interpolation as the LLID of source LLID, target device as purpose LLID.
By above-mentioned steps s401～s405,, realized that the network equipment according to the automatic fitration of the source LLID in the message to echo, need not the hardware in the network is changed by in message, adding source LLID and purpose LLID.The network equipment here is CNU or CLT.
On the order that purpose LLID and source LLID are verified, except that the method for the above-mentioned purpose of checking earlier LLID, can also take the method for first checking source LLID, this moment echo wave filtering method of the present invention as shown in Figure 5, comprise the steps:
When step s501, network side source device send message at needs, the LLID that in message, adds this equipment as the LLID of source LLID, target device as purpose LLID.
This purpose LLID may be the LLID of some target devices or the LLID of broadcasting interval scale all devices.
Step s502, network side source device send this message to target device.
Step s503, network side source device receive message, obtain the source LLID in the message.
Whether the source LLID corresponding equipment of step s504, this message of network side source device judges is this equipment, is then to abandon this message, otherwise carries out step s505.
By this step, the echo that the message that this equipment can be sent produces filters.This echo may comprise: the echo message that the message that the echo message that the message that this equipment sends to other equipment produces during by echo reflection or this equipment are broadcasted in network produces during by echo reflection.
Step s505, network side source device obtain the purpose LLID in the message.
Whether the purpose LLID corresponding equipment of step s506, this message of network side source device judges comprises this equipment, is then to carry out step s507, otherwise abandons this message.
By this step, only kept the message that other equipment send to this equipment.
Step s507, this message that receives of network side source device processes.
Handling in this step in the message obtain needs when target device sends, still according to the method for describing among the step s501, in message the LLID of this equipment of interpolation as the LLID of source LLID, target device as purpose LLID.
The present invention also provides a kind of network equipment, is used for the echo wave filtering of EOC system, and this equipment is CLT or the CNU in the EOC system.Its structure comprises as shown in Figure 6: receiving element 10, LLID acquiring unit 20, judging unit 30 and processing unit 40.Wherein:
Receiving element 10 is used to receive the message that the opposite end network equipment sends.
Judging unit 30, the source LLID and the purpose LLID that are used for the message that gets access to according to LLID acquiring unit 20 judge message, when the purpose LLID of message corresponding equipment comprises non-equipment of source LLID corresponding equipment of this equipment and message, this message is sent to processing unit 40, otherwise abandon this message.
Processing unit 40 is used to handle the message that judging unit 30 sends.
In addition, this network equipment also comprises LLID adding device 50 and transmitting element 60.
Transmitting element 60 is used for the message that has source LLID and purpose LLID information that LLID adding device 50 generates is sent to opposite equip..
By the above-mentioned network equipment, by in message, adding source LLID and purpose LLID, realized the automatic fitration of the network equipment to echo, need not the hardware in the network is changed.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware, but the former is better execution mode under a lot of situation.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium, comprises that some instructions are with so that the equipment in EOC system is carried out the described method of each embodiment of the present invention.
More than disclosed only be several specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.
Claims (9)
1. the echo wave filtering method in the EOC system is characterized in that, may further comprise the steps:
Obtain purpose LLID and source LLID in the message that receives;
According to described source LLID and purpose LLID described message is judged, when described purpose LLID corresponding equipment comprises this equipment and non-equipment of described source LLID corresponding equipment, handled described message, otherwise abandon.
2. the echo wave filtering method in the EOC system according to claim 1 is characterized in that, also comprises step before the described source LLID that obtains in the message that receives:
Need be in the message that target device sends, the LLID that adds this equipment be as source LLID, and the LLID of target device is as purpose LLID;
Described message is sent to target device.
3. the echo wave filtering method in the EOC system according to claim 1 is characterized in that, the described step of message being judged according to source LLID and purpose LLID is specially:
Judge whether described purpose LLID corresponding equipment comprises this equipment, is then to continue, otherwise abandon described message;
Judge whether described source LLID corresponding equipment is this equipment, be to judge that then described message is the echo message and abandons, otherwise handle described message.
4. the echo wave filtering method in the EOC system according to claim 1 is characterized in that, the described step of message being judged according to source LLID and purpose LLID is specially:
Judging whether described source LLID corresponding equipment is this equipment, is to judge that then described message is the echo message and abandons, otherwise continues;
Judge that whether described purpose LLID corresponding equipment comprises this equipment, is then to handle described message, otherwise abandons.
