WO2008052452A1 - Procédé de configuration, système et dispositif émetteur-récepteur pour transmission de données ethernet - Google Patents

Procédé de configuration, système et dispositif émetteur-récepteur pour transmission de données ethernet Download PDF

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Publication number
WO2008052452A1
WO2008052452A1 PCT/CN2007/070576 CN2007070576W WO2008052452A1 WO 2008052452 A1 WO2008052452 A1 WO 2008052452A1 CN 2007070576 W CN2007070576 W CN 2007070576W WO 2008052452 A1 WO2008052452 A1 WO 2008052452A1
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WIPO (PCT)
Prior art keywords
coaxial
signal
transmission
access point
module
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Application number
PCT/CN2007/070576
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English (en)
Chinese (zh)
Inventor
Yang Yu
Weizhou Li
Original Assignee
Hangzhou H3C Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN2006101429556A external-priority patent/CN101174976B/zh
Priority claimed from CN2007100023840A external-priority patent/CN101227294B/zh
Application filed by Hangzhou H3C Technologies Co., Ltd. filed Critical Hangzhou H3C Technologies Co., Ltd.
Publication of WO2008052452A1 publication Critical patent/WO2008052452A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0803—Configuration setting

Definitions

  • Ethernet data transmission configuration method system and transceiver
  • the present invention relates to data transmission technologies, and more particularly to a method, system and transceiver for configuring Ethernet data transmission in a coaxial distribution network. Background of the invention
  • a television program signal is transmitted by a front end through an optical fiber to an optical node close to a user, and the optical node converts the received signal into an electrical signal and transmits it to each resident's home through a coaxial distribution network.
  • the coaxial distribution network is a network with a large constant attenuation, the network typically includes a floor amplifier capable of amplifying the received signal to compensate for the attenuation during signal transmission.
  • the broadcasting and television coaxial cable distribution network also includes a distributor, a brancher, and a coaxial terminal.
  • Each building is equipped with a floor amplifier, and each unit of the building including a multi-family unit corresponds to a distributor port, wherein the distributor is connected to the floor amplifier; each floor or several floors in the unit corresponds to one A splitter, wherein each splitter is connected to one port of the distributor, and each branch port corresponds to a household, and the user can receive the television program signal through the coaxial terminal in the home.
  • the transmission of Ethernet data can be divided into the upstream direction from the coaxial terminal to the Ethernet access point and the downstream direction from the Ethernet access point to the coaxial terminal.
  • the configuration process is usually used to determine various parameters that need to be used in the transmission process.
  • Ethernet transmission technology is used in a coaxial distribution network, it is necessary to determine the transmission frequency of the physical layer between the Ethernet access point and the coaxial terminal, and the physical layer between the Ethernet access point and the coaxial terminal. Transmit the occupied frequency resources and the transmission and reception parameters such as the transmit and receive levels, and must meet the coaxial terminal and the Ethernet access point as the signal source to communicate at the physical layer, and the coaxial terminals do not communicate with each other at the physical layer. .
  • FIG. 1 is a schematic structural diagram of a conventional Ethernet physical layer data transmission and reception device.
  • the Ethernet physical layer data transmission transceiver comprises: an analog interface 110, an analog-to-digital (AD)/digital-to-analog (DA) conversion module 120, a codec module 130, and a medium access control (MAC) layer interface. Module 140.
  • the transceiver device first synthesizes the MAC layer data to be transmitted received from the MAC layer interface module 140 into physical layer data, and then the codec module 130 performs the pre-selected coding mode.
  • the encoding process is performed, and the encoded digital signal is converted into an analog signal by the AD/DA conversion module 120 through the DA conversion process, and then transmitted to the distributor connected to itself through the analog interface 110 in the transceiver device to complete the data transmission in the uplink direction.
  • the AD/DA conversion module 120 obtains the digital signal through the AD conversion process, and then the pre-selected by the codec module 130.
  • the decoding method performs a decoding operation, extracts MAC layer data from the obtained data stream, and outputs the data to the MAC layer interface module 140 to complete data transmission in the downlink direction.
  • the coaxial distribution network is a network with a large fixed attenuation loss. If the existing Ethernet physical layer data transmission transceiver device as shown in FIG. 1 is directly disposed in the coaxial terminal, Since the device does not consider the fixed attenuation loss in the coaxial distribution network, the amplitude of the signal transmitted to the Ethernet access point after the transmission through the coaxial distribution network is greatly reduced; similarly, as After the signal from the Ethernet access point of the signal source is transmitted to the coaxial terminal through the coaxial distribution network, the amplitude thereof is also greatly reduced, so that in the case of the physical layer technology based on the existing Ethernet standard, the Ethernet interface Incoming and coaxial terminals cannot receive Ethernet data from each other normally. Moreover, the transceiver does not consider how to avoid mutual communication between the coaxial terminals, and thus cannot ensure that the coaxial terminals do not communicate with each other at the physical layer.
  • the present invention provides a method for configuring Ethernet data transmission, which enables the coaxial terminal to communicate with the signal source at the physical layer, and the coaxial terminals do not communicate with each other at the physical layer.
  • a data transmission configuration method in a coaxial distribution network comprising:
  • the parameter is used to ensure that the Ethernet access point communicates with each coaxial terminal at the physical layer, and the coaxial terminals do not communicate with each other at the physical layer.
