CN202737864U - Relay device suitable for point-to-multipoint broadband coaxial access - Google Patents
Relay device suitable for point-to-multipoint broadband coaxial access Download PDFInfo
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- CN202737864U CN202737864U CN 201220424716 CN201220424716U CN202737864U CN 202737864 U CN202737864 U CN 202737864U CN 201220424716 CN201220424716 CN 201220424716 CN 201220424716 U CN201220424716 U CN 201220424716U CN 202737864 U CN202737864 U CN 202737864U
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Abstract
The utility model discloses a relay device suitable for point-to-multipoint broadband coaxial access. The relay device suitable for point-to-multipoint broadband coaxial access comprises a CPLD module, a front-end physical layer chip, a back-end physical layer chip, a front-end network transformer, a back-end network transformer, a front-end duplex filter, a back-end duplex filter, a front-end coaxial data transceiver port, a back-end coaxial data transceiver port, a coaxial television transmission port, a coaxial television receiving port and a power supply interface. With the cooperation of the device provided by the utility model with an office end device and a home-entry user end device, point-to-multipoint broadband access with low cost and high performance can be realized in some residential areas where background noise is serious and the attenuation from an optical node to a building is large by making full use of the existing cable television coaxial network.
Description
Technical field
The utility model relates to a kind of trunking that is applicable to point-to-multipoint broadband coaxial access, is applicable to receive and send the mixed signal that is comprised of broad band low frequency data-signal and high frequency cable TV 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 HomePlug AV, MoCA, the technology such as WiFi over Coax, ECAN 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; 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 occur with short packet form.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.
ECAN(Ethernet Coax Access Network) technology adopts the IEEE802.3ah media access control protocol, uplink and downlink signals transmits and is operated in identical frequency band, uplink and downlink communication adopts the TDD time division duplex, adopt the broadband access of the method realization user data of many level vestigial side band modulation, effectively solved above-mentioned two problems.
But it is more serious to make an uproar at some ends, the optical node larger residential quarter of decaying to the building, and the ECAN system fails to show good performance.For this reason, need a kind of coaxial Access Network trunking, realize the broadband ether access signal relaying enlarging function on the coaxial cable.
The utility model content
The utility model provides a kind of trunking that is applicable to point-to-multipoint broadband coaxial access, can take full advantage of existing cable TV network, convenient cable TV subscriber's the high-speed wideband data access of realizing economically.
For realizing above-mentioned utility model purpose, the utility model has adopted following technical scheme:
A kind of trunking that is applicable to point-to-multipoint broadband coaxial access, it comprises the CPLD module, the front end physical chip, back-end physical layer chip, the front network transformer, the back-end network transformer, the front end duplexer filter, the rear end duplexer filter, front end coaxial data transmitting-receiving port, rear end coaxial data transmitting-receiving port, coaxial TV receiving port and coaxial TV transmit port, described CPLD module is connected with back-end physical layer chip with the front end physical chip respectively by the MII interface, described front end physical chip is connected with the front end duplexer filter through the front network transformer, described front end duplexer filter front end is connected with coaxial TV transmit port, and described front end duplexer filter common port is connected with front end coaxial data transmitting-receiving port; Described back-end physical layer chip is connected with the rear end duplexer filter through the back-end network transformer, and described rear end duplexer filter front end is connected with coaxial TV receiving port, and described rear end duplexer filter common port is connected with rear end coaxial data transmitting-receiving port.
Particularly preferred, described trunking supports multi-stage cascade to use, and described coaxial data transmit port can be expanded connection plurality of users end equipment CNU.
Preferably, described trunking also comprises for the power supply that is connected with power supply supplies with interface, and described power supply is supplied with interface and is connected with CPLD module, front end physical chip and back-end physical layer chip respectively.
Described trunking upward signal and downstream signal transmission are operated in identical frequency band, and upward signal is communicated by letter with downstream signal and adopted the TDD time division duplex.
Described trunking cable TV signal and data-signal frequency division multiplexing, wherein the data-signal frequency band is 5～65MHz, the cable TV signal frequency band is 65～860MHz.
The wrong bag of the built-in data of described CPLD module ordo judiciorum.
Described trunking physical layer data signal adopts many level vestigial side bands of n-VSB modulation system.
In the said equipment, the CPLD module is responsible for the ether data that upstream or downstream receive are carried out corresponding decision process and forwarding, and forwarding data sends to front end physical chip and back-end physical layer chip by the MII interface.
