CN102333025A - Broadcasting and television two-way network system and smooth bandwidth-upgrading method thereof - Google Patents
Broadcasting and television two-way network system and smooth bandwidth-upgrading method thereof Download PDFInfo
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Abstract
The invention provides a broadcasting and television two-way network system and a smooth bandwidth-upgrading method thereof, which can meet the bandwidth requirement of the next-generation broadcasting and television network (NGB), realize the smooth upgrading of bandwidth and save the cost of system expansion and equipment upgrade. The invention is characterized in that: by utilizing the 1550nm optical transmission technology and the transmission technology based on an Ethernet passive optical network (EPON) and an Ethernet over Coax (EoC), the broadcasting and television two-way network system is constructed, the network is smoothly upgraded at multiple stages to meet the progressive development pattern of user access bandwidth, the overall network architecture of the broadcasting and television two-way network system is not changed in the process of smooth upgrading, bandwidth is changed as long as the upgrading of equipment, the change of the splitting ratio or the addition of coarse wavelength division multiplexers are carried out in an equipment room, and the invention can meet the requirement of the constant progressive development of user bandwidth and ultimately achieve 'megabit fiber to the home'.
Description
Technical field
The present invention relates to the field of television network broadcast bilateral network, relate in particular to the system and the method thereof of the smooth upgrade bandwidth of radio and television bilateral network.
Background technology
China's cable TV network as the important basis for IT application facility of country, has become the maximum cable TV network of userbase in the world through construction and the development in more than 20 years.State Council clearly indicates in " national economy and social development 11th Five-Year Plan outline ", strengthens infrastructure constructions such as broadband communication network, digital tv network, Next Generation Internet, advances " integration of three networks " to perfect the security assurance information system." integration of three networks " is meant that telecommunications network, computer network and cable television network three macroreticulars through technological transformation, can provide comprehensive multimedia communication services such as comprising voice, data, image.
According to China's cable TV network development and service operation present situation, access network system, access bandwidth demand are gradual increases.In order to satisfy the different application scene; User's access bandwidth demand of different stages of development; The total bandwidth of system can be supported the progressive pattern of development of user's access bandwidth, as 1-2Mbps-5-10Mbps-20-30Mbps-100Mbps extending user bandwidth (national white paper NGB bandwidth evolution strategy) progressively.
The present domestic two-way access technology that has multiple based on the cable of cable TV distribution network; But there is very big-difference in implementation; Device product is of a great variety, network carrying performance difference is big, and the bandwidth that provides after the transformation of television network broadcast bilateral network has nothing in common with each other, and what have only can satisfy present primary bandwidth demand; Direction and method to bandwidth upgrading are uncertain; The existing remodeling method of broadcasting and television network can't realize that on the existing network basis Fiber to the home, can not satisfy the requirement of television network broadcast of future generation (NGB) to the progressive development of bandwidth, and broadcasting and TV company in various places is all in the middle of studying and exploring energetically.
Summary of the invention
The invention provides the method for a kind of radio and television bilateral network system and smooth upgrade bandwidth thereof; Can satisfy the bandwidth demand of television network broadcast of future generation (NGB); Realize the bandwidth smooth upgrade; Save the cost of System Expansion, device upgrade, it is characterized in that, utilize the 1550nm optical transport technology, based on the passive optical network (EPON) of Ethernet and based on Ethernet transmission (EoC) technique construction radio and television bilateral network system of coaxial cable; And adopt multistage smooth upgrade network to satisfy the progressive development model of user's access bandwidth; In the process of smooth upgrade, the overall network framework of radio and television bilateral network need not be changed, and only in machine room, carries out device upgrade, changes splitting ratio or increases the change that Coarse Wave Division Multiplexer is realized bandwidth; Satisfy the needs of the continuous progressive development of user bandwidth, finally reach 100,000,000 and register one's residence.
