CN102056016A - Bi-directional digital TV video on demand realizing device with PON (Passive Optical Network) and IPQAM (Internet Protocol Quadrature Amplitude Modulator) structure - Google Patents
Bi-directional digital TV video on demand realizing device with PON (Passive Optical Network) and IPQAM (Internet Protocol Quadrature Amplitude Modulator) structure Download PDFInfo
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Abstract
The invention relates to a Bi-directional digital TV video on demand realizing device with a PON (Passive Optical Network) and IPQAM (Internet Protocol Quadrature Amplitude Modulator) structure, in particular to a device which realizes space division multiplexing by extending the PON and downwards moving the IPQAM. The traditional IPQAM product arranged in a centre machine room or front machine room occupies more frequency bandwidth resources of a coaxial cable to cause a great waste of analog bandwidth. The IPQAM is moved from the centre machine room or the front machine room to a cell or light station, thereby multiplexing the frequency bandwidth resources of the coaxial cable and completely solving the problem of insufficient frequency resources of a coaxial cable network. With the technical scheme, space division multiplexing can be realized by downwards moving IPQAM equipment, the frequency utilization ratio of an HFC (Hybrid Fiber and Coax) network is greatly increased, and an optimal video transmission scheme is provided for the integration of three networks. The Bi-directional digital TV video on demand realizing device can be widely applied to occasions such as video on-demand, bi-direction interactive TV and the like.
Description
One, technical field
Patent of the present invention relates to the bi-directional digital television program request implement device of a kind of PON, IPQAM structure, and particularly a kind of PON of utilization extends IPQAM and moves down a kind of device of realizing space division multiplexing.
Two, background technology
Prior art is placed on central machine room or headend room with IPQAM equipment, takies the analog bandwidth of a large amount of coaxial cables.
Three, summary of the invention
The problem that solves: existing IPQAM product, be placed on central machine room or headend room, will take the frequency bandwidth resource of sizable coaxial cable, cause the problem of a large amount of analog bandwidth wastes.
Technical scheme: as shown in Figure 1,101 is GuangDian Center's machine room, and 102 is the broadcasting and TV headend room, and 103 is the HFC fiber optic network, and 104 is HFC light station, and 105 is the ONU of EPON or GPON, and 106 is IPQAM equipment, and 108 is the coaxial cable net in the hfc plant; 107 is the STB terminal user; 109 is the STB terminal user;
101 is GuangDian Center's machine room, in broadcast control system is arranged; Broadcast control system comprises: (1) audio frequency, video program source storage system, (2) program request control appliance, (3) live telecast signal; Link together by studio equipment, realize live telecast, the program request of two-way television; Central machine room has a circuit to connect the Internet in addition, and the Internet of GuangDian Center's machine room is connected with the broadcasting and TV sub-headend by core net, realizes the broadband access network of CHINA RFTCOM Co Ltd;
102 is the broadcasting and TV headend room, suitable for readingly is connected with central machine room by core net, and end opening is connected with sub-district machine room or light station; The OLT that EPON, GPON or wavelength-division PON are arranged in the headend room, the signaling-information that order video signal that core net is transmitted from central machine room or user side are communicated by letter with broadcasting centre, transmit EPON, the GPON at light station or the ONU of wavelength-division PON by optical fiber, the signaling-information and the internet data of broadcast television signal, two-way program request is transferred to light station or amplifier;
103 is the HFC fiber optic network, the broadcast singal of transmission radio and television, and the signal of the descending transmission of HFC has the broadcast singal in a plurality of live radio station and the television broadcasting signal that broadcasting centre is broadcast, and both anolog TV signals can be arranged, and also digital television signal can be arranged; Realize the transmission of EPON, GPON or wavelength-division PON signal simultaneously by wavelength division multiplexing or different optical fiber, realize the following biography of order video signal, the signaling-information transmission of two-way program request and internet data transmission;
104 is HFC light station, will be modulated to the signal of telecommunication of radio and television by the analog TV broadcasting light signal that Optical Fiber Transmission is come, and is transferred to each user by the coaxial cable net;
105 is the ONU of EPON, GPON or wavelength-division PON, and with the data-signal that OLT sends, the video data of (1) program request sends IPQAM equipment to; (2) wideband data sends the Ethernet local side apparatus at HFC light station to, and refile holds equipment for user's ethernet user; (3) signaling of the two-way planter top box of user being seen through PON equipment and equipment of the core network and broadcasting centre communicates;
106 is IPQAM equipment, and audio frequency, video data stream that the ONU of EPON, GPON or wavelength-division PON signal is sent here are modulated to vision signal, broadcast in the correspondent frequency scope;
108 is the coaxial cable net in the hfc plant, the broadcast singal transmission tone video broadcast signal of (1) transmission radio and television; (2) vision signal of transmission VOD system; (3) the transmission ethernet signal comprises: the two-way ethernet communication data of the two-way signaling of program request and the Internet;
107,109 is the STB terminal user, and set-top box is responsible for the decoding of broadcast television signal and the decoding of IPQAM broadcast television signal, and sound, video data stream are converted to image, sound.
