CN102883151A - Plastic optical fiber user access network equipment and plastic optical fiber user access network system for broadcast network - Google Patents
Plastic optical fiber user access network equipment and plastic optical fiber user access network system for broadcast network Download PDFInfo
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Abstract
The invention provides plastic optical fiber user access network equipment and a plastic optical fiber user access network system of the broadcast network. The plastic optical fiber user access network system comprises a plastic optical fiber optical network unit (POFONU), a data terminal unit (DTU) or a television (TV), and plastic optical fiber user access central equipment (POF Home Center) or a digital set top box (STB). By utilizing a coaxial cable to be as transmission of the user access network of the broadcast network, replacing the STB by the plastic optical fiber user access center equipment (POF Home Center) and adding one plastic optical fiber, fiber-to-the-home can be realized, and on the basis, modification of broadband and bi-directionality of an existing broadcast access network can be completed.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of plastic fiber user access networks equipment and system of broadcasting and television network.
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Background technology
China's cable television network has nearly 1.5 hundred million families of user, because Economic Development Status in all parts of the country is extremely uneven, adds other history and odjective cause, and there is very big-difference in various places wired broadcasting TV network, and most of users' network remains unilateral network.Along with the active demand of business development and the integration of three networks, radio and television Access Network quality and bearing capacity to be had higher requirement, the radio and television Access Network must carry out digitlization and Two-way transformation.
At present domesticly have multiple Bidirectional Access Technologies 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 large, and the bandwidth that provides and the business of support are also different, lacks standard criterion.
On the one hand, the appearance of numerous technical schemes has reflected the demand in market, to the operator space that provides more choices; Numerous schemes has also been brought difficulty to decision-making on the other hand.From technical standpoint, each technical scheme all has its limitation separately.Such as from working band, the existing cable access technology works in outside the frequency range of current broadcast television operations permission mostly, and some is operated in the low-frequency range that is lower than 65MHz, and some is then for being higher than the high band of 860MHz.Interference and noise are larger in the low-frequency range channel, and channel is also comparatively crowded; And signal attenuation and reflection are comparatively serious in the high band channel, might greatly affect the performance of system or reduce the applicability of this technology.From channel width, the channel width that some technology is selected is not the integral multiple of 8MHz, does not meet the channel width planning requirement of China's radio and television Access Network, is unfavorable for the reasonable distribution of channel and effectively utilization.From protocol capabilities, the service rate that some technology provides can not satisfy the bandwidth needs of current and following one section business development in period, some technology does not well solve service quality (QoS) security problem, can not provide the required QoS such as the miscellaneous service that comprises real time flow medium.
Summary of the invention
The object of the present invention is to provide a kind of plastic fiber user of broadcasting and television network to access central apparatus and system, purport can be finished broadband, the Two-way transformation of existing radio and television Access Network on this basis.
The embodiment of the invention is to realize like this, a kind of plastic fiber user access networks system of broadcasting and television network, described system comprise that plastic fiber optical network unit, user terminal or digital television and plastic fiber user access central apparatus or digital TV set-top box;
The radio and television Access Network connects plastics fiber optic network unit by silica fiber or plastic fiber, and the plastic fiber optical network unit is used for providing various broadband services to the user who links to each other;
The radio and television Access Network passes through coaxial cable, connect plastics Optical-fiber subscriber access central apparatus or digital TV set-top box, the plastic fiber optical network unit is also by the diverse network transmission medium, connect plastics Optical-fiber subscriber access central apparatus or digital TV set-top box, the plastic fiber user accesses the exchange that central apparatus or digital TV set-top box are used for realizing household internal information and family's external information;
The plastic fiber user accesses central apparatus by various transmission mediums, links to each other with user terminal or digital television, and user terminal or digital television are for contact to realize the diverse network application with the end user.
Another purpose of the embodiment of the invention is to provide a kind of plastic fiber user access networks system of broadcasting and television network, and described system comprises that the plastic fiber user accesses central apparatus, user terminal or digital television;
The radio and television Access Network passes through coaxial cable, connect plastics Optical-fiber subscriber access central apparatus, and the radio and television Access Network passes through plastic fiber, directly connect plastics Optical-fiber subscriber access central apparatus, the plastic fiber user accesses the exchange that central apparatus is used for realizing household internal information and family's external information;
The plastic fiber user accesses central apparatus by various transmission mediums, links to each other with user terminal or digital television, and user terminal or digital television are for contact to realize the diverse network application with the end user.