Radio and television bilateral network system adopts dual channel mode (A, B passage) in this method; Two passage optical network structures are similar; All adopt FTTB (FTTB), each optical node is reserved 4 core fibres, and optical node covers in 50 families; In the construction, broadcast television signal transmits in the different fibre cores of same optical cable with the data light signal.The optical transport network of traditional broadcast television signal is called A channel, adopts the 1550nm wavelength on an optical fiber, to carry out optical transmission, is made up of EDFA Erbium-Doped Fiber Amplifier (EDFA), Optical Distribution Network and optical receiver.Utilize EDFA Erbium-Doped Fiber Amplifier to carry out the amplification and the transmission of radio and television light signal in this passage; The fiber distribution network comprises optical cable and optical branching device; Light signal is reasonably transmitted and distribute, and optical receiver receives light signal and is converted into the signal of telecommunication, sends into building inner cable distribution network.
In A channel, select for use double pumping action duplicate supply EDFA Erbium-Doped Fiber Amplifier (EDFA) to guarantee stabilization of equipment performance.Fiber distribution network (ODN) adopts three grades of beam split 3 * 4 * 8; Preceding two-stage optical splitter is placed on the branch center machine room, is called " indoor beam split ", can select splitting ratio as required neatly; Afterbody is placed on optical node place, sub-district, after two-way net transformation is accomplished, will no longer change.Select for use optical receiver to adapt to the needs that the network splitting ratio changes with low optical power input, high-gain output and light-operated AGC (automatic gain control) function.
B passage in this invention is meant the passive optical network based on Ethernet (EPON) of transmission of data signals, adopts descending 1490nm wavelength, up 1310nm wavelength to carry out optical transmission.The EPON network is made up of optical fiber cable termination equipment (OLT), fiber distribution network (ODN) and optical-fiber network allocation units (ONU) three parts, and ODN mainly comprises Passive Optical Components such as optical cable, optical branching device.Fiber distribution network (ODN) in the B passage adopts two-stage beam split 4 * 8, and first order beam split is placed on branch center machine room (indoor beam split), and the secondary beam split is placed on optical node place, sub-district, and is identical with afterbody position that optical splitter is put in the A channel.
After the A channel construction was accomplished, the B passage did not need again the trunk optical fiber link to be done repeated construction, only needed to add relevant device as required at minute machine room and sub-district optical node place, and the idle fibre core of launching in the optical cable gets final product, and accomplished two-way net transformation conveniently, efficiently.Utilize two optical fiber in the same optical cable; A channel uses an optical fiber with 1550nm wavelength transmission TV signal; The B passage uses another optical fiber with 1490nm (descending), 1310nm (up) wavelength transmission data-signal, and this Optical Fiber Transmission mode is called " two fine three ripples " transmission means.
When the signal of two passages through Optical Fiber Transmission behind the building; Select for use suitable EoC technology to be transferred to the user through coaxial cable distribution net in the building; The EoC system comprises coaxial distribution network and coaxial cable broadband access network incoming end equipment (CNU) in coaxial cable broadband access network local side apparatus (CBAT), the building; Coaxial cable broadband access network local side apparatus (CBAT) is placed on an optical node place, building; Import coaxial distribution network in the building into after the data-signal of the broadcast television signal of A channel and B passage mixed; Coaxial cable broadband access network incoming end equipment (CNU) is placed in the users home, can insert multiple user terminals such as HDTV, video request program, high speed Internet access, visual telephone.Utilize the EoC technology can make full use of the existing coaxial distribution network resource of broadcasting and television network, do not need to construct again and lay the cable of registering one's residence, time saving and energy saving, for the user two-way, a big capacity, broadband, digitized integrated information transmission network are provided quickly and easily.