The formation of system: the broadcasting centre of central machine room; Headend room; The HFC fiber optic network; HFC light station; The OLT of EPON, GPON or wavelength-division PON; The ONU of EPON, GPON or wavelength-division PON; IPQAM equipment; Coaxial cable net in the hfc plant; The STB terminal user;
The IPQAM signaling-information is transmitted by duplex channel, and two-way channel can solve by the scheme of DOCSIS or the scheme of EoC; The channel of internet transmission.
Operation principle: IPQAM by central machine room or headend room, is moved on to sub-district or light station; Thereby realized the multiplexing of coaxial cable frequency resource, thoroughly solved the problem of coaxial cable net frequency resource deficiency; The program request signal of its IPQAM is sent to headend room by the core net central machine room, delivers to IPQAM equipment by EPON or GPON by headend room again; After being modulated into radiofrequency signal by IPQAM, send to the coaxial cable net, play for set-top box.
System extension implementation: scheme 1: along with the increase of user's number under the IPQAM, when bandwidth resources are not enough, IPQAM equipment is moved down, realize the frequency resource spatial reuse, thereby make full use of its frequency resource.Scheme 2:, when bandwidth resources are not enough, increase an IPQAM equipment it is arranged on different frequencies, thereby realize the multiplexing of IPQAM equipment along with number of users under the IPQAM increases; When frequency resource is not enough, re-use the 1st kind of scheme, IPQAM equipment is moved down.Can thoroughly solve the not enough problem of coaxial cable frequency resource like this.
At the coaxial cable of the HFC cable television network that the DOCSIS system is arranged, the light station is the return path signal that the signal of 5-65MHz is used as DOCSIS, and 87MHz-862MHz is as broadcasting and TV downstream signal.
Because CHINA RFTCOM Co Ltd HFC is tree type or star-like coax network, adopt optical splitter to realize the distribution Star Network of broadcast television signal at fiber section, but the implementation space was multiplexing after IPQAM equipment moved down, thereby realized the following application of same frequency at different coaxial cables.
As shown in Figure 2,201 is broadcasting centre, and 202 is the broadcasting centre optical splitter, 203 is image intensifer, and 204 is the sub-headend optical splitter, and 205 is image intensifer, 206 is the light station, and 207 is amplifier, 208,209,210,211 4 road signal of telecommunication branch roads for electric amplifier output.
The TV signal of each channel of the broadcast of 201 broadcasting centres comprises anolog TV signals and through QAM modulated digital TV signal, is converted to the optical fiber that light signal send 201 broadcasting centres through electric light; 202 is the broadcasting centre optical splitter, signal in the optical fiber is divided into several delivers to each sub-headend; 203 is the sub-headend image intensifer, and the signal of importing is amplified; 204 is the sub-headend optical splitter, signal is divided into the several signal after, deliver to each light station; 205 is image intensifer, send 206 after 204 signals of sending here are amplified; 206 is the light station, exports after the light signal of sending here is converted to the signal of telecommunication, and the signal of telecommunication of output can directly connect the user, also can deliver to electric amplifier 207 and signal is amplified the back connect the user; 207 is amplifier, and the signal that the light station is sent here amplifies back connection user; 208 first branch roads for electric amplifier output.
Suppose that an IPQAM equipment has the frequency of 4 8MHz, take the simulation frequency range of 32MHz, the frequency of 32MHz can be supported 64 tunnel TV signal program requests, TV network company programming has the frequency of 192MHz to be used for the program request of IPQAM signal, and then the frequency range of 192MHz can be supported the program request of 1536 different television signals streams altogether; Suppose that each optical splitter is 1: 32, i.e. one tunnel input, 32 tunnel outputs; 8 electric amplifiers can be supported in each light station, and promptly a light station input electrical signal can connect 8 electric amplifiers; An electric amplifier has the output of 4 road signals of telecommunication.Annotate: followingly all compare with the calculation of capacity of same hypothesis.Ratio in the real network can be different.
If the insertion point of IPQAM signal is placed on 201 ends, the coverage face maximum of IPQAM then, its IPQAM signal can cover whole cable TV HFC net; But the number of users as the program request support is minimum, can only support 1536 user's request programs in the whole cable TV network;
If the insertion point of IPQAM signal is placed on 203 ends, then IPQAM can support 32 * 1536 user's request programs.
If the insertion point of IPQAM signal is placed on 205 ends, then IPQAM can support 32 * 32 * 1536 user's request programs.
If the insertion point of IPQAM signal is placed on 207 ends, then IPQAM can support 8 * 32 * 32 * 1536 user's request programs.
If the insertion point of IPQAM signal is placed on 208 ends, then IPQAM can support 4 * 8 * 32 * 32 * 1536 user's request programs.
Therefore when two-way some broadcasting user is few, IPQAM equipment can be placed on the place near front end, Tou Zi equipment is few like this, and cost is low; Continuous increase along with the program request number of users, the position of IPQAM insertion point constantly moves down, and so just can guarantee that more user can realize the two-way television program request, along with constantly moving down of IPQAM insertion point, can satisfy cable TV network user's program request demand, satisfy the needs of the following integration of three networks.
