CN1799223A - Broadband access system and access method implemented on cable TV network - Google Patents

Broadband access system and access method implemented on cable TV network Download PDF

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Publication number
CN1799223A
CN1799223A CN200480015000.3A CN200480015000A CN1799223A CN 1799223 A CN1799223 A CN 1799223A CN 200480015000 A CN200480015000 A CN 200480015000A CN 1799223 A CN1799223 A CN 1799223A
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data
signal
blender
sent
duplexing
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CN100345421C (en
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杨岳峰
方国元
王景兆
陈崇军
周好
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/2801—Broadband local area networks

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Small-Scale Networks (AREA)
  • Optical Communication System (AREA)

Abstract

The invention provides a broadband access system and access method implemented on cable TV network, comprising a synthesis light gathering station, a duplex mixer, a branching device, a network side of the HFC coaxial distribution, a terminal accessing device connected with the HFC light network side of the cable TV network, IP area network. Also provided is a broadband accessing method, comprising: synthesis light gathering station receiving the CATV light signal, a data signal and converting into the CATV radio frequency signal and the data radio frequency signal, transmitting to the duplex mixer for a multiplexing and transmitting to the branching device through the HFC coaxial distribution network side, demultiplexing to a source signal and transmitting to the TV and terminal receiver respectively; and the duplex mixer receiving the upstream signal from the HFC coaxial distribution network side and demultiplexing to the data radio frequency signal and transmitting to the IP area network through the synthesis light gathering station. The invention can access the broadband based on the CATV network in a lower cost.

Description

Broadband access system and access method implemented on cable TV network
A kind of system and its cut-in method technical field for realizing broadband access on the net in cable television
The present invention relates to Broadband Network Access technical field, a kind of system and its cut-in method for realizing broadband access on the net in cable television is referred specifically to.Background of invention
The system referred to as cable television of multiway images, sound radio and data-signal is provided the user with wired mode in certain area（CATV) system.After middle nineteen nineties, with social progress, the development of technology, CATV systems are developed rapidly towards the direction of large-scale, multifunction, multi-service.Due to the development of new technology, optical fiber technology, transmitted in both directions technology in such as optical transport technology, Hybrid Fiber and Coax Network HFC（HFC) the development of technology so that in addition to the broadcast TV program transmission basic except realizing of CATV systems, various new business such as VOD, multimedia service, broadband access based on CATV Wang Network etc. can also be realized.
The especially development of optical transport technology, overcome a series of defects that CATV systems used coaxial cable transmission means originally, advance change of the CATV networks from former coax network to the coaxial hybrid network of light country fair, it is believed that be the once great leap of CATV systems technologies development.Meanwhile, broadband network and broadband services are developed rapidly, and because CATV systems have covered all subscriber households substantially, therefore, it is proposed to pass through the scheme of CATV real-time performance broadband access.
For pure catv network, the HFC used includes HFC optical-fiber networks side and HFC Coaxial distribution network networks side, because TV signal is downlinked to each user by catv network by the way of broadcast, therefore the optical-fiber network side of HFC networks is the network of one-way transmission.
In order to realize the broadband access based on CATV Wang Network, it is necessary to by the light net of hfc plant Network side is changed to bilateral network, to realize the uplink of data.As Fig. 1 shows the broadband access system realized based on catv network.
This broadband access system mainly includes：Ethernet switch 102 (LAN Switch), (CMTS of cable modem local side apparatus 103, Cable Modem Termination System), upconverter 105, blender 106, HFC optical-fiber networks side 107 and HFC Coaxial distribution network networks side 108 hfc plant, splitter 109 and the cable modem 110 (CM, Cable Modem) that constitute etc..
For downlink data, the data-signal of IP Metropolitan Area Network (MAN)s is sent to after CMTS 103 by Ethernet switch 102, downstream signal is transformed to a CATV channel by upconverter 105 by CMTS 103, the downstream signal is multiplexed into CATV signals by blender 106, HFC Coaxial distribution network network side 108 is sent to by HFC optical-fiber networks side 107, then isolated by splitter 109 after the downstream signal, IP data-signals are restored by CM 110.For upstream data, user is converted to radiofrequency signal by CM 110, Coaxial distribution network network side 108 is sent to by splitter 109, CMTS 103 is being sent to by improved HFC optical-fiber networks side 107, being then converted to IP data by Ethernet switch 102 by CMTS 103 is sent to IP Metropolitan Area Network (MAN)s.