In this method, bandwidth upgrading to hundred million can be six stages: the phase I: user's rate into family is 20%, and the each household bandwidth is 3Mbps, or user's rate into family is 20%, and the each household bandwidth is 6Mbps; Second stage: user's rate into family is 40%, and the each household bandwidth is 6Mbps; Phase III: user's rate into family is 60%, and the each household bandwidth is 10Mbps; Stage: user's rate into family is 80%, and the each household bandwidth is 15Mbps; Five-stage: user's rate into family is 80%, and the each household bandwidth is 30Mbps; The 6th stage: user's rate into family is 100%, and the each household bandwidth is 100Mbps.
In this method, along with the continuous escalation process of bandwidth, the two-way net of radio and television can be realized smooth upgrade through the adjustment of device upgrade or splitting ratio.From the phase I when second stage is upgraded, only need change the splitting ratio of B passage into 1 * 8 by 4 * 8 or 2 * 8; From the second stage to the phase III, be 10G OLT with the OLT device upgrade in the EPON network, second line of a couplet port provides 10G bandwidth, and splitting ratio is 4 * 8; During from the phase III to stage, only need change the splitting ratio of B passage into 2 * 8 by 4 * 8; During from stage to five-stage, only need change the splitting ratio of B passage into 1 * 8 by 2 * 8.Along with the continuous development and progress of society, network bandwidth requirements constantly enlarges, under the constant situation of network integral frame; Promptly during six stages, increase EDFA quantity, add Coarse Wave Division Multiplexer (CWDM) from five-stage to the; The mode of using " single fiber three ripples " instead is transmitted broadcast television signal and data-signal, promptly uses an Optical Fiber Transmission 1550nm, 1490nm and three wavelength of 1310nm, is called " single fiber three ripples " technology; Increase the quantity of terminal device, launch vacant cable core, the place selects suitable optical branching device for use in the Lou Dong unit; Light advances copper and moves back, and removes EoC system relevant device in the building, adopts the mode that Fiber to the home (FTTH) directly to register one's residence; Register one's residence for the user provides 100,000,000 bandwidth, satisfy the demand of NGB.
All optical branching devices that relate to all should be plane waveguide light shunt (PLC) or are at least three-wavelength fused biconical taper optical branching device in the two-way net of radio and television, satisfy the needs of three kinds of wavelength transmission of 1550nm/1490nm/1310nm.Be generally two shunt, three shunt, four shunt, eight shunt or 12 shunt in continuous used optical branching device model during upgrading of multistage; Other all use PLC the three-wavelength fused biconical taper except that three shunt are used, and involved optical branching device all should be placed in the corresponding optical branching device case in the machine room.All optical branching devices can use repeatedly, and the splitter of replacing can be used in suitable developing stage of later stage, improve usage ratio of equipment.
Optical fiber link in the two-way net machine room of radio and television between the equipment all adopts the jumper connection mode, selects for use jumping fiber or tail optical fiber to connect.When the selective light splitter, the optical branching device that directly goes out tail optical fiber be need select for use, and the come in and go out length of tail optical fiber of optical branching device, the direct connection device of tail optical fiber confirmed according to the length of link.So not only can reduce the insertion loss of chain pipeline connector, more can adjust splitting ratio quickly and easily, replace optical branching device neatly, guarantee to realize smooth upgrade under the constant situation of system configuration.
The invention is characterized in that radio and television bilateral network system adopts A, the twin-channel mode of B, A channel is used to transmit traditional broadcast television signal, adopts 1550nm wavelength light transmission system, and the B passage is used for transmission of data signals, adopts the EPON access network technology.
Characteristic of the present invention is that also the smooth upgrade later stage adds Coarse Wave Division Multiplexer (CWDM), adopts the mode of single fiber three ripples.
Characteristic of the present invention also is; Smooth upgrade adopts FTTB (FTTB) in earlier stage, with the building method of the different cores of cable; Each optical node covers in 50 families; Arrive Lou Donghou, adopt the EoC technology that the mixed signal of A, B passage is transferred to subscriber household through coaxial cable distribution system in the building, the smooth upgrade later stage, directly Fiber to the home (FTTH).