Be the signal flow schematic diagram; 301 are the Broadcast Control platform, 302 is the OLT of EPON or GPON, 303 is the upward signal of EPON or GPON, 304 is the downstream signal of EPON or GPON, 305 is the ONU of EPON or GPON, 306 is coaxial cable Ethernet local side apparatus, 307 is coaxial cable, and 308 for the coaxial cable ethernet user holds equipment, 309 lines of holding the two-way planter top box of equipment and user to be connected for the coaxial cable ethernet user, 311 is two-way planter top box, 310 is IPQAM equipment, and 312 is the insertion holding wire of IPQAM, and 313 is the fiber optic cables or the coaxial cable of HFC CATV transmission, 314 is frequency mixer, and 315 is the Internet net.
301 are the Broadcast Control platform, and this platform is realized the broadcast of cable tv broadcast signal, and the broadcast of IPQAM program request signal is to the decoding of IPQAM request program; 302 is the OLT of EPON or GPON, and the OLT upper end directly links to each other with the Broadcast Control platform by Ethernet, and the lower end is connected to a plurality of ONU by optical splitter; 303 is the upward signal of EPON or GPON, transmits up ethernet signal, and upward signal comprises, the up Ethernet data of (1) the Internet, the signaling-information of (2) bi-directional digital television program request; 304 is the downstream signal of EPON or GPON, is (1) the Internet downstream signal, the downlink signaling signal of (2) bi-directional digital television program request, (3) IPQAM video on demand video program stream signal; 305 is the ONU of EPON or GPON, up OLT with EPON or GPON is connected by optical splitter, (1) ethernet signal: be connected with the local side apparatus of ethernet device, the transport of internet signal, (2) signaling-information of transmission two-way television program request, the vision signal of the program request of (3) descending one-way transmission IPQAM; 306 is coaxial cable Ethernet local side apparatus, and one section is connected with the ONU Ethernet interface of EPON or GPON, and the other end is logical to be connected with ethernet user's end equipment; 307 is coaxial cable, by modulation system transmission ethernet signal; 308 for the coaxial cable ethernet user holds equipment, and the upper end connects the Ethernet local side apparatus, and the lower end is connected with set-top box or computer by Ethernet; 309 lines of holding the two-way planter top box of equipment and user to be connected for the coaxial cable ethernet user; 311 is two-way planter top box, and the broadcast singal of (1) set-top box is sent here by 314, and (2) are sent here by 308 the signaling of bi-directional set-top box, and (3) are sent here by 308 Ethernets the two-way video signal of IPQAM; 310 is IPQAM equipment, is the video-on-demand signals transmission equipment, and connection ONU equipment suitable for reading will be transferred to ONU by OLT from the vision signal that the program request platform is sent here, be sent to IPQAM again, is converted to radiofrequency signal by coaxial cable or Optical Fiber Transmission; 312 is the insertion holding wire of IPQAM, the radiofrequency signal of IPQAM output is sent to frequency mixer carries out mixing, sends set-top box to by optical fiber or coaxial cable after the mixing; 313 is the fiber optic cables or the coaxial cable of HFC CATV transmission;
314 is frequency mixer, and frequency mixer is suitable for reading two kinds of signals: the video-on-demand signals that (1) IPQAM sends here, the broadcast video signal that (2) Broadcast Control platform is sent here; The method of mixing has two kinds: (1) electricity mixes, and (2) light mixes; Adopt electric mixed method to carry out for coaxial cable, adopt light to mix for optical fiber.Electricity mixes the employing filter, adds the distributor circuit and realizes; Light mixes the optical fiber that adopts similar optical splitter to be realized.
The transmission of the program request signal of IPQAM: after broadcast control system received the program request signaling that the user sends, after system verification was legal users, video stream data was sent to corresponding IPQAM equipment; The path of transmission is that the video stream data of VOD system is sent to the broadcasting and TV front end core network device that needs transmission through core net; The nucleus equipment of broadcasting and TV front end sends data to the OLT equipment of EPON, GPON or wavelength-division PON again, and wavelength-division is by the HFC fiber optic network; Or by the other optical fiber of HFC; Be sent to the ONU end of EPON, GPON or wavelength-division PON; The Ethernet interface of corresponding ONU end sends the data of program request to IPQAM equipment, and the IPQAM device translates is that vision signal is used for the legal users set-top box.Transmission path adopts IP map addresses technology to realize: its implementation is, each subscriber computer top box is according to being inserted in CA card in the set-top box, produce one ID number; Be stored in for this ID number in the Broadcast Control database of broadcasting centre, and store the program request authority of respective user; When user's set-top box sends the program request signaling to broadcast control system, ID number of producing according to the CA card of broadcast control system, and user's request program number sends broadcast control system to; After broadcast control system is verified as validated user, the IP address of the IPQAM of the correspondence of inquiring user, the video flowing of correspondence is sent to the IPQAM equipment of respective user set-top box by the IP bag, IPQAM equipment is according to ID number of the subscriber computer top box, the network video stream data are converted to the radio frequency flow data of IPQAM, and the descending control flows by IPQAM sends frequency and corresponding video stream number to the subscriber computer top box, set-top box is according to rf frequency and video stream number, video flowing to correspondence is decoded, the Display Realization video request program.
Beneficial effect: the technical program can realize space division multiplexing after IPQAM equipment is moved down, and improves the frequency efficiency of HFC net greatly, for the integration of three networks provides best video transmission scheme.
