CN101877691B - Encapsulation and decapsulation method of physical layer frame in EOC (Ethernet over Coax) network - Google Patents
Encapsulation and decapsulation method of physical layer frame in EOC (Ethernet over Coax) network Download PDFInfo
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- CN101877691B CN101877691B CN 200910057149 CN200910057149A CN101877691B CN 101877691 B CN101877691 B CN 101877691B CN 200910057149 CN200910057149 CN 200910057149 CN 200910057149 A CN200910057149 A CN 200910057149A CN 101877691 B CN101877691 B CN 101877691B
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Abstract
The invention discloses an encapsulation method of a physical layer frame in an EOC (Ethernet over Coax) network, which comprises the following steps of: (1) structuring an IDLE frame by a data link layer, wherein the IDLE frame is an Ethernet frame; and (2) encapsulating all the Ethernet frames in a time interval into a physical layer frame by a physical layer, and forwarding all the Ethernet frames in a time interval to the physical layer by the data link layer; when the data link layer has a data ethernet frame to be forwarded, forwarding the data Ethernet frame to the physical layer; and when the data link layer has no data Ethernet frame to be forwarded, forwarding the IDLE frame to the physical layer. The invention also discloses a corresponding decapsulation method of the physical layer frame, which comprises the following steps of: (1) partially extracting the data of each physical layer frame by the physical layer, restoring one or more Ethernet frames; and (2) judging and distinguishing the IDLE frame and the data Ethernet frame by the physical layer. The invention can improve the bandwidth efficiency of the physical layer and solve the problem of the interruption of the data Ethernet frame.
Description
Technical field
The present invention relates to encapsulation and the de-encapsulation method of data structure in a kind of EOC network.
Background technology
CHINA RFTCOM Co Ltd is used for the cable TV signal of transfer of unidirectional originally.In order to take full advantage of the CHINA RFTCOM Co Ltd resource, Broadcast and TV system carries out bidirectional rebuilding to unidirectional cable TV network gradually, makes the cable TV signal that it can transfer of unidirectional, can transmit two-way data-signal again.
Current, the backbone network of Broadcast and TV system has been realized fiberize, only in the nearest kilometer range of user or wired coaxial cable.Cost is still too high in the situation that Fiber to the home, in order to save cost, and need to be at existing wired transmission over coaxial cable network signal.
EOC (Ethernet over COAX, Ethernet transmits based on coaxial cable) network is a kind of method at wired transmission over coaxial cable ethernet frame.Ethernet frame is mainly used in transmitting on twisted-pair feeder, and is not suitable for direct wired transmission over coaxial cable at the EOC network.
See also Fig. 1, the method of the physical layer process ethernet frame of EOC network is at present: the physical layer of the sending side terminal equipment of EOC network (comprising local side apparatus and ustomer premises access equipment) is a physical layer frame (or being called physical layer transmission stream) with each ethernet frame Reseal, each ethernet frame is as the data division of each physical layer frame, added in addition the frame head of physical layer frame before this data division, and/or add the postamble of physical layer frame after this data division.The de-encapsulation method of above-mentioned physical layer frame is that the physical layer of the receiving side terminal equipment of EOC network extracts the data division of each physical layer frame, as an ethernet frame, is transmitted to data link layer.
There is a drawback in said method, and owing to being a physical layer frame with each ethernet frame Reseal, and the physical layer channel information that the frame head of each physical layer frame and/or postamble comprise is repetition, and this has just caused the waste of transmitting data in physical layer.
Summary of the invention
Technical problem to be solved by this invention is to provide encapsulation and the de-encapsulation method of physical layer frame in a kind of EOC network, and the method has higher physical layer bandwidth usage efficient.
