CN100448213C - HFC network wideband access system based on MoCA technology - Google Patents

HFC network wideband access system based on MoCA technology Download PDF

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Publication number
CN100448213C
CN100448213C CNB2007100006934A CN200710000693A CN100448213C CN 100448213 C CN100448213 C CN 100448213C CN B2007100006934 A CNB2007100006934 A CN B2007100006934A CN 200710000693 A CN200710000693 A CN 200710000693A CN 100448213 C CN100448213 C CN 100448213C
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signal
jumper
cable
network
access network
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CN101030907A (en
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陈勇
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陈勇
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Abstract

The system comprises: a wideband access gateway installed on the HFC network optical node and multi wideband access modems installed in the users' home. The interface between the gateway and the modems is realized by using MoCA technology. Each gateway provides 400 Mbps shared access bandwidth for 200-500 users under on optical node, supports 120 users simultaneously on-line, and provides the QoS service and the data encryption function.

Description

Hfc plant broadband access system based on the MoCA technology
Technical field
The present invention relates to hfc plant broadband access technology in the field of network communication.
Background technology
Along with the development of network communication and video compression technology, provide broadband Video service such as video request program, video conference, online game just progressively to become the main business developing direction of Virtual network operator for the domestic consumer by broadband networks.But, because the video content occupied bandwidth will be carried out these Video service the transmission bandwidth of core net and Access Network is also had higher requirement far above voice and traditional data business.
Core net such as existing SDH, DWDM and linear speed route switching transmission switching technologies are through a few years ago high speed development, and are very ripe, can satisfy the demand of large-capacity video program transmission to bandwidth, and the deficiency of access network bandwidth become main bottleneck.
Hfc plant itself has very high band width in physical as one of the widest access network of present coverage.But since existing based on the restriction on the Cable Modem access technology of HFC net, make HFC net big superiority bandwidth and can not give full play to.
Cable Modem connecting system is made of headend CMTS and user side Cable Modem.CMTS generally is installed in wired network front end/sub-headend machine room, realizes IP data and radiofrequency signal translation function, and IP network interface and HFC are provided online down going channel radio frequency interface.Cable Modem places user house, demodulates the IP data from the radiofrequency signal that wire cable transmits, and exports to the network terminals such as computer, IP set-top box.
Cable Modem access technology is risen in the U.S., and standard is mainly formulated by some U.S. high-tech companies.The relatively dispersion that the general family of the U.S. lives, the number of users that each HFC net optical node covers is few, and network quality is relatively good again, thereby average access bandwidth height, and network connects reliable and stable, and occupation rate of market is higher than the ADSL access technology based on telephone wire.And in China and some other country, Cable Modem access technology occupation rate of market but is significantly less than ADSL, and this mainly is the reason owing to following several respects:
1. access bandwidth deficiency
According to the highest Euro DOCSIS 2.0 standards of bandwidth, the down going channel of each CMTS is supported the bandwidth of 52Mbps, and data feedback channel is supported the bandwidth of 30Mbps.Because the domestic user lives intensively, and 200-500 user arranged under each optical node, every CMTS equipment need provide access service for 2000-4000 user under 4-8 the optical node, on average has only the speed of hundreds of K bit to each user.
2. the network connective stability is poor
According to the DOCSIS standard, each Cable Modem down channel takies a simulated television passage in the 87-860MHz band limits, and up channel is operated in the low-frequency range of 5-42MHz (U.S. mark) or 5-65MHz (Europe superscript).Upward signal sends from the Cable Modem of user side, converges to the up input port of CMTS, and all noises of introducing at user side all can converge with upward signal, form the leak noise.And China's various places hfc plant quality is uneven, and uplink signal-channel quality can't guarantee that the user surfs the Net and goes offline easily.
3. network rebuilding quantities is big, and investment is high
Use Cable Modem system, must carry out bidirectional rebuilding to existing hfc plant earlier.Reforming content comprises equipment such as increasing backlight transmitter, backlight receiver, sign-changing amplifier.Simultaneously, for improving the uplink channel signals quality, also need to change subscriber box and the relatively poor service cable of shielding, this makes that the quantities of the network rebuilding is all bigger with investment.Simultaneously the CMTS equipment price is also very high, thereby has increased the operation risk of operator greatly, is difficult to guarantee that early investment can regain smoothly.
Owing to above reason, Cable Modem system is not able to extensive use at home.
Along with the development of network communications technology, very big variation has all taken place in hfc plant overall architecture and network transmission technology.At present, most of regional optical fiber has been routed to the residential quarter, and each sub-district optical node generally all can leave 4-6 root optical fiber interface, removes to be used to transmit cable TV and to occupy outside 1 optical fiber, also has optical fiber more than needed to can be used for the transmission broadband data.Adopt technology maturation, cheap Ethernet optical switch and optical transceiver equipment, only need re-use wherein 1 optical fiber, the broadband network that just can realize from the sub-district optical node to wired network front end/sub-headend machine room inserts, and access speed can reach 100Mbps or 1000Mbps.