Four, description of drawings
Fig. 1 IPQAM system architecture schematic diagram
Fig. 2 moves down the empty schematic diagram that divides
Fig. 3 IPQAM program request signal and the processing of uploading signaling
Five, embodiment
Below in conjunction with accompanying drawing embodiments of the present invention are described in detail:
Preferred embodiment 1: system group network
Should use example, be the formation block diagram of whole system, as shown in Figure 1,101 is GuangDian Center's machine room, 102 is the broadcasting and TV headend room, and 103 is the HFC fiber optic network, and 104 is HFC light station, 105 is the ONU of EPON or GPON, and 106 is IPQAM equipment, and 108 is the coaxial cable net in the hfc plant; 107 is the STB terminal user; 109 is the STB terminal user;
101 is GuangDian Center's machine room, in broadcast control system is arranged; Broadcast control system comprises: (1) audio frequency, video program source storage system, (2) program request control appliance, (3) live telecast signal; Link together by studio equipment, realize live telecast, the program request of two-way television; Central machine room has a circuit to connect the Internet in addition, and the Internet of GuangDian Center's machine room is connected with the broadcasting and TV sub-headend by core net, realizes the broadband access network of CHINA RFTCOM Co Ltd;
102 is the broadcasting and TV headend room, suitable for readingly is connected with central machine room by core net, and end opening is connected with sub-district machine room or light station; The OLT that EPON, GPON or wavelength-division PON are arranged in the headend room, the signaling-information that order video signal that core net is transmitted from central machine room or user side are communicated by letter with broadcasting centre, transmit EPON, the GPON at light station or the ONU of wavelength-division PON by optical fiber, the signaling-information and the internet data of broadcast television signal, two-way program request is transferred to light station or amplifier;
103 is the HFC fiber optic network, the broadcast singal of transmission radio and television, and the signal of the descending transmission of HFC has the broadcast singal in a plurality of live radio station and the television broadcasting signal that broadcasting centre is broadcast, and both anolog TV signals can be arranged, and also digital television signal can be arranged; Realize the transmission of EPON, GPON or wavelength-division PON signal simultaneously by wavelength division multiplexing or different optical fiber, realize the following biography of order video signal, the signaling-information transmission of two-way program request and internet data transmission;
104 is HFC light station, will be modulated to the signal of telecommunication of radio and television by the analog TV broadcasting light signal that Optical Fiber Transmission is come, and is transferred to each user by the coaxial cable net;
105 is the ONU of EPON, GPON or wavelength-division PON, and with the data-signal that OLT sends, the video data of (1) program request sends IPQAM equipment to; (2) wideband data sends the Ethernet local side apparatus at HFC light station to, and refile holds equipment for user's ethernet user; (3) signaling of the two-way planter top box of user being seen through PON equipment and equipment of the core network and broadcasting centre communicates;
106 is I PQAM equipment, and audio frequency, video data stream that the ONU of EPON, GPON or wavelength-division PON signal is sent here are modulated to vision signal, broadcast in the correspondent frequency scope;
108 is the coaxial cable net in the hfc plant, the broadcast singal transmission tone video broadcast signal of (1) transmission radio and television; (2) vision signal of transmission VOD system; (3) the transmission ethernet signal comprises: the two-way ethernet communication data of the two-way signaling of program request and the Internet;
107,109 is the STB terminal user, and set-top box is responsible for the decoding of broadcast television signal and the decoding of IPQAM broadcast television signal, and sound, video data stream are converted to image, sound.
The formation of system: the broadcasting centre of central machine room; Headend room; The HFC fiber optic network; HFC light station; The OLT of EPON, GPON or wavelength-division PON; The ONU of EPON, GPON or wavelength-division PON; IPQAM equipment; Coaxial cable net in the hfc plant; The STB terminal user;
The IPQAM signaling-information is transmitted by duplex channel, and two-way channel can solve by the scheme of DOCSIS or the scheme of EoC; The channel of internet transmission.
Operation principle: IPQAM by central machine room or headend room, is moved on to sub-district or light station; Thereby realized the multiplexing of coaxial cable frequency resource, thoroughly solved the problem of coaxial cable net frequency resource deficiency; The program request signal of its IPQAM is sent to headend room by the core net central machine room, delivers to IPQAM equipment by EPON or GPON by headend room again; After being modulated into radiofrequency signal by IPQAM, send to the coaxial cable net, play for set-top box.
Preferred embodiment 2:
The system extension implementation:
Scheme 1: along with the increase of user's number under the IPQAM, when bandwidth resources are not enough, IPQAM equipment is moved down, realize the frequency resource spatial reuse, thereby make full use of its frequency resource.
Scheme 2:, when bandwidth resources are not enough, increase an IPQAM equipment it is arranged on different frequencies, thereby realize the multiplexing of IPQAM equipment along with number of users under the IPQAM increases; When frequency resource is not enough, re-use the 1st kind of scheme, IPQAM equipment is moved down.Can thoroughly solve the not enough problem of coaxial cable frequency resource like this.
The empty implementation method of dividing in preferred embodiment 3:IPQAM and HFC light station
At the coaxial cable of the HFC cable television network that the DOCSIS system is arranged, the light station is the return path signal that the signal of 5-65MHz is used as DOCSIS, and 87MHz-862MHz is as broadcasting and TV downstream signal.