Characteristic of the present invention is that also the multistage smooth upgrade is six stages, and the phase I: user's rate into family is 20%, and the each household bandwidth is 3Mbps, or user's rate into family is 20%, and the each household bandwidth is 6Mbps; Second stage: user's rate into family is 40%, and the each household bandwidth is 6Mbps; Phase III: user's rate into family is 60%, and the each household bandwidth is 10Mbps; Stage: user's rate into family is 80%, and the each household bandwidth is 15Mbps; Five-stage: user's rate into family is 80%, and the each household bandwidth is 30Mbps; The 6th stage: user's rate into family is 100%, and the each household bandwidth is 100Mbps.
Characteristic of the present invention is that also in above-mentioned process at smooth upgrade, the television network broadcast overall architecture does not change, and the equipment that is meant is formed, the branch center machine room does not change to the trunk optical-fiber network between the light partial node, main equipment types etc.
Characteristic of the present invention also is; " only in machine room, carry out device upgrade, change splitting ratio or increase the change that Coarse Wave Division Multiplexer is realized bandwidth " being meant from the phase I when second stage is upgraded, only need change the splitting ratio of B passage into 1 * 8 by 4 * 8 or 2 * 8; From the second stage to the phase III, be 10G OLT with the OLT device upgrade in the EPON network, second line of a couplet port provides 10G bandwidth, and splitting ratio is 4 * 8; During from the phase III to stage, only need change the splitting ratio of B passage into 2 * 8 by 4 * 8; During from stage to five-stage, only need change the splitting ratio of B passage into 1 * 8 by 2 * 8; From five-stage to the during six stages; Add Coarse Wave Division Multiplexer (CWDM), the mode of using single fiber three ripples instead is launched vacant cable core; Every unit is selected suitable optical branching device for use in the building; Adopt the mode that Fiber to the home (FTTH) directly to register one's residence, register one's residence, satisfy the demand of NGB for the user provides 100,000,000 bandwidth.
Characteristic of the present invention is that also the mode that jumping fiber or tail optical fiber jumper connection are adopted in the connection in the machine room between the equipment to change equipment in the machine room easily and flexibly, satisfies the needs of different phase bandwidth.
Characteristic of the present invention also is; Three is three-wavelength fused tapered optical branching device along separate routes in the system; Need satisfy the needs that the 1550nm/1310nm/1490nm three-wavelength transmits simultaneously; PLC type optical branching device is adopted in two shunt, four shunt, eight shunt and 12 along separate routes, and the optical branching device that replace early stage can reuse in the later stage development stages.
Radio and television bilateral network of the present invention system adopts the method for above-mentioned radio and television bilateral network smooth upgrade bandwidth to make up; This system comprises that the optical transport network of transmission traditional broadcast television signal, the passive optical network based on Ethernet (EPON) of transmission of data signals reach the building inner cable distribution network three parts composition based on Ethernet transmission (EoC) technology of coaxial cable; It is characterized in that; This system adopts " two fine three ripples " structure construction binary channels; Utilization constitutes broadcast television signal and the same route of data light signal with the different cores of cable, and adopts " indoor beam split " structure, makes the splitting ratio of whole network can carry out flexible configuration according to actual needs.
The invention has the advantages that the initial stage that bilateral network is built; Can make full use of the television network broadcast existing resource; Make up a multiple service supporting network that satisfies the current bandwidth needs fast, simply, cheaply, and above multistage constantly during upgrading, the integral frame of two-way net need not change; Need not lay backbone optical cable again in ten to 15 years; And involved optical branching device can use repeatedly, and the optical branching device of replacing can be reused during developing stage in the later stage, did not cause the waste of device resource; Can make full use of existing optical-fiber network and existing equipment; Realize two-way net upgrading constantly with minimum input again, make the two-way net of radio and television in the process of " integration of three networks ", can satisfy the ever-increasing needs of user bandwidth flexibly quickly and accurately, satisfy the needs of multifunctional services such as HDTV, video request program and integrated information, data service; Having huge social benefit and economic benefit, is a kind of method preferably that the two-way net of current broadcast TV network is transformed.