Another purpose of the embodiment of the invention is to provide a kind of plastic fiber user of broadcasting and television network to access central apparatus, include the RF interface, the plastic fiber optical-electrical converter, the gateway chip, the multimedia process chip, video and tone frequency channel wire interface, conversion chip, the RJ45 interface, RJ11 interface and other interfaces, wherein the RF interface is connected with the plastic fiber optical-electrical converter and is connected with the gateway chip, the gateway chip is connected with the multimedia process chip, the multimedia process chip is connected with the tone frequency channel wire interface with video, in addition, conversion chip, the RJ45 interface all is connected with the gateway chip with other interfaces, and the RJ11 interface is connected with conversion chip.
Another purpose of the embodiment of the invention is to provide a kind of plastic fiber user of broadcasting and television network to access central apparatus, include the RF interface, the plastic fiber optical-electrical converter, the ONU chip, the gateway chip, the multimedia process chip, video and tone frequency channel wire interface, conversion chip, the RJ45 interface, RJ11 interface and other interfaces, wherein the RF interface is connected with the ONU chip and is connected with the gateway chip, the plastic fiber optical-electrical converter is connected with the ONU chip, the gateway chip is connected with the multimedia process chip, the multimedia process chip is connected with the tone frequency channel wire interface with video, in addition, conversion chip, the RJ45 interface all is connected with the gateway chip with other interfaces, and the RJ11 interface is connected with conversion chip.
Another purpose of the embodiment of the invention is to provide a kind of plastic fiber user of broadcasting and television network to access central apparatus, include the RF interface, the plastic fiber optical-electrical converter, embedded type CPU, the multimedia process chip, video and tone frequency channel wire interface, conversion chip, the RJ45 interface, RJ11 interface and other interfaces, wherein the RF interface is connected with the plastic fiber optical-electrical converter and is connected with embedded type CPU, embedded type CPU is connected with the multimedia process chip, the multimedia process chip is connected with the tone frequency channel wire interface with video, in addition, conversion chip, the RJ45 interface all is connected with embedded type CPU with other interfaces, and the RJ11 interface is connected with conversion chip.
The present invention can be with coaxial cable as user access network, and its transmission course is constant, and adds a plastic fiber and access to realize fiber entering household, and can finish on this basis broadband, the Two-way transformation of existing radio and television Access Network.
Description of drawings
Fig. 1 is existing radio and television Access Network Organization Chart.
Fig. 2 is the plastic fiber user access networks Organization Chart of the first broadcasting and television network.
Fig. 3 is the plastic fiber user access networks Organization Chart of the second broadcasting and television network.
Fig. 4 is the structured flowchart of plastic fiber optical network unit of the present invention.
Fig. 5 is the structured flowchart of the first plastics home gateway in the plastic fiber user access networks of the first broadcasting and television network.
Fig. 6 is the structured flowchart of the second plastics home gateway in the plastic fiber user access networks of the second broadcasting and television network.
Fig. 7 is the structured flowchart of the third plastics home gateway in the plastic fiber user access networks of the second broadcasting and television network.
Fig. 8 is the structured flowchart of the EPON access module circuit of the third plastics home gateway in the plastic fiber user access networks of the second broadcasting and television network.
Embodiment
" integration of three networks " is the informationalized strategic plan of national development, is the inexorable trend of development communication technologies.Explicitly point out in " national economy and social development 11th Five-Year Plan outline ": strengthen the information infrastructure buildings such as broadband communication network, Digital Television (DTV) net and Next Generation Internet, advance the integration of three networks, perfect Information Security System.Accelerating The Construction a new generation cable digital TV (DTV) network is not only cable network self upgrading, is realized the domestic demand of sustainable development, advances especially the inevitable requirement of national information, the promotion integration of three networks.