For solving the problems of the technologies described above, in EOC network of the present invention, the method for packing of physical layer frame comprises the steps:
The 1st step, the data link layer structure IDLE frame of the sending side terminal equipment of EOC network, described IDLE frame is ethernet frame;
The 2nd step, the physical layer of the sending side terminal equipment of EOC network is encapsulated as a physical layer frame with all ethernet frames in the period, with the data division of all ethernet frames in the described period as physical layer frame, added the frame head of physical layer frame before this data division, and/or add the postamble of physical layer frame after this data division;
The data link layer of the sending side terminal equipment of EOC network all is transmitted to physical layer with all ethernet frames in the period; When data link layer has data Ethernet frame to forward, to physical layer forwarding data ethernet frame; When data link layer forwards without data Ethernet frame, forward described IDLE frame to physical layer.
In EOC network of the present invention, the de-encapsulation method of physical layer frame is, the physical layer of the receiving side terminal equipment of EOC network extracts the data division of each physical layer frame, whether judgement wherein comprises the IDLE frame, is one or more ethernet frames with the partial reduction of getting rid of the IDLE frame in described data division.
The encapsulation of the physical layer frame that the present invention provides and de-encapsulation method make all ethernet frames in the period all be encapsulated as a physical layer frame, and these ethernet frames are shared the physical layer channel information of physical layer frame frame head and/or postamble; And the ethernet frame for data link layer interrupts having provided solution.When physical layer frame frame head/when the postamble expense was larger, the present invention was maintained the physical channel efficiency of bandwidth use with very low cost, and realize very simply, do not affect physical layer and high-rise the realization simultaneously.
Description of drawings
Fig. 1 is the schematic diagram of the method for packing of physical layer frame in existing EOC network;
Fig. 2 is a kind of improved schematic diagram of method for packing to physical layer frame in existing EOC network;
Fig. 3 is to the another kind of improved schematic diagram of the method for packing of physical layer frame in existing EOC network;
Fig. 4 is another the improved schematic diagram of method for packing to physical layer frame in existing EOC network;
Fig. 5 is the schematic diagram of the method for packing of physical layer frame in EOC network of the present invention;
Fig. 6 is the schematic diagram of the de-encapsulation method of physical layer frame in EOC network of the present invention.
Embodiment
To the improvement that the method for the physical layer of terminal equipment in existing EOC network encapsulation physical layer frame is done, can be by physical layer, all ethernet frames in the period all to be encapsulated as a physical layer frame.See also Fig. 2, specific practice be with all ethernet frames in the period as the data division of physical layer frame, added the frame head of physical layer frame before this data division, and/or add the postamble of physical layer frame after this data division.Described frame head and/or postamble comprise physical layer channel information, so just can make all ethernet frames in the period share these physical layer channel information.The de-encapsulation method of the physical layer frame that it is corresponding is that the physical layer of the receiving side terminal equipment of EOC network is extracted the data division of described physical layer frame, recovers one or more ethernet frames.
Described " period " refers to a descending period or a up period to half-duplex EOC network, and full duplex EOC network is referred to a downstream cycle or a upper line period.
Shown in Figure 2 improve one's methods also that existing problems need to solve.In the EOC network, the physical layer of terminal equipment is in being encapsulated as the process of physical layer frame with ethernet frame, and data link layer must forward (or claiming to dispatch, provide) ethernet frame to physical layer continuously.But network traffics have burst characteristic, might within a period, the situation that the one or many ethernet frame interrupts can occur.Described ethernet frame interrupts referring to data link layer after physical layer forwards an ethernet frame end, through IFG (InterFrame Gap, the frame period) time, does not forward next ethernet frame and namely is considered as interrupting.For this situation, two kinds of solution routes are arranged at present:
One sees also Fig. 3, and when data link layer generation ethernet frame interrupted, physical layer finished the current physical layer frame; When data link layer forwarded ethernet frame again, physical layer began a new physical layer frame.This method makes all ethernet frames in the period may be encapsulated as one or more physical layer frames, and these physical layer frames have frame head and/or the postamble of repetition, has equally the problem of physical layer transmission waste.
