CN108965435B - Distance-enhanced Ethernet transmission method - Google Patents
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- CN108965435B CN108965435B CN201810794667.1A CN201810794667A CN108965435B CN 108965435 B CN108965435 B CN 108965435B CN 201810794667 A CN201810794667 A CN 201810794667A CN 108965435 B CN108965435 B CN 108965435B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
- H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
- H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
- H04L69/323—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions in the physical layer [OSI layer 1]
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Abstract
The invention relates to the technical field of information, in particular to a distance-enhanced Ethernet transmission method which is applied to a bidirectional transmission process between a first physical layer of a first communication terminal and a second physical layer of a second communication terminal through a single channel; the single channel adopts a transmission medium to connect the first physical layer and the second physical layer; the Ethernet transmission method comprises the following steps: judging whether the transmission distance of the transmission medium is smaller than a preset threshold value in real time; if yes, setting the transmission rate between the first physical layer and the second physical layer to be a preset transmission rate, wherein the range is 90-110 Mbit/s; if not, setting the transmission rate between the first physical layer and the second physical layer to 1/10 of the preset transmission rate, wherein the range is 9-11 Mbit/s; by the technical scheme, the efficiency and the stability under a short distance are both considered in the signal transmission between the first communication terminal and the second communication terminal, so that the problem of limitation of the Ethernet transmission distance is improved to a certain extent, and the cost is lower.
Description
Technical Field
The invention relates to the technical field of information, in particular to a distance-enhanced Ethernet transmission method.
Background
The ethernet physical layer is located at the lowest layer of an OSI (Open System Interconnection, OSI for short) reference model, and implements a physical interface between devices, as shown in fig. 1. Ethernet generally uses twisted pair cables, coaxial cables, or the like as a physical medium to transmit data at a rate of 10Mbit/s, or 100Mbit/s, or 1000Mbit/s, or higher. The ethernet physical layer needs to define implementation schemes from a Media Independent Interface (MII) of a Media Access Control (MAC) layer to an MDI (Media Dependent Interface, MDI for short) of a physical medium.
The distance that can be transmitted between the point-to-point of the Ethernet physical layer is related to the frequency of the transmitted data, the higher the frequency is, the greater the channel attenuation is, the more serious the intersymbol interference is, and the shorter the transmission distance is. Fig. 2 shows the attenuation of five types of twisted pairs with a length of 100 meters, and the attenuation of the signal increases sharply with increasing frequency. Taking the 802.3bw ethernet standard established by IEEE as an example, when 100Mbits/s of data is transmitted over one (pair of) five twisted pairs, the limit connection length is about 250 meters.
In practical applications of ethernet, however, a connection at a greater distance is often required. As in video surveillance systems, the distance between the monitoring probe and the storage system may exceed 500 meters. In the current solution, a relay system, such as a switch, is usually adopted to divide the connection into several segments, which increases the complexity of the system and increases the overall cost.
Disclosure of Invention
In view of the above problems, the present invention provides a distance-enhanced ethernet transmission method, which is applied to a bidirectional transmission process performed between a first physical layer of a first communication terminal and a second physical layer of a second communication terminal through a single channel;
the single channel connects the first physical layer and the second physical layer by adopting a transmission medium;
the Ethernet transmission method comprises the following steps:
judging whether the transmission distance of the transmission medium is smaller than a preset threshold value or not in real time;
if so, setting the transmission rate between the first physical layer and the second physical layer as a preset transmission rate, wherein the range is 90-110 Mbit/s;
and if not, setting the transmission rate between the first medium special interface and the second medium special interface to 1/10 of the preset transmission rate, wherein the range is 9-11 Mbit/s.
In the ethernet transmission method, the first physical layer includes a first medium-specific interface and a first medium-dependent interface connected to each other;
the second physical layer comprises a second medium-specific interface and a second medium-related interface which are connected;
the single channel connects the first media dependent interface and the second media dependent interface using the transmission medium.
In the ethernet transmission method, the first medium-dedicated interface and the second medium-dedicated interface both transmit under the control of a clock signal;
changing a transmission rate between the first medium-specific interface and the second medium-specific interface by adjusting a frequency of the clock signal.
In the ethernet transmission method, the data transmitted in each clock cycle of the first medium dedicated interface and the second medium dedicated interface is 4 bits;
when the transmission distance is smaller than the preset threshold value, setting the frequency of the clock signal of the first medium special interface and the second medium special interface to be 22.5-27.5 MHz;
and when the transmission distance is greater than the preset threshold value, setting the frequency of the clock signal of the first medium special interface and the second medium special interface to be 2.25-2.75 MHz.