Cable television network is the important basis for IT application facility of country, the advantage of the aspect such as have that business tine is abundant, content is controlledly managed, the user group is huge, can satisfy the demand of " integration of three networks " business development, meet the broadband services development trend of taking as the leading factor with video.Therefore, in " integration of three networks ", rely on more the radio and television Access Network, give full play to the advantage of CHINA RFTCOM Co Ltd, it is the selection that meets China's actual conditions, proceeds from the reality, with short time, lower cost, Digital Divide realizes entering huge numbers of families' informationization and the informationalized effective way of safety.
On November 4th, 2008, the Department of Science and Technology and SARFT's official signature " national high performance wide-band-message net and Chinese Next generation broadcasting network autonomous innovation cooperation agreement book ", according to protocol requirement, General Bureau of Radio, Film and Television takes up to build Next generation broadcasting network network (NGB).One of key technology of Next generation broadcasting network (NGB) is exactly to utilize the radio and television Access Network to carry out broadband, Two-way transformation, make the cable television network network surmount other existing networks, become one of important component part of national information infrastructure, performance cable television network bandwidth, cost advantage low, that easily popularize, the multimedia messages that cable digital TV (DTV) is become enter huge numbers of families is flat to be closed, satisfy many-sided demand of various circles of society and numerous residents, advance the integration of three networks.
China's cable television network has nearly 1.5 hundred million families of user, because Economic Development Status in all parts of the country is extremely uneven, adds other history and odjective cause, and there is very big-difference in various places wired broadcasting TV network, and most of users' network remains unilateral network.Along with the active demand of business development and the integration of three networks, radio and television Access Network quality and bearing capacity to be had higher requirement, the radio and television Access Network must carry out digitlization and Two-way transformation.
Along with the development of the communication technology, " light entering and copper back " becomes trend gradually.Investigation shows, in China's radio and television Access Network, it is that the following user in 200 families has accounted for more than 15.5% of total number of users that optical node covers number of users a few days ago.According to domestic and international trend of network development, Next generation broadcasting network (NGB) faced the future 5 years to 10 years, and optical node covers and develops in 200 families or 50 families, even the deployment of large-scale F TTH.On the mode of the network rebuilding, at present domesticly have multiple Bidirectional Access Technologies 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 large, and the bandwidth that provides and the business of support are also different, lacks standard criterion.
On the one hand, the appearance of numerous technical schemes has reflected the demand in market, to the operator space that provides more choices; Numerous schemes has also been brought difficulty to decision-making on the other hand.From technical standpoint, each technical scheme all has its limitation separately.Such as from working band, the existing cable access technology works in outside the frequency range of current broadcast television operations permission mostly, and some is operated in the low-frequency range that is lower than 65MHz, and some is then for being higher than the high band of 860MHz.Interference and noise are larger in the low-frequency range channel, and channel is also comparatively crowded; And signal attenuation and reflection are comparatively serious in the high band channel, might greatly affect the performance of system or reduce the applicability of this technology.From channel width, the channel width that some technology is selected is not the integral multiple of 8MHz, does not meet the channel width planning requirement of China's radio and television Access Network, is unfavorable for the reasonable distribution of channel and effectively utilization.From protocol capabilities, the service rate that some technology provides can not satisfy the bandwidth needs of current and following one section business development in period, some technology does not well solve service quality (QoS) security problem, can not provide the required QoS such as the miscellaneous service that comprises real time flow medium.
In addition, from the cost angle, owing to lack unified standard, various schemes all are difficult to form scale effect, cause the effect of Two-way transformation to differ and the cost difficulty, thereby are difficult to large-scale promotion.
Existing radio and television Access Network is the optical cable-coaxial cable hybrid network (HFC) take optical fiber as main line, and radio and television Access Network Two-way renovation technique comprises that mainly Access Network light transmission renovation technique and user access renovation technique two parts.
Aspect light transmission transformation, compare active optical network (AON) technology, EPON (PON) technology has that topological structure is simple, equipment cost is low, and the topological structure of the fiber section of its network topology structure and HFC net is similar, therefore in existing hfc plant, adopt the PON technology, do not need existing hfc plant is significantly transformed, only need to do simple configuration at original optical-fiber network, but finish the upgrading of network within a short period of time.
Access aspect the renovation technique the user, the present invention then adopts the plastic fiber system to carry out broadband access, below in conjunction with accompanying drawing technical solution of the present invention is elaborated.