Its two, see also Fig. 4, when data link layer generation ethernet frame interrupted, physical layer was automatically filled binary data stream in physical layer frame.This method requires physical layer must have interface to control data flow that when data flow begin to fill, when stop filling, fill to have which feature, (physical layer of receiving side terminal equipment) and how to identify the data flow of filling etc., this increased the EOC network-termination device physical layer realize difficulty.
In order to solve the drawback of Fig. 3, two kinds of methods shown in Figure 4, the present invention proposes the method for packing of physical layer frame in a kind of new EOC network, specifically comprise the steps:
The 1st step, IDLE frame of data link layer structure of the sending side terminal equipment of EOC network.Described IDLE frame is ethernet frame, have the criteria field of the ethernet frames such as DA (destination address), SA (source address), Length/Type (length/type), Data (data), FCS (Frame Check Sequence), but do not comprise actual active data in the IDLE frame.
The 2nd step, the physical layer of the sending side terminal equipment of EOC network all is encapsulated as a physical layer frame with all ethernet frames in the period, with all ethernet frames in the period as the data division of physical layer frame, added the frame head of physical layer frame before this data division, and/or add the postamble of physical layer frame after this data division.Described frame head and/or postamble comprise physical layer channel information, and all interior ethernet frames of period are shared these physical layer channel information.
The ground that matches with it, the data link layer of the sending side terminal equipment of EOC network all is transmitted to physical layer with all ethernet frames in the period.The ethernet frame here comprises two kinds, and a kind of is data Ethernet frame, the ethernet frame that to be exactly data link layer form the packet encapsulation of upper strata (network layer please refer to OSI seven layer network models); Another kind is the IDLE frame of data link layer structure.
When the data link layer of the sending side terminal equipment of EOC network have the physical layer of offering, when preparing to be encapsulated as the data Ethernet frame of physical layer frame (during data link layer Consecutive forwarding data Ethernet frame), data link layer is to physical layer forwarding data ethernet frame, and physical layer encapsulates these data Ethernet frame into current physical layer frame.
When the data link layer of the terminal equipment of EOC network do not offer physical layer, when preparing to be encapsulated as the data Ethernet frame of physical layer frame (when data link layer generation data Ethernet frame is interrupted), data link layer forwards described IDLE frame to physical layer, and physical layer encapsulates these IDLE frames into current physical layer frame.
When the data link layer of the terminal equipment of EOC network have no progeny in data Ethernet frame, when having again data Ethernet frame to offer physical layer, need the district in two kinds of situation: a kind of situation is that the current free time of physical layer (is that data link layer finishes to the nearest IDLE frame that physical layer provides, IPG in the time next IDLE frame also do not provide), to physical layer, physical layer encapsulates this data Ethernet frame into current physical layer frame to data link layer with this data Ethernet frame forwarding immediately.Another kind of situation is the current IDLE frame that encapsulating of physical layer, and this IDLE frame encapsulation such as data link layer is transmitted to this data Ethernet frame physical layer after complete again, and physical layer encapsulates this data Ethernet frame into current physical layer frame again.
The purpose of the IDLE frame that the present invention constructs is for physical layer can be encapsulated in the process of a plurality of ethernet frames a physical layer frame, when situation that data link layer generation data Ethernet frame is interrupted, be used for free time between the padding data ethernet frame.The IDLE frame of filling itself does not have any significant data, therefore sends, receives the IDLE frame and really can waste a part of physical layer bandwidth.But the frame head of physical layer frame and/or postamble much larger than the size of IDLE frame, therefore totally still can be saved the physical layer bandwidth under balance usually.For the physical layer bandwidth that reduce IDLE frame is wasted, it is the smaller the better that the frame length of IDLE frame arranges, and recommends to be set to minimum frame length 64 bytes of ethernet frame.
