CN101778025B - Ethernet transmission device and method suitable for transmission rate lower than 1 kilomega - Google Patents
Ethernet transmission device and method suitable for transmission rate lower than 1 kilomega Download PDFInfo
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Abstract
The invention discloses an ethernet transmission device suitable for transmission rate lower than 1 kilomega, which comprises at least one single pair of differential line interfaces, a local sender and a local receiver, wherein the single pair of differential line interfaces are coupled with the local sender; the local sender is used for sending local signals to the single pair of differential line interfaces; and the local receiver is used for receiving opposite terminal signals of the single pair of differential line interfaces. Because the technical scheme of the invention realizes signal receiving and sending through the same pair of differential lines, the number of ethernet transmission lines with the rate below 1000M is reduced, and the cost is saved.
Description
Technical Field
The present invention relates to the field of ethernet communications, and in particular, to an ethernet transmission apparatus and method suitable for a transmission rate lower than a gigabit rate.
Background
The physical layer access chip in the existing market has various main specifications such as 10/100M self-adaptation, Gigabit Ethernet (GE), 10GE and the like. The main function of such chips is to perform physical layer processing of ethernet signals, and the external form includes an interface to a transmission line and an interface to a MAC layer.
Each external physical port of the conventional 10/100M adaptive physical layer chip needs to use 4 transmission lines, i.e. two pairs of differential lines, where one pair of differential lines is dedicated for transmission and the other pair of differential lines is dedicated for reception, as shown in fig. 1. The communication state of the physical layer chip can be in a full-duplex mode or a half-duplex mode. When the 10/100M adaptive physical layer chip works in a full-duplex communication mode, a differential line pair used for sending and a differential line pair used for receiving work simultaneously; when the 10/100M adaptive physical layer chip operates in the half-duplex communication mode, the differential line pair used for transmission and the differential line pair used for reception operate in a time-sharing manner, that is, when the physical layer processing chip receives data, two transmission lines are in an idle state, and when the physical layer processing chip transmits data, two reception lines are in an idle state.
Therefore, no matter the 10/100M adaptive physical layer chip is in a full-duplex or half-duplex communication mode, each external physical port needs to use 4 transmission lines. In the technology using ethernet, for example, when broadband access to a cell is performed by using ethernet, since the number of users in the cell is very large, the access distance from the central office to the user end varies from several meters, several tens of meters to several kilometers, and 4 transmission lines are required for each external physical port of the conventional 10/100M physical layer chip, the cost of the existing 10/100 ethernet broadband access is relatively high due to the manufacturing cost of the transmission lines themselves and the installation cost of the transmission lines between the central office and the user end.
Disclosure of Invention
The invention aims to provide an Ethernet transmission device and method suitable for the rate lower than gigabit transmission rate, so as to reduce the number of transmission lines required in the conventional 10/100M Ethernet broadband access and further reduce the wiring cost.
In order to solve the technical problems, the invention aims to realize the following technical scheme: an Ethernet transmission device suitable for the transmission rate lower than giga comprises at least one single pair of differential line interfaces, a local transmitter and a local receiver coupled with the same single pair of differential line interfaces, wherein,
the local transmitter is used for transmitting a local signal to the single-pair differential line interface;
and the local receiver is used for receiving the opposite-end signal from the single-pair differential line interface.
The local receiver includes a channel separation unit to separate transmission and reception channels.
Preferably, when the single pair of differential line interfaces operate in a full-duplex communication mode, the channel separation unit is an echo cancellation unit, and is configured to restore an opposite-end signal according to a signal obtained from the single pair of differential line interfaces and a local signal provided by a local transmitter.
Preferably, when the single pair of differential line interfaces operate in a half-duplex communication mode, the channel separation unit is a collision detection unit configured to detect whether a signal collision exists on a pair of differential lines connected to the single pair of differential line interfaces; if there is a conflict, the local transmitter suspends transmitting local signals to the single pair of differential line interfaces.
Preferably, the system further comprises a control unit, configured to configure a 2-wire/4-wire transmission mode, a full duplex/half duplex operation mode, and/or a maximum transmission flow rate per unit time.
Preferably, when more than two single-pair differential line interfaces belong to one external physical port, the single-pair differential line interfaces of the external physical port work in parallel.
