CN101465841A - EOC network data transmission system - Google Patents
EOC network data transmission system Download PDFInfo
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- CN101465841A CN101465841A CNA2007100946009A CN200710094600A CN101465841A CN 101465841 A CN101465841 A CN 101465841A CN A2007100946009 A CNA2007100946009 A CN A2007100946009A CN 200710094600 A CN200710094600 A CN 200710094600A CN 101465841 A CN101465841 A CN 101465841A
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Abstract
The invention discloses an EOC network data transmission system, comprising a master device and a slave device, between which a splitter or a distributor is arranged. The direction, in which the master device transfers data packets to the slave device through the splitter or the distributor or both is the down direction of the data transmission; and the direction, in which the slave device transfers data packets to the master device through the splitter, or the distributor or both is the up direction of the data transmission. A down identifier is contained in the lead code of an Ethernet frame in the down direction in which the master device sends data, and an up identifier is contained in the lead code of an Ethernet frame in the up direction in which the slave device sends data. When receiving the Ethernet frames, the slave device judges the Ethernet frame in the up direction and the Ethernet frame in the down direction according to the identifiers contained in the lead codes of the Ethernet frames. By adding the up identifier and the down identifier to the lead codes for data transmission in an EOC network, the EOC network data transmission system enables the up data sent from the slave device and the down data sent from the master device to be distinguished.
Description
Technical field
The present invention relates to network data transmission technology, particularly a kind of EOC network data transmission system.
Background technology
The network of EOC (Ethernet over Cable is based on coaxial cable transmission ethernet frame) is the framework of point-to-multipoint.Comprise a main equipment, a plurality of slave units also have one or more splitters or distributor between main equipment and the slave unit, perhaps comprise splitter and distributor between main equipment and slave unit simultaneously.By splitter or distributor, main equipment is connected with a plurality of slave units with tree.In existing EOC network data transmission system, the transmission direction of data has two, is respectively up direction and down direction.Main equipment is a down direction to the direction that slave unit sends packet transmission data, and slave unit is a up direction to the direction that main equipment sends packet transmission data.
As shown in Figure 1, comprise a main equipment and five slave units in the EOC network data transmission system, slave unit A, slave unit B, slave unit C, slave unit D, slave unit E, main equipment is connected with splitter by data wire, splitter and distributor 1 and distributor 2 and slave unit C are connected with data wire, distributor 1 and slave unit A, slave unit B, distributor 2 is connected with slave unit D, slave unit E.Upstream data arrives distributor 1 from main equipment through splitter and arrives slave unit A and slave unit B more respectively, perhaps directly be transferred to slave unit C through splitter, perhaps arrive distributor 2 through splitter and arrive slave unit D and slave unit E more respectively from main equipment from main equipment.
But owing to not to isolate fully between two lower joint mouths of distributor.Since big inadequately to the decay of signal, can cause the upstream data of the next slave unit of same distributor can arrive another slave unit of this distributor, and work as enough sensitivities of this slave unit receiving terminal, can correctly receive these upstream datas.As shown in Figure 2, because slave unit can't judge that when accepting packet this packet is upstream data bag or downlink data packet, when slave unit A and slave unit B are positioned at same distributor 1, when slave unit A sent data to main equipment, slave unit B can receive the upstream data of device A.Like this, just can directly transmit data between the ustomer premises access equipment and communicate, but generally do not wish between the ustomer premises access equipment can direct communication for Virtual network operator, does not wish that promptly any one slave unit receives the data from other slave units.
Summary of the invention
Technical problem to be solved by this invention provides a kind of EOC network data transmission system, and slave unit can the judgment data bag be upstream data bag or downlink data packet.
For solving the problems of the technologies described above, the technical scheme of EOC network data transmission system of the present invention is, comprise main equipment and slave unit, be provided with one or more splitters or distributor between main equipment and the slave unit, main equipment is connected with a plurality of slave units with tree, main equipment process splitter or distributor or splitter and distributor are the down direction of transfer of data to the direction of slave unit transmits data packets, slave unit process splitter or distributor or splitter and distributor are the up direction of transfer of data to the direction of master transmissions packet, carry down row identifier in the lead code of the downlink Ethernet frame that main equipment sends, carry row identifier in the lead code of the up ethernet frame that slave unit sends, the identifier that slave unit carries in the lead code according to this ethernet frame when accepting ethernet frame judges that this ethernet frame is up ethernet frame or downlink Ethernet frame.
Be that the preamble length of ethernet frame is eight bytes as a further improvement on the present invention.
Be that the 5th byte of ethernet frame lead code is last row identifier or following row identifier as another kind of further improvement of the present invention.