See also Fig. 6, in EOC network of the present invention, the de-encapsulation method of physical layer frame is:
In the 1st step, the physical layer of the receiving side terminal equipment of EOC network extracts the data division of each physical layer frame, reverts to one or more ethernet frames;
In the 2nd step, the physical layer of the receiving side terminal equipment of EOC network then judges whether comprise the IDLE frame in these ethernet frames, and other ethernet frames of getting rid of the IDLE frame are judged as one or more data Ethernet frame, is transmitted to data link layer.
The present invention can set some special fields or special content is set in one or more fields when structure IDLE frame, and the recipient can identify and distinguish IDLE frame and data Ethernet frame easily like this.For example, all fields of IDLE frame all can be filled to 0x00 (0x represents hexadecimal).The physical layer of receiving side terminal equipment is in case find from the ethernet frame that the physical layer frame data division recovers like this, have DA and SA be all 0x00 namely be judged as the IDLE frame, other ethernet frames of removing the IDLE frame are exactly data Ethernet frame.
The physical layer of the receiving side terminal equipment of EOC network includes but not limited to the processing of IDLE frame:
One, the physical layer of the receiving side terminal equipment of EOC network abandons the IDLE frame, does not send data link layer to.
Its two, the quantity of the IDLE frame that the physical layer of the receiving side terminal equipment of EOC network statistics receives in each physical layer frame, shared byte ratio etc.
For each ethernet frame, its front all has the lead code of 8 bytes, and its back all has 12 byte frame intervals.In the EOC network, common ethernet frame lead code is that the 1st, 2,4,5 bytes are defaulted as 0x55, the 3rd byte is SLD (Start LLID Delimiter, the LLID starting delimiter), be defaulted as 0xd5, the 6th～7 byte is LLID (Logical Link Identifier basically, logical link identifier), the 8th byte is CRC8 (Cyclic Redundancy Check, cyclic redundancy check (CRC) symbol).
The present invention can also construct the lead code of IDLE frame in structure IDLE frame, can be on the basis of existing lead code the content of some or a plurality of bytes be redefined.Being defined as the ethernet frame that this lead code of expression closelys follow thereafter during for example with the 7th byte value 0xFD of lead code is the IDLE frame.When the receiving side terminal equipment of EOC network recovers ethernet frame from physical layer frame like this, can judge according to lead code the 7th byte of each ethernet frame front whether this ethernet frame is the IDLE frame.
Above-described embodiment is only for signal, in the situation that do not violate the principle of the invention and thought, change and modification that above-described embodiment is done are within all should regarding as protection scope of the present invention.
In sum, encapsulation and the de-encapsulation method of physical layer frame in EOC network of the present invention, both guaranteed that in the period, all data Ethernet frame all were encapsulated as a physical layer frame transmission, make these data Ethernet frame can share physical layer channel information, overcome again the data Ethernet frame disruption of data link layer, thereby improved the physical layer bandwidth efficiency of EOC network.
Claims (9)
1. the method for packing of physical layer frame in an EOC network, is characterized in that, comprises the steps:
The 1st step, the data link layer structure IDLE frame of the sending side terminal equipment of EOC network, described IDLE frame is the ethernet frame that does not comprise actual valid data;
The 2nd step, the physical layer of the sending side terminal equipment of EOC network is encapsulated as a physical layer frame with all ethernet frames in the period, with the data division of all ethernet frames in the described period as physical layer frame, added the frame head of physical layer frame before this data division, and/or add the postamble of physical layer frame after this data division; Described frame head and/or postamble comprise physical layer channel information, all interior ethernet frames of period are shared these physical layer channel information, wherein for half-duplex EOC network, a described period is a descending period or a up period, and for full duplex EOC network, a described period is a downstream cycle or a upper line period;
The data link layer of the sending side terminal equipment of EOC network all is transmitted to physical layer with all ethernet frames in the period; When data link layer has data Ethernet frame to forward, forward described data Ethernet frame to physical layer; When data link layer forwards without data Ethernet frame, forward described IDLE frame to physical layer.