A method of ethernet transmission suitable for sub-gigabit transmission rates, the method comprising the steps of:
a, sending a local signal to an opposite terminal through at least one single pair of differential lines; and b, receiving the opposite-end signal transmitted from the opposite end through a single-pair differential line used for sending the local signal.
Preferably, a mode of separating the sending and receiving channels is adopted, and a single pair of differential lines used for sending the local signal is used for receiving the opposite-end signal transmitted from the opposite end.
Preferably, if the mobile terminal operates in the half-duplex communication mode, the method for separating the transmitting channel from the receiving channel specifically includes: detecting whether signal collision exists on the single pair of differential lines; and if the conflict exists, suspending sending the local signal to the single pair of differential lines.
Preferably, if the mobile terminal operates in the full-duplex operating mode, the method for separating the transmitting channel from the receiving channel specifically includes: and restoring the opposite-end signal according to the signal received on the single-pair differential line used for sending the local signal and the local signal.
Preferably, the method further comprises configuring a 2-wire/4-wire transmission mode, a full duplex/half duplex operation mode and/or a maximum transmission flow rate in unit time.
Preferably, if more than two single pair of differential lines serve one external physical port, the single pair of differential lines work in parallel.
According to the technical scheme, the Ethernet transmission device applicable to the rate lower than the gigabit transmission rate comprises at least one single-pair differential line interface, wherein each single-pair differential line interface corresponds to a local transmitter and a local receiver which are coupled with the single-pair differential line interface, and the local transmitter is used for transmitting a local signal to the single-pair differential line interface; the local receiver is used for receiving the opposite-end signal from the single-pair differential line interface. Therefore, each differential line interface can send data outwards and receive data from the opposite end, so that when the Ethernet physical layer transmission with the speed of below 1000M is carried out, each external physical port only needs one single pair of differential line interfaces (one pair of differential lines), the number of transmission lines needed in the conventional 10/100M Ethernet broadband access is reduced, and the operation cost is reduced.
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FIG. 1 is a schematic diagram of a conventional 10/100M physical layer chip transmission structure;
fig. 2 is a schematic structural diagram of an ethernet transmission device according to a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of an ethernet transmission device according to a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of an ethernet transmission device according to a third embodiment of the present invention;
fig. 5 is a schematic structural diagram of an ethernet transmission device according to a fourth embodiment of the present invention;
fig. 6 is a flowchart of a first embodiment of an ethernet transmission method according to the present invention;
fig. 7 is a flowchart illustrating an ethernet transmission method according to a second embodiment of the present invention.
Detailed Description
Please refer to fig. 2, which is a schematic structural diagram illustrating a first embodiment of an ethernet transmission apparatus according to the present invention, the apparatus is suitable for a transmission rate below 1000M and operates in a full duplex communication mode, i.e., transmitting and receiving are performed simultaneously.
The transmission device comprises a single pair of differential line interfaces 11 connected to a pair of differential transmission lines 10, a first local transmitter 13 and a first local receiver 12 coupled to the single pair of differential line interfaces 11, wherein the first local receiver 12 comprises an echo cancellation unit 121. The first local transmitter 13 is configured to transmit a local signal to the single-pair differential line interface 11; the first local receiver 12 is configured to receive peer-to-peer signals from the single pair of differential line interfaces 11.
In the present embodiment, the single pair of differential line interfaces 11 mainly refers to interfaces between the first local receiver 12, the first local transmitter 13, and the pair of differential transmission lines 10. It should be noted that when the transmission device of the present invention is at a chip level, the interface can be regarded as a logic interface, which is only used to indicate that a pair of differential transmission lines is connected thereto.
Since the single pair of differential line interfaces 11 is coupled to both the first local transmitter 13 and the first local receiver 12, the transmission apparatus of the present embodiment performs signal transmission through the same pair of differential transmission lines 10. The internal structure of the transmission device of the present embodiment will be further described with reference to the operation principle of the transmission device of the present embodiment.
In the transmit direction, the first local transmitter 13 transmits the local physical layer signal that needs to be transmitted to the opposite end to the single pair differential line interface 11.
In the receive direction, the first local receiver 12 receives the opposite-end signal from the single-pair differential line interface 11. As mentioned above, the transmission apparatus in this embodiment operates in a full-duplex communication mode, so that the pair of differential transmission lines 10 carries a peer-to-peer signal sent locally to the peer end at the same time as the peer-to-local signal, that is, a mixed signal of the local signal and the peer-to-peer signal superimposed together is transmitted on the differential transmission lines 10.