Because CHINA RFTCOM Co Ltd HFC is tree type or star-like coax network, adopt optical splitter to realize the distribution Star Network of broadcast television signal at fiber section, but the implementation space was multiplexing after IPQAM equipment moved down, thereby realized the following application of same frequency at different coaxial cables.
As shown in Figure 2,201 is broadcasting centre, and 202 is the broadcasting centre optical splitter, 203 is image intensifer, and 204 is the sub-headend optical splitter, and 205 is image intensifer, 206 is the light station, and 207 is amplifier, 208,209,210,211 4 road signal of telecommunication branch roads for electric amplifier output.
The TV signal of each channel of the broadcast of 201 broadcasting centres comprises anolog TV signals and through QAM modulated digital TV signal, is converted to the optical fiber that light signal send 201 broadcasting centres through electric light; 202 is the broadcasting centre optical splitter, signal in the optical fiber is divided into several delivers to each sub-headend; 203 is the sub-headend image intensifer, and the signal of importing is amplified; 204 is the sub-headend optical splitter, signal is divided into the several signal after, deliver to each light station; 205 is image intensifer, send 206 after 204 signals of sending here are amplified; 206 is the light station, exports after the light signal of sending here is converted to the signal of telecommunication, and the signal of telecommunication of output can directly connect the user, also can deliver to electric amplifier 207 and signal is amplified the back connect the user; 207 is amplifier, and the signal that the light station is sent here amplifies back connection user; 208 first branch roads for electric amplifier output.
Suppose that an IPQAM equipment has the frequency of 4 8MHz, take the simulation frequency range of 32MHz, the frequency of 32MHz can be supported 64 tunnel TV signal program requests, TV network company programming has the frequency of 192MHz to be used for the program request of IPQAM signal, and then the frequency range of 192MHz can be supported the program request of 1536 different television signals streams altogether; Suppose that each optical splitter is 1: 32, i.e. one tunnel input, 32 tunnel outputs; 8 electric amplifiers can be supported in each light station, and promptly a light station input electrical signal can connect 8 electric amplifiers; An electric amplifier has the output of 4 road signals of telecommunication.Annotate: followingly all compare with the calculation of capacity of same hypothesis.Ratio in the real network can be different.
If the insertion point of IPQAM signal is placed on 201 ends, the coverage face maximum of IPQAM then, its IPQAM signal can cover whole cable TV HFC net; But the number of users as the program request support is minimum, can only support 1536 user's request programs in the whole cable TV network;
If the insertion point of IPQAM signal is placed on 203 ends, then IPQAM can support 32 * 1536 user's request programs.
If the insertion point of IPQAM signal is placed on 205 ends, then IPQAM can support 32 * 32 * 1536 user's request programs.
If the insertion point of IPQAM signal is placed on 207 ends, then IPQAM can support 8 * 32 * 32 * 1536 user's request programs.
If the insertion point of IPQAM signal is placed on 208 ends, then IPQAM can support 4 * 8 * 32 * 32 * 1536 user's request programs.
Therefore when two-way some broadcasting user is few, IPQAM equipment can be placed on the place near front end, Tou Zi equipment is few like this, and cost is low; Continuous increase along with the program request number of users, the position of IPQAM insertion point constantly moves down, and so just can guarantee that more user can realize the two-way television program request, along with constantly moving down of IPQAM insertion point, can satisfy cable TV network user's program request demand, satisfy the needs of the following integration of three networks.
Preferred embodiment 4:
As shown in Figure 3, be the signal flow schematic diagram; 301 are the Broadcast Control platform, 302 is EPON, the OLT of GPON or wavelength-division PON, 303 is EPON, the upward signal of GPON or wavelength-division PON, 304 is EPON, the downstream signal of GPON or wavelength-division PON, 305 is EPON, the ONU of GPON or wavelength-division PON, 306 is coaxial cable Ethernet local side apparatus, 307 is coaxial cable, 308 hold equipment for the coaxial cable ethernet user, 309 lines of holding the two-way planter top box of equipment and user to be connected for the coaxial cable ethernet user, 311 is two-way planter top box, 310 is IPQAM equipment, and 312 is the insertion holding wire of IPQAM, and 313 is the fiber optic cables or the coaxial cable of HFC CATV transmission, 314 is frequency mixer, and 315 is the Internet net.