Description of drawings
Fig. 1, Fig. 3 are the phase I layout of equipment;
Fig. 2 is stand-type optical branching device case figure;
Fig. 4 is the second stage layout of equipment;
Fig. 5 is the phase III layout of equipment;
Fig. 6 is the stage layout of equipment;
Fig. 7 is the five-stage layout of equipment;
Fig. 8 is the 6th stage layout of equipment.
1. EDFA Erbium-Doped Fiber Amplifiers (EDFA) among the figure, 2. three fens optical branching devices (being called for short three along separate routes), 3. four fens PLC optical branching devices (be called for short four PLC) along separate routes, 4.ODF frame (fibre distribution frame); 5.5Km with interior 4 core optical cables, 6. eight fens PLC optical branching devices (be called for short eight PLC) along separate routes, 7. optical receiver; 8.OLT, 9. four fens PLC optical branching devices (be called for short four PLC) along separate routes, 10. eight fens PLC optical branching devices (be called for short eight PLC) along separate routes; 11.ONU, 12. coaxial cable broadband access network local side apparatus (CBAT) (CBAT), the coaxial distribution network of 13. corridors; 14. coaxial cable broadband access network incoming end equipment (CNU), 15. TV set-top boxes (STB), 16. computers (PC); 17. phone (PHONE), 18. 2 fens PLC optical branching devices (being called for short two shunt PLC), 19.10G OLT; 20. four fens PLC optical branching devices (four shunt PLC), 21. 2 fens PLC optical branching devices (being called for short two shunt PLC), 22. 2 fens PLC optical branching devices (being called for short two shunt PLC); 23. Coarse Wave Division Multiplexer (CWDM), 24. 8 fens optical branching devices or 12 fens PLC optical branching devices (being called for short eight fens or 12 splitter PLC), 25.G.657B covered wire cable.
The practical implementation way
Phase I:The two-way net of radio and television adopts two fine three ripple transmission meanss, utilizes with the construction scheme of the different cores of cable and builds.The A channel optical link is set out by EDFA equipment, through three grades of beam split (3 * 4 * 8), arrives a building optical receiver and carries out inserting coaxial distribution network in the building after photoelectricity transforms.Wherein EDFA (1) adopts the 22dB EDFA Erbium-Doped Fiber Amplifier of double pumping action duplicate supply among Fig. 1; Three shunt (2) all adopt the principle of " indoor beam split " to be placed on the branch center machine room with four shunt PLC (3); Be placed in the corresponding stand-type optical branching device case (as shown in Figure 2); Each optical branching device case is put three splitters, and the fine U type mouth behind the stand-type optical branching device case of coming in and going out stretches out jumper connection to corresponding apparatus.The fiber jumper connection of four shunt PLC (3) is to fibre distribution frame (ODF frame) (4) relevant position; ODF frame (4) and eight is connected with interior 4 core optical cables (5) by 5Km between the PLC (6) along separate routes; A channel takies first core, and eight shunt PLC (6) are placed on cell centre as the light partial node, adopts 4 core optical cables to connect from eight shunt PLC (6) to optical receiver (7); Take first core, each optical node covers the user down and is no more than 50 families.Wherein three shunt (2) are three-wavelength fused biconical taper optical branching device; Four shunt PLC (3), eight PLC (6) along separate routes are PLC type optical branching device; Connect between each equipment in the machine room and all adopt jumper connection mode, optical receiver should have low optical power input, high-gain output and light-operated AGC function.