It is using the major defect of this broadband access system：Need to be modified original HFC optical-fiber networks side, because pure CATV networks are descending one-way transmissions, therefore the uplink of data is realized, need to be changed to the optical-fiber network of transmitted in both directions to support uplink and downlink signals by the HFC optical-fiber networks of former CATV one-way transmission, it is more to network change, such as include optical receiving device increase passback optical sender.Using this scheme, newly added equipment is not only wanted, it is often more important that, transformation HFC optical-fiber networks will consider the influence to former catv network, so that the complexity that network rebuilding process becomes, causes cost higher.
On the other hand, access device is placed at optical node, typically from the point of view of network structure, and the access device being placed at an optical node should be designed to the ability at least with 500 users of covering, Corresponding administration overhead, bandwidth cost cost are configured with the ability more than 500 users, and cost is also higher.
In addition, from the point of view of input cost ratio and income ratio, need above-mentioned cost input, and use the user of CATV networks progress broadband access less, then input cost ratio is far longer than income ratio, especially in network primary construction, due to user very little, the cycle of cost-recovering to profit is longer, and market income is poor.The content of the invention
Present invention aims at provide it is a kind of cable television it is online it is real ' existing broadband access system and its cut-in method, make that the broadband access based on CATV networks can be realized with relatively low cost.
The invention provides the system for realizing broadband access on the net in cable television, the cable television network includes HFC optical-fiber networks side（107) with the coaxial Fen Pei Wang Network sides of HFC（108), the system includes：Comprehensive converged light station（201), duplexing blender（202), splitter（109), terminal access device（203), wherein,
Comprehensive converged light station（201) respectively with HFC optical-fiber networks side（107), IP Metropolitan Area Network (MAN)s, duplexing blender（202) it is connected, for HFC optical-fiber networks side will to be come from（107) CATV optical signals, the data-signal from IP Metropolitan Area Network (MAN)s are respectively converted into CATV radiofrequency signals and data radiofrequency signal is sent to duplexing blender（, and will be from duplexing blender 202)（202) data radio signal is converted to data-signal and is sent to IP Metropolitan Area Network (MAN)s；
Duplexing blender（202) HFC Coaxial distribution network networks side, is passed through（And splitter 108)（109) it is connected, for comprehensive converged light station will to be come from（201) after CATV radiofrequency signals and data radiofrequency signal is multiplexed, it is sent to splitter（109), and by splitter（109) the demultiplexed data radio signal of signal uploaded is sent to comprehensive converged light station (201)； Splitter（109) with terminal access device（203) it is connected, for duplexing blender will to be come from（202) the demultiplexed data radio signal of signal sends terminal access device to（, and self terminal access device in future 203)（203) data radio signal multiplexing is sent to duplexing blender into upward signal（202) ；
Terminal access device（203) it is used for the conversion for realizing data radio signal and data-signal.Wherein, described synthesis converged light station（201) include：Photoreceiver（2011), radio frequency amplifier（2012), Ethernet switch（And data insertion equipment 2013)（ 2014 )；Photoreceiver（And radio frequency amplifier 2011)（2012), it is connected with outside HFC optical-fiber networks side (107), for by the CATV optical signals of reception, being converted to CATV radiofrequency signals and being sent to radio frequency amplifier；Radio frequency amplifier（2012) it is used to the CATV radiofrequency signals of reception being amplified, and exports to outside duplexing blender（202) ；Ethernet switch (2013) and data insertion equipment（2014), it is connected with the IP Metropolitan Area Network (MAN)s, for realizing data-signal in data insertion equipment（2014) forwarding between IP Metropolitan Area Network (MAN)s；Data insertion equipment（2014) also with outside duplexing blender（202) it is connected, the conversion for realizing data-signal and data radio signal.