The front end physical chip receives the Difference signal pair that transmits from the front end network transformer, transfers to the CPLD module by the MII interface after being converted to physical layer signal; Back-end physical layer chip receives the Difference signal pair that transmits from the back-end network transformer, transfers to the CPLD module by the MII interface after being converted to physical layer signal.
Front network transformer (or back-end network transformer) will transfer to front end duplexer filter (or rear end duplexer filter) after the Difference signal pair transformation.
The front end duplexer filter separates by low frequency ether data-signal reception with the mixed signal that the high frequency cable TV signal forms, and by built-in low frequency port the ether data-signal is transferred to the front network transformer, the high frequency port with Cable TV Signal Transmission to coaxial TV transmit port; The rear end duplexer filter is used for the low frequency ether data-signal after the relay process is mixed again with the high frequency cable TV signal.
Front end coaxial data transmitting-receiving port is used for receiving the mixed signal from low frequency ether data-signal and the high frequency cable TV signal of local side apparatus downlink broadcast; Rear end coaxial data transmitting-receiving port is used for sending the mixed signal after relaying amplifies.
Compared with prior art, the beneficial effects of the utility model are: utilize the equipment in the utility model, the ustomer premises access equipment that cooperates local side apparatus and register one's residence, can make an uproar more serious at some ends, the optical node larger residential quarter of decaying to the building takes full advantage of existing cable TV coaxial net, realizes low-cost and high performance point-to-multipoint broadband access.
Description of drawings
Fig. 1 is the trunking internal circuit configuration figure that is applicable to coaxial broadband access in the utility model one preferred embodiment;
Fig. 2 is the flow chart that CPLD inside modules data are processed among Fig. 1 embodiment;
Fig. 3 is the network topological diagram that Fig. 1 embodiment is used for the broadband coaxial connecting system.
Embodiment
Consult Fig. 1, this trunking that is applicable to coaxial Ethernet access comprises CPLD module, front end physical chip, back-end physical layer chip, front network transformer, back-end network transformer, the front end duplexer filter, the rear end duplexer filter, front end coaxial data transmitting-receiving port, rear end coaxial data transmitting-receiving port, coaxial TV receiving port, coaxial TV transmit port and power supply are supplied with interface; The CPLD module is connected with back-end physical layer chip with the front end physical chip respectively by the MII interface, the front end physical chip is connected with the front end duplexer filter through the front network transformer, front end duplexer filter front end is connected with coaxial TV transmit port, and front end duplexer filter common port is connected with front end coaxial data transmitting-receiving port; Back-end physical layer chip is connected with the rear end duplexer filter through the back-end network transformer, and rear end duplexer filter front end is connected with coaxial TV receiving port, and rear end duplexer filter common port is connected with rear end coaxial data transmitting-receiving port; Power supply supply interface divides with CPLD module, front end physical chip and back-end physical layer chip and is connected.
The present embodiment is in the data downstream direction, the mixed signal that is comprised of low frequency ether data-signal and high frequency cable TV signal issues from local side apparatus broadcasting, after receiving, front end coaxial data transmitting-receiving port transfers to the front end duplexer filter, isolate the ether data-signal and deliver to the front network transformer through the low frequency delivery outlet, the front network transformer is Difference signal pair with the ether data shift signal, transfer to the front end physical chip, the front end physical chip is through matched filtering, balanced, after n-VSB separates mediation RS data decode, data communication device is crossed the MII interface transfer to the CPLD module, undertaken after logic is judged correct data being transmitted by CPLD, export back-end physical layer chip to, back-end physical layer chip is through the RS data encoding, the n-VSB modulation, frequency conversion and filtering interpolation, data are converted to Difference signal pair are sent to the back-end network transformer, and the common port of input rear end duplexer filter, the rear end duplexer filter is sent to ustomer premises access equipment with the mixed signal of low frequency ether data-signal and high frequency cable TV signal by rear end coaxial data transmitting-receiving port; The high frequency cable TV signal is exported by coaxial TV transmit port after the front end duplexer filter separates, by corresponding Wired television signal amplifier TV signal is amplified, input this trunking to recover mixed signal through the coaxial TV receiving port of rear end duplexer filter again.
Data are transmitted in both directions in the present embodiment trunking, and are in like manner up.