301 are the Broadcast Control platform, and this platform is realized the broadcast of cable tv broadcast signal, and the broadcast of IPQAM program request signal is to the decoding of IPQAM request program; 302 is the OLT of EPON, GPON or wavelength-division PON, and the OLT upper end directly links to each other with the Broadcast Control platform by Ethernet, and the lower end is connected to a plurality of ONU by optical splitter; 303 is the upward signal of EPON, GPON or wavelength-division PON, transmits up ethernet signal, and upward signal comprises, the up Ethernet data of (1) the Internet, the signaling-information of (2) bi-directional digital television program request; 304 is the downstream signal of EPON, GPON or wavelength-division PON, is (1) the Internet downstream signal, the downlink signaling signal of (2) bi-directional digital television program request, (3) IPQAM video on demand video program stream signal; 305 is the ONU of EPON, GPON or wavelength-division PON, up OLT with EPON, GPON or wavelength-division PON is connected by optical splitter, (1) ethernet signal: be connected with the local side apparatus of ethernet device, the transport of internet signal, (2) signaling-information of transmission two-way television program request, the vision signal of the program request of (3) descending one-way transmission IPQAM; 306 is coaxial cable Ethernet local side apparatus, and one section ONU Ethernet interface with EPON, GPON or wavelength-division PON is connected, and the other end is logical to be connected with ethernet user's end equipment; 307 is coaxial cable, by modulation system transmission ethernet signal; 308 for the coaxial cable ethernet user holds equipment, and the upper end connects the Ethernet local side apparatus, and the lower end is connected with set-top box or computer by Ethernet; 309 lines of holding the two-way planter top box of equipment and user to be connected for the coaxial cable ethernet user; 311 is two-way planter top box, and the broadcast singal of (1) set-top box is sent here by 314, and (2) are sent here by 308 the signaling of bi-directional set-top box, and (3) are sent here by 308 Ethernets the two-way video signal of IPQAM; 310 is IPQAM equipment, is the video-on-demand signals transmission equipment, and connection ONU equipment suitable for reading will be transferred to ONU by OLT from the vision signal that the program request platform is sent here, be sent to IPQAM again, is converted to radiofrequency signal by coaxial cable or Optical Fiber Transmission; 312 is the insertion holding wire of IPQAM, the radiofrequency signal of IPQAM output is sent to frequency mixer carries out mixing, sends set-top box to by optical fiber or coaxial cable after the mixing; 313 is the fiber optic cables or the coaxial cable of HFC CATV transmission;
314 is frequency mixer, and frequency mixer is suitable for reading two kinds of signals: the video-on-demand signals that (1) IPQAM sends here, the broadcast video signal that (2) Broadcast Control platform is sent here; The method of mixing has two kinds: (1) electricity mixes, and (2) light mixes; Adopt electric mixed method to carry out for coaxial cable, adopt light to mix for optical fiber.Electricity mixes the employing filter, adds the distributor circuit and realizes; Light mixes the optical fiber that adopts similar optical splitter to be realized.
Preferred embodiment 5:
The transmission of the program request signal of IPQAM: after broadcast control system received the program request signaling that the user sends, after system verification was legal users, video stream data was sent to corresponding IPQAM equipment; The path of transmission is that the video stream data of VOD system is sent to the broadcasting and TV front end core network device that needs transmission through core net; The nucleus equipment of broadcasting and TV front end sends data to the OLT equipment of EPON, GPON or wavelength-division PON again, and wavelength-division is by the HFC fiber optic network; Or by the other optical fiber of HFC; Be sent to the ONU end of EPON, GPON or wavelength-division PON; The Ethernet interface of corresponding ONU end sends the data of program request to IPQAM equipment, and the IPQAM device translates is that vision signal is used for the legal users set-top box.
Transmission path adopts IP map addresses technology to realize: its implementation is, each subscriber computer top box is according to being inserted in CA card in the set-top box, produce one ID number; Be stored in for this ID number in the Broadcast Control database of broadcasting centre, and store the program request authority of respective user; When user's set-top box sends the program request signaling to broadcast control system, ID number of producing according to the CA card of broadcast control system, and user's request program number sends broadcast control system to; After broadcast control system is verified as validated user, the IP address of the IPQAM of the correspondence of inquiring user, the video flowing of correspondence is sent to the IPQAM equipment of respective user set-top box by the IP bag, IPQAM equipment is according to ID number of the subscriber computer top box, the network video stream data are converted to the radio frequency flow data of IPQAM, and the descending control flows by IPQAM sends frequency and corresponding video stream number to the subscriber computer top box, set-top box is according to rf frequency and video stream number, video flowing to correspondence is decoded, the Display Realization video request program.
Though in conjunction with the accompanying drawings embodiments of the present invention are described, those of ordinary skills can make various distortion or modification within the scope of the appended claims.