Wherein, described data insertion equipment（2014) include：Radio frequency interface unit, Transmit Receive Unit, base band and MAC processing units, main CPU unit, Ethernet Transmit-Receive Unit and Ethernet interface unit, the unit are sequentially connected；Transmit Receive Unit realizes the reception and transmission of data radio signal with radio frequency interface unit jointly；Base band and MAC processing units are used to realize the processing to the physical layer and MAC layer of data radiofrequency signal；Main CPU unit is used to realize data-signal and the conversion of data radio signal format, and the control to base band and MAC processing units；Ethernet Transmit-Receive Unit realizes the reception and transmission of data-signal with Ethernet interface unit jointly.Present invention also offers a kind of method for realizing broadband access on the net in cable television, this has Line television network includes HFC optical-fiber networks side（107) with HFC Coaxial distribution network networks side（108), broadband access system includes comprehensive converged light station（201), duplexing blender（202), splitter（109), terminal access device（203), the broad band access method includes downlink transfer and the uplink of data, wherein,
The downlink transfer of data includes step：
Comprehensive converged light station（201) data-signal from IP Metropolitan Area Network (MAN)s is received, data radio signal is converted to and is sent to Chinese work blender（202) ；
Duplexing blender（202) by the data radio signal multiplexing of reception into descending radiofrequency signal, HFC Coaxial distribution network networks side is passed through（108) splitter is sent to（ 109) ；Splitter（109) the demultiplexed data radio signal of the radiofrequency signal of reception is sent to terminal access device（203 ) ；
Terminal access device（203) data radio signal is converted into data-signal and is sent to user data terminal device；
The uplink of data includes step：
Terminal access device（203) data-signal from user data terminal device is converted into data radio signal and is sent to splitter（ 109) ；
Splitter（109) by the data radio signal multiplexing of reception into up radiofrequency signal, the coaxial Fen Pei Wang Network sides of HFC are passed through（108) it is sent to duplexing blender（202) ；
Duplexing blender（202) the demultiplexed data radio signal of the radiofrequency signal of reception is sent to comprehensive converged light station（201) ；
Comprehensive converged light station（201) will be from duplexing blender（202) data radio signal is converted to data-signal and is sent to IP Metropolitan Area Network (MAN)s.
Wherein, described data radio signal is the radiofrequency signal more than 860MHz.
Wherein, described data-signal is lan protocol signal, and described data radio signal is WLAN protocol signal. Wherein, described lan protocol includes IEEE802.3 agreements；Described WLAN protocol includes the lg agreements of IEEE802.1 la, IEEE802.11b or IEEE 802.1.
Wherein, it is described to be multiplexed with frequency division multiplexing or time division multiplexing.After above-mentioned technical scheme, the invention has the advantages that：
1, the broadband access system that the present invention is provided effectively utilizes the coaxial cable resource of the HFC Coaxial distribution network networks side of existing catv network, the line that broadband access and cable television service are realized on catv network is registered one's residence.Access device is directly connected by the present invention with the HFC Coaxial distribution network networks side of CATV systems, and HFC optical-fiber networks side is not changed, and original CATV network can be used completely, new equipment is only superimposed on legacy network.For prior art, due to being not required to transformation HFC Guang Wang Network sides, the cost of input at initial stage is reduced.And broadband access is realized as a result of the mode for being overlapped new equipment in former CATV networks, the influence to former catv network is smaller.
2, from the point of view of network structure, because data insertion equipment of the present invention is placed in Coaxial distribution network network side, it is placed in the customer volume that the equipment of the side gusset covered less, access device about has the ability of 200 users of covering, for this is when current user is less, uses enough, and because covering user capability is smaller, corresponding administration overhead cost, bandwidth cost cost also can be relatively small.
3, from the point of view of input cost ratio and income ratio, cost input is relatively low, it is assumed that 200 user costs of input than design, if 100 users access, input ratio and income ratio about 200:100, can blunt fast cost-recovering and income.
4, the present invention additionally uses the data that high band transmits broadband access, away from noise frequency, so as to improve the antijamming capability of data transfer, reduces data transmission error rate.Also, due to further having used WLAN protocol, data transfer is provided with the preferably anti-severe performance that WLAN protocol has. Brief Description Of Drawings
Fig. 1 is the existing broadband access system structure chart based on catv network；
Fig. 2 is the broadband access system structure chart of the invention based on catv network；Fig. 3 is data insertion equipment structure chart of the present invention；
Fig. 4 is the flow chart that data downstream is transmitted；
Fig. 5 is the flow chart of data upstream transmission.Implement the mode of the present invention
The invention provides a kind of scheme by CATV real-time performance broadband access, Ethernet switch and data insertion equipment are moved down into HFC Coaxial distribution network networks side, Ethernet switch and data insertion equipment is set no longer to be directly connected to HFC Coaxial distribution network networks side by HFC optical-fiber networks sidepiece, it can so avoid carrying out HFC optical-fiber networks side the transformation of transmitted in both directions, it is to avoid the transformation to the photoreceiver of former CATV networks.Also, the coaxial cable resource realization for also utilizing HFC Coaxial distribution network networks side is linked into user, and without separately removing the circuit of this part of erection accessing user.
