CN202353724U - Two-way broadcasting television network system - Google Patents

Abstract

The utility model provides a two-way broadcasting television network system which mainly comprises an optical transmission network, an Ethernet-based passive optical network (EPON) and an intra-building cable distribution network, wherein the optical transmission network is used for transmitting a traditional broadcasting television signal, the EPON is used for transmitting a data signal, the intra-building cable distribution network is based on an Ethernet over cable (EoC) technology; and the two-way broadcasting television network system is characterized in that the system is built by adopting two channels, two optical fibers in the same one cable are utilized, wherein the television signal is transmitted in the first one of the two channels by one optical fiber with 1,550nm wavelength, the data signal is transmitted in the second one of the two channels by the other one optical fiber with 1,490nm downlink wavelength and 1,310nm uplink wavelength, and other optical dividers are arranged in a branch center machine room except for eight optical dividers at optical partial nodes in a community.

Description

A kind of radio and television bilateral network system

Technical field

The utility model relates to the field of television network broadcast, relates in particular to the two-way net of cable TV Access Network system.

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." networking, digitlization, two-wayization " of television network broadcast transformed, and is one of current cable TV network urgent task.

Though the various places cable TV network has carried out work such as DTV turn over, two-way net transformation to some extent, but the form of various places, standard disunity, and construction cost is higher and lack the technical support that continues.The present domestic two-way access technology that has multiple based on the cable TV Access Network; But there is very big-difference in implementation, and device product is of a great variety, network carrying performance difference is big, on the one hand; The appearance of numerous technical schemes has reflected the demand in market, and the space provides more choices; On the other hand, numerous schemes have brought difficulty also for the construction of overall network framework.How to consider the broadband trend of data service in the future, the two-way net of the cable TV system that makes up an ability smooth upgrade becomes the difficult problem that cable TV network two-way net in various places is transformed.

Summary of the invention

The utility model provides a kind of radio and television bilateral network system; Comprise that mainly 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 binary channels to make up; Utilize two optical fiber in the same optical cable, wherein twin-channel first passage uses an optical fiber with 1550nm wavelength transmission TV signal, and second channel uses another optical fiber with descending 1490nm, up 1310nm wavelength transmission data-signal; And except that eight splitters at light partial node place, sub-district, other optical branching devices are placed on the branch center machine room.

Adopt " two fine three ripples " mode to make up binary channels in this utility model; Be first passage and second channel; Two passage optical network structures are similar, all adopt FTTB (FTTB), and each optical node is reserved 4 core fibres; Optical node covers in 50 families, and broadcast digital television signals transmits in the different fibre cores of same optical cable with the data light signal in the construction.Utilize two optical fiber in the same optical cable; First passage uses an optical fiber with 1550nm wavelength transmission TV signal; Second channel 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.

First passage is the optical transport network of transmission traditional broadcast television signal, 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 first passage, 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 branch center machine room (being called " indoor beam split "); Can select splitting ratio, afterbody to be placed on optical node place, sub-district as required neatly, 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.

Second channel in this utility model 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 second channel 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 afterbody optical splitter placement location is identical in the first passage.

After the first passage construction is accomplished; Second channel does not need again the trunk optical fiber link to be done repeated construction; Only need to add relevant device as required at minute machine room and light partial node place, sub-district, the idle fibre core of launching in the optical cable gets final product, and accomplishes two-way net transformation conveniently, efficiently.

When the signal of two passages through Optical Fiber Transmission behind the building; Select for use suitable Ethernet transmission (EoC) technology to be transferred to the user through coaxial cable distribution net in the building based on coaxial cable; 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 first passage and second channel mixed; Coaxial cable broadband access network incoming end equipment (CNU) is placed in the users home, can insert multiple user terminals such as digital TV in high resolution, 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.