2. the method for packing of physical layer frame in EOC network according to claim 1, it is characterized in that, described method is in the 2nd step, after the data link layer of the sending side terminal equipment of EOC network forwards without data Ethernet frame, when having data Ethernet frame to forward again, need the district in two kinds of situation:
A kind of situation is the current free time of physical layer, data link layer with this data Ethernet frame forwarding immediately to physical layer;
Another kind of situation is the current IDLE frame that encapsulating of physical layer, and this IDLE frame encapsulation such as data link layer is transmitted to physical layer with this data Ethernet frame after complete again.
3. the method for packing of physical layer frame in EOC network according to claim 1 and 2, is characterized in that, described data Ethernet frame is the ethernet frame that packet that the data link layer of the sending side terminal equipment of EOC network is sent network layer encapsulates formation.
4. the method for packing of physical layer frame in EOC network according to claim 1, is characterized in that, the frame length of described IDLE frame is 64 bytes.
5. the method for packing of physical layer frame in EOC network according to claim 1, is characterized in that, the content of described each field of IDLE frame is 0x00.
6. the method for packing of physical layer frame in EOC network according to claim 1, is characterized in that, described method is in the 1st step, and the data link layer of the sending side terminal equipment of EOC network is also constructed the lead code of IDLE frame.
7. the de-encapsulation method of physical layer frame in an EOC network, is characterized in that, comprises the steps:
in the 1st step, the physical layer of the receiving side terminal equipment of EOC network extracts the data division of each physical layer frame, recovers the one or more ethernet frames in the period, wherein for half-duplex EOC network, a described period is a descending period or a up period, and for full duplex EOC network, a described period is a downstream cycle or a upper line period, all ethernet frames in a wherein said period are by the physical layer encapsulation of the sending side terminal equipment in the EOC network, and all ethernet frames in the described period are used as the data division of described physical layer frame, added the frame head of physical layer frame before this data division, and/or add the postamble of physical layer frame after this data division, described frame head and/or postamble comprise physical layer channel information, and all interior ethernet frames of period are shared these physical layer channel information,
The 2nd step, the physical layer of the receiving side terminal equipment of EOC network judges the IDLE frame that whether comprises in described one or more ethernet frame by the data link layer structure of the sending side terminal equipment in the EOC network, other ethernet frames of getting rid of the IDLE frame are judged as one or more data Ethernet frame, wherein said IDLE frame is the ethernet frame that does not comprise actual valid data, and when data link layer forwards without data Ethernet frame, forward described IDLE frame by the data link layer of the sending side terminal equipment in the EOC network to physical layer; Wherein when data link layer had data Ethernet frame to forward, the data link layer of the sending side terminal equipment in the EOC network was to physical layer forwarding data ethernet frame.
8. the de-encapsulation method of physical layer frame in EOC network according to claim 7, it is characterized in that, described method is in the 2nd step, the physical layer of the receiving side terminal equipment of EOC network judges in described one or more ethernet frame whether comprise the IDLE frame according to the content of the lead code of each field contents of described one or more ethernet frames and/or described one or more ethernet frames.
9. the de-encapsulation method of physical layer frame in EOC network according to claim 7, it is characterized in that, described method is in the 2nd step, and the physical layer of the receiving side terminal equipment of EOC network abandons the IDLE frame, and adds up quantity, the shared byte ratio of IDLE frame in each physical layer frame that receives.
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| CN105577237B (en) * | 2015-12-18 | 2019-03-12 | 国网河南省电力公司安阳供电公司 | A kind of modulation-demo-demodulation method and chip for low-voltage power line carrier communication system |
| CN112825505A (en) * | 2019-11-20 | 2021-05-21 | 西安诺瓦星云科技股份有限公司 | Communication state detection method, display controller and module controller |
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