Ethernet switch and data insertion equipment are directly configured in cell light-receiving pusher side, although can not cover large-capacity user, still, and this is just meeting at present by the less situation of CATV wide band access users.Accordingly, administration overhead, bandwidth cost cost are also small, understand cost-recovering quickly and income.
In addition, the frequency of various noises is concentrated mainly on below 30MHz in catv network, subscriber terminal equipment, faulty equipment, defective joint and power switch including coming from Web content etc. produce below 30MHz interference signal and noise, also from 5 ~ 30MHz of network-external interference noise, and the broadband access system of existing catv network mainly carries out upstream data transmission using below 50MHz frequency band, it is close with noise frequency, upstream data is affected by noise very big, is easily caused the appearance of error code.Therefore, the present invention is additionally used Higher frequency transmission user data, because the range of signal that Coaxial distribution network network is carried is 5 ~ 1000MHz, therefore it is proposed that transmits the data-signal of user using 100MHz ~ 1000MHz frequency.It is preferred that 860-1000MHz can be used, because may be located remotely from the frequency of CATV downstream signals.In addition, the present invention additionally uses WLAN protocol（IEEE802.i l) realize the transmission of data, the excellent antijamming capability that directly transplanting WLAN protocol has.The system construction drawing of broadband access is realized based on CATV nets below with reference to the present invention as shown in Figure 2, the broadband access system of the present invention is described in detail.The system mainly includes：Comprehensive converged light station 201, is connected with HFC optical-fiber networks side 107, is also connected with IP Metropolitan Area Network (MAN)s, be connected with duplexing blender 202；Duplexing blender 202 is sent to for the CATV optical signals from HFC optical-fiber networks side 107, the data-signal from IP Metropolitan Area Network (MAN)s to be converted into radiofrequency signal, and the radiofrequency signal from duplexing blender 202 is converted into data-signal and is sent to IP Metropolitan Area Network (MAN)s.Specifically, comprehensive converged light station 201 is made up of photoreceiver 2011, radio frequency amplifier 2012, Ethernet switch 2013 and multiple data insertion equipments 2014.Wherein,
Photoreceiver 2011 is connected with radio frequency amplifier 2012, and photoreceiver 2011 is used to receive described CATV optical signals, and is converted to radiofrequency signal and is sent to radio frequency amplifier 2012 and be amplified, and is then output to multiple duplexing blenders 202 of outside.
Ethernet switch 2013 is connected with multiple data insertion equipments 2014, and Ethernet switch 2013 is also connected with the IP Metropolitan Area Network (MAN)s, for realizing mutual forwarding of the data-signal between data insertion equipment 2014 and IP Metropolitan Area Network (MAN)s.Data insertion equipment 2014 is also connected with duplexing blender 202, and data insertion equipment 2014 is used for the conversion for realizing data-signal and radiofrequency signal, for convenience, the radiofrequency signal that data-signal is converted into is referred to as into data radio signal.Specifically, data insertion equipment 2014 is used to complete wireless protocols IEEE802.i l and ether Net the mutual conversion of IEEE802.3 agreements.From WLAN consensus standards, if using IEEE802. l ib agreements, transmission rate is up to 1 lMbps/22Mbps；If using IEEE802.11g or IEEE802.11a agreements, speed may be up to 54Mbps.Data insertion equipment 2014 also achieves a butt joint the control and management of access customer.
Broadband access system of the present invention also includes：
Duplexing blender 202, its number is as the number of data insertion equipment 2014, each duplex blender 202 is connected with above-mentioned radio frequency amplifier 2012, also distinguish --- accordingly it is connected with one in multiple data insertion equipments 2014, the duplexing effect of blender 202 is that radio frequency amplifier 2012 is sent into CATV radiofrequency signals（The radiofrequency signals of QAM containing DTV, similarly hereinafter）One new signal of generation, which is mixed, with the data radio signal progress that data insertion equipment 2014 is transmitted is sent to HFC Coaxial distribution network networks side 108, and blend the data radio signal solution uploaded from HFC Coaxial distribution network networks side 108 to come, it is sent to connected data insertion equipment 2014.When duplexing blender 202 is using frequency division multiplexing, then the high band carrying of mixed downstream signal is IEEE802.i l protocol signals, and low-frequency range carrying is CATV signals.And for upward signal, realization demultiplexes the IEEE802.i l protocol signals of carrying from the high band of upward signal to be come out.It will be apparent to those skilled in the art that silent work blender 202 can also be using modes such as time division multiplexings come two signals of multiplex/demultiplex, below no longer to this explanation.