Its structure of existing broadcasting and television network as shown in Figure 1, the radio and television Access Network is connected with digital TV set-top box (STB) by coaxial cable, then digital TV set-top box (STB) is connected with Digital Television (DTV) or user terminal (DTU).
And as shown in Figure 2, the plastic fiber user access networks system of a kind of broadcasting and television network of the present invention makes up Access Network take plastic fiber as transmission medium, carries out the user access networks transformation.This system comprises that plastic fiber optical network unit (POF ONU), user terminal (DTU) or television set (TV) and plastic fiber user access central apparatus (POF Home Center) or digital TV set-top box (STB);
Existing wired broadcasting TV Access Network is the optical cable-coaxial cable hybrid network (HFC) take optical fiber as main line, generally access silica fiber optical line terminal (OLT) with silica fiber as backbone network, the up access of mainly finishing the PON network with link to each other with silica fiber network element (ONU) equipment with silica fiber optical distribution network (ODN) (optical fiber and passive optical splitters form) by the PON mouth, the PON mouth of general silica fiber optical line terminal (OLT) links to each other with silica fiber optical distribution network (ODN) net by simple optical fiber, the descending employing broadcast mode of silica fiber network element (ONU), silica fiber network element (ONU) equipment selectivity receives.Silica fiber network element (ONU) equipment is by coaxial cable junctor top box (STB), set-top box (STB) connects user terminal (DTU) or television set (TV) (such as television set, PC etc.) by video/audio connecting line (generally usefulness is the AV line, and what high clear was used is HDMI line or color difference components line) again.Set-top box (STB) is used for strengthening or the expansion functions of television set, can receive the program that passes over by cable, and Additional Services can be provided.
The signals transmission of existing wired broadcasting TV Access Network is: described silica fiber optical signal source is transferred to silica fiber network element (ONU) in silica fiber optical line terminal (OLT) and optical distribution network (ODN), and the signal of transmission all is the silica fiber light signal therebetween; Then by coaxial cable junctor top box (STB), signal is converted to the silica fiber optical-electrical converter signal of telecommunication, the coaxial cable signal of telecommunication from the silica fiber light signal to silica fiber network element (ONU) successively again; By set-top box (STB) indirect joint user terminal (DTU) or television set (TV), the coaxial cable signal of telecommunication converts the video/audio signal of telecommunication to the coaxial cable signal of telecommunication again.Vice versa.
In addition, the radio and television Access Network can also be the radiated television Access Network, it is transferred to wireless television signal receiving equipment (such as satellite antenna) by parts such as broadcast and TV radiating station, relay station, transposer station, receipts turntable (station), microwave station, program transfer station (station), broadcast satellite, satellite earth station, monitor stations (station) with wireless television signal.The wireless television signal receiving equipment is again by coaxial cable junctor top box (STB), set-top box (STB) connects user terminal (DTU) or television set (TV) (such as television set, PC etc.) by video/audio connecting line (generally usefulness is the AV line, and what high clear was used is HDMI line or color difference components line) again.Set-top box (STB) is used for strengthening or the expansion functions of television set, can receive the program that passes over by cable, and Additional Services can be provided.
The signals transmission of existing radiated television Access Network is: the radiovision signal of telecommunication is converted to the coaxial cable signal of telecommunication after being received by the wireless television signal receiving equipment; By set-top box (STB) indirect joint user terminal (DTU) or television set (TV), the coaxial cable signal of telecommunication converts the video/audio signal of telecommunication to the coaxial cable signal of telecommunication again.Vice versa.
The radio and television Access Network connects plastics fiber optic network unit (POF ONU) by silica fiber or plastic fiber, and plastic fiber optical network unit (POF ONU) is used for providing various broadband services to the user who links to each other;
The radio and television Access Network connects plastics Optical-fiber subscriber access central apparatus (POF Home Center) by coaxial cable, plastic fiber optical network unit (POF ONU) also connects plastics Optical-fiber subscriber access central apparatus (POF Home Center) or digital TV set-top box by the diverse network transmission medium, and the plastic fiber user accesses the exchange that central apparatus (POF Home Center) or digital TV set-top box (STB) are used for realizing household internal information and family's external information.