The present invention is by carrying up in the lead code of the ethernet frame that transmits data or following row identifier, make slave unit can judge that when accepting data these data are the downlink datas that come by master transmissions, still the upstream data that comes by other slave unit transmission.
Description of drawings
The present invention is further detailed explanation below in conjunction with drawings and Examples:
Fig. 1 is a prior art EOC network topological diagram;
Fig. 2 is an EOC network data transmission schematic diagram in the prior art;
Fig. 3 is the EOC network topological diagram of EOC network data transmission system of the present invention;
Fig. 4 is the lead code form schematic diagram of downlink data ethernet frame in the EOC network of the present invention;
Fig. 5 is the lead code form schematic diagram of upstream data ethernet frame in the EOC network of the present invention.
Embodiment
EOC (EOC, Ethernet over Cable) network is based on the network of coaxial cable transmission ethernet frame, belongs to a kind of packet network based on coaxial cable.As shown in Figure 3, comprise a main equipment in the EOC network data transmission system, this main equipment transmits to being connected the line data of going forward side by side with splitter by data wire, splitter is connected respectively with distributor 1, slave unit C and distributor 2, distributor 1 is connected respectively with slave unit A and slave unit B, and distributor 2 is connected respectively with slave unit D, slave unit E and slave unit F.Between main equipment and the slave unit a plurality of splitters and distributor can be set, each splitter can be connected with a plurality of distributors and a plurality of slave unit, and each distributor also can be connected with a plurality of slave units.
Main equipment is the down direction of transfer of data through splitter and distributor 1 and distributor 2 to the direction of slave unit A, slave unit B, slave unit C, slave unit D, slave unit E and slave unit F transmits data packets, and slave unit A, slave unit B, slave unit C, slave unit D, slave unit E and slave unit F are the up direction of transfer of data by distributor 1 and distributor 2 and splitter to the direction of master transmissions packet.
The EOC network needed first transmission preamble sign indicating number before each Frame of transmission, Frame and lead code all belong to ethernet frame.
As shown in Figure 4, carry down row identifier in the lead code of the down direction ethernet frame that equipment sends, this ethernet frame preamble length is 8 bytes.Value is defined as follows:
First byte: value is 0x55, and 0x wherein represents hexadecimal number;
Second byte: value is 0x55, and 0x wherein represents hexadecimal number;
The 3rd byte: SLD (Start LLID Delimiter, LLID starting delimiter), value is 0xD5;
The 4th byte: reserve (Reserved), default value is 0x55;
The 5th byte: the downlink data identifier, with 0x55 sign downlink Ethernet frame;
The 6th byte and the 7th byte representation LLID territory (Logical Link Identifier, logical link identifier) are used to identify the slave unit of accepting of Frame after this lead code.Wherein, the 6th byte is LLID[15:8], i.e. the high eight-bit in LLID territory.The 7th byte is LLID[7:0].Be the low eight of LLID territory.The value in LLID territory is when 0x0000 is in the scope of 0xFFFE, and each value identifies single slave unit; The value in LLID territory is a broadcast identifier during for 0xFFFF, identifies all slave units.
The 8th byte: CRC8 (Cyclic Redundancy Check, cyclic redundancy check (CRC) symbol).To the cyclic redundancy check (CRC) of SLD to five bytes in LLID territory, account form is as described in the IEEE 802.3-2005Clause65.1.3.2.3 standard.
As shown in Figure 5, carry row identifier in the lead code of the up direction ethernet frame that main equipment sends, this ethernet frame preamble length is 8 bytes.Value is defined as follows:
First byte, value are 0x55, and 0x wherein represents hexadecimal number;
Second byte, value are 0x55, and 0x wherein represents hexadecimal number;
The 3rd byte: SLD (Start LLID Delimiter, LLID starting delimiter), value is 0xD5;
The 4th byte: reserve (Reserved), default value is 0x55;
The 5th byte is the upstream data identifier, identifies up ethernet frame with 0xD5;
The 6th byte and the 7th byte representation LLID territory (Logical Link Identifier, logical link identifier) are used to identify the slave unit of accepting of Frame after this lead code.Wherein, the 6th byte is LLID[15:8], i.e. the high eight-bit in LLID territory.The 7th byte is LLID[7:0].Be the low eight of LLID territory.The value in LLID territory is when 0x0000 is in the scope of 0xFFFE, and each value identifies single slave unit; The value in LLID territory is a broadcast identifier during for 0xFFFF, identifies all slave units.
The 8th byte is CRC8 (Cyclic Redundancy Check, cyclic redundancy check (CRC) symbol).To the cyclic redundancy check (CRC) of SLD to five bytes in LLID territory, account form is as described in the IEEE 802.3-2005Clause65.1.3.2.3 standard.