B passage optical signals OLT (8) sets out, and optical link arrives a building ONU (11) through two-stage beam split (4 * 8).Wherein four shunt PLC (9) are placed on the branch center machine room, and four shunt PLC (9) are placed in the stand-type optical branching device case (as shown in Figure 2), and each optical branching device case is put four four along separate routes.PLC (6) are the same along separate routes with eight for eight shunt PLC (10); All at cell centre light partial node place; The second line of a couplet mouth of going into fine and OLT (8) of four shunt PLC (9) (claiming PON (EPON) mouthful again) is in the same place with the wire jumper jumper connection; The fiber jumper connection of four shunt PLC (9) is to ODF frame (4) relevant position, and ODF frame (4) and eight is connected with interior 4 core optical cables (5) by 5Km between the PLC (10) along separate routes, and the B passage takies second core; Adopt 4 core optical cables to connect from eight shunt PLC (10) to ONU (11), take second core.PON mouth 32 beam split of each OLT this moment (8), i.e. 32 ONU of each PON mouth second line of a couplet.
The traditional broadcast television signal of A channel transmission and the data-signal of B channel transfer arrive Lou Donghou, insert in the users home through the EoC system.CBAT (12) arrives CNU (14) through the coaxial distribution network of corridor (13) after TV signal and data-signal are mixed; CNU in users home (14) can connect STB (15), PC (16) and PHONE (17); Thereby services such as TV, broadband, video voice are provided for the user, realize " integration of three networks ".
Each ONU bandwidth=1000M/4/8=31.25Mbps of this stage, this moment, user's rate into family was 20%, average each household bandwidth=31.25Mbps/50 * 20% ≈ 3Mbps.
If the shunt PLC of four among Fig. 1 (9) is changed to the PLC (18) along separate routes of two among Fig. 3 in the phase I; Two shunt PLC (18) select PLC type optical branching device for use; The fibre of going into of two shunt PLC (18) is located the fine pairing PON mouth jumper connection of going into jumping fiber and former four shunt PLC (9); The fiber jumper connection of two shunt PLC (18) is to corresponding ODF frame, and this moment, the B passage adopted 2 * 8 secondary beam-splitting structures, i.e. each PON mouth 16 beam split.
This moment, each ONU bandwidth was=1000M/2/8=62.5Mbps, and user's rate into family is 20%, average each household bandwidth=62.5Mbps/50 * 20% ≈ 6Mbps.
Second stage:As shown in Figure 4, the network overall architecture is motionless, only increases the PON mouth quantity of OLT, and the shunt PLC of two among Fig. 3 (18) is removed, and to corresponding ODF frame, do not change by other equipment with the direct jumper connection of optical patchcord for the PON mouth of OLT.PON mouth of B passage this moment directly connects one eight PLC, i.e. each PON mouth 8 beam split along separate routes.
Each ONU bandwidth=1000M/8=125Mbps of this stage, this moment, user's rate into family was 40%, average each household bandwidth is=125Mbps/50 * 40% ≈ 6Mbps.
Phase III:As shown in Figure 5; The network overall architecture is motionless, is 10G OLT (19) with used OLT device upgrade in the original EPON system only, four along separate routes PLC (20) go into the PON mouth of fine jumper connection to 10G OLT (19); The fiber jumper connection of four shunt PLC (20) is to ODF frame relevant position, and other are not changed.Four shunt PLC (20) can reactivate the four shunt PLC (9) of original phase I, and this moment, the B passage adopted 4 * 8 secondary beam-splitting structures, i.e. each PON mouth 32 beam split.
Each ONU bandwidth=10G/4/8=312.5Mbps of this stage, this moment, user's rate into family was 60%, average each household bandwidth is=312.5Mbps/50 * 60% ≈ 10Mbps.