  • the present invention also provides an Ethernet data transmission configuration system, which enables the coaxial terminal to communicate with the signal source at the physical layer, and the coaxial terminals do not communicate with each other at the physical layer.
  • the method includes: a configuration module, configured to calculate an attenuation loss between the Ethernet access point and each coaxial terminal, and between the coaxial terminal and the coaxial terminal, according to the Attenuation loss, obtaining transmission and reception parameters corresponding to the physical layer between the Ethernet access point and the coaxial terminal, and transmitting the obtained transmission and reception parameters to the coaxial terminal.
  • the invention fully considers the attenuation loss between the Ethernet access point and each coaxial terminal when calculating the parameters of the physical layer transmission and reception, and therefore, the transmitted Ethernet signal can be attenuated and compensated to ensure Ethernet access.
  • the point and the coaxial terminal are interconnected at the physical layer; since the attenuation loss between the coaxial terminal and the coaxial terminal is also considered when calculating the parameters of the physical layer transmission and reception, the calculated transmission and reception parameters can be guaranteed
  • Each of the coaxial terminals cannot communicate with each other at the physical layer.
  • the attenuation loss between the Ethernet access point and the coaxial terminal is fully considered, and the obtained transmission and reception parameters can all be performed for the Ethernet signal transmitted in the coaxial distribution network.
  • Attenuation compensation eliminates the adverse effects of the inherent attenuation of the coaxial distribution network on Ethernet data transmission, which can greatly improve the signal quality and effectively avoid signal distortion caused by network loss.
  • FIG. 1 is a schematic structural diagram of a conventional Ethernet physical layer data transmission and reception device.
  • FIG. 2 is a schematic structural diagram of a coaxial distribution network.
  • Figure 3 is a schematic view of the appearance of a two-branch.
  • FIG. 4 is an exemplary flowchart of a method for configuring Ethernet data transmission in the present invention.
  • FIG. 5 is a flowchart of a method for configuring Ethernet data transmission according to Embodiment 1 of the present invention.
  • FIG. 6 is a schematic structural diagram of an Ethernet data transmission configuration system according to Embodiment 1 of the present invention.
  • FIG. 7 is a flowchart of a method for configuring Ethernet data transmission according to Embodiment 2 of the present invention.
  • FIG. 8 is a schematic structural diagram of an Ethernet data transmission/reception apparatus 1 according to Embodiment 2 of the present invention.
  • FIG. 9 is a schematic structural diagram of an Ethernet data transmission/reception apparatus 2 according to Embodiment 2 of the present invention. Mode for carrying out the invention
  • the configuration module may be added to the coaxial distribution network, and the configuration module corresponds to one or more of the Ethernet access point and the Ethernet access point.
  • the coaxial terminals are respectively connected to determine the attenuation characteristic parameters between the coaxial terminals of the Ethernet access point to the coaxial cable distribution network and the coaxial terminals, and configure Ethernet access
  • the physical layer such as the frequency resource occupied by the physical layer transmission of the point and the coaxial terminal, the effective spectrum range, and the physical layer transmit and receive levels transmit and receive parameters.
  • Figure 2 shows a schematic diagram of the structure of a coaxial distribution network.
  • the floor amplifier amplifies the broadcast signal from the signal source, ie from the Ethernet access point, and outputs it to the n-distributor.
  • the n-distributor distributes the received signal energy evenly to each unit, and outputs it to the corresponding branchers #11 to #nl of each unit.
  • FIG. 3 is a schematic diagram of the appearance of a conventional two-branch.
  • each brancher includes an input (IN) interface, an output (OUT) interface, and a plurality of branch (TYP) interfaces, wherein the IN interface receives signals from the n-distributor or the downstamp branch. Then, through the OUT interface and the TYP interface, the received signals are respectively output to the upper branch and the coaxial terminal, thereby forming a tree-shaped distribution network.
  • the brancher #11 of one layer receives the signal divided by the n-distributor through its own IN interface, and then transmits the signal to the two households in one floor through two TYP interfaces.
  • the coaxial terminal transmits the signal to the two-layer splitter #12 through the OUT interface.
  • the distributor # 16 can be used instead of the splitter. For example, if there are 2 coaxial terminals on the top layer, then the top-level splitter can be replaced with 2 splitters.
  • the attenuation loss between the IN port and the OUT port is called insertion loss
  • the attenuation loss between the IN port and the TYP port is called branch loss
  • the attenuation loss between the OUT port and the TAP port is known as reverse isolation loss
  • the attenuation loss between TYP ports is called mutual isolation loss
  • the insertion loss of each branch is less than the branch loss.
  • the above-mentioned insertion loss, reverse isolation loss, and mutual isolation loss of the splitter vary with the frequency of the transmitted signal. These losses are fixed when the branch is shipped from the factory. The network personnel can obtain various types of losses of the branch in a certain frequency band according to the product parameter table during use.
  • the coaxial distribution network as shown in Figure 2 has a fixed attenuation loss.
  • the Ethernet access point can be configured according to the fixed attenuation characteristic parameters between the Ethernet access points to the coaxial terminals of the coaxial cable distribution network and between the coaxial terminals and other coaxial terminals.
  • the physical layer transmitting and receiving parameters such as the frequency resources, the effective spectrum range, and the transmission and reception levels, are transmitted by the physical layer of the coaxial terminal to ensure the two-way interworking between the Ethernet access point and the coaxial terminal at the physical layer, and the coaxial terminal is the same.