HFC Coaxial distribution network networks side 108, the as coax network part of hfc plant, for carrying out multichannel distribution to radiofrequency signal sended over from duplexing blender 202, mixed, each splitter 109 is sent to, and sends the upward signal sent from splitter 109 to duplexing blender 202.
Splitter 109, it is connected with HFC Coaxial distribution network networks side 108, the TV, terminal access device 203 also with user are connected, the radiofrequency signal for receiving HFC Coaxial distribution network networks side 108, and CATV radiofrequency signals and data radio signal are isolated, it is sent respectively to electricity Depending on terminal access device 203;And the upstream data for sending over terminal access device 203 is sent to HFC Coaxial distribution network networks side 108.Specifically, exactly the high band and low-frequency range that receive signal are demultiplexed, the CATV radiofrequency signals for isolating the carrying of signal low-frequency range are sent to TV, and the IEEE802.i l protocol signals for isolating the carrying of signal high band are sent to terminal access device 203.And realize that the IEEE802.i l protocol signals of self terminal access device in future 203 are multiplexed into the high band of upward signal, it is transferred to HFC Coaxial distribution network networks side 108.
Terminal access device 203, with splitter 109 and subscriber computer（PC) it is connected, it may be arranged in user family, conversion for realizing radiofrequency signal and data-signal, specifically, realizes the conversion between the IEEE802.3 protocol signals from the computer being attached thereto and the IEEE802.i l protocol signals from splitter 109.
The schematic diagram of the comprehensive data insertion equipment 2014 of converged light station 201 of the present invention as shown in Figure 3, including：
Radio frequency interface unit and the Transmit Receive Unit being attached thereto, radio frequency interface unit are used to carry out power amplification to the radiofrequency signal for being modulated with wideband data, and provide radio frequency interface；Transmit Receive Unit is used for the reception and transmission for realizing radiofrequency signal.In actual Transmit Receive Unit and radio frequency interface unit circuit, by the impedance adjustment to rf modulation circuit part therein come the adjustment of the device such as matching network and frequency synthesizer, line filter, carrier wave is met the requirement of 860-lOOOMHz frequencies, realize the reception and transmission of the frequency range data radiofrequency signal.
Base band and MAC processing units, it is connected with described Transmit Receive Unit, processing of the unit according to 802.11 protocol realizations to the physical layer and MAC layer of data radiofrequency signal, the unit can be designed entirely by reference to the base band in ripe wlan system and MAC processing unit standards.
Ethernet interface unit and the Ethernet Transmit-Receive Unit being attached thereto, Ethernet interface unit are mainly used in realizing that ethernet signal isolation, there is provided ethernet standard interface, transmits the Ethernet data for meeting 802.3 standards with protection；Ethernet Transmit-Receive Unit is used to realize ethernet signal Receive and send.Ethernet Transmit-Receive Unit and Ethernet interface unit can use commodity ethernet
MAC and physical chip are realized.
Main CPU unit, is connected with the Ethernet Transmit-Receive Unit stated, the conversion for realizing Ethernet data signal and data radio signal format, and realizes the control to base band and MAC processing units, can be realized with universal cpu.Specifically, the form conversion of 802.11MAC frames and 802.3MAC frames is realized, is connected with base band and MAC processing units by bus, controlled it.The present invention has also correspondingly provided the data transmission method based on above-mentioned broadband access system.The downlink transfer of uplink and data including data.
Data downstream transmission as shown in Figure 4（User side direction is transferred to from network side）Flow chart, comprises the following steps：
Step 401:Data-signal is passed to data insertion equipment 2014 by the data-signal passed down by IP Metropolitan Area Network (MAN)s by Ethernet switch 2013 using 802.3 agreements.Data insertion equipment 2014 completes 802.3 to 802.11 protocol conversion, and the data signal modulation of reception is more than to the data radio signal of 860MHz high band into frequency（That is the signal of 802.11 protocol requirements）, the first signal is formed, duplexing blender 202 is sent to.On the other hand, photoreceiver 2011 receives the CATV optical signals from HFC optical-fiber networks side, and duplexing blender 202 is sent to after amplifying by radio frequency amplifier 2012.
