CN202737898U - Office end device suitable for coaxial wideband multi-service access - Google Patents
Office end device suitable for coaxial wideband multi-service access Download PDFInfo
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- CN202737898U CN202737898U CN 201220424695 CN201220424695U CN202737898U CN 202737898 U CN202737898 U CN 202737898U CN 201220424695 CN201220424695 CN 201220424695 CN 201220424695 U CN201220424695 U CN 201220424695U CN 202737898 U CN202737898 U CN 202737898U
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Abstract
The utility model discloses an office end device suitable for coaxial wideband multi-service access. The office end device suitable for coaxial wideband multi-service access comprises a SWITCH switch chip, a physical layer chip, an MAC layer chip, a network management module, a duplex filter, a coaxial data receiving port, a coaxial data transmission port and first, second and third RJ-45 interfaces. The physical layer chip is connected with the SWITCH switch chip through a standard GM II interface. The SWITCH switch chip is connected with the MAC layer chip through an RM II interface. The MAC layer chip is connected with the duplex filter. A high-frequency end of the duplex filter is connected with the coaxial data receiving port. A public end of the duplex filter is connected with the coaxial data transmission port. The network management module is connected with the SWITCH switch chip. With the cooperation of the device provided by the utility model with a home-entry user end device, point-to-multi-point broadband access with low cost and high performance can be realized by making full use of the existing cable television coaxial network.
Description
Technical field
The utility model relates to a kind of local side apparatus that is applicable to coaxial wide band multi-business access.This local side apparatus adopts the IEEE802.3ah agreement, by connecting the ONU of EPON system on the category-5 cable, mixes broadband access data service signal and cable television service signal, utilizes coaxial cable to send mixed signal.This equipment belongs to the broadband coaxial technical field of access networks.
Background technology
Entered since 21 century, the application of communication system has obtained the development of advancing by leaps and bounds, digital technology, network technology have obtained popularization and application, release along with broadband internet services such as IPTV, HDTV, VoIP, so that the user is day by day vigorous for the broadband access demand of the multimedia communications such as data, voice, image, the trend of " integration of three networks " is also more and more obvious.
Have data to show, the investment of subscribers feeder accounts for 40% ~ 50% of whole Access Network investment, if can utilize existing network to realize Broadband Network Access, so just can avoid laying the new communications network that involves great expense.Cable TV network (CATV) is as one of the widest network of coverage, have the characteristics such as bandwidth, aboundresources, optical fiber/coaxial hybrid network also is one of infrastructure of Future Information highway to CATV simultaneously, if can transform it, be used for realizing being connected between user and the telecommunication transport network, the broadband inserting service of economical and efficient will inevitably be provided for the user so.Like this when realizing that the cable TV network Two-way is transformed, for radio network of future generation (NGB) provides the profitable carrier-class broadband cable scheme of registering one's residence.
At present, the bidirectional rebuilding technology of comparative maturity mainly contains: CMTS+CM, passive EOC technology, active EOC technology.
(1) CMTS (Cable Modem Termination System)+CM (Cable Modem) is the cable modem technology.Wherein CMTS is core, adopts the DOCSIS agreement of International Telecommunications Union; User terminal CM is connected with Internet by CMTS, can realize the functions such as IP phone, video request program in cable TV network.This technical development is comparative maturity, and its major technique shortcoming is to have adopted the bus-network topological structure, and the user shares bandwidth and causes transfer of data unstable, adds the funneling effect of influx noise, and its application scale at home is limited.
(2) passive EOC technology.Passive EOC refers to a kind of Ethernet transmission technology based on coaxial cable that adopts passive device.It adopts the baseband coding mode, only will convert for the bipolar signal of Double-strand transmission the unipolar signal of being convenient to the coaxial cable transmission to.The passive EOC technology accesses bridge by placing at the corridor head end, the noise of user-isolated end, thus solved the most general also the most scabrous problem---the funnel noise that cable TV network exists.But passive EOC is only applicable to point-to-point topological structure, can not support the cable TV network that user distribution is relatively looser.
(3) active EOC technology.Main active modulation EOC technology has the technology such as HomePlug AV, MoCA, WiFi over Coax at present.HomePlug AV utilization 2MHz ~ 28 MHz frequency ranges, the carrier frequency of MOCA technology is used 800 MHz-1500 MHz frequency ranges, WiFi over Coax technology adopts 802.11b, with wireless high band 2.5GHz carrier wave, move the 750-950MHz frequency range of coax, the physical layer rate of 108Mbps can be provided.HomePlug AV and MOCA all adopt the OFDM modulation, and antijamming capability is strong, and HomePlug AV physical layer access rate can reach 200Mbps, and MOCA can reach 270Mbps.