  • the axis terminals do not communicate with each other at the physical layer.
  • FIG. 4 is an exemplary flowchart of a method for configuring Ethernet data transmission in the present invention.
  • the configuration method in the present invention supports point-to-multipoint Ethernet data transmission, and is applicable to a distribution network of a coaxial cable, and the method includes:
  • step 401 calculating an attenuation loss between the Ethernet access point and each coaxial terminal within the jurisdiction thereof, and calculating attenuation loss between the coaxial terminals within the jurisdiction of the Ethernet access point;
  • step 402 according to the calculated attenuation loss, the transmission and reception parameters corresponding to the physical layer between the Ethernet access point and the coaxial terminal are calculated and configured to ensure the Ethernet access point and each coaxial terminal. Interworking between the physical layers and between the coaxial terminals at the physical layer Pass.
  • the calculated sending and receiving parameters may include: a transmission frequency of a physical layer between the Ethernet access point and each coaxial terminal, and a physical layer transmission between the Ethernet access point and each coaxial terminal.
  • Frequency resource the effective spectrum range corresponding to the physical layer between the Ethernet access point and each coaxial terminal, the attenuation amplitude of the receivable voltage signal of the Ethernet access point and each coaxial terminal, and the coaxial terminal The amplitude of the voltage signal attenuation, the transmission level of each coaxial terminal, the reception threshold level of each coaxial terminal, and the transmission and reception level amplification of each coaxial terminal.
  • the attenuation loss based on the calculation of the transmission and reception parameters includes the attenuation loss between the Ethernet access point and the coaxial terminal, so that the transmitted Ethernet signal can be attenuated and compensated for the data from each coaxial.
  • the adverse effects of the attenuation loss of the coaxial distribution network can be eliminated, thereby improving the signal quality and effectively avoiding signal distortion caused by network loss.
  • the calculated transmission and reception parameters further include the non-coaxial terminal.
  • the amplitude of the received voltage signal attenuation that is, the unreceivable threshold of the coaxial terminal.
  • different unreceivable thresholds can be set for adjacent or relatively close coaxial terminals, so that adjacent or relatively close coaxial terminals cannot communicate with each other at the physical layer, that is, from an Ethernet access point. Signals transmitted to a particular coaxial terminal are not transmitted to other coaxial terminals in the physical layer, thereby ensuring that there is no mutual interference between the coaxial terminals.
  • the configuration module can be placed in different locations in the coaxial distribution network, such as between an Ethernet access point and each coaxial terminal, or an Ethernet access point device, or In the transceiver of the coaxial terminal. If the configuration module is set between the Ethernet access point and each coaxial terminal, or an Ethernet access point device, it can send these parameters to the corresponding coaxial terminals after calculating the transmission and reception parameters.
  • the transceiver device configures its own transmission and reception parameters according to the received information, and performs Ethernet data transmission based on the configured transmission and reception parameters; if the configuration is respectively set in the transceiver device of each coaxial terminal Module, after the configuration module calculates the transmission and reception parameters corresponding to the coaxial terminal where it is located, the transceiver device in which it is located can configure its transmission and reception parameters as the calculated transmission and reception parameters, and based on the configuration Send and receive parameters for Ethernet data transmission.
  • the transmission and reception parameters of the physical layer corresponding to each coaxial terminal are configured, and the physical access layer and the coaxial terminals can communicate with each other at the physical layer, and the coaxial terminals do not communicate with each other at the physical layer. , to achieve the transformation of the physical layer.
  • Ethernet transmission technology supports point-to-multipoint topology transmission and makes the same physical body corresponding to the same coaxial terminal.
  • the channel can transmit data in the uplink and downlink directions, so that Ethernet transmission can be applied in the coaxial distribution network.
  • the EPON technology adopts the broadcast mode in the downlink direction, so that the Ethernet access point as the signal source can realize point-to-multipoint transmission; the EPON technology is time-multiplexed in the uplink direction, thereby making each coaxial
  • the terminal is capable of transmitting signals to an Ethernet access point that is a signal source.
  • each coaxial terminal transmits data packets in its own time slot, so there is no collision, and no need to pass the Ethernet MAC layer protocol - carrier sense multiple access
  • the /conflict monitoring (CSMA/CD) protocol monitors each other to avoid transmission collisions and retry transmissions caused by transmission resource collisions during point-to-multipoint transmission, and disorderly contention of channels by coaxial terminals.
  • the MAC layer of the coaxial distribution network may also be modified by using other schemes than the EPON architecture.
  • a control module can be set in the coaxial distribution network, and the control module is respectively connected to the Ethernet access point and the plurality of coaxial terminals, and controls data transmission between the Ethernet access point and the plurality of coaxial terminals at the MAC layer.
  • the MAC layer of the coaxial distribution network may adopt a carrier sense multiple access/collision prevention (CSMA/CA) protocol, and the control module may implement the Ethernet access point and the coaxial terminal at the MAC layer based on the CSMA/CA protocol. Transmission control.
  • CSMA/CA carrier sense multiple access/collision prevention
  • the CSMA/CA protocol does not require each coaxial terminal to detect signals sent from each other to determine whether the transmission resources are in conflict, but each coaxial terminal sends an application message to the control module, and the control module uniformly allocates each.
  • each coaxial terminal uses which transmission resources, thereby realizing the occupation and arbitration of the transmission resources, and solving the conflict problem caused by simultaneously transmitting information on the network.