When the radio and television Access Network connected plastics fiber optic network unit (POF ONU) by plastic fiber, plastic fiber optical network unit (POF ONU) connected plastics Optical-fiber subscriber access central apparatus (POF Home Center) or digital TV set-top box by the diverse network transmission medium.Diverse network transmission medium described here includes but not limited to the transmission mediums such as coaxial cable, twisted-pair feeder, plastic fiber, silica fiber, WIFI.But when the radio and television Access Network connected plastics fiber optic network unit (POF ONU) by silica fiber, plastic fiber optical network unit (POF ONU) connected plastics Optical-fiber subscriber access central apparatus (POF Home Center) or digital TV set-top box by plastic fiber.
Digital TV set-top box (STB) links to each other with user terminal (DTU) or television set (TV) by the video/audio connecting line, and user terminal (DTU) or television set (TV) are for contact to realize the diverse network application with the end user.
The plastic fiber user accesses central apparatus (POF Home Center) by various transmission mediums, link to each other with user terminal (DTU) or television set (TV), user terminal (DTU) or television set (TV) are for contact to realize the diverse network application with the end user.Here each various transmission medium includes but not limited to the transmission mediums such as video/audio connecting line, coaxial cable, twisted-pair feeder, plastic fiber, silica fiber, WIFI.
This system and existing radio and television access net system are similar, and in the simplest situation, the radio and television Access Network is connected with digital TV set-top box by coaxial cable; Described plastic fiber optical network unit (POF ONU) first line of a couplet has the radio and television Access Network now, and between plastic fiber optical network unit (POF ONU) and digital TV set-top box, lay the diverse network transmission medium and be connected, for example now a lot of digital TV set-top box have the RJ45 interface, then can be connected with twisted-pair feeder by between, only add a plastic fiber optical network unit and plastic fiber connecting line, just realized bidirectional rebuilding and the fiber entering household of radio and television Access Network.
In complicated any situation, digital TV set-top box is replaced by the plastic fiber user again and accesses central apparatus (POF Home Center), the function that then can realize is more powerful.
Signals transmission of the present invention is:
Connect in the situation of plastics fiber optic network unit by silica fiber at the radio and television Access Network, the silica fiber optical signal source is in the radio and television Access Network, be connected to the plastic fiber optical network unit by silica fiber again, then transmit with the silica fiber light signal in the silica fiber, after the silica fiber light signal arrived the plastic fiber optical network unit, the silica fiber light signal was converted to the silica fiber optical-electrical converter signal of telecommunication, the plastic fiber optical-electrical converter signal of telecommunication, plastic fiber light signal successively; Then by described plastic fiber, the plastic fiber optical signal transmission is accessed central apparatus to the plastic fiber user, the plastic fiber user accesses central apparatus the plastic fiber light signal is converted into the plastic fiber optical-electrical converter signal of telecommunication, be converted into again the video/audio signal of telecommunication, be transferred to user terminal or digital television;
Vice versa;
Connect by plastic fiber in plastics fiber optic network unit and the plastic fiber optical network unit situation by plastic fiber connection plastics Optical-fiber subscriber access central apparatus at the radio and television Access Network, the plastic fiber optical signal source is in the radio and television Access Network, pass through again plastic fiber, the plastic fiber optical signal transmission is arrived the plastic fiber optical network unit, pass through again plastic fiber, the plastic fiber optical signal transmission is accessed central apparatus to the plastic fiber user, the plastic fiber user accesses central apparatus the plastic fiber light signal is converted into the plastic fiber optical-electrical converter signal of telecommunication, be converted into again the video/audio signal of telecommunication, be transferred to user terminal or digital television;
Vice versa;
Connect by plastic fiber at the radio and television Access Network in the situation of plastics fiber optic network unit and plastic fiber optical network unit non-plastic fiber transmission medium connection digital TV set-top box by other, the plastic fiber optical signal source is in the radio and television Access Network, pass through again plastic fiber, the plastic fiber optical signal transmission is arrived the plastic fiber optical network unit, the plastic fiber optical network unit is converted into the plastic fiber optical-electrical converter signal of telecommunication with the plastic fiber light signal, and convert the plastic fiber optical-electrical converter signal of telecommunication to other transmission medium signal of telecommunication, digital TV set-top box converts other transmission medium signals of telecommunication to the video/audio signal of telecommunication again, is transferred to user terminal or digital television;
Vice versa;
And the existing signals transmission of radio and television Access Network in the plastic fiber user access networks system of this broadcasting and television network is constant.