Be main equipment when sending any one downlink Ethernet frame, it be 0x55 that the 5th byte of its lead code needs value.When any slave unit sent any up ethernet frame, it be 0xD5 that the 5th byte of its lead code needs value.And the identifier that slave unit carries in the lead code according to this ethernet frame when accepting ethernet frame judges that this ethernet frame still is the down direction ethernet frame for the up direction ethernet frame.
The present invention is by to adding the up-downgoing identifier in the lead code of the data transmitted in the EOC network, the content that does not need to change ethernet frame just makes the downlink data that sends on the upstream data that sends on the slave unit and the main equipment to differentiate.
Claims (12)
1. EOC network data transmission system, comprise main equipment and slave unit, be provided with one or more splitters or distributor between main equipment and the slave unit, main equipment is connected with a plurality of slave units with tree, main equipment process splitter or distributor or splitter and distributor are the down direction of transfer of data to the direction of slave unit transmits data packets, slave unit process splitter or distributor or splitter and distributor are the up direction of transfer of data to the direction of master transmissions packet, it is characterized in that, carry down row identifier in the lead code of the down direction ethernet frame that main equipment sends, carry row identifier in the lead code of the up direction ethernet frame that slave unit sends, the identifier that slave unit carries in the lead code according to this ethernet frame when accepting ethernet frame judges that this ethernet frame still is the down direction ethernet frame for the up direction ethernet frame.
2. EOC network data transmission system according to claim 1 is characterized in that, the preamble length of ethernet frame is eight bytes.
3. EOC network data transmission system according to claim 2 is characterized in that, the 5th byte of ethernet frame lead code is last row identifier or following row identifier.
4. according to claim 2 or 3 described EOC network data transmission systems, it is characterized in that the last row identifier in the ethernet frame lead code is 0xD5.
5. according to claim 2 or 3 described EOC network data transmission systems, it is characterized in that the following row identifier in the ethernet frame lead code is 0x55.
6. EOC network data transmission system according to claim 2 is characterized in that, first byte of ethernet frame lead code and second byte value are 0x55, and 0x wherein represents hexadecimal number.
7. EOC network data transmission system according to claim 2 is characterized in that, the 3rd byte of ethernet frame lead code is the LLID starting delimiter, and value is 0xD5.
8. EOC network data transmission system according to claim 2 is characterized in that, the 4th byte of ethernet frame lead code is for reserving, and default value is 0x55.
9. EOC network data transmission system according to claim 2 is characterized in that, the 6th byte and the 7th byte representation LLID territory of ethernet frame lead code are used to identify the slave unit of accepting of Frame after this lead code.
10. EOC network data transmission system according to claim 9 is characterized in that, the high eight-bit in LLID territory is the 6th byte of ethernet frame lead code, and low eight of the LLID territory is the 7th byte of ethernet frame lead code.
11. EOC network data transmission system according to claim 9 is characterized in that, the value in LLID territory is when 0x0000 is in the scope of 0xFFFE, and each value identifies single slave unit; The value in LLID territory is a broadcast identifier during for 0xFFFF, identifies all slave units.
12. EOC network data transmission system according to claim 2 is characterized in that, the 8th byte of ethernet frame lead code is the cyclic redundancy check (CRC) symbol, and the 3rd to the 7th byte of described lead code is carried out cyclic redundancy check (CRC).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100946009A CN101465841A (en) | 2007-12-21 | 2007-12-21 | EOC network data transmission system |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007100946009A CN101465841A (en) | 2007-12-21 | 2007-12-21 | EOC network data transmission system |
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| CN101465841A true CN101465841A (en) | 2009-06-24 |
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| CNA2007100946009A Pending CN101465841A (en) | 2007-12-21 | 2007-12-21 | EOC network data transmission system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101841512A (en) * | 2009-03-20 | 2010-09-22 | 天际微芯(北京)科技有限公司 | Uplink and downlink communication method of identifier in EOC network |
| CN109891777A (en) * | 2016-09-26 | 2019-06-14 | 赛峰电子与防务公司 | Method for distinguishing uplink and downlink communication |
-
2007
- 2007-12-21 CN CNA2007100946009A patent/CN101465841A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101841512A (en) * | 2009-03-20 | 2010-09-22 | 天际微芯(北京)科技有限公司 | Uplink and downlink communication method of identifier in EOC network |
| CN109891777A (en) * | 2016-09-26 | 2019-06-14 | 赛峰电子与防务公司 | Method for distinguishing uplink and downlink communication |
| CN109891777B (en) * | 2016-09-26 | 2022-05-24 | 赛峰电子与防务公司 | Storage medium, unmanned mobile device system, and method implemented therein |
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Open date: 20090624 |