Thus, the signal obtained by the first local receiver 12 from the single pair of differential line interfaces 11 is a mixed signal in which the opposite-end signal and the local signal are added together. In order to obtain the actual opposite-end signal from the mixed signal, an echo cancellation unit 121 is provided in the first local interface. The echo cancellation unit 121 obtains not only the mixed signal from the single-pair differential line interface 10 but also the local physical layer transmission signal transmitted to the single-pair differential line interface 11 from the first local transmitter 13.
According to the existing Digital Signal Processing (DSP) technology, if it is known that the signal a and the signal B are superimposed together to form a mixed signal, and either one of the two signals is known, another unknown signal can be restored through DSP processing. The echo cancellation unit 121 according to the present invention can restore the original opposite-end signal by using the existing DSP technology when knowing the local signal and the mixed signal obtained by adding the opposite-end signal and the local signal together.
As can be seen from the above description, when the ethernet physical layer transmission apparatus of the present invention operates in the full-duplex communication mode, the transmission of the physical layer signals of both parties can be realized only through a pair of differential lines.
Please refer to fig. 3, which is a schematic structural diagram illustrating an ethernet transmission apparatus according to a second embodiment of the present invention, the apparatus is suitable for transmission rates below 1000M and operates in a half-duplex communication mode, i.e., only receiving and not transmitting or only transmitting and not receiving (different receiving and transmitting).
The transmission apparatus of the present embodiment includes a single pair of differential line interfaces 11 connected to a pair of differential transmission lines 10, and a second local transmitter 23 and a second local receiver 22 coupled to the single pair of differential line interfaces 11, where the second local receiver 22 includes a collision detection unit 221. Wherein, the second local transmitter 23 is configured to transmit a local signal to the single pair of differential line interfaces 11; the second local receiver 22 is used to receive the opposite-end signal from the single-pair differential line interface 11.
As can be seen from the above description, the main difference between the present embodiment and the first embodiment is that the collision detection unit in the second local receiver 22 replaces the echo cancellation unit 121 in the first local receiver 12 in the first embodiment. The above change is caused by a change in the communication mode of the transmission apparatus, the communication mode of the first embodiment is full duplex, and the communication mode of the present embodiment is half duplex.
The main purpose of the collision detection unit 221 is to ensure that when receiving an opposite-end signal through the differential transmission line 10, a local signal is not sent to the differential transmission line 10, so as to meet the requirement of the half-duplex communication mode. In practical applications, there are many collision detection implementations, such as collision detection based on the amplitude of the voltage signal, because if there is a superimposed mixed signal on the differential line 10, the amplitude of the voltage signal is greatly different from the amplitude of the normal signal; for example, the signals received from the single-pair differential line interface 11 and the local signals transmitted from the second local transmitter 23 to the single-pair differential line interface 11 are compared to determine whether they match. If the two signals are consistent, no conflict is proved, and the opposite end signal transmitted from the opposite end does not exist on the differential line 10; if they are not the same, it is indicated that there is a peer-to-peer signal transmitted from the peer-to-peer device on the differential transmission line 10 or other transmitters are transmitting signals (referring to the conventional bus situation), i.e. there is a collision on the differential line 10.
In summary, if the collision detection unit 221 detects a collision on the differential transmission line 10, the second local transmitter 23 stops transmitting data to the single-pair differential line interface 11, and performs a randomized delay transmission process to reduce the possibility of a transmission collision occurring again at both ends when retransmitting. In other words, the transmission or non-transmission of the second local transmitter 23 is affected by the collision detection unit 221, which is different from the first local transmitter 13 in the first embodiment.
Therefore, when the ethernet physical layer transmission device of the present invention operates in the half-duplex communication mode, the transmission of the physical layer signals of both sides can be realized by only one pair of differential lines.
Referring to fig. 4, which is a schematic structural diagram of an ethernet transmission device according to a third embodiment of the present disclosure, the transmission device of this embodiment can operate in a full-duplex communication mode or a half-duplex communication mode. The transmission apparatus in this embodiment includes a plurality of single-pair differential line interfaces 11, and each single-pair differential line interface 11 corresponds to a third local receiver 32 and a third local transmitter 33, where each two differential line interfaces constitute an external physical port, and each external physical port is configured with a control register 41, and the control register can control each third local receiver 32 and third local transmitter 33 belonging to the physical port. For convenience of description, fig. 4 shows only an internal structure of the transmission device corresponding to one external physical port, and a description is made accordingly, and other external physical ports not shown are the same as the external physical ports.