  • the configuration module and the control module for performing parameter calculation in the embodiment of the present invention may be applied to the system as a whole device, or may be separately placed in different positions as separate modules. Set.
  • the configuration module exists independently, the coaxial terminal and the Ethernet access point do not need to be physically modified, and the existing network equipment can be utilized to the greatest extent, thereby saving the network construction cost; when the configuration module is located inside the transceiver of the coaxial terminal At that time, only a small transformation on the cornerstone of the existing coaxial terminal is required, and the construction cost can also be saved.
  • the configuration module is disposed between the Ethernet access point and the coaxial terminal, or the Ethernet access point device, and includes an independent device configured with the module or an Ethernet access point device including the configuration module. That is, the Ethernet data transmission configuration device in this embodiment.
  • FIG. 5 is a flowchart of a method for configuring Ethernet data transmission according to Embodiment 1 of the present invention. As shown in Figure 5, the method includes the following steps:
  • step 501 the network topology of each branch device in the coaxial distribution network between the Ethernet access point and each coaxial terminal is determined.
  • the determined network topology may be a network structure similar to that shown in FIG. 2.
  • step 502 the attenuation loss between the Ethernet access point and each of the coaxial terminals and the attenuation loss between the coaxial terminals are calculated according to the determined network topology.
  • the existing attenuation loss includes: insertion loss of an n-distributor, insertion loss of 5 branches, branch loss of one branch, and attenuation loss of a coaxial closed path of about 50 meters, assuming an insertion loss of the n-distributor is 9 Decibel (dB), the insertion loss and branch loss of each branch are 3dB, and the 50m coaxial closed path is attenuated according to 5 ⁇ 65MHz.
  • the attenuation loss between the coaxial terminal and the coaxial terminal can be further calculated.
  • the attenuation loss between the coaxial terminal and the coaxial terminal may include attenuation loss between coaxial terminals connected to the same splitter, and attenuation between coaxial terminals connected to different splitters loss.
  • the attenuation loss between the coaxial terminals #111 and #112 is: the mutual isolation loss of the brancher #11, for example, 25 dB at 5 to 65 MHz; between the coaxial terminals #111 and #121
  • the attenuation loss between the coaxial terminals can be used as a basis for calculating the unreceivable threshold of the coaxial terminal in the subsequent step, so as to prevent mutual interference between the coaxial terminals.
  • steps 501 and 502 implement the operation of step 401 in the method shown in FIG.
  • step 503 based on the calculated attenuation loss, the attenuation characteristic parameter between the Ethernet access point and each coaxial terminal and the attenuation characteristic parameter of each coaxial terminal are determined.
  • the attenuation loss calculated in step 502 above is an estimate of the attenuation. Since the actual attenuation in the coaxial distribution network is related to the frequency band of the transmitted signal, for example, the insertion loss of a branch is 3.5 dB at 5 to 65 MHz. It is 3.8dB at 65 ⁇ 550MHz. Therefore, in this step, the attenuation characteristic parameter is determined according to the attenuation loss and the frequency band of the predetermined signal to be transmitted.
  • the determined attenuation characteristic parameter may further include an attenuation characteristic parameter between the coaxial terminals.
  • the attenuation characteristic parameter between each coaxial terminal is generally greater than an attenuation characteristic parameter between the Ethernet access point and each coaxial terminal.
  • step 504 the sending and receiving parameters corresponding to the physical layer between the Ethernet access point and each coaxial terminal are calculated according to the determined attenuation characteristic parameter, to ensure the Ethernet access point and each coaxial terminal. Interworking between the physical layers and the physical layers are not interworking between the coaxial terminals.
  • the sending and receiving parameters may include: a frequency resource occupied by the physical layer transmission between the Ethernet access point and each coaxial terminal, and a physical layer corresponding between the Ethernet access point and each coaxial terminal.
  • the effective spectrum range, the attenuation range of the receivable voltage signal of the Ethernet access point and each coaxial terminal may specifically include the following operations:
  • Al according to the transmission symbol rate and coding rule of the Ethernet, determine the transmission spectrum characteristics and the effective spectrum range to be transmitted, thereby determining the effective spectrum range used for transmission and reception; a2, the preset frequency band according to the bidirectional data channel of the coaxial distribution network And transmitting spectral characteristics to determine frequency resources occupied by the physical layer of the coaxial distribution network;
  • A3 Acquire an attenuation range of the receivable voltage signal between the Ethernet access point and the coaxial terminal according to the attenuation loss between the Ethernet access point and the coaxial terminal.
  • the Ethernet access point may be directly
  • the attenuation characteristic parameter with each coaxial terminal acts as the attenuation amplitude of the receivable voltage signal between the Ethernet access point and the coaxial terminal.
  • the attenuation amplitude in this step may also include the attenuation loss of the coaxial cable between the Ethernet access point and the coaxial terminal.
  • the sending and receiving parameters may further include: a voltage signal attenuation amplitude between each coaxial terminal, a transmission level of each coaxial terminal, and each coaxial
  • the receiving threshold level of the terminal and the transmission and receiving level magnification of each coaxial terminal further includes:
  • the attenuation characteristic parameter between the coaxial terminals is not available between the coaxial terminals.
  • the attenuation amplitude of the voltage signal is received to prevent mutual interference between the coaxial terminals.
  • the attenuation amplitude of the unreceivable voltage signal herein may also include the attenuation amplitude of the coaxial cable.