Because original transmission medium of existing radio and television Access Network is all kept, and has protected greatly the investment of the coaxial Access Network of existing radio and television Access Network.
And as shown in Figure 3, the present invention also comprises the plastic fiber user access networks system of another broadcasting and television network, makes up Access Network take plastic fiber as transmission medium, carries out the user access networks transformation.This system comprises that the plastic fiber user accesses central apparatus (POF Home Center), user terminal (DTU) or television set (TV).
The radio and television Access Network connects plastics Optical-fiber subscriber access central apparatus (POF Home Center) by coaxial cable, the radio and television Access Network also connects plastics Optical-fiber subscriber access central apparatus (POF Home Center) by plastic fiber, and the plastic fiber user accesses the exchange that central apparatus (POF Home Center) is used for realizing household internal information and family's external information.
The plastic fiber user accesses central apparatus (POF Home Center) and links to each other with user terminal (DTU) or television set (TV) by various transmission mediums, and user terminal (DTU) or television set (TV) are for contact to realize the diverse network application with the end user.
This system and existing radio and television access net system are similar, only needing to change set-top box (STB) equipment is that the plastic fiber user accesses central apparatus (POF Home Center), the radio and television Access Network accesses central apparatus (POF Home Center) by plastic fiber with the plastic fiber user and is connected, and the connection of original coaxial cable is constant; The plastic fiber user accesses central apparatus (POF Home Center) by plastic fiber first line of a couplet radio and television Access Network, and described plastic fiber user accesses central apparatus (POF Home Center) and links to each other with user terminal (DTU) or television set (TV) by various transmission mediums, realizes two-way, broadband transformation and the fiber entering household of radio and television Access Network of future generation.
Signals transmission of the present invention is: described plastic fiber optical signal source is in the radio and television Access Network, be connected to the plastic fiber user by plastic fiber optical fiber again and access central apparatus (POF Home Center), then the plastic fiber transmission is the plastic fiber light signal, then the plastic fiber user accesses central apparatus (POF Home Center) and converts the plastic fiber light signal to the video/audio signal of telecommunication, is transferred to user terminal (DTU) or television set (TV).Vice versa.
Because original transmission medium of existing radio and television Access Network is all kept, and has protected greatly the investment of the coaxial Access Network of existing radio and television Access Network.Constant as the transmission course of broadcasting and television network user access network with coaxial cable, only set-top box (STB) is replaced by the plastic fiber user and is accessed central apparatus (POF Home Center), and add a plastic fiber and access to realize fiber entering household, and can finish on this basis broadband, the Two-way transformation of existing radio and television Access Network.
The difference of the plastic fiber user access networks system of this broadcasting and television network described in Fig. 3 and the plastic fiber user access networks system of a kind of broadcasting and television network described in Fig. 2 is: the plastic fiber user in the system shown in Figure 2 is accessed central apparatus (POF Home Center) to system shown in Figure 3 and plastic fiber optical network unit (POF ONU) unites two into one; And in the system shown in Figure 2, the radio and television Access Network connects plastics fiber optic network unit (POF ONU) by silica fiber or plastic fiber, and plastic fiber optical network unit (POF ONU) connects plastics Optical-fiber subscriber access central apparatus (POF Home Center) by the diverse network transmission medium again.