The third local receiver 32 can be regarded as an integration of the first local receiver 12 and the second local receiver 22, and similarly, the third local transmitter 33 corresponds to an integration of the first local transmitter 13 and the second local transmitter 23, and further, the third local receiver 32 and the third local transmitter 33 can operate in either a full-operation communication mode (in this case, corresponding to the first embodiment) or a half-duplex communication mode (in this case, corresponding to the second embodiment). As to which communication mode to operate in, the setting may be performed by a control bit in the control register 41, for example, the control bit is "0", which indicates that the pair of external physical ports operate in the full-duplex communication mode; a control bit of "1" indicates that the pair of physical ports is operating in half-duplex communication mode. It should be appreciated that even though there is only one single pair of differential line interfaces per physical port, it may be provided with a control bit indicating the communication mode.
In addition, the control register 41 may also be used to set the 2-wire/4-wire transfer mode of the pair of external physical ports. The method is to set the value of a certain transmission mode control bit to determine whether the interfaces of a single pair of differential lines for transmission and the interfaces of a single pair of differential lines for reception are the same, and further to determine whether the differential lines for externally transmitting the local signal are the same as the differential lines for receiving the opposite-end signal. Taking the external physical port shown in fig. 4 and including two single-pair differential line interfaces 11 as an example, assuming that the transmission mode control bit value is "1" indicating that a 2-line transmission mode is adopted, then both receiving and transmitting will be performed through one of the two single-pair differential line interfaces 11; if the transmission mode control bit value is "0" indicating that the 4-wire transmission mode is adopted, one of the two differential line interfaces 11 is used for receiving an opposite-end signal, and the other is used for sending a local signal to the outside.
Assuming that a 4-wire transmission mode is adopted, the upper layer single pair of differential line interfaces 11 in fig. 4 are selected to be used for sending a local signal to the outside, and the lower layer single pair of differential line interfaces 11 are used for receiving an opposite-end signal. Then, the transmitter and receiver coupled to the two single pair differential line interfaces 11 are changed accordingly.
Specifically, the third local transmitter 33 coupled to the upper layer single pair differential line interface 11 is turned off, and the echo cancellation unit 121 in the third local receiver 32 coupled to the upper layer single pair differential line interface 11 is also turned off; the third local receiver 32 coupled to the lower single pair differential line interface 11 is turned off. In addition, the collision detection unit 221 in the third local receiver 32 coupled to the upper layer single pair differential line interface 11 is switched to control the third local transmitter 33 coupled to the lower layer single pair differential line interface 11.
It should be noted that, as described above, each single pair of differential line interfaces 11 corresponds to a set of local transceivers, and is logically described. In a specific implementation, a set of transceiver may be used to control two (or more than two) single pair differential line interfaces 11, as shown in fig. 5.
When the external physical port in fig. 5 operates in the 2-line transmission mode, the control register 41 selects only one single pair of differential line interfaces 11 for the third local receiver 32 and the third local transmitter 33 to perform signal transmission. If the upper layer single pair differential line interface 11 is selected for signal transmission, the coupling link 52 of the third local transmitter 33 and the lower layer single pair differential line interface 11, and the coupling link 53 of the third local receiver 32 and the lower layer single pair differential line interface 11 are both equivalent to the open circuit state; and vice versa.
When the external physical port in fig. 5 works in the 4-line transmission mode, it is assumed that the lower single-pair differential line interface 11 is selected to be dedicated to externally sending the local signal, and the upper single-pair differential line interface 11 is dedicated to receiving the opposite-end signal. Then, the coupling link 52 of the third local transmitter 33 and the lower layer single pair differential line interface 11, and the coupling link 50 of the third local receiver 32 and the upper layer single pair differential line interface 11 are equivalent to the path state; and the coupling link 51 of the third local transmitter 33 and the upper layer single pair differential line interface 11, and the coupling link 53 of the third local receiver 32 and the lower layer single pair differential line interface 11 are equivalent to the open state. Furthermore, the echo cancellation unit 121 in the third local receiver 32 is switched off.
Since each external physical port of the conventional 10/100M ethernet physical layer chip uses two pairs of differential lines (4 lines) for transmission, the 2-line/4-line selectable transmission device shown in this embodiment can be well compatible with the conventional 4-line transmission technology.