  • A5 determining a receivable signal level and an unreceivable signal level according to a fading amplitude of the receivable and unreceivable voltage signals, and a predetermined transmission level of the access point and the coaxial terminal physical layer chip; wherein, the receivable The signal level is greater than the unreceivable signal level.
  • the attenuation amplitude of the coaxial cable is also a non-negligible factor.
  • the network voltage attenuation is only about 2 dB.
  • A6 Determine a reception threshold level according to a receivable signal level and an unreceivable signal level, wherein the reception threshold level is any value between a receivable signal level and an unreceivable signal level.
  • an intermediate threshold level is taken as the reception threshold level (for example, 0.08V) between the access point and the coaxial terminal.
  • the physical layer chip only receives a voltage greater than the receiving threshold level and does not receive a voltage less than the receiving threshold level.
  • supporting Ethernet to perform point-to-multipoint transmission on the existing television coaxial network can be realized.
  • the signal source is connected to each coaxial terminal, and each coaxial terminal is also in communication with the signal source, and the coaxial terminals are not connected.
  • A7 Determine a transmission level amplification factor and a reception level amplification factor of the coaxial terminal according to the determined reception threshold level.
  • the transmission level amplification is determined to ensure that the signal level transmitted between the Ethernet access point and each coaxial terminal is higher than the reception threshold level, so that the coaxial terminal can receive from the Ethernet access point.
  • the signal that is, the Ethernet access point and the coaxial terminals are in communication; and the signal transmission between the coaxial terminals is lower than the receiving threshold level due to attenuation by the larger coaxial distribution network.
  • the coaxial terminal cannot receive signals directly from other coaxial terminals, that is, the coaxial terminals are not connected.
  • the receiving amplification factor is used to compensate for the signal from the Ethernet access point due to the attenuation generated by the coaxial distribution network.
  • the transmission amplification factor should be such that the coaxial terminal as the receiving side receives the voltage signal according to the IEEE 802.3 standard, without affecting its correct decoding; the receiving amplification factor should be such that after the received signal is amplified, its voltage amplitude is Within the range of the reception tolerance level specified by the IEEE 802.3 standard, the physical layer transceivers of the Ethernet access point and the coaxial terminal can better recognize the minimum signal amplitude.
  • the above-mentioned transmission and reception amplification factors may be determined to be any value larger than the quotient of the transmission level and the reception level, and the two amplification factors may be the same or different.
  • the calculation of the attenuation loss between the coaxial terminals can also be omitted.
  • the transmission and reception level amplification factors at this time are: any value greater than (the attenuation amplitude of the receivable signal / 20) 10 , and this The two magnifications can be the same or different.
  • the above steps 503 to 504 realize the operation process of calculating the sending and receiving parameters in the method shown in FIG. 4 .
  • the signal transmission frequency may also be different.
  • the coaxial terminal can encode the signal to be transmitted according to different signal transmission frequencies by different coding methods, so that after coding The transmitted signal enables more efficient use of spectrum resources. Different performance branching devices and/or different signal transmission frequencies may cause different degrees of deviation in the calculated attenuation loss.
  • the attenuation performance parameter is determined according to the mapping relationship between the preset transmission frequency, the branching device performance, the attenuation loss, and the attenuation performance parameter in step 503, and the attenuation performance is determined according to the determined attenuation performance in step 504.
  • the parameter calculates the transmit and receive parameters corresponding to the physical layer between the Ethernet access point and the coaxial terminal.
  • the accuracy of the transmitted and received parameters calculated in this embodiment is higher than the calculation of the transmission and reception parameters directly from the attenuation loss.
  • step 505 the calculated transmission and reception parameters corresponding to the physical layer between the Ethernet access point and each coaxial terminal are sent to the coaxial terminal.
  • each of the coaxial terminals configures the received transmit and receive parameters as transmission and reception parameters of its internal transceiver.
  • the physical layer transmission frequency between the Ethernet access point and the coaxial terminal, and the physical layer transmission between the Ethernet access point and the coaxial terminal are occupied.
  • Frequency resource effective spectrum range corresponding to the physical layer between the Ethernet access point and the coaxial terminal, attenuation of the receivable voltage signal between the access point and the coaxial terminal, transmission and reception of the coaxial terminal Level, magnification of the transmit and receive levels of the coaxial terminal, unreachable threshold of the coaxial terminal, etc.
  • the above steps 505 to 506 implement the operation process of configuring the sending and receiving parameters in the method shown in FIG.
  • the transmission resources used by each coaxial terminal and the time period of transmission may be uniformly allocated according to the application message reported by each coaxial terminal. Executing When a higher coaxial terminal issues a resource occupation request, a resource release operation may be performed on a coaxial terminal with a lower priority that is occupying the resource, so that a coaxial terminal with a higher priority can access the Ethernet in time. Point to achieve communication.
  • FIG. 6 is a schematic structural diagram of an Ethernet data transmission configuration system according to Embodiment 1 of the present invention.
  • the Ethernet data transmission configuration system in this embodiment includes a coaxial terminal and a configuration module.
  • the coaxial terminal is connected to an external Ethernet access point device for interaction with a connected Ethernet access point.
  • the configuration module is located in any device between the coaxial terminal and the Ethernet access point in the coaxial distribution network, and the device may also be located inside the Ethernet access point device.
  • the device including the configuration module is the Ethernet data transmission configuration device in this embodiment.