The optical branching device that all relate in the utility model all should be plane waveguide light shunt (PLC) or is at least three-wavelength fused biconical taper optical branching device, satisfies the needs of three kinds of wavelength transmission of 1550nm/1490nm/1310nm.Optical branching device all is placed in the stand-type optical branching device case, and the tail optical fiber length of selecting as required to come in and go out perhaps selects ring flange as inlet, with the jumper connection modes such as all adopting wire jumper or tail optical fiber that is connected between other equipment.When the user bandwidth demand growth, can be in the machine room of branch center four in the EPON system being changed along separate routes is two along separate routes, perhaps removes splitter, changes the splitting ratio of whole second channel into 2 * 8,1 * 8 by 4 * 8, makes user bandwidth improve 2 times or 4 times.After only OLT being upgraded to 10G OLT, system can provide the 20-30M bandwidth.When advancing copper, light moves back; Optical fiber is registered one's residence behind the condition maturity; After selecting for use wavelength-division multiplex technique to change two fine three ripples into single fiber three ripples; Only at dilatation relevant device port in the machine room of branch center, add wavelength division multiplexer, can realize that with wire jumper jumper connection equipment again 100,000,000 register one's residence, under the situation that the overall architecture of network need not be changed, can satisfy the bandwidth demand of television network broadcast of future generation (NGB).

Description of drawings

Fig. 1 is a radio and television bilateral network system equipment allocation plan

Fig. 2 is a stand-type optical branching device case sketch map

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 minutes PLC optical branching devices (being called for short four shunt PLC), 4. fibre distribution frames (ODF 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), the coaxial distribution network of 13. corridors, 14. coaxial cable broadband access network incoming end equipment (CNU); 15. TV set-top box (STB), 16. computers (PC), 17. phones (PHONE)

Embodiment

As shown in Figure 1.The two-way net of radio and television adopts two fine three ripple transmission meanss, utilizes with the different core construction schemes of cable and builds.The first passage 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 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; First passage 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.

Second channel 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); Be placed on cell centre light partial node place, the fibre of going into of four shunt PLC (9) is in the same place with the wire jumper jumper connection with the second line of a couplet mouth of OLT (8), and the fiber jumper connection of four shunt PLC (9) is to ODF frame (4) relevant position; ODF frame (4) and eight is connected with interior 4 core optical cables (5) by 5Km between the PLC (10) along separate routes; Second channel takies second core, adopts 4 core optical cables to connect from eight shunt PLC (10) to ONU (11), takies second core.Second line of a couplet mouth 32 beam split of each OLT this moment (8), i.e. 32 ONU of each second line of a couplet mouth second line of a couplet.

The traditional broadcast television signal and the second channel data signals transmitted of first passage transmission 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 ".

Claims (7)

1. radio and television bilateral network system; Comprise that mainly 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 binary channels to make up; Utilize two optical fiber in the same optical cable, wherein twin-channel first passage uses an optical fiber with 1550nm wavelength transmission TV signal, and second channel uses another optical fiber with descending 1490nm, up 1310nm wavelength transmission data-signal; And except that eight splitters at light partial node place, sub-district, other optical branching devices are placed on the branch center machine room.

2. system according to claim 1 is characterized in that first passage in the binary channels the serve as reasons optical transport network of transmission traditional broadcast television signal, the passive optical network based on Ethernet (EPON) that the second channel in the binary channels is transmission of data signals.

3. system according to claim 1 is characterized in that the optical transport network that transmits the traditional broadcast television signal selects the 1550nm optical transport technology for use, and FTTB (FTTB) light net is transformed, and optical node covers number of users in 50 families.

4. system according to claim 1 is characterized in that the broadcast television signal and the data-signal that transmit in the binary channels utilize Ethernet transmission (EoC) technical transmission based on coaxial cable to arrive the user through building inner cable distribution network.

5. system according to claim 2 is characterized in that broadcast television signal transmits in the different fibre cores of same optical cable with the data light signal, and each light partial node is reserved 4 cores.

6. system according to claim 2; It is characterized in that the preceding two-stage optical branching device in three grades of beam split 3 * 4 * 8 in the first passage, the first order optical branching device in the two-stage beam split 4 * 8 in the second channel all are placed on the branch center machine room, are placed in the rack splitter case.

7. system according to claim 6; It is characterized in that optical branching device all adopts planar waveguide-type optical branching device or three-wavelength fused biconical taper optical branching device; Said three-wavelength is 1550nm/1310nm/1490nm, is connected the mode that all adopts jumper connection between optical branching device and other equipment.

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