Further, the maximum transmission traffic per unit time of each external physical port can also be set by the control register 41. For example, if the maximum sending traffic per unit time of the external physical port is set to be 30M, this means that the unit traffic of the peer-to-peer signal that is allowed to be transmitted to the local by the peer is 70M (assuming that the maximum total traffic per unit time is 100M), and thus asymmetric uplink and downlink traffic can be obtained. By using the method, when two physical ports are in one-to-one half duplex communication, the flow rates which can be sent and received by the two sides are different. Especially, the method has great significance for Ethernet broadband access users, and operators can adjust the unit maximum sending flow of each physical port in time according to the user flow statistical result, so as to reasonably distribute the maximum transmission capacity of cables (differential line transmission lines) and achieve the purpose of optimal configuration.
Preferably, in order to improve the transmission efficiency, when more than two single-pair differential line interfaces belong to one external physical port, the single-pair differential line interfaces included in the external physical port can work in parallel. For example, suppose that a certain external physical port of the ethernet physical layer transmission apparatus of the present invention includes 2 single-pair differential line interfaces, and when ethernet signal transmission with a rate of 1000M or less is performed, the 2 single-pair differential line interfaces operate simultaneously (both full duplex and half duplex), and transmit signals in parallel, where each single-pair differential line interface is used for both receiving signals and transmitting signals. Of course, the number of the single pair of differential line interfaces working in parallel in each physical port is not limited to 2, and can be set reasonably according to the requirements of actual communication quality and speed.
It should be noted that, although the control register 41 may have a plurality of control bits to realize the selection control of a plurality of functional modes, it should not be understood that the control bits must exist at the same time. In practical application, one or more control bits can be selected arbitrarily according to the requirements of the application environment, and even in the case of single application environment, the control register can not be set.
The ethernet transmission apparatus applicable to the lower than gigabit transmission rate of the present invention is described in detail above by three embodiments, and there are several points to be described for the embodiments:
(1) in order to be compatible with the 4-wire transmission technology of the existing 10/100M physical layer chip, each external physical port of the ethernet transmission device of the present invention may be designed to include two single-pair differential wire interfaces, and during transmission, a 2-wire or 4-wire transmission mode is selected according to the configuration of the control register, that is, one single-pair differential wire interface or two single-pair differential wire interfaces are selected for transmission.
For example, when broadband access is performed to a subscriber by using the ethernet technology, if a telephone line (including a pair of differential lines) is already installed between the subscriber and the central office, the ethernet transmission device (instead of the existing 10/100M physical layer chip) applicable to a rate of 1000M or less according to the present invention can be used at the subscriber and the central office, respectively, and a 2-line mode is configured in the control register, so that an operator can directly perform ethernet broadband access by using the telephone line without re-laying a cable including two pairs of differential lines. Even if no telephone line is available and the cable needs to be laid again, the number of transmission lines for carrying out Ethernet transmission with the speed of less than 1000M can be halved by adopting the two-wire technology of the transmission device, and the aim of reducing the cost is also achieved.
Of course, the ethernet transmission apparatus of the present invention may also be designed in a 2-wire (one pair of differential wires) transmission manner without considering compatibility with the existing 10/100M transmission technology, in which case each physical port may only include one single pair of differential wire interfaces.
(2) Since the main difference between the ethernet transmission device applicable to the sub-gigabit transmission rate of the present invention and the existing 10/100M physical layer chip lies in the front end part of transmission and reception, what processing (such as physical layer coding, transmission coding, etc.) is specifically performed before the local physical layer signal is transmitted, and what physical layer processing is performed after the opposite end signal is received is not a matter of concern of the present invention, and the specific implementation of this part should not be construed as a limitation to the present invention. Also for the above reasons, the local transmitter and the local receiver in the ethernet transmission apparatus of the present invention are a broad concept.
Taking the transmitter as an example, it may be considered that it has various signal processing functions before the existing physical layer chip transmits to the outside, such as scrambling code encoding, physical layer encoding, and transport encoding, and the above processing performed by the transmitter is collectively referred to as a physical layer transmission processing unit. And after the physical layer sending and processing unit carries out corresponding physical layer processing on the code stream from the MAC layer, the code stream is sent to the single-pair differential line interface. The transmitter is further controlled by a collision detection unit if the ethernet transmission device is in a half-duplex communication mode, and stops transmitting when the collision detection unit detects a collision on the line. If the Ethernet transmission device is in a full-duplex communication mode, no limitation is imposed on the transmission direction, and even if opposite-end signals are carried on a single-pair differential line transmission line, the signals are transmitted as usual.