Although these active modulation techniques can connect at a high speed the bidirectional terminal equipment in the family, need not again lay cables, yet the access of two-forty is to record when the desirable bag of 1518Byte is long.Mainly there is the problem of following two aspects in current active EOC modulation technique:
1. the total bandwidth of system access can access quantity increase and sharply decline with the user, and the access bandwidth that can provide is difficult to satisfy the requirement of NGB, and performance will obviously descend when the CSMA mechanism that above technology adopts accesses the quantity increase the user.
2. a lot of data services in the practical business such as real time business such as voice call and online games, are to lack packet form to occur.When the short bag of 64Byte frequently occurs, the throughput of system of above technology will sharply descend, and time delay, shake all have increase.
Current these technology all need to be placed at local side the local side apparatus CLT(Coax Line Terminal of a corresponding technology), realize carrying out modulation /demodulation to the reception of EPON ONU downlink network signal and to data-signal.The upper output port of existing local side apparatus CLT needs two kinds of interfaces, and a kind of is data-interface, and a kind of is radio frequency interface, is not suitable for adopting coaxial cable to transmit simultaneously the requirement of cable TV signal and the Internet signal.
The utility model content
The purpose of this utility model is to provide a kind of existing cable TV network that takes full advantage of, the convenient high-speed data access that realizes economically the cable TV subscriber is fit to use coaxial cable to transmit simultaneously the coaxial access local side apparatus of cable TV signal and baseband data signals.
For realizing above-mentioned utility model purpose, the utility model has adopted following technical scheme:
A kind of local side apparatus that is applicable to coaxial wide band multi-business access, it comprises the SWITCH exchange chip, physical chip, MAC layer chip, network management module, duplexer filter, the coaxial data receiving port, coaxial data transmit port and first～the 3rd RJ-45 interface, described physical chip is connected with the SWITCH exchange chip by the standard gmii interface, described SWITCH exchange chip is connected with MAC layer chip by the RMII interface, described MAC layer chip connects and is connected with duplexer filter, described duplexer filter front end is connected with the coaxial data receiving port, described duplexer filter common port is connected with the coaxial data transmit port, described network management module is connected with the SWITCH exchange chip, described first, two RJ-45 interfaces are connected with physical chip, and the 3rd RJ-45 interface is connected with MAC layer chip.
Preferably, be applicable to cable TV signal and data-signal frequency division multiplexing in the local side apparatus of coaxial wide band multi-business access at this, wherein the data-signal frequency band takies 5～65MHz, and the cable TV signal frequency band takies 65～860MHz.
Particularly preferred, described network management module is to adopt the IEEE802.3ah media access control protocol, and the network management module of upward signal and downstream signal employing TDD time division duplex.
Preferably, described physical layer of device is the physical layer of device that adopts many level vestigial side bands of n-VSB modulation system.
Preferably, described first and second RJ-45 interface is the gigabit network interface.
Preferably, described the 3rd RJ-45 interface is the LCI interface.
Preferably, described local side apparatus also comprises for the power supply that is connected with power supply supplies with interface, described power supply is supplied with interface and is produced 1.8V or 3.3V direct current, for all chips of equipment comprise: SWITCH exchange chip, physical chip, MAC layer chip and network management module power supply.
In the said equipment, described SWITCH exchange chip is responsible for exchanges data, and the data of each logic port are transmitted and broadcasted, and realizes dividing VLAN and leading subscriber end device mac address function, and data communication device is crossed the RMII interface and sent to MAC layer chip; The SWITCH exchange chip is controlled by network management module, receives the Ethernet data that issues from physical chip, carries out the signal conversion by MAC layer chip after exchange, sends to downlink broadcast.
Described physical chip is used for receiving from the next broadband ethernet data that meet IEEE 802.3ah media access protocol of first line of a couplet kilomega network oral instructions, transfers data to the SWITCH exchange chip by the standard gmii interface.
Described MAC layer chip changed between the analog signal of realization RMII digital signal and suitable transmission over coaxial cable, and will be transferred to duplexer filter after the analog signal transformation for the treatment of the broadband ethernet data that transmit from the SWITCH exchange chip.
Described network management module adopts the IEEE802.3ah media access control protocol, has to read and rewrite the function that SWITCH exchange chip configuration file is carried out management; And by with the communicating by letter of ustomer premises access equipment, realize the timing synchronization with user side, and the function such as distributing user end bandwidth.