Step 402:The CATV radiofrequency signals of low-frequency range of the duplexing blender 202 by the data radio signal of the high band from data insertion equipment 2014 and from radio frequency amplifier 2012 are by the way of frequency division multiplexing（Or time division multiplexing etc. mode）Mixed, form secondary signal, be sent to HFC Coaxial distribution network networks side 108;Corresponding splitter 109 is sent to by HFC Coaxial distribution network networks side 108.
Step 403:Splitter 109 isolates the data radio signal of high band carrying and the CATV signals of low-frequency range carrying from the secondary signal of reception, is sent respectively to TV and terminal connects Enter device 203.
Step 404:Terminal access device 203 receives the data radio signal from splitter 109, the protocol conversion of progress 802.11 to 802.3, data radio signal is converted to the data-signal of 802.3 protocol requirements, send the data equipments such as the computer of user to by the USB mouths or Ethernet interface that are connected with the data equipment such as computer, complete the downlink transfer of data.
Data upstream transmission as shown in Figure 5（Network side direction is transferred to from user side）Flow chart, comprises the following steps： '
Bu Sudden 501:Data-signal is passed through 802.3 agreements by the data equipments such as user side computer, it is sent to terminal access device 203, terminal access device 203 carries out 802.3 to 802.11 protocol conversion to data, and data signal modulation is more than to the data radio signal of 860MHz high band into frequency（That is the signal of 802.11 protocol requirements）, the 3rd signal is formed, splitter 109 is sent to.
Step 502:Splitter 109 is by the data radio signal of high band by the way of frequency division multiplexing（Or time division multiplexing etc. mode）It is mixed into the high band of upward signal, mixed upward signal is referred to herein as the 4th signal, is sent to HFC Coaxial distribution network networks side 108.
Step 503:Duplexing blender 202 receives the 4th up signal, and the data radio signal that demultiplexed high-frequency signal is carried from the signal from HFC Coaxial distribution network networks side 108, and is transferred to data insertion equipment 2014.
Bu Sudden 504:Data insertion equipment 2014 completes 802.11 to 802.3 protocol conversion, data radio signal is converted to the data-signal of Ethernet transmission, after being converged again by Ethernet switch 2013, it is sent to IP Metropolitan Area Network (MAN)s relevant device and carries out L3 Switching, by particular way by being sent to internet.
Pass through above scheme, as can be seen that the present invention need not change CATV HFC optical-fiber networks side, directly realize that user is accessed by CATV network broadbands using the HFC Coaxial distribution networks of catv network, relative to the broadband access implementation method of background technology, cost is low. The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, within the spirit and principles of the invention, any modification, equivalent substitution and improvements made etc., should be included in the scope of the protection.

Claims (1)

  1. Claims
    1st, a kind of system for realizing broadband access on the net in cable television, the cable television network includes HFC optical-fiber networks side（107) with HFC Coaxial distribution network networks side（108), it is characterised in that the system includes：Comprehensive converged light station（201), duplexing blender（202), splitter（109), terminal access device（203), wherein,
    Comprehensive converged light station（201) respectively with HFC optical-fiber networks side（107), IP Metropolitan Area Network (MAN)s, duplexing blender（202) it is connected, for HFC optical-fiber networks side will to be come from（107) CATV optical signals, the data-signal from IP Metropolitan Area Network (MAN)s are respectively converted into CATV radiofrequency signals and data radiofrequency signal is sent to duplexing blender（, and will be from duplexing blender 202)（202) data radio signal is converted to data-signal and is sent to IP Metropolitan Area Network (MAN)s；
    Duplexing blender（202) HFC Coaxial distribution network networks side, is passed through（And splitter 108)（109) it is connected, for comprehensive converged light station will to be come from（201) after CATV radiofrequency signals and data radiofrequency signal is multiplexed, it is sent to splitter（109), and by splitter（109) the demultiplexed data radio signal of signal uploaded is sent to comprehensive converged light station (201)；
    Splitter（109) with terminal access device（203) it is connected, for duplexing blender will to be come from（202) the demultiplexed data radio signal of signal sends terminal access device to（, and self terminal access device in future 203)（203) data radio signal multiplexing is sent to duplexing blender into upward signal（202) ；
    Terminal access device（203) it is used for the conversion for realizing data radio signal and data-signal.