The structure of plastic fiber optical network unit of the present invention (POF ONU) as shown in Figure 4, its structure includes silica fiber optical-electrical converter 21 (such as Hisense company, model is LTB34D2), ONU chip 22 is (such as Corona system house, model is CS8016), plastic fiber optical-electrical converter 23 is (such as Firecomms company, model is EDL-300T or EDL-301T), and silica fiber optical-electrical converter 21 and plastic fiber optical-electrical converter 23 respectively conducting be connected to uplink port and the downlink port place of ONU chip 22.Wherein, described ONU chip 22 internal integrations function of exchange with support 100Base-FX PHY, be mainly used in finishing the mutual conversion of the silica fiber optical-electrical converter signal of telecommunication (call not only horizontal electrical signal) and the plastic fiber optical-electrical converter signal of telecommunication (but also being the downlink electrical signal); Silica fiber optical-electrical converter 21 can be provided with silica fiber interface (not showing among the figure), is mainly used in finishing the mutual conversion of silica fiber light signal and the silica fiber optical-electrical converter signal of telecommunication; Plastic fiber optical-electrical converter 23 can be provided with plastic fiber port (not showing among the figure), is mainly used in finishing the mutual conversion of the plastic fiber optical-electrical converter signal of telecommunication and plastic fiber light signal.(also need explanation to be, the uplink port of ONU chip is used for receiving the silica fiber optical-electrical converter signal of telecommunication that silica fiber optical-electrical converter 21 sends, and downlink port is used for sending the plastic fiber optical-electrical converter signal of telecommunication of ONU chip 22 conversions.) conversion method of silica fiber light signal and plastic fiber light signal specifically may further comprise the steps:
At first, silica fiber optical-electrical converter 21 will be converted to the silica fiber optical-electrical converter signal of telecommunication by the silica fiber light signal that the silica fiber interface receives, and after be delivered to ONU chip 22;
Then, ONU chip 22 directly is converted to the PECL signal of telecommunication (being the plastic fiber optical-electrical converter signal of telecommunication) with the signal of telecommunication, and is delivered to plastic fiber optical-electrical converter 23;
At last, the light signal that plastic fiber optical-electrical converter 23 converts the PECL signal of telecommunication (being the plastic fiber optical-electrical converter signal of telecommunication) to 650nm is sent to the active information panel of plastic fiber of user side by plastic fiber with light signal, connects terminal equipment.
Otherwise, can realize that the silica fiber light signal is converted to the plastic fiber light signal.
As shown in Fig. 5:
Plastic fiber user in the plastic fiber user access networks system (as shown in Figure 2) of the first broadcasting and television network of the present invention accesses central apparatus (POF Home Center), include RF interface 31, plastic fiber optical-electrical converter 32, gateway chip 33, multimedia process chip 34, video and tone frequency channel wire interface 35, conversion chip 36, RJ45 interface 37, other interfaces 38 and RJ11 interface 39, wherein RF interface 31 is connected with the plastic fiber optical-electrical converter and all is connected with gateway chip 33, gateway chip 33 is connected with multimedia process chip 34, multimedia process chip 34 is connected with tone frequency channel wire interface 35 with video, in addition, conversion chip 36, RJ45 interface 37 all is connected with the gateway chip with other interfaces 38, and RJ11 interface 39 is connected with conversion chip 36.
Plastic fiber optical-electrical converter 32 includes plastic fiber transceiver module and the plastic fiber port (all not showing among the figure) that links to each other with the indoor plastic fiber of laying user, be mainly used in finishing the mutual conversion of the uplink and downlink signal of telecommunication and plastic fiber light signal, it is the KSZ8695X chip that gateway chip 33 can be selected model, RJ11 interface 39 is mainly used in outer answering the call, connect gateway chip 33 by conversion chip 36, it is the PEB33322EL chip that conversion chip 36 can be selected model.Access central apparatus by this plastic fiber user, can realize the Web-compatibles such as protocol conversion, Route Selection, exchanges data, to carrying out intercommunication between the network of different architecture or agreement, and can be used for to the television set transmission integrated information.
As shown in Fig. 6:
Plastic fiber user in the plastic fiber user access networks system (as shown in Figure 3) of the second broadcasting and television network of the present invention accesses central apparatus (POF Home Center), include RF interface 41, plastic fiber optical-electrical converter 42, ONU chip 43, gateway chip 44, multimedia process chip 45, video and tone frequency channel wire interface 46, conversion chip 47, RJ45 interface 48, other interfaces 40 and RJ11 interface 40, wherein RF interface 41 is connected with the ONU chip and all is connected with gateway chip 43, plastic fiber optical-electrical converter 42 is connected with ONU chip 43, gateway chip 44 is connected with multimedia process chip 45, multimedia process chip 45 is connected with tone frequency channel wire interface 46 with video, in addition, conversion chip 47, RJ45 interface 48 all is connected with gateway chip 44 with other interfaces 49, and RJ11 interface 40 is connected with conversion chip 47.