  • the configuration module calculates the transmission and reception parameters according to the flow shown in FIG. 5, and sends the parameters to the coaxial terminal, so that the configuration of the Ethernet data transmission can be realized, and the signal transmitted in the Ethernet can be attenuated and compensated. Improve signal quality.
  • the operations performed by the configuration module are: calculating the attenuation loss between the Ethernet access point and the coaxial terminal, and obtaining the transmission and reception parameters corresponding to the physical layer between the Ethernet access point and the coaxial terminal according to the attenuation loss. And send the obtained transmission and reception parameters to the coaxial terminal.
  • the Ethernet data transmission system further includes a control module, which can allocate a corresponding transmission resource and a transmission time period for each coaxial terminal, and transmit the transmission resource and the transmission time period information to the corresponding coaxial.
  • the terminal thereby realizing the occupation and arbitration of the transmission resources, and solving the conflict problem caused by simultaneously transmitting information on the network.
  • the control module can be in the same device as the configuration module, such as an Ethernet access device or other standalone device.
  • the frequency band distribution is from 5MHz to 1GHz, of which 65MHz to 1GHz is used as a TV program channel, and 5MHz ⁇ 65MHz is used as a two-way. Data channel usage. Therefore, in order to not affect the television service in the coaxial distribution network, the effective spectrum range can be set to 5 MHz to 65 MHz in this embodiment. The corresponding spectrum effective range can be determined according to the corresponding coding rule. In this way, the Ethernet data transmission can be implemented based on the coaxial distribution network without any influence on the existing services in the coaxial distribution network, thereby improving the practicability of the technical solution in this embodiment.
  • the configuration module is disposed in the transceiver of the coaxial terminal.
  • the transceiver device of the configuration module is included, that is, the Ethernet data transmission and transceiver device in this embodiment
  • FIG. 7 is a flowchart of a method for configuring Ethernet data transmission according to Embodiment 2 of the present invention. As shown in FIG. 7, the method for configuring Ethernet data transmission in this embodiment includes the following steps: Step 701: Determine a network extension of each branch device in a coaxial distribution network between an Ethernet access point and each coaxial terminal. Park structure.
  • Step 702 Calculate, according to the determined network topology structure, an attenuation loss between the Ethernet access point and each of the coaxial terminals, and an attenuation loss between the coaxial terminals.
  • Step 703 Determine, according to the calculated attenuation loss, an attenuation characteristic parameter between the Ethernet access point and each coaxial terminal, and an attenuation characteristic parameter between the coaxial terminals.
  • Step 704 Calculate, according to the determined attenuation characteristic parameter, a sending and receiving parameter corresponding to a physical layer between the Ethernet access point and each coaxial terminal, to ensure that the Ethernet access point and each coaxial terminal are between The physical layer communicates with each other, and the coaxial terminals do not communicate with each other at the physical layer.
  • the calculated sending and receiving parameters may include: an effective spectrum range, a frequency resource occupied by a physical layer between an Ethernet access point and a coaxial terminal in a coaxial distribution network, and an Ethernet access point.
  • the attenuation amplitude of the receivable voltage signal between the coaxial terminal and the coaxial terminal may include: an effective spectrum range, a frequency resource occupied by a physical layer between an Ethernet access point and a coaxial terminal in a coaxial distribution network, and an Ethernet access point.
  • the calculated transmission and reception parameters may include: attenuation amplitude, transmission level, and receivable signal of the unreceivable voltage signal between the coaxial terminals Flat and unreceivable signal level, receiving threshold Flat, Transmit Level Magnification and Receive Level Magnification.
  • the steps 701 to 704 are the same as the operations of the steps 501 to 504 in the first embodiment.
  • the main difference is that the operation of the steps 701 to 704 in the embodiment is performed by the internal transceiver of the coaxial terminal.
  • the module is implemented, and the operation of steps 501 to 504 in the first embodiment is implemented by a configuration module other than the coaxial terminal.
  • Step 705 The transmitting and receiving parameters calculated by the coaxial terminal according to the configuration module inside the transceiver device are configured as transmission and receiving parameters of the internal transceiver device.
  • the physical layer transmission frequency between the Ethernet access point and the coaxial terminal, and the physical layer transmission between the Ethernet access point and the coaxial terminal are occupied.
  • Frequency resource effective spectrum range corresponding to the physical layer between the Ethernet access point and the coaxial terminal, attenuation of the receivable voltage signal between the access point and the coaxial terminal, transmission and reception of the coaxial terminal Level, magnification of the transmit and receive levels of the coaxial terminal, unreachable threshold of the coaxial terminal, etc.
  • the transmission resources used by each coaxial terminal and the time period of transmission may be uniformly allocated according to the application message reported by each coaxial terminal.
  • the Ethernet data transmission configuration system in this embodiment includes an Ethernet access point device and a coaxial terminal connected through a coaxial distribution network.
  • the coaxial terminal internally includes a transceiver device, and the transceiver device further includes a configuration module.
  • the configuration module in this embodiment allocates corresponding transmission resources and time segments for each coaxial terminal, and transmits the transmission resources and time period information to the coaxial terminal.
  • FIG. 8 is a schematic structural diagram of an Ethernet data transmission/reception apparatus 1 according to Embodiment 2 of the present invention.
  • the Ethernet data transmission transceiver device 1 in this embodiment that is, the transceiver device of the coaxial terminal, includes: an interface module, an analog-to-digital/digital-to-analog (AD/DA) module, a codec module 130, and a MAC layer interface module 140.