From user family, can utilize wired coaxial cable to realize broadband access to the sub-district optical node.Coaxial cable itself has very high bandwidth, can reach more than the 1GHz.Wired operator has only utilized 750MHz or the following low frequency part transfer of unidirectional TV programme of 860Mhz wherein, and HFS does not have to use substantially.It is few that the coaxial cable high band has channel disturbance, can utilize advantages such as bandwidth, is used to transmit the bi-directional data signal, can provide very high access bandwidth for the user, can guarantee the network connection stability simultaneously, also can not influence the normal transmission of TV programme.
The MoCA technology is based on coaxial cable and realizes interconnected international standard between the household internal network equipment, is operated in high band, and very high physical layer transmission bandwidth can be provided.The MoCA technology is used for the broadband access of hfc plant, and it is low to solve the access bandwidth that existing CableModem system exists, the problem of network connective stability difference.
MoCA is the abbreviation of English Multimedia over Coax Alliance, is International Standards Organization that is initiated jointly to set up by companies such as Cisco, Comcast, EchoStar, Entropic, Motorola, Toshiba.This standard is mainly used in interconnected between the household internal network equipment, has stipulated physical layer and data link layer standard that broadband multi-medium datas such as Internet video, voice, recreation utilize coaxial cable to transmit between various home network access devices and terminal equipment.
The analog bandwidth that each MoCA data channel takies is 50MHz, operating frequency range be 800MHz to 1500MHz, and can in this frequency range, select the different operating frequency according to the real work needs.Data-modulated adopts qam mode, and the physical layer transmission bandwidth has reached 270Mbps, and the data throughout of practical application can reach more than the 100Mbps.There is not frequency overlap between the different pieces of information transmission channel analog channel, stackable use, thus can provide higher bandwidth for the user.
Summary of the invention
The present invention is a kind of hfc plant broadband access system that utilizes the MoCA technology to realize.Whole connecting system is made of broad access network gate, broadband access Modem and jumper.
1. broad access network gate
Broad access network gate is installed in hfc plant optical node place and uses, and mainly realizes following function: the conversion between the route that is connected (2) IP packet, forwarding (3) IP packet and the high-frequency modulation signal of (1) and core net.
Broad access network gate provides the optical Ethernet interface, can be connected with network equipments such as the Ethernet optical transceiver that is positioned at cable television network front end or sub-headend machine room, switches by monomode fiber, the broadband access of realization from the optical node to the core net, access bandwidth can reach 1Gbps.
Broad access network gate provides 1 the road or the multiway cable interface, and respectively corresponding 1 the road or the multiway cable distribution network.The IP packet that transmits from core net finds out its cable distribution network of living in according to destination address, carries out routing forwarding in gateway, sends into corresponding MoCA module and handles.
Comprise one or more MoCA modulation and frequency-variable modules inside the Pass the broadband access network, corresponding one by one with cable interface.After the IP packet is modulated frequency conversion through the MoCA module, mix with the TV signal of optical workstation output, and mixed signal is transferred in the user family by cable distribution network.TV signal can realize inside the Pass broadband access network with mixing of high-frequency modulation signal, also can realize outside gateway.
2. broadband access Modem
Broadband access Modem is installed in the cable TV subscriber family and uses.The coaxial cable of receiving in the user family comprises TV signal and high-frequency modulation signal, broadband access Modem therefrom takes out the high-frequency modulation signal that comprises the IP packet, in the MoCA processing module, carry out frequency conversion and demodulation process, restore the IP packet, through routing forwarding, send into equipment such as computer, IP set-top box, soho router.
3. jumper
In cable distribution network, used the place of amplifier that jumper need be installed.Because the amplifier in the existing hfc plant can only amplify downstream television signals, maximum operating frequency generally has only 750MHz or 860MHz.Adopting the high-frequency radio frequency signal of MoCA technology modulation is two-way signaling, and operating frequency is higher, can't be by existing unidirectional amplifier.Utilize jumper to address this problem.
The mixed signal that comprises TV signal and high-frequency modulation signal is at first sent into jumper, and jumper separates these two signals in inside, and TV signal is exported to original amplifier amplification, and high-frequency modulation signal is in inner regeneration of jumper or directly amplification.Send into jumper again through the TV signal of amplifying, after mixing, send into the downstream cables distribution network again through the high-frequency modulation signal that amplifies or regenerate.Can't be by the problem of unidirectional amplifier thereby solved through the high-frequency modulation signal of MoCA technology modulation.
Broad access network gate and jumper all need be installed in wild environment, thereby all adopt the water proof type aluminum hull, are designed to water proof type equipment.Broad access network gate and jumper are all supported 220V and two kinds of supply power modes of 60V, guarantee can pass through cable power supply in the place that does not have the 220V condition of power supply.