Stage:As shown in Figure 6; The network overall architecture is motionless; Increase the PON mouth quantity of 10G OLT in the EPON system, only with among Fig. 5 four along separate routes PLC (20) change two PLC (21) along separate routes into, two going into the jumping fiber jumper connection of PLC (21) along separate routes to the corresponding 10G PON of OLT mouth; The fiber jumper connection is to ODF frame relevant position, and other are not changed.Two shunt PLC can reactivate two splitter PLC in the phase I, and this moment, the B passage adopted 2 * 8 secondary beam-splitting structures, i.e. each PON mouth 16 beam split.
Each ONU bandwidth=10G/2/8=625Mbps of this stage, this moment, user's rate into family was 80%, average each household bandwidth is=625Mbps/50 * 80% ≈ 15Mbps.
Five-stage:As shown in Figure 7, the network overall architecture is motionless, only adds the PON mouth quantity of 10G OLT in the EPON system, and two shunt PLC (21) among Fig. 6 are removed, and to the ODF frame, other do not change the PON mouth of OLT with the direct jumper connection of optical patchcord.A 10G PON of B passage this moment mouth directly connects one eight PLC, i.e. each PON mouth 8 beam split along separate routes.
Each ONU bandwidth=10G/8=1250 Mbps of this stage, this moment, user's rate into family was 80%, average each household bandwidth is=1250 Mbps/50 * 80% ≈ 30Mbps.
The 6th stage:As shown in Figure 8, the network overall architecture is motionless.This stage user's request bandwidth needs to increase the equipment of each branch center machine room up to 100Mbps, adopts single fiber three ripples; Four optical fiber in the four optical-fiber cable are all launched; Each core arrives a Lou Dong unit, continues " light advances copper and moves back ", and Fiber to the home (FTTH) in completion.Need not change from the branch center machine room to the optical-fiber network the light partial node this moment or construction again.The broadcast television signal that the EDFA of branch center machine room sees off is divided into the two paths of signals transmission through two shunt PLC (22); Two along separate routes PLC (22) go into the delivery outlet of fine jumper connection to EDFA; The fiber jumper connection is to the inlet of CWDM (23); The PON mouth of 10G OLT is through optical patchcord jumper connection another inlet to CWDM (23); Broadcast television signal and data-signal are just through multiplexing being in the same place of CWDM (23) like this, and the outlet of CWDM (24) is connected on the ODF frame relevant position through optical patchcord, with interior 4 core optical cables mixed signal are sent to light partial node (placing eight shunt PLC here) through 5Km again.When mixed signal is transferred to the unit light node, change optical receiver into corresponding optical branching device, confirm light beam split number along separate routes according to floor or number of users, adopted eight fens or 12 shunt PLC (24), Fiber to the home to select G.657B covered wire cable (25) at last for use.
Each ONU bandwidth=10G/8=1250 Mbps of this stage, this moment 100% user's rate into family, the assignable bandwidth of each ONU is 10000/8/12 ≈ 100Mbps, promptly average each household bandwidth is 100Mbps.
Claims (10)
1. the method for a radio and television bilateral network smooth upgrade bandwidth; Can satisfy the bandwidth demand of television network broadcast of future generation (NGB), realize the bandwidth smooth upgrade, save the cost of System Expansion, device upgrade; It is characterized in that; Utilize the 1550nm optical transport technology, based on the passive optical network (EPON) of Ethernet and based on Ethernet transmission (EoC) technique construction radio and television bilateral network system of coaxial cable, and adopt multistage smooth upgrade network to satisfy the progressive development model of user's access bandwidth, in the process of smooth upgrade; The overall network framework of radio and television bilateral network need not be changed; Only in machine room, carry out device upgrade, change splitting ratio or increase the change that Coarse Wave Division Multiplexer is realized bandwidth, satisfy the needs of the continuous progressive development of user bandwidth, finally reach 100,000,000 and register one's residence.
2. method according to claim 1 is characterized in that, radio and television bilateral network system adopts A, the twin-channel mode of B; A channel is used to transmit traditional broadcast television signal; Adopt 1550nm wavelength light transmission system, the B passage is used for transmission of data signals, adopts the EPON access network technology.