Consult Fig. 2, the flow process that CPLD inside modules data are processed in the present embodiment is as follows:
Down direction is transferred to the ether data of CPLD module by the front end physical chip, receive by the MAC_RX receiver module in the CPLD module, enters the asynchronous FIFO stack of AFIFO; After one period by the system clock calibration, send into the Buffer buffer area and carry out buffer memory; CPLD module logic built will judge whether data make mistakes in the buffer area, and the data packet discarding that will make mistakes; Through after one period by the system clock calibration, correct packet enters asynchronous FIFO stack by buffer area, sends by the MAC_TX sending module, and transfers to back-end physical layer chip again.
Data are transmitted in both directions in the present embodiment trunking, and are in like manner up.
Consult Fig. 3, the trunking of the present embodiment is applied to broadband coaxial data insertion system network:
The EPON system delivers to residential quarter or limit, building with signal, realizes user's access by the coaxial net of registering one's residence.The ONU of EPON delivers to the ether data that receive the local side apparatus CLT(Coax Line Terminal of broadband coaxial data insertion system).This ether data-signal with issued by local side apparatus broadcasting after broadcast television signal from cable television network mixes, through the present embodiment that uses separately or multi-stage cascade uses carries out the relaying amplification to the ether data-signal after, by the ustomer premises access equipment CNU(Coax Network Unit in the coaxial net of registering one's residence) receive.Be applicable to the coaxial Access Network that the trunking of point-to-multipoint broadband coaxial access, coaxial register one's residence net and ustomer premises access equipment consist of by local side apparatus, the present embodiment and finish the wide band multi-business access.
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 (3)
1. one kind is applicable to the trunking that point-to-multipoint broadband coaxial accesses, it comprises the CPLD module, the front end physical chip, back-end physical layer chip, the front network transformer, the back-end network transformer, the front end duplexer filter, the rear end duplexer filter, front end coaxial data transmitting-receiving port, rear end coaxial data transmitting-receiving port, coaxial TV receiving port and coaxial TV transmit port, described front end duplexer filter front end is connected with coaxial TV transmit port, described front end duplexer filter common port is connected with front end coaxial data transmitting-receiving port, described rear end duplexer filter front end is connected with coaxial TV receiving port, and described rear end duplexer filter common port is connected with rear end coaxial data transmitting-receiving port; It is characterized in that, described CPLD module is connected with back-end physical layer chip with the front end physical chip respectively by the MII interface, described front end physical chip is connected with the front end duplexer filter through the front network transformer, and described back-end physical layer chip is connected with the rear end duplexer filter through the back-end network transformer.
2. the trunking that is applicable to point-to-multipoint broadband coaxial access according to claim 1 is characterized in that, described trunking supports multi-stage cascade to use, and described coaxial data transmit port can be expanded connection plurality of users end equipment CNU.
3. the trunking that is applicable to the access of point-to-multipoint broadband coaxial according to claim 1, it is characterized in that, it also comprises for the power supply that is connected with power supply supplies with interface, and described power supply is supplied with interface and is connected with CPLD module, front end physical chip and back-end physical layer chip respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220424716 CN202737864U (en) | 2012-08-24 | 2012-08-24 | Relay device suitable for point-to-multipoint broadband coaxial access |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220424716 CN202737864U (en) | 2012-08-24 | 2012-08-24 | Relay device suitable for point-to-multipoint broadband coaxial access |
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| Publication Number | Publication Date |
|---|---|
| CN202737864U true CN202737864U (en) | 2013-02-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220424716 Expired - Fee Related CN202737864U (en) | 2012-08-24 | 2012-08-24 | Relay device suitable for point-to-multipoint broadband coaxial access |
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| CN (1) | CN202737864U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104469534A (en) * | 2014-10-30 | 2015-03-25 | 成都康特电子高新科技有限责任公司 | EOC terminal based on broadcast television network system |
| CN105846986A (en) * | 2016-05-22 | 2016-08-10 | 上海大学 | Coaxial line signal frequency shift transmission method |
-
2012
- 2012-08-24 CN CN 201220424716 patent/CN202737864U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104469534A (en) * | 2014-10-30 | 2015-03-25 | 成都康特电子高新科技有限责任公司 | EOC terminal based on broadcast television network system |
| CN105846986A (en) * | 2016-05-22 | 2016-08-10 | 上海大学 | Coaxial line signal frequency shift transmission method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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 |