5. as the echo wave filtering method in the EOC system as described in each in the claim 1 to 4, it is characterized in that the method for carrying source LLID and/or purpose LLID in described message is specially:
In message, add new LLID field, when message sends, the information that described new LLID field and original LLID field write down source LLID and purpose LLID respectively.
6. as the echo wave filtering method in the EOC system as described in the claim 5, it is characterized in that,
After the LLID field of described new interpolation is positioned at original LLID field.
7. network equipment is used for the echo wave filtering of EOC system, it is characterized in that, comprising:
The LLID acquiring unit is used for from the message that receives, and obtains the source LLID and the purpose LLID that carry in the message;
Judging unit, the source LLID and the purpose LLID that are used for the message that gets access to according to described LLID acquiring unit judge described message, when the purpose LLID of described message corresponding equipment comprises this equipment and non-equipment of described source LLID corresponding equipment, described message is sent to processing unit, otherwise abandon described message;
Processing unit is used to handle the message that described judging unit sends.
8. as the network equipment as described in the claim 7, it is characterized in that, also comprise:
The LLID adding device, when being used for after described processing unit is handled the message that receives, needing returned packet, or this equipment needs initiatively when target device sends message, the LLID that adds this equipment in the message that needs send is as source LLID, and the LLID of described target device is as purpose LLID;
Transmitting element is used for the message that has source LLID and purpose LLID that described LLID adding device generates is sent to described target device.
9. as the network equipment as described in claim 7 or 8, it is characterized in that the described network equipment is coaxial cable carrier ethernet terminal CNU or coaxial cable carrier Ethernet head end CLT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710145933XA CN101110611B (en) | 2007-08-31 | 2007-08-31 | Method and apparatus for echo wave filtering in EOC system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710145933XA CN101110611B (en) | 2007-08-31 | 2007-08-31 | Method and apparatus for echo wave filtering in EOC system |
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| CN101110611A true CN101110611A (en) | 2008-01-23 |
| CN101110611B CN101110611B (en) | 2010-12-08 |
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| CN200710145933XA Expired - Fee Related CN101110611B (en) | 2007-08-31 | 2007-08-31 | Method and apparatus for echo wave filtering in EOC system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101841497B (en) * | 2009-03-20 | 2013-04-10 | 高通创锐讯企业管理(上海)有限公司 | Up/down frequency conversion method in EOC (Ethernet Over Coax) network |
| CN103152203A (en) * | 2013-03-18 | 2013-06-12 | 成都市广达电子电讯技术开发有限公司 | Method for learning EOC (Ethernet over Coax) local side MAC (Medium/Media Access Control) address restriction |
| CN108092912A (en) * | 2017-11-30 | 2018-05-29 | 武汉丰天鼎业信息网络有限公司 | Inhibit the method for EOC data interference |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1291341C (en) * | 2003-01-30 | 2006-12-20 | 烽火通信科技股份有限公司 | Method and apparatus for realizing Ethernet passive optical network system dynamic filtration data base |
| KR100617734B1 (en) * | 2003-03-19 | 2006-08-28 | 삼성전자주식회사 | Implementing Method of Logical MAC in EPON and Computer Readable Recoding Medium for Performing it |
-
2007
- 2007-08-31 CN CN200710145933XA patent/CN101110611B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101841497B (en) * | 2009-03-20 | 2013-04-10 | 高通创锐讯企业管理(上海)有限公司 | Up/down frequency conversion method in EOC (Ethernet Over Coax) network |
| CN103152203A (en) * | 2013-03-18 | 2013-06-12 | 成都市广达电子电讯技术开发有限公司 | Method for learning EOC (Ethernet over Coax) local side MAC (Medium/Media Access Control) address restriction |
| CN103152203B (en) * | 2013-03-18 | 2015-10-14 | 成都广达电子股份有限公司 | A kind of method of EOC local side MAC Address restriction study |
| CN108092912A (en) * | 2017-11-30 | 2018-05-29 | 武汉丰天鼎业信息网络有限公司 | Inhibit the method for EOC data interference |
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| CN101110611B (en) | 2010-12-08 |
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Address after: 310052 Binjiang District Changhe Road, Zhejiang, China, No. 466, No. Patentee after: Xinhua three Technology Co., Ltd. Address before: 310053 Hangzhou hi tech Industrial Development Zone, Zhejiang province science and Technology Industrial Park, No. 310 and No. six road, HUAWEI, Hangzhou production base Patentee before: Huasan Communication Technology Co., Ltd. |
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