3. method according to claim 1 is characterized in that, the smooth upgrade later stage adds Coarse Wave Division Multiplexer CWDM, adopts the mode of single fiber three ripples.
4. method according to claim 1; It is characterized in that; Smooth upgrade adopts FTTB (FTTB) in earlier stage, with the building method of the different cores of cable, each optical node covers in 50 families, arrives Lou Donghou; Adopt the EoC technology that the mixed signal of A, B passage is transferred to subscriber household through coaxial cable distribution system in the building, the smooth upgrade later stage, directly Fiber to the home (FTTH).
5. method according to claim 1 is characterized in that, the multistage smooth upgrade is six stages, and the phase I: user's rate into family is 20%, each household bandwidth 3Mbps, or user's rate into family is 20%, the each household bandwidth is 6Mbps; Second stage: user's rate into family is 40%, and the each household bandwidth is 6Mbps; Phase III: user's rate into family is 60%, and the each household bandwidth is 10Mbps; Stage: user's rate into family is 80%, and the each household bandwidth is 15Mbps; Five-stage: user's rate into family is 80%, and the each household bandwidth is 30Mbps; The 6th stage: user's rate into family is 100%, and the each household bandwidth is 100Mbps.
6. method according to claim 1; It is characterized in that; In above-mentioned process at smooth upgrade, the television network broadcast overall architecture does not change, and the equipment that is meant is formed, the branch center machine room does not change to the trunk optical-fiber network between the light partial node, main equipment types etc.
7. according to claim 1 or 5 described methods; It is characterized in that; " only in machine room, carry out device upgrade, change splitting ratio or increase the change that Coarse Wave Division Multiplexer is realized bandwidth " being meant from the phase I when second stage is upgraded, only need change the splitting ratio of B passage into 1 * 8 by 4 * 8 or 2 * 8; From the second stage to the phase III, be 10G OLT with the OLT device upgrade in the EPON network, second line of a couplet port provides 10G bandwidth, and splitting ratio is 4 * 8; During from the phase III to stage, only need change the splitting ratio of B passage into 2 * 8 by 4 * 8; During from stage to five-stage, only need change the splitting ratio of B passage into 1 * 8 by 2 * 8; During six stages, add Coarse Wave Division Multiplexer (CWDM), the mode of using single fiber three ripples instead from five-stage to the; Launch vacant cable core, select suitable optical branching device for use, adopt the mode that Fiber to the home (FTTH) directly to register one's residence at Lou Dong; Register one's residence for the user provides 100,000,000 bandwidth, satisfy the demand of NGB.
8. method according to claim 5 is characterized in that, the mode that jumping fiber or tail optical fiber jumper connection are adopted in the connection in the machine room between the equipment to change equipment in the machine room easily and flexibly, satisfies the needs of different phase bandwidth.
9. method according to claim 5; It is characterized in that; Three is three-wavelength fused tapered optical branching device along separate routes in the system; Need satisfy the needs that the 1550nm/1310nm/1490nm three-wavelength transmits simultaneously, PLC type optical branching device is adopted in two shunt, four shunt, eight shunt and 12 along separate routes, and the optical branching device that replace early stage can reuse in the later stage development stages.
10. radio and television bilateral network system that the method that adopts each said radio and television bilateral network smooth upgrade bandwidth among the claim 1-9 makes up; This system comprises that the optical transport network of transmission traditional broadcast television signal, the passive optical network based on Ethernet (EPON) of transmission of data signals reach the building inner cable distribution network three parts composition based on Ethernet transmission (EoC) technology of coaxial cable; It is characterized in that; This system adopts " two fine three ripples " structure construction binary channels; Utilization constitutes broadcast television signal and the same route of data light signal with the different cores of cable; And adopt " indoor beam split " structure, make the splitting ratio of whole network can carry out flexible configuration according to actual needs.
Priority Applications (1)
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