Plastic fiber optical-electrical converter 42 includes plastic fiber transceiver module and the plastic fiber port (all not showing among the figure) that links to each other with the indoor plastic fiber of laying user, be mainly used in finishing, the mutual conversion of downlink electrical signal and plastic fiber light signal, it is the chip of CS8016 that ONU chip 43 is selected Corona system house model, it is the KSZ8695X chip that gateway chip 44 can be selected model, RJ11 interface 40 is mainly used in outer answering the call, connect gateway chip 44 by conversion chip 47, it is the PEB33322EL chip that conversion chip 47 can be selected model.Access central apparatus by this plastic fiber user, can realize the Web-compatibles such as protocol conversion, Route Selection, exchanges data, to carrying out intercommunication between the network of different architecture or agreement, and can be used for to the television set transmission integrated information.
The difference that this gateway and plastic fiber user shown in Figure 5 access central apparatus is: increased an ONU chip between plastic fiber optical-electrical converter 42 and gateway chip 44, thereby the function of POF ONU and POF Home Center is united two into one.
As shown in Fig. 7:
Plastic fiber user in the plastic fiber user access networks system (as shown in Figure 3) of the second broadcasting and television network of the present invention accesses central apparatus (POF Home Center), include RF interface 51, plastic fiber optical-electrical converter 52, embedded type CPU 53, multimedia process chip 54, video and tone frequency channel wire interface 55, conversion chip 56, RJ45 interface 57, other interfaces 58 and RJ11 interface 59, wherein RF interface 51 is connected with the plastic fiber optical-electrical converter and all is connected with embedded type CPU 53, embedded type CPU 53 is connected with multimedia process chip 54, multimedia process chip 54 is connected with tone frequency channel wire interface 55 with video, in addition, conversion chip 56, RJ45 interface 57 all is connected with embedded type CPU 53 with other interfaces 58, and RJ11 interface 59 is connected with conversion chip 56.
Hardware is take flush bonding processor CPU as core, and CPU connects the EPON access module by wan interface, by mini-PCI slot expansion WiFi AP module.The network processing unit minimum system comprise the DDRII interface 64MB SDRAM, 16MB Nor flash, 64MB NAND flash, pci interface, USB interface, Rs232 Console interface, flesh G interface, clock, the peripheral circuit such as reset.The Codec/SLIC circuit is finished simulative telephone interface circuit function and analog-digital conversion function in the VOIP module. connect network processing unit by pcm interface and SPI interface. and the compression/de-compression of voice signal, protocol conversions etc. are finished by network processing unit; The DAA circuit is the FXO interface circuit.When the user dials local telephone network or device looses power. relay can switch to the FXO mouth.
As shown in Fig. 8:
Wherein the design of EPON access module circuit is take ONU MAC chip as core. and can be divided into PON interface circuit, uni interface circuit, embed CPU peripheral storage circuit. and power-switching circuit etc.ONU MAC chip is finished the protocol conversions such as MPCP of IEEE802.3-2005 regulation. and the MAC chip of selecting and firmware thereof meet China Telecom's EPON equipment and technology fully and require V2.1, support CTC V2.1 OAM and expansion thereof.Support the multiple DBA algorithm of CTC regulation, can with the EPON apparatus interconnection intercommunication of supporting CTC V2.1 standard.
Plastic fiber optical-electrical converter 52 includes plastic fiber transceiver module and the plastic fiber port (all not showing among the figure) that links to each other with the indoor plastic fiber of laying user, be mainly used in finishing the mutual conversion of the uplink and downlink signal of telecommunication and plastic fiber light signal, RJ11 interface 59 is mainly used in outer answering the call, connect embedded type CPU 53 by conversion chip 56, it is the PEB33322EL chip that conversion chip 56 can be selected model.Access central apparatus by this plastic fiber user, can realize the Web-compatibles such as protocol conversion, Route Selection, exchanges data, to carrying out intercommunication between the network of different architecture or agreement, and can be used for to the television set transmission integrated information.
Above-mentioned three kinds of plastic fiber users access in the