    2nd, the system as claimed in claim 1, it is characterised in that described synthesis converged light station（201) include：Photoreceiver（2011), radio frequency amplifier（2012), Ethernet switch（And data insertion equipment 2013)（2014) ；Wherein,
    Photoreceiver（And radio frequency amplifier 2011)（2012), with outside HFC light nets Network side（107) it is connected, for by the CATV optical signals of reception, being converted to CATV radiofrequency signals and being sent to radio frequency amplifier；
    Radio frequency amplifier（2012) it is used to the CATV radiofrequency signals of reception being amplified, and exports to outside duplexing blender（202) ；
    Ethernet switch（2013) it is connected with data insertion equipment (2014), with the IP Metropolitan Area Network (MAN)s, for realizing data-signal in data insertion equipment（2014) forwarding between IP Metropolitan Area Network (MAN)s；
    Data insertion equipment（2014) also with outside duplexing blender（202) it is connected, the conversion for realizing data-signal and data radio signal.
    3rd, system as claimed in claim 2, it is characterised in that described data insertion equipment（2014) include：Radio frequency interface unit, Transmit Receive Unit, base band and MAC processing units, main CPU unit, Ethernet Transmit-Receive Unit and Ethernet interface unit, the unit are sequentially connected；Wherein,
    Transmit Receive Unit realizes the reception and transmission of data radio signal with radio frequency interface unit jointly；
    Base band and MAC processing units are used to realize the processing to the physical layer and MAC layer of data radiofrequency signal；
    Main CPU unit is used to realize data-signal and the conversion of data radio signal format, and the control to base band and MAC processing units；
    Ethernet Transmit-Receive Unit realizes the reception and transmission of data-signal with Ethernet interface unit jointly.
    4th, a kind of method for realizing broadband access on the net in cable television, the cable television network includes HFC optical-fiber networks side（107) with HFC Coaxial distribution network networks side（108), broadband access system includes comprehensive converged light station（201), silent work blender（202), splitter（109)、 Terminal access device（203), the broad band access method includes downlink transfer and the uplink of data, wherein,
    The downlink transfer of data includes step：
    Comprehensive converged light station（201) data-signal from IP Metropolitan Area Network (MAN)s is received, data radio signal is converted to and is sent to duplexing blender（202 ) ；
    Chinese work blender（202) by the data radio signal multiplexing of reception into descending radiofrequency signal, HFC Coaxial distribution network networks side is passed through（108) splitter is sent to（ 109 ) ；Splitter（109) the demultiplexed data radio signal of the radiofrequency signal of reception is sent to terminal access device（ 203 ) ；
    Terminal access device（203) data radio signal is converted into data-signal and is sent to user data terminal device；
    The uplink of data includes step：
    Terminal access device（203) data-signal from user data terminal device is converted into data radio signal and is sent to splitter（ 109 ) ；
    Splitter（109) by the data radio signal multiplexing of reception into up radiofrequency signal, HFC Coaxial distribution network networks side is passed through（108) it is sent to duplexing blender（202 ) ；
    Duplexing blender（202) the demultiplexed data radio signal of the radiofrequency signal of reception is sent to comprehensive converged light station（201 ) ；
    Comprehensive converged light station（201) will be from duplexing blender（202) data radio signal is converted to data-signal and is sent to IP Metropolitan Area Network (MAN)s.
    5th, method as claimed in claim 4, it is characterised in that described data radio signal is the radiofrequency signal more than 860MHz.
    6th, method as claimed in claim 4, it is characterised in that described data-signal is lan protocol signal, described data radio signal is WLAN protocol signal.
    7th, method as claimed in claim 6, it is characterised in that described lan protocol bag Include IEEE802.3 agreements；Described WLAN agreements include the lg agreements of IEEE802.11a, IEEE802.11b or IEEE 802.1.
    8th, method as claimed in claim 4, it is characterised in that the described frequency that is multiplexed with is multiplexed or is time-multiplexed.
CNB2004800150003A 2003-11-05 2004-11-04 Broadband access system and access method implemented on cable TV network Expired - Fee Related CN100345421C (en)

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PCT/CN2004/001256 WO2005046129A1 (en) 2003-11-05 2004-11-04 A system and access method for achieving broadband access in the cable television network

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CN101123695B (en) * 2006-08-07 2010-12-15 石方太 Wired TV network 'narrow band home access' transmission method
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