Described coaxial data receiving port is responsible for connecting cable TV network and duplexer filter front end, receives the data from cable TV network; Described coaxial data transmit port connects the duplexer filter common port, is responsible for sending the mixed signal of cable TV signal and broadband ethernet signal to ustomer premises access equipment; And the coaxial data transmit port, expansion downwards connects maximum 64 ustomer premises access equipments, can realize a plurality of user sides are carried out the up Dynamic Bandwidth Allocation of Priority-based, can ensure fair stable bandwidth when user side priority is identical.
Wherein first and second RJ-45 interface is the gigabit network interface, is used for to physical chip transmission broadband Ethernet data; The 3rd RJ-45 interface is the LCI interface, is used for MAC layer chip communication, implements the webmastering software management to the SWITCH exchange chip.
Compared with prior art, the beneficial effects of the utility model are: cooperate the coaxial network ustomer premises access equipment of registering one's residence, can take full advantage of existing cable TV coaxial net, realize low-cost and the point-to-multipoint access in high performance broadband.
Description of drawings
Fig. 1 is the internal circuit configuration figure that is applicable to the local side apparatus of coaxial wide band multi-business access in the utility model one preferred embodiment;
Fig. 2 is the flow chart of the exchanges data of SWITCH exchange chip and other chips among Fig. 1 embodiment;
Fig. 3 is the flow chart that MAC layer Data within the chip processed among Fig. 1 embodiment.
Embodiment
Consult Fig. 1, this local side apparatus that is applicable to coaxial wide band multi-business access comprises the SWITCH exchange chip, physical chip, MAC layer chip, network management module, duplexer filter, the coaxial data receiving port, the coaxial data transmit port, the RJ-45-1 interface, the RJ-45-2 interface, RJ-45-3 interface and power supply are supplied with interface, physical chip is connected with the SWITCH exchange chip by the standard gmii interface, the SWITCH exchange chip is connected with MAC layer chip by the RMII interface, MAC layer chip connects and is connected with duplexer filter, the duplexer filter front end is connected with the coaxial data receiving port, the duplexer filter common port is connected with the coaxial data transmit port, network management module is connected with the SWITCH exchange chip, the RJ-45-1 interface, the RJ-45-2 interface is connected with physical chip, RJ-45-3 interface and MAC layer chip connect, power supply is supplied with interface and is produced the 3.3V direct current, is the SWITCH exchange chip, physical chip, MAC layer chip and network management module power supply.Wherein power supply supply interface is connected with the 12V DC power supply, and RJ-45-1 interface and RJ-45-2 interface are the gigabit network interface, and the RJ-45-3 interface is the LCI interface.
Input present embodiment RJ-45-1 interface and RJ-45-2 interface and transfer to physical chip via category-5 cable from the broadband of the descending transmission of ONU ether data; Physical chip is sent to the SWITCH exchange chip by the GMII physical interface after receiving the broadband ethernet data, under the control of network management module, broadband ether data after the SWITCH exchange chip will exchange output to MAC layer chip by the RMII interface, by MAC layer chip Ethernet data is encoded and a series of processing such as encryption after, digital signal is converted to coaxial analog signal sends duplexer filter to; Duplexer filter receives cable TV signal by the coaxial data receiving port, mix cable TV signal and broadband ethernet signal after, with mixed signal by the coaxial data transmit port to the descending ustomer premises access equipment that is broadcast to.
Consult Fig. 2, the exchanges data flow process of present embodiment SWITCH exchange chip and other chips enters lower:
⑴ the reception and transmission of broadband ethernet data: this local side apparatus links to each other with cable TV network with ustomer premises access equipment with the coaxial data transmit port by the coaxial data receiving port; From the Ethernet request msg of user side by the up transmission of coaxial cable, pass to duplexer filter by the coaxial data receiving port, after digital-to-analogue conversion, arrive the MAC receiver module of MAC layer chip, and respective data transfer is arrived the SWITCH exchange chip; Network management module to from the Ethernet data of different user end equipment according to the classification of the SLA grade of service, control SWITCH exchange chip carries out the exchanges data between logic port; The SWITCH exchange chip sends data to physical chip, and physical chip is finished the reception of ether data, and sends to up ONU by category-5 cable via RJ-45-1 interface and RJ-45-2 interface.The present embodiment data are transmitted in both directions, and are in like manner descending.
⑵ the send and receive of network management module control signal: network management module adopts the IEEE802.3ah media access control protocol to realize the point-to-multipoint broadband access, by with the communicating by letter of ustomer premises access equipment, realize that the registration of user side reaches the standard grade, and the function such as response user side dynamic bandwidth request; Upward signal and downstream signal transmit frequency division multiplexing, uplink and downlink communication adopts the TDD time division duplex, can realize a plurality of user sides are carried out the up Dynamic Bandwidth Allocation of Priority-based, when user side priority is identical, can ensure fair stable bandwidth, realize stablizing the wideband data access that QoS ensures.