In the above ethernet transmission method, when the transmission distance of the transmission medium is smaller than the preset threshold, the symbol rates of the first medium-related interface and the second medium-related interface are further set to a preset symbol rate, where the range is 61.7 to 71.7 MBaud/s;
and when the transmission distance of the transmission medium is greater than the preset threshold value, setting the symbol rates of the first medium-related interface and the second medium-related interface to be 1/10 of the preset symbol rate, wherein the range is 6.17-7.17 MBaud/s.
In the above ethernet transmission method, when the first medium-dependent interface and/or the second medium-dependent interface is/are used as a receiving party, echo cancellation is performed on the received signal.
In the ethernet transmission method, the preset threshold is 250-350 m.
In the ethernet transmission method, the first medium-dependent interface has a first transmission voltage; the second media dependent interface has a second transmit voltage;
when the transmission distance is smaller than the preset threshold value, setting the first sending voltage of the first medium-related interface as a first rated voltage, and setting the sending voltage of the second medium-related interface as a second rated voltage;
when the transmission distance is greater than the preset threshold value, the transmission voltage of the first medium-related interface is set to a third rated voltage greater than the first rated voltage, and the transmission voltage of the second medium-related interface is set to a fourth rated voltage greater than the second rated voltage.
In the ethernet transmission method, the third rated voltage is 110% to 140% of the first rated voltage; and
the fourth rated voltage is 110% -140% of the second rated voltage.
Has the advantages that: according to the distance-enhanced Ethernet transmission method provided by the invention, the signal transmission between the first communication terminal and the second communication terminal is ensured to have both short-distance efficiency and long-distance stability, so that the problem of Ethernet transmission distance limitation is improved to a certain extent, and the cost is lower.
Drawings
Fig. 1 is a schematic diagram of a physical layer structure in a conventional OSI reference model;
FIG. 2 is a graph of the average change in attenuation versus frequency for five types of twisted pairs of 100 meters;
FIG. 3 is a flowchart illustrating steps of a distance enhanced Ethernet transmission method according to an embodiment of the present invention;
FIG. 4 is a waveform diagram of clock signals, enable signals and data symbols for the first media specific interface and/or the second media specific interface at short distances in one embodiment of the invention;
FIG. 5 is a waveform diagram of clock signals, enable signals, and data symbols for the first media specific interface and/or the second media specific interface over long distances in one embodiment of the invention;
fig. 6 is a waveform diagram of signals output by the first media dependent interface and/or the second media dependent interface in an embodiment of the invention.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
In a preferred embodiment, as shown in fig. 3, a distance-enhanced ethernet transmission method is proposed, wherein the method can be applied to a bidirectional transmission process between a first physical layer of a first communication terminal and a second physical layer of a second communication terminal through a single channel;
the single channel adopts a transmission medium to connect the first physical layer and the second physical layer;
the Ethernet transmission method can comprise the following steps:
judging whether the transmission distance of the transmission medium is smaller than a preset threshold value in real time;
if yes, setting the transmission rate between the first physical layer and the second physical layer to a preset transmission rate, wherein the preset transmission rate ranges from 90 to 110Mbit/s (megabits/second), and for example, the preset transmission rate can be 92.5Mbit/s, 97.5Mbit/s, 100Mbit/s, 102.5Mbit/s and the like;
if not, the transmission rate between the first physical layer and the second physical layer is set to 1/10 of the preset transmission rate, and the range is 9-11 Mbit/s, for example, 9.25Mbit/s, or 9.75Mbit/s, or 10Mbit/s, or 10.25 Mbit/s.
In the above technical solution, because of the bidirectional transmission, both the first communication terminal and the second communication terminal can be used as a transmitting end and a receiving end of a signal, that is, it can be considered that both the first communication terminal and the second communication terminal are integrated with a transmitting unit and a receiving unit, and the transmitting unit and the receiving unit can also be combined to form a receiving-transmitting mixed module; the transmission distance can be acquired before the transmission distance is judged in real time, and the specific acquisition mode can be that parameters which are prestored and represent the transmission distance and the like are read from a storage module; the transmission medium employed for a single channel may be formed by a physical medium such as twisted pair or coaxial cable.
In a preferred embodiment, the first phy includes a first media specific interface and a first media dependent interface coupled;
the second physical layer comprises a second medium special interface and a second medium related interface which are connected;
the single channel connects the first media dependent interface and the second media dependent interface using a transmission medium.
In the above embodiment, preferably, the first medium-dedicated interface and the second medium-dedicated interface can both transmit under the control of a clock signal;
the transmission rate between the first medium-specific interface and the second medium-specific interface is changed by adjusting the frequency of the clock signal.