  • the interface module herein may be the analog interface 110 in FIG. 8;
  • the AD/DA module may be divided into a digital/analog conversion module 880 and an analog/digital conversion module 840, respectively performing conversion of digital signals into analog signals and analog signals.
  • the operation of converting to a digital signal that is, the digital-to-analog conversion module 880 is used to convert the signal to be transmitted from the codec module 130 into an analog signal and output to the analog interface 110, and the analog/digital conversion module 840 is used to convert the analog interface.
  • the received signal is converted into a digital signal and output to the codec module 130; the codec module 130 sends the predetermined codec mode information to the configuration module, encodes the signal to be transmitted, and obtains the coded signal to be transmitted, and A signal amplified by the receiving amplification module is also received, and the received signal is decoded.
  • the transceiver device 1 in this embodiment further includes: a configuration module 800 and a transmission amplification module 860.
  • the configuration module 800 calculates the transmission and reception parameters according to the flow shown in FIG.
  • the sending and receiving parameters may include: an effective spectrum range, a frequency resource occupied by a physical layer between an Ethernet access point and a coaxial terminal in a coaxial distribution network, and an Ethernet access point and a coaxial terminal Can receive the attenuation amplitude of the voltage signal, the attenuation amplitude of the unreceivable voltage signal between the coaxial terminals, the transmission level, the receivable signal level and the unreceivable signal level, the reception threshold level, the transmission level amplification factor and the reception Level magnification.
  • the configuration module transmits the transmission level amplification to the transmission amplification module 860, and sends the effective spectrum range information and the frequency resource information corresponding to the physical layer between the Ethernet access point and the coaxial terminal to the analog interface 110. .
  • the transmission amplifying module 860 receives the transmission level amplification factor from the configuration module 800, amplifies the received signal according to the transmission level amplification factor, and outputs the amplified signal to the analog interface 110.
  • the Ethernet data transmission and transceiver apparatus 1 in this embodiment may further include: a receiving amplification module 810.
  • the configuration module 800 sends the receiving level amplification factor in the sending and receiving parameters to the receiving amplifying module 810; the receiving amplifying module 810, according to the receiving level amplification factor calculated by the configuration module 800, amplifies the received signal, and The amplified signal output.
  • the analog interface 110 receives the effective spectrum range information from the configuration module 800 and the frequency resource information corresponding to the physical layer between the Ethernet access point and the coaxial terminal, receives the signal from the transmitting amplification module 860, and uses the frequency.
  • the signal is sent to the outside on the resource, and a signal from the outside in the effective spectrum range is received, and the signal is sent to the receiving amplification module 810.
  • the Ethernet data transmission and reception device 1 in this embodiment may further include: a selection receiving module 820.
  • the selection receiving module 820 can be located between the receiving amplifying module 810 and the codec module 130, and according to the receiving threshold level calculated by the configuration module 800, distinguishing the levels of the receivable signal and the unreceivable signal, and selectively receiving the receiving amplification.
  • the selection receiving module 820 can also be located between the analog interface 110 and the receiving amplifying unit 810, according to the receiving threshold level calculated by the configuration module 800, distinguishing the levels of the receivable signal and the unreceivable signal, and selectively receiving the analog interface. 110 analog signal.
  • the analog interface 110 calculates the effective spectrum range according to the configuration module 800, the frequency resource occupied by the physical layer between the Ethernet access point and the coaxial terminal in the coaxial distribution network, and between the Ethernet access point and the coaxial terminal.
  • the transmit and receive parameters such as the attenuation amplitude of the received voltage signal, the attenuation amplitude of the unreceivable voltage signal between the coaxial terminals, and the transmission and reception of the signal.
  • the reception amplification module 810 and the selection reception module 820 may also be the same module, that is, the reception module 200. In this way, the Ethernet transmission/reception device 1 in this embodiment can compensate for the attenuation of the signal and ensure that the coaxial terminals cannot communicate with each other.
  • FIG. 9 is a schematic structural diagram of an Ethernet data transmission/reception apparatus 2 according to Embodiment 2 of the present invention.
  • the device 2 further includes a pre-emphasis module 870, a receive equalization module 830, and an inter-symbol interference cancellation module 850, as compared to the Ethernet data transmission transceiver device 1.
  • the pre-emphasis module 870 is located between the transmit amplification module 860 and the digital/analog conversion module 880, and is configured to perform pre-emphasis processing on the analog signal to be transmitted outputted by the digital/analog conversion module 880, and output the processed analog signal to the transmission.
  • Amplification module 860 is located between the transmit amplification module 860 and the digital/analog conversion module 880, and is configured to perform pre-emphasis processing on the analog signal to be transmitted outputted by the digital/analog conversion module 880, and output the processed analog signal to the transmission.
  • Amplification module 860 is located between the transmit amplification module 860 and the digital/analog conversion module 880, and is configured to perform pre-emphasis processing on the analog signal to be transmitted outputted by the digital/analog conversion module 880, and output the processed analog signal to the transmission.
  • Amplification module 860 is located between the transmit amplification module 860 and the digital/analog conversion module 8
  • the receiving equalization module 830 is configured to perform equalization processing on the analog signal output by the receiving module 200, and output the processed analog signal to the analog/digital conversion module 840.