Referring to Fig. 3, present embodiment MAC layer Data within the chip handling process is as follows:
Down direction, Ethernet wideband data from the transmission of SWITCH exchange chip, at first enter the MAC module of MAC layer chip internal, through the FEC forward error correction coding, the signal modulation of modulation module, then modulation data information is converted to the analog signal that is fit to coaxial transmission, by the outer garbage of the band in the low pass filter filters out signal and noise, amplifies by amplifier at last and pass the signal to duplexer filter.
Up direction, the analog signal that sends from coaxial cable receives and amplification through low noise amplifier, by low-pass filtering module filtering out of band signal and noise, then reduce the amplitude of mould preparation analog signal in the amplitude modulation module controls, through after the digital-to-analogue conversion, digital signal is carried out automatic gain control, and carry out channel demodulation by equalizer and become baseband signal.After the decoding of the process of the signal after demodulation forward error correction decoder, output to the MAC module of MAC layer chip internal.
Below only be concrete exemplary applications of the present utility model, protection range of the present utility model is not constituted any limitation.All employing equivalents or equivalence are replaced and the technical scheme of formation, all drop within the utility model rights protection scope.
Claims (7)
1. one kind is applicable to the local side apparatus that coaxial wide band multi-business accesses, it comprises the SWITCH exchange chip, physical chip, MAC layer chip, network management module, duplexer filter, the coaxial data receiving port, coaxial data transmit port and first～the 3rd RJ-45 interface, described MAC layer chip is connected with duplexer filter, described duplexer filter front end is connected with the coaxial data receiving port, described duplexer filter common port is connected with the coaxial data transmit port, described first, two RJ-45 interfaces are connected with physical chip, the 3rd RJ-45 interface and MAC layer chip connect, it is characterized in that, described physical chip is connected with the SWITCH exchange chip by the standard gmii interface, described SWITCH exchange chip is connected with MAC layer chip by the RMII interface, and described network management module is connected with the SWITCH exchange chip.
2. the local side apparatus that is applicable to the access of coaxial wide band multi-business according to claim 1, it is characterized in that, described network management module is to adopt the IEEE802.3ah media access control protocol, and the network management module of upward signal and downstream signal employing TDD time division duplex.
3. the local side apparatus that is applicable to the access of coaxial wide band multi-business according to claim 1, it is characterized in that, be applicable to cable TV signal and data-signal frequency division multiplexing in the local side apparatus of coaxial wide band multi-business access at this, wherein the data-signal frequency band takies 5～65MHz, and the cable TV signal frequency band takies 65～860MHz.
4. the local side apparatus that is applicable to coaxial wide band multi-business access according to claim 1 is characterized in that, described physical layer of device is the physical layer of device that adopts many level vestigial side bands of n-VSB modulation system.
5. the local side apparatus that is applicable to coaxial wide band multi-business access according to claim 1 is characterized in that described first and second RJ-45 interface is the gigabit network interface.
6. the local side apparatus that is applicable to coaxial wide band multi-business access according to claim 1 is characterized in that described the 3rd RJ-45 interface is the LCI interface.
7. each described local side apparatus that is applicable to coaxial wide band multi-business access according to claim 1-6, it is characterized in that, it also comprises for the power supply that is connected with power supply supplies with interface, described power supply is supplied with interface and is produced 1.8V or 3.3V direct current, for all chips of equipment comprise: SWITCH exchange chip, physical chip, MAC layer chip and network management module power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220424695 CN202737898U (en) | 2012-08-24 | 2012-08-24 | Office end device suitable for coaxial wideband multi-service access |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220424695 CN202737898U (en) | 2012-08-24 | 2012-08-24 | Office end device suitable for coaxial wideband multi-service access |
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| Publication Number | Publication Date |
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| CN202737898U true CN202737898U (en) | 2013-02-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220424695 Expired - Fee Related CN202737898U (en) | 2012-08-24 | 2012-08-24 | Office end device suitable for coaxial wideband multi-service access |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103117908A (en) * | 2012-08-24 | 2013-05-22 | 苏州云普通讯技术有限公司 | Office-end device suitable for coaxial broadband service multi-business access |
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- 2012-08-24 CN CN 201220424695 patent/CN202737898U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103117908A (en) * | 2012-08-24 | 2013-05-22 | 苏州云普通讯技术有限公司 | Office-end device suitable for coaxial broadband service multi-business access |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130213 Termination date: 20160824 |