In the above embodiment, preferably, the data transmitted in each clock cycle of the first medium-specific interface and the second medium-specific interface may be 4 bits;
when the transmission distance is smaller than a preset threshold value, the frequency of the clock signal of each of the first medium dedicated interface and the second medium dedicated interface can be 22.5-27.5 MHz (megahertz), for example, 24MHz, 25MHz, 26MHz, and the like;
when the transmission distance is greater than the preset threshold, the frequencies of the clock signals of the first medium dedicated interface and the second medium dedicated interface as the transmitters may be both 2.25 to 2.75MHz, for example, 2.4MHz, 2.5MHz, or 2.6 MHz.
In the above technical solution, as shown in fig. 4, each clock cycle of the clock signal TX _ CLK of the first medium-specific interface and/or the second medium-specific interface at a short distance corresponds to one data unit in the 4-bit data TX _ D, and the high level of the enable signal TX _ EN defines the data TX _ D to be transmitted; when the enable signal TX _ EN is in a low level, the data TX _ D is invalid; after the period of each pulse is adjusted from 40ns (nanoseconds) to 400ns in fig. 5, the transmitted data volume is reduced to 1/10, which can be suitable for long-distance transmission; fig. 6 reflects the case where the period of the signal at the first medium dependent interface and/or the second medium dependent interface corresponds to the waveform of the signal after adjusting from 15ns to 150ns, where the signal transitions slowly and is attenuated by the channel much less, so that it can be transmitted over a greater distance.
In the above embodiment, preferably, when the transmission distance of the transmission medium is smaller than the preset threshold, the symbol rates of the first medium-dependent interface and the second medium-dependent interface are further set to be a preset symbol rate, which is in a range of 61.7 to 71.7MBaud/s (mega baud/second), for example, 65MBaud/s, or 66.7MBaud/s, or 67MBaud/s, etc.;
when the transmission distance of the transmission medium is greater than the preset threshold, the symbol rates of the first medium-dependent interface and the second medium-dependent interface are further set to 1/10 of the preset symbol rate, where the range is 6.17 to 7.17MBaud/s, and for example, the symbol rates may be 6.5MBaud/s, 6.67MBaud/s, or 6.7 MBaud/s.
In the above technical solution, there may be a preset association between the symbol rates of the first medium-related interface and the second medium-related interface and the transmission voltages thereof.
In the above embodiment, preferably, the first medium dependent interface and/or the second medium dependent interface may perform echo cancellation on the received signal when acting as a receiving side.
In the above embodiment, preferably, the first medium dependent interface has a first transmission voltage; the second media dependent interface has a second transmit voltage;
when the transmission distance is smaller than the preset threshold value, setting a first sending voltage of the first medium-related interface as a first rated voltage, and setting a sending voltage of the second medium-related interface as a second rated voltage;
when the transmission distance is greater than the preset threshold value, the transmission voltage of the first medium-related interface is set to be a third rated voltage greater than the first rated voltage, and the transmission voltage of the second medium-related interface is set to be a fourth rated voltage greater than the second rated voltage.
In the above embodiment, preferably, the third rated voltage is 110% to 140% of the first rated voltage; and
the fourth rated voltage is 110% to 140% of the second rated voltage, for example, the ratio may be 122%, or 124%, or 125%, or 126%, or 128%, etc.
In the above technical solution, for example, the first rated voltage may be 1.0V (volt); the second nominal voltage may be 1.0V; the third nominal voltage may be 1.2V; the fourth nominal voltage may be 1.2V.
In a preferred embodiment, the predetermined threshold is 250-350 m (meters), for example, 260m, 270m, 280m, 290m, 300m, 310m, 320m, etc.
In summary, the distance-enhanced ethernet transmission method provided by the present invention is applied to a bidirectional transmission process performed between a first physical layer of a first communication terminal and a second physical layer of a second communication terminal through a single channel; the single channel adopts a transmission medium to connect the first physical layer and the second physical layer; the Ethernet transmission method comprises the following steps: judging whether the transmission distance of the transmission medium is smaller than a preset threshold value in real time; if so, setting the transmission rate between the first physical layer and the second physical layer as a preset transmission rate, wherein the range is 90-110 Mbit/s; if not, setting the transmission rate between the first physical layer and the second physical layer to be 1/10 of the preset transmission rate, wherein the range is 9-11 Mbit/s; by the technical scheme, the efficiency and the stability under a short distance are both considered in the signal transmission between the first medium special interface and the second medium special interface, so that the problem of limitation of the Ethernet transmission distance is improved to a certain extent, and the cost is lower.
While the specification concludes with claims defining exemplary embodiments of particular structures for practicing the invention, it is believed that other modifications will be made in the spirit of the invention. While the foregoing invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment.
Various alterations and modifications will no doubt become apparent to those skilled in the art after having read the above description. Therefore, the appended claims should be construed to cover all such variations and modifications as fall within the true spirit and scope of the invention. Any and all equivalent ranges and contents within the scope of the claims should be considered to be within the intent and scope of the present invention.