  • the inter-symbol interference cancellation module 850 is configured to cancel the crosstalk signal in the digital signal output by the analog/digital conversion module 840, and output the digital signal from which the crosstalk signal is eliminated to the codec module 130.
  • the Ethernet data transmission device 2 in this embodiment can eliminate signal distortion caused by inter-symbol interference and mutual interference between transmission lines, and can be transmitted.
  • the signal is pre-emphasized to further improve signal quality.
  • the Ethernet data transmission system of this embodiment may further include a control module, which receives an application message sent by each coaxial terminal, and uniformly allocates transmission resources used by each coaxial terminal according to the received application message, and The time period corresponding to the transmission resource is used, thereby realizing the occupation and arbitration of the transmission resource, and solving the conflict problem caused by simultaneously transmitting the information on the network.
  • a control module which receives an application message sent by each coaxial terminal, and uniformly allocates transmission resources used by each coaxial terminal according to the received application message, and The time period corresponding to the transmission resource is used, thereby realizing the occupation and arbitration of the transmission resource, and solving the conflict problem caused by simultaneously transmitting the information on the network.
  • the effective spectrum range can also be set to 5MHz ⁇ 65MHz.
  • the corresponding spectrum effective range can be determined according to the corresponding coding rule. In this way, the Ethernet data transmission can be implemented based on the coaxial distribution network without any influence on the existing services in the coaxial distribution network, thereby improving the practicability of the technical solution in this embodiment.
  • the internal and external Ethernet data transmission transceivers may not include the configuration module, but the transmission and reception parameters are pre-configured within the Ethernet data transmission transceiver, but the transmission and reception parameters should be guaranteed according to the Ethernet.
  • the attenuation loss between the coaxial terminal where the network data transmission transceiver is located and its corresponding Ethernet access point is calculated.
  • an Ethernet data transmission transceiver includes: a transmission amplification module, a reception amplification module, and an interface module
  • a transmission level amplification factor is pre-configured in the transmission amplification module, and the transmission level is amplified according to the transmission level.
  • the receiving and amplifying module is pre-configured with a receiving level amplification factor, and amplifying the signal received from the interface module according to the receiving level amplification factor
  • the interface module is pre-configured with the effective spectrum range information and the frequency resource information corresponding to the physical layer between the Ethernet access point and the coaxial terminal, receives the signal from the transmitting and amplifying module, and sends the signal by using the corresponding frequency resource. To the outside, and receiving a signal from the outside in the effective spectrum range, the signal is sent to the receiving amplification module.
  • the pre-configured transmission level amplification factor, the reception level amplification factor, the effective spectrum range information, and the frequency resource information are all based on the Ethernet access point and the coaxial terminal where the Ethernet data transmission and reception device is located.
  • the attenuation loss between the two, and the attenuation loss between the coaxial terminal in which the Ethernet data transmission transceiver is located and other coaxial terminals in the coaxial distribution network are calculated.
  • the function modules in the device are configured with the transmission and reception parameters calculated according to the processing process of the configuration module, and thus can also The same effect as in the above two embodiments can be produced.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)

Abstract

La présente invention concerne un procédé et un système de configuration de transmission de données Ethernet et un dispositif émetteur-récepteur pour la transmission de données Ethernet dans un réseau de distribution coaxial. L'invention prend totalement en considération le déclin entre le point d'accès Ethernet et le terminal coaxial lors du calcul des paramètres de transmission et de réception de la couche physique. Ainsi, le déclin du signal de transmission Ethernet peut être compensé, afin d'assurer le passage de la couche physique entre le point d'accès Ethernet et le terminal coaxial. Puisque le déclin entre les terminaux coaxiaux ont aussi été pris en considération lors du calcul des paramètres de transmission et de réception de la couche physique, les paramètres de transmission et de réception calculés peuvent assurer la fermeture de la couche physique entre les terminaux coaxiaux.
PCT/CN2007/070576 2006-10-31 2007-08-28 Procédé de configuration, système et dispositif émetteur-récepteur pour transmission de données ethernet WO2008052452A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN200610142955.6 2006-10-31
CN2006101429556A CN101174976B (zh) 2006-10-31 2006-10-31 点对多点的同轴电缆以太网传输方法、系统及传输装置
CN200710002384.0 2007-01-15
CN2007100023840A CN101227294B (zh) 2007-01-15 2007-01-15 基于同轴电缆网上的以太网收发装置及以太网传输方法

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN107395434A (zh) * 2017-08-20 2017-11-24 长沙曙通信息科技有限公司 一种提升专用传输链路网络信号质量实现方法

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CN1121666A (zh) * 1995-03-13 1996-05-01 傲龙科技(深圳)有限公司 有线电视综合服务网
US20020131426A1 (en) * 2000-06-22 2002-09-19 Mati Amit Scalable virtual channel
JP2003152755A (ja) * 2001-11-16 2003-05-23 Ando Electric Co Ltd Ｌａｎ間接続システム

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CN1121666A (zh) * 1995-03-13 1996-05-01 傲龙科技(深圳)有限公司 有线电视综合服务网
US20020131426A1 (en) * 2000-06-22 2002-09-19 Mati Amit Scalable virtual channel
JP2003152755A (ja) * 2001-11-16 2003-05-23 Ando Electric Co Ltd Ｌａｎ間接続システム

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107395434A (zh) * 2017-08-20 2017-11-24 长沙曙通信息科技有限公司 一种提升专用传输链路网络信号质量实现方法

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