Compare with existing various hfc plant access technologies, the invention has the beneficial effects as follows:
(1) the present invention is not needing to lay again under the prerequisite of optical fiber and cable, utilizes existing hfc plant resource, just can provide high access bandwidth for the user.Every road cable output of broad access network gate can provide the physics access bandwidth of 270Mbps, the data throughout that 100Mbps is above.Corresponding with optical workstation output, every gateway generally has 4 tunnel outputs, thereby can be the physics access bandwidth that a 200-500 user under the optical node provides 1000Mbps, and the 400Mbps data throughout is to have tens times of Cable Modem system now.Can satisfy whole users fully and carry out the demand that all service interfacings such as video request program, video communication, online game are gone into bandwidth.
(2) because the technical down going channel of MoCA all is operated in high band, and can select different frequent points according to actual needs for use, can avoid being subject to the noise jamming frequency range, solve the problem of low frequency noises, network stabilization connects highly stable.
(3) gateway is connected with front end and has adopted technology maturation, optical Ethernet technology with low cost, can significantly reduce equipment cost, and very high access bandwidth is provided.
(4) broad access network gate can be according to the actual output of optical workstation way, is configured to 1 the road or multichannel output, realizes the fusion with existing hfc plant easily.
(5) provide QoS mechanism and network security encryption function based on the MoCA technology, make this connecting system can guarantee the service quality of real-time communication traffics such as video conference, IP phone, and the security guarantee of abundance is provided for the broadband user who uses this connecting system.
Description of drawings
Fig. 1 is system's syndeton schematic diagram;
Fig. 2 is the broad access network gate structural representation;
Fig. 3 is the jumper structural representation;
Fig. 4 is a broadband access Modem structural representation.
Embodiment
Now reaching embodiment in conjunction with the accompanying drawings is described in further detail the present invention.
With reference to figure 1, whole connecting system structure as shown in the figure.Data-signal 104 passes to broad access network gate 102 by optical fiber from the ethernet device 101 of front end/sub-headend, and optical workstation 103 outputs 1 road or multi-channel TV signals 105 are given broad access network gate 102.Broad access network gate mixes TV signal with data-signal through the MoCA technical finesse, export 1 the road or multichannel mixed signal 106.Mixed signal 106 is sent in the user family by coaxial cable and branch distributor 107,108 etc.Broadband access Modem 109 gives computer 111 respectively, set-top box 112 take out demodulated data signal from mixed signal after.
The data that computer 111, set-top box 112 send are introduced into broadband access Modem 109, after the MoCA technical finesse, send into broad access network gate 102 by branch distributor 107 and coaxial cable, in gateway, solve original data signal 104, send into the ethernet device 101 that is positioned at front end/sub-headend by optical fiber.
With reference to figure 2, data-signal 104 is sent into broad access network gate by optical fiber, is introduced into photoelectric conversion module 201 and is converted to the signal of telecommunication, enters Routing Forward Module 202 again.Routing Forward Module 202 is forwarded to the corresponding port according to packet rs destination address cable distribution network of living in packet, and packet enters corresponding MoCA processing module 203 from this port and finishes mac-layer protocol conversion, modulation and frequency-conversion processing.The high-frequency modulation signal that obtains enters duplexer 204 to be mixed with TV signal 105, obtains mixed signal 106.Mixed signal 106 is sent in the cable TV subscriber family by corresponding cable distribution network.
The up mixed signal 106 that transmits by cable distribution network enters duplexer 204, and upward signal does not comprise TV signal and directly exports to MoCA processing module 203.MoCA processing module 203 is converted to the IP packet through frequency conversion, demodulation, mac-layer protocol, sends into Routing Forward Module 202.Routing Forward Module 202 is sent the upstream data bag into photoelectric conversion module 201, obtains data-signal 104, sends wired front end/sub-headend network equipment to by optical fiber.
With reference to figure 3, mixed signal enters jumper, in duplexer 301 low frequency TV signal 105 and data-signal 104 are separated, TV signal 105 is sent into original unidirectional amplifier 302 amplifications, and data-signal 104 is regenerated by MoCA signal regeneration or amplification module 303 in jumper or amplified.Output is sent into duplexer 304 respectively and is mixed, and obtains giving the downstream cables distribution network through the mixed signal 106 of amplifying.
With reference to figure 4, mixed signal 106 is sent into broadband access Modem by coaxial cable, in duplexer 401 data-signal 104 and TV signal 105 are separated earlier, data-signal 104 is sent into MoCA processing module 402 and is realized that frequency conversion, demodulation, mac-layer protocol are converted to the IP packet.According to IP packet actual purpose address, Routing Forward Module 403 is sent packet into IP set-top box 404, computer 405 or other network-termination devices.
The above execution mode only is the preferred embodiments of the present invention; the invention is not restricted to the foregoing description; for persons skilled in the art; the any conspicuous change of under the prerequisite that does not deviate from the principle of the invention it being done all belongs to the protection range of design of the present invention and claims.