Claims (6)
1. A distance enhanced Ethernet transmission method is characterized in that the method is applied to a bidirectional transmission process which is carried out between a first physical layer of a first communication terminal and a second physical layer of a second communication terminal through a single channel;
the single channel connects the first physical layer and the second physical layer by adopting a transmission medium;
the Ethernet transmission method comprises the following steps:
judging whether the transmission distance of the transmission medium is smaller than a preset threshold value in real time;
if so, setting the transmission rate between the first physical layer and the second physical layer as a preset transmission rate, wherein the range is 90-110 Mbit/s;
if not, setting the transmission rate between the first physical layer and the second physical layer to be 1/10 of the preset transmission rate, wherein the range is 9-11 Mbit/s;
the first physical layer comprises a first media-specific interface and a first media-dependent interface connected;
the second physical layer comprises a second medium-specific interface and a second medium-related interface which are connected;
the single channel connects the first medium-dependent interface and the second medium-dependent interface using the transmission medium;
the first medium-specific interface and the second medium-specific interface are both used for transmission under the control of a clock signal;
changing a transmission rate between the first medium-specific interface and the second medium-specific interface by adjusting a frequency of the clock signal;
when the transmission distance of the transmission medium is smaller than the preset threshold value, setting the symbol rate of the first medium-related interface and the second medium-related interface as a preset symbol rate, wherein the range is 61.7-71.7 MBaud/s;
and when the transmission distance of the transmission medium is greater than the preset threshold value, setting the symbol rates of the first medium-related interface and the second medium-related interface to be 1/10 of the preset symbol rate, wherein the range is 6.17-7.17 MBaud/s.
2. The ethernet transmission method according to claim 1, wherein the data transmitted in each clock cycle of the first media specific interface and the second media specific interface is 4 bits;
when the transmission distance is smaller than the preset threshold value, setting the frequency of the clock signal of the first medium special interface and the frequency of the clock signal of the second medium special interface to be 22.5-27.5 MHz;
and when the transmission distance is greater than the preset threshold value, setting the frequency of the clock signal of the first medium special interface and the second medium special interface to be 2.25-2.75 MHz.
3. An ethernet transmission method according to claim 1, wherein the first medium dependent interface and/or the second medium dependent interface performs echo cancellation on the received signal when acting as a receiving side.
4. The Ethernet transmission method according to claim 1, wherein the predetermined threshold is 250-350 m.
5. An ethernet transmission method according to claim 1, wherein said first media dependent interface has a first transmit voltage; the second media dependent interface has a second transmit voltage;
when the transmission distance is smaller than the preset threshold value, setting the first sending voltage of the first medium-related interface as a first rated voltage, and setting the sending voltage of the second medium-related interface as a second rated voltage;
when the transmission distance is greater than the preset threshold value, the transmission voltage of the first medium-related interface is set to a third rated voltage greater than the first rated voltage, and the transmission voltage of the second medium-related interface is set to a fourth rated voltage greater than the second rated voltage.
6. The Ethernet transmission method according to claim 5, wherein the third rated voltage is 110-140% of the first rated voltage; and
the fourth rated voltage is 110-140% of the second rated voltage.
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| CN1881979A (en) * | 2005-05-31 | 2006-12-20 | 杭州华为三康技术有限公司 | Ethernet physical layer low-speed transmission realizing method and its applied network apparatus |
| CN1890913A (en) * | 2003-12-08 | 2007-01-03 | 硅谷数模半导体有限公司 | Signaling and coding methods and apparatus for long-range 10 and 100 Mbps Ethernet transmission |
| CN1946086A (en) * | 2006-10-27 | 2007-04-11 | 杭州华为三康技术有限公司 | Transmission method and device for supporting non-standard speed rate |
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| US20110122891A1 (en) * | 2009-11-25 | 2011-05-26 | Broadcom Corporation | Variable Rate Twisted pair, Backplane and Direct Attach Copper Physical Layer Devices |
| CN206402225U (en) * | 2017-05-12 | 2017-08-11 | 江苏新创光电通信有限公司 | 10/100M adaptive ethernet coaxial cable transceivers |
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| CN1890913A (en) * | 2003-12-08 | 2007-01-03 | 硅谷数模半导体有限公司 | Signaling and coding methods and apparatus for long-range 10 and 100 Mbps Ethernet transmission |
| CN1881979A (en) * | 2005-05-31 | 2006-12-20 | 杭州华为三康技术有限公司 | Ethernet physical layer low-speed transmission realizing method and its applied network apparatus |
| CN1946086A (en) * | 2006-10-27 | 2007-04-11 | 杭州华为三康技术有限公司 | Transmission method and device for supporting non-standard speed rate |
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