Claims (8)
1. the bi-directional digital television program request implement device of a PON, IPQAM structure comprises: central machine room; Headend room; The HFC fiber optic network; HFC light station; The OLT of EPON, GPON or wavelength-division PON; The ONU of EPON, GPON or wavelength-division PON; IPQAM equipment; Coaxial cable net in the hfc plant; User's STB terminal; Its feature comprises:
Described 101 is GuangDian Center's machine room, and 102 is the broadcasting and TV headend room, and 103 is the HFC fiber optic network, and 104 is HFC light station, and 105 is the ONU of EPON or GPON, and 106 is IPQAM equipment, and 108 is the coaxial cable net in the hfc plant; 107 is the STB terminal user; 109 is the STB terminal user;
101 is GuangDian Center's machine room, in broadcast control system is arranged; Broadcast control system comprises: (1) audio frequency, video program source storage system, (2) program request control appliance, (3) live telecast signal; Link together by studio equipment, realize live telecast, the program request of two-way television; Central machine room has a circuit to connect the Internet in addition, and the Internet of GuangDian Center's machine room is connected with the broadcasting and TV sub-headend by core net, realizes the broadband access network of CHINA RFTCOM Co Ltd;
102 is the broadcasting and TV headend room, suitable for readingly is connected with central machine room by core net, and end opening is connected with sub-district machine room or light station; The OLT that EPON, GPON or wavelength-division PON are arranged in the headend room, the signaling-information that order video signal that core net is transmitted from central machine room or user side are communicated by letter with broadcasting centre, transmit EPON, the GPON at light station or the ONU of wavelength-division PON by optical fiber, the signaling-information and the internet data of broadcast television signal, two-way program request is transferred to light station or amplifier;
103 is the HFC fiber optic network, the broadcast singal of transmission radio and television, and the signal of the descending transmission of HFC has the broadcast singal in a plurality of live radio station and the television broadcasting signal that broadcasting centre is broadcast, and both anolog TV signals can be arranged, and also digital television signal can be arranged; Realize the transmission of EPON, GPON or wavelength-division PON signal simultaneously by wavelength division multiplexing or different optical fiber, realize the following biography of order video signal, the signaling-information transmission of two-way program request and internet data transmission;
104 is HFC light station, will be modulated to the signal of telecommunication of radio and television by the analog TV broadcasting light signal that Optical Fiber Transmission is come, and is transferred to each user by the coaxial cable net;
105 is the ONU of EPON, GPON or wavelength-division PON, and with the data-signal that OLT sends, the video data of (1) program request sends IPQAM equipment to; (2) wideband data sends the Ethernet local side apparatus at HFC light station to, and refile holds equipment for user's ethernet user; (3) signaling of the two-way planter top box of user being seen through PON equipment and equipment of the core network and broadcasting centre communicates;
106 is IPQAM equipment, and audio frequency, video data stream that the ONU of EPON, GPON or wavelength-division PON signal is sent here are modulated to vision signal, broadcast in the correspondent frequency scope;
108 is the coaxial cable net in the hfc plant, the broadcast singal transmission tone video broadcast signal of (1) transmission radio and television; (2) vision signal of transmission VOD system; (3) the transmission ethernet signal comprises: the two-way ethernet communication data of the two-way signaling of program request and the Internet;
107,109 is the STB terminal user, and set-top box is responsible for the decoding of broadcast television signal and the decoding of IPQAM broadcast television signal, and sound, video data stream are converted to image, sound.
2. according to claim 1, the bi-directional digital television program request implement device of described a kind of PON, IPQAM structure, the position that described IPQAM places is characterized in that:
The IPQAM signaling-information is transmitted by duplex channel, and two-way channel can solve by the scheme of DOCSIS or the scheme of EoC; The channel of internet transmission.
3. according to claim 1, the bi-directional digital television program request implement device of described a kind of PON, IPQAM structure, described EPON's, it is characterized in that:
IPQAM by central machine room or headend room, is moved on to sub-district or light station; Thereby realized the multiplexing of coaxial cable frequency resource, thoroughly solved the problem of coaxial cable net frequency resource deficiency; The program request signal of its IPQAM is sent to headend room by the core net central machine room, delivers to IPQAM equipment by EPON or GPON by headend room again; After being modulated into radiofrequency signal by IPQAM, send to the coaxial cable net, play for set-top box.
4. according to claim 1, the bi-directional digital television program request implement device of described a kind of PON, IPQAM structure, described EPON's, it is characterized in that:
201 is broadcasting centre, and 202 is the broadcasting centre optical splitter, and 203 is image intensifer, and 204 is the sub-headend optical splitter, and 205 is image intensifer, and 206 is the light station, and 207 is amplifier, 208,209,210,211 4 road signal of telecommunication branch roads for electric amplifier output;
The TV signal of each channel of the broadcast of 201 broadcasting centres comprises anolog TV signals and through QAM modulated digital TV signal, is converted to the optical fiber that light signal send 201 broadcasting centres through electric light; 202 is the broadcasting centre optical splitter, signal in the optical fiber is divided into several delivers to each sub-headend; 203 is the sub-headend image intensifer, and the signal of importing is amplified; 204 is the sub-headend optical splitter, signal is divided into the several signal after, deliver to each light station; 205 is image intensifer, send 206 after 204 signals of sending here are amplified; 206 is the light station, exports after the light signal of sending here is converted to the signal of telecommunication, and the signal of telecommunication of output can directly connect the user, also can deliver to electric amplifier 207 and signal is amplified the back connect the user; 207 is amplifier, and the signal that the light station is sent here amplifies back connection user; 208 first branch roads for electric amplifier output;
When two-way some broadcasting user is few, IPQAM equipment can be placed on place near front end, Tou Zi equipment is few like this, and cost is low; Continuous increase along with the program request number of users, the position of IPQAM insertion point constantly moves down, and so just can guarantee that more user can realize the two-way television program request, along with constantly moving down of IPQAM insertion point, can satisfy cable TV network user's program request demand, satisfy the needs of the following integration of three networks.
5. according to claim 1, the bi-directional digital television program request implement device of described a kind of PON, IPQAM structure, described EPON's, it is characterized in that:
301 are the Broadcast Control platform, 302 is the OLT of EPON or GPON, 303 is the upward signal of EPON or GPON, 304 is the downstream signal of EPON or GPON, 305 is the ONU of EPON or GPON, 306 is coaxial cable Ethernet local side apparatus, 307 is coaxial cable, and 308 for the coaxial cable ethernet user holds equipment, 309 lines of holding the two-way planter top box of equipment and user to be connected for the coaxial cable ethernet user, 311 is two-way planter top box, 310 is IPQAM equipment, and 312 is the insertion holding wire of IPQAM, and 313 is the fiber optic cables or the coaxial cable of HFC CATV transmission, 314 is frequency mixer, and 315 is the Internet net.