Claims (2)

1. a hfc plant broadband access system mainly is made of broad access network gate, broadband access Modem and jumper, it is characterized in that:
The coaxial cable interface physical layer of broad access network gate and broadband access Modem and medium access control layer are realized based on the MoCA technology;
Broad access network gate is installed in hfc plant optical node place and uses, and supports the optical Ethernet interface, is connected with the data network equipment that is positioned at cable television network front end or sub-headend machine room by optical fiber, realizes network insertion;
It is 1 the road or the multichannel high-frequency modulation signal that broad access network gate utilizes the MoCA technology that the IP packet is modulated frequency conversion respectively, and mix with 1 road or multi-channel TV signals of optical workstation output respectively, mixed signal is sent in the cable TV subscriber family by cable distribution network;
Broadband access Modem is installed in the cable TV subscriber family and uses, and comprises the high-frequency modulation signal of IP packet in the mixed signal that its taking-up coaxial cable transmits, and frequency conversion demodulates the IP packet based on the MoCA technology, sends into computer or STB terminal equipment;
Used the place of amplifier that jumper is installed in the cable distribution network, realize the transmitted in both directions of high-frequency modulation signal by wired TV amplifier, TV signal is separated in jumper with high-frequency modulation signal, TV signal is sent into and is input to jumper again after amplifier amplifies, high-frequency modulation signal mixes with the TV signal that process is amplified through amplification or regeneration back in jumper inside, sends into the downstream cables distribution network.
2. system according to claim 1 is characterized in that:
Broad access network gate and jumper are the outdoor version rain-proof equipment;
Broad access network gate and jumper are supported 220V and two kinds of supply power modes of 60V.
CNB2007100006934A 2007-01-17 2007-01-17 HFC network wideband access system based on MoCA technology Expired - Fee Related CN100448213C (en)

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