Similarly, the receiver can be considered to include various signal processing functions, such as transmission decoding, scrambling code decoding, physical layer decoding, etc., after the existing physical layer chip receives the peer signal, and the above processing performed by the receiver can be collectively referred to as a physical layer receiving processing unit. When the receiver obtains the opposite end signal transmitted from the opposite end from the single pair of differential line ports, the physical layer receiving processing unit performs subsequent physical layer processing, such as transmission decoding, scrambling code decoding, physical layer decoding and the like. It should be noted that, if the receiver operates in the half-duplex communication mode, the receiver may directly perform various subsequent physical layer processes after receiving signals from the single pair of differential lines; if the receiver works in a full-duplex communication mode, the original opposite-end signal needs to be restored by the echo cancellation unit and then subsequent physical layer processing is carried out.
Further, the transmitter and receiver in the ethernet transmission apparatus of the present invention may even contain a processing section of the MAC layer, based on a technology in which an existing MAC layer chip and physical layer chip can be integrated into one chip. In summary, the transmitter may be regarded as a transmission channel, and the receiver may be regarded as a reception channel, and there is no limitation as to which signal processing units are specifically included in the transmission channel and the reception channel. The transmitting front end and the receiving front end only need to adopt the receiving and transmitting collinear technical scheme disclosed by the invention.
The invention also discloses an Ethernet transmission method suitable for the transmission rate lower than the kilomega. Please refer to fig. 6, which is a flowchart illustrating an ethernet transmission method according to a first embodiment of the present invention, wherein a half-duplex communication mode is adopted in the present embodiment.
Step 610: detecting whether an opposite-end signal exists on at least one single-pair differential line, and if the opposite-end signal does not exist, entering a step 620; if there is a peer signal, step 640 is entered.
Because the transmission process adopts a half-duplex communication mode, namely only receiving and not transmitting or only transmitting and not receiving, when the local signal is transmitted outwards, whether a signal (opposite-end signal) transmitted from an opposite end exists on a single pair of differential transmission lines is detected, so that the local signal is not transmitted outwards while the opposite-end signal is received. In addition, in order to provide the transmission rate, if more than two differential lines serve one physical port, the single pair of differential lines may work in parallel, which is described in detail above and will not be described herein again.
Step 620: and sending the local signal to the opposite terminal through the single pair of differential lines. And if only one single pair of differential lines is adopted for transmission, transmitting the physical layer signal to be transmitted to the opposite terminal through the single pair of differential lines.
Step 630: and receiving an opposite-end signal transmitted from an opposite end through a single-pair differential line used in sending. Since information interaction is two-way, the opposite end also needs to transmit signals to the opposite end locally, and the opposite end is called as an opposite end signal for distinguishing from the local signal. The single pair of differential lines used in transmission is also used to receive the opposite-end signal.
Step 640: the external transmission of the local signal is stopped, and the random delay transmission processing is performed, and the operation of step 610 is performed at certain time intervals.
Please refer to fig. 7, which is a flowchart illustrating a second embodiment of an ethernet transmission method according to the present invention, wherein a full duplex communication mode is adopted in the present embodiment.
Step 710: and transmitting the local signal to the opposite terminal through at least one single pair of differential lines. And if only one single pair of differential lines is adopted for transmission, transmitting the physical layer signal to be transmitted to the opposite terminal through the single pair of differential lines. Preferably, in order to provide the transmission rate, if more than two differential lines serve one physical port, a parallel operation mode may be adopted, which is described in detail above and will not be described herein again.
Step 720: and restoring the opposite-end signal according to the signal received on the single-pair differential line used for transmitting the local signal and the local signal. Since information interaction is two-way, the opposite end also needs to transmit signals to the opposite end locally, which is called as opposite end signals. Since the full-duplex communication mode is adopted in the transmission process, the single pair of differential transmission lines carries both the local signal and the opposite-end signal, and the two signals are superposed together to form a mixed signal. Therefore, the opposite-end signal needs to be restored from the mixed signal on the single-pair differential line locally, so that the subsequent physical layer processing can be performed. According to the existing DSP technology, under the condition that a mixed signal formed by an opposite end signal and a local signal is known, and a sent local signal is also known, the opposite end signal can be restored from the mixed signal.
Preferably, in order to be compatible with the existing 10/100M ethernet 4-wire transmission technology, a 2-wire/4-wire transmission mode can be configured in advance, and the 2-wire transmission mode is reduced by half compared with the transmission line data used by the 4-wire transmission mode, thereby saving the cost. Of course, a full duplex/half duplex operation mode and a maximum transmission traffic per unit time may also be configured for each external physical port, and please refer to the above description.
From the above description, it can be known that the present invention can receive a very significant cost reduction effect in the ethernet access; for example, for the application of each cell in a city, in the process of building a house of the cell, a telecommunication service provider has laid two telephone lines for each family, and in fact, most families use only one telephone line and the other telephone line is idle. The collinear receiving and transmitting technology of the invention can utilize the idle telephone line as broadband access, thereby saving huge wiring cost. For some rural residents, although there are no idle telephone lines in their homes, it is much cheaper to newly install a telephone line than to install fiber optic cables and network cables. With the progress of long-distance Ethernet transceiving technology, the transmission distance of the Ethernet is greatly improved at present; therefore, the Ethernet access application based on the invention has very high cost performance compared with the existing popular access mode.
The ethernet transmission apparatus and method applicable to a transmission rate lower than gigabit rate provided by the present invention are described in detail above, and a specific example is applied in the present document to illustrate the principle and the implementation manner of the present invention, and the description of the above embodiment is only used to help understanding the method of the present invention and the core idea thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (6)
1. An Ethernet transmission device suitable for the transmission rate lower than the kilomega is characterized by comprising at least one single-pair differential line interface, a local transmitter and a local receiver, wherein the local transmitter and the local receiver are coupled with the same single-pair differential line interface; wherein,
the local transmitter is used for transmitting a local signal to the single-pair differential line interface;
the local receiver is used for receiving the opposite-end signal from the single-pair differential line interface;
the local receiver comprises a conflict detection unit for detecting whether signal conflicts exist on a pair of differential lines connected with the single pair of differential line interfaces; if there is a conflict, the local transmitter suspends transmitting local signals to the single pair of differential line interfaces.
2. An ethernet transport device according to claim 1, further comprising a control unit for configuring a 2-wire/4-wire transport mode and/or a maximum transmission traffic per unit time.
3. The ethernet transport apparatus of claim 1, wherein when more than two single pair differential line interfaces belong to an external physical port, the single pair differential line interfaces of the external physical port operate in parallel.
4. A method for ethernet transmission suitable for sub-gigabit transmission rates, said method comprising the steps of:
a, sending a local signal to an opposite terminal through at least one single-pair differential line, wherein the single-pair differential line interface works in a half-duplex communication mode;
b, receiving an opposite terminal signal transmitted from an opposite terminal through a single pair of differential lines used for sending the local signal;
detecting whether signal collision exists on the single pair of differential lines; and if the conflict exists, suspending sending the local signal to the single pair of differential lines.
5. The Ethernet transmission method according to claim 4, further comprising configuring a 2-wire/4-wire transmission mode and/or a maximum transmission traffic per unit time.
6. An ethernet transmission method according to claim 4, wherein if more than two single pair of differential lines serve one external physical port, said single pair of differential lines work in parallel.
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| EP3261298A1 (en) | 2016-06-23 | 2017-12-27 | Kyland Technology Co., Ltd. | Method for implementing a real-time industrial internet field broadband bus |
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| CN114302000B (en) * | 2021-11-24 | 2023-10-20 | 深圳市三旺通信股份有限公司 | PHY negotiation degradation method, device, equipment and storage medium |
| CN116192352B (en) * | 2023-04-24 | 2023-12-29 | 苏州艾利特机器人有限公司 | Physical layer communication method for half-duplex serial communication |
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| CN1267408A (en) * | 1997-05-16 | 2000-09-20 | 夸尔柯姆股份有限公司 | Method of and apparatus for detecting and preventing message collisions in communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP3261298A1 (en) | 2016-06-23 | 2017-12-27 | Kyland Technology Co., Ltd. | Method for implementing a real-time industrial internet field broadband bus |
| US10164785B2 (en) | 2016-06-23 | 2018-12-25 | Kyland Technology Co., Ltd. | Method for implementing a real-time industrial internet field broadband bus |
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