301 are the Broadcast Control platform, and this platform is realized the broadcast of cable tv broadcast signal, and the broadcast of IPQAM program request signal is to the decoding of IPQAM request program; 302 is the OLT of EPON or GPON, and the OLT upper end directly links to each other with the Broadcast Control platform by Ethernet, and the lower end is connected to a plurality of ONU by optical splitter; 303 is the upward signal of EPON or GPON, transmits up ethernet signal, and upward signal comprises, the up Ethernet data of (1) the Internet, the signaling-information of (2) bi-directional digital television program request; 304 is the downstream signal of EPON or GPON, is (1) the Internet downstream signal, the downlink signaling signal of (2) bi-directional digital television program request, (3) I PQAM video on demand video program stream signal; 305 is the ONU of EPON or GPON, up OLT with EPON or GPON is connected by optical splitter, (1) ethernet signal: be connected with the local side apparatus of ethernet device, the transport of internet signal, (2) signaling-information of transmission two-way television program request, the vision signal of the program request of (3) descending one-way transmission IPQAM; 306 is coaxial cable Ethernet local side apparatus, and one section is connected with the ONU Ethernet interface of EPON or GPON, and the other end is logical to be connected with ethernet user's end equipment; 307 is coaxial cable, by modulation system transmission ethernet signal; 308 for the coaxial cable ethernet user holds equipment, and the upper end connects the Ethernet local side apparatus, and the lower end is connected with set-top box or computer by Ethernet; 309 lines of holding the two-way planter top box of equipment and user to be connected for the coaxial cable ethernet user; 311 is two-way planter top box, and the broadcast singal of (1) set-top box is sent here by 314, and (2) are sent here by 308 the signaling of bi-directional set-top box, and (3) are sent here by 308 Ethernets the two-way video signal of IPQAM; 310 is IPQAM equipment, is the video-on-demand signals transmission equipment, and connection ONU equipment suitable for reading will be transferred to ONU by OLT from the vision signal that the program request platform is sent here, be sent to IPQAM again, is converted to radiofrequency signal by coaxial cable or Optical Fiber Transmission; 312 is the insertion holding wire of IPQAM, the radiofrequency signal of IPQAM output is sent to frequency mixer carries out mixing, sends set-top box to by optical fiber or coaxial cable after the mixing; 313 is the fiber optic cables or the coaxial cable of HFC CATV transmission.
6. according to claim 1, the bi-directional digital television program request implement device of described a kind of PON, IPQAM structure, described EPON's, it is characterized in that:
314 is frequency mixer, and frequency mixer is suitable for reading two kinds of signals: the video-on-demand signals that (1) IPQAM sends here, the broadcast video signal that (2) Broadcast Control platform is sent here; The method of mixing has two kinds: (1) electricity mixes, and (2) light mixes; Adopt electric mixed method to carry out for coaxial cable, adopt light to mix for optical fiber.Electricity mixes the employing filter, adds the distributor circuit and realizes; Light mixes the optical fiber that adopts similar optical splitter to be realized.
7. according to claim 1, the bi-directional digital television program request implement device of described a kind of PON, IPQAM structure, described EPON's, it is characterized in that:
The transmission of the program request signal of IPQAM: after broadcast control system received the program request signaling that the user sends, after system verification was legal users, data were sent to corresponding IPQAM equipment; The path of transmission is that the video stream data of VOD system is sent to the broadcasting and TV front end core network device that needs transmission through core net; The nucleus equipment of broadcasting and TV front end sends data to the OLT equipment of EPON, GPON or wavelength-division PON again, and wavelength-division is by the HFC fiber optic network; Or by the other optical fiber of HFC; Be sent to the ONU end of EPON, GPON or wavelength-division PON; The Ethernet interface of corresponding ONU end sends the data of program request to IPQAM equipment, and the IPQAM device translates is that vision signal is used for the legal users set-top box.
8. according to claim 1, the bi-directional digital television program request implement device of described a kind of PON, IPQAM structure, described EPON's, it is characterized in that:
Transmission path adopts IP map addresses technology to realize: its implementation is, each subscriber computer top box is according to being inserted in CA card in the set-top box, produce one ID number; Be stored in for this ID number in the Broadcast Control database of broadcasting centre, and store the program request authority of respective user; When user's set-top box sends the program request signaling to broadcast control system, ID number of producing according to the CA card of broadcast control system, and user's request program number sends broadcast control system to; After broadcast control system is verified as validated user, the IP address of the IPQAM of the correspondence of inquiring user, the video flowing of correspondence is sent to the IPQAM equipment of respective user set-top box by the IP bag, IPQAM equipment is according to ID number of the subscriber computer top box, the network video stream data are converted to the radio frequency flow data of IPQAM, and the descending control flows by IPQAM sends frequency and corresponding video stream number to the subscriber computer top box, set-top box is according to rf frequency and video stream number, video flowing to correspondence is decoded, the Display Realization video request program.
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| CN115190323A (en) * | 2022-06-28 | 2022-10-14 | 北京金盘鹏图软件技术有限公司 | Content broadcasting control system based on Internet |
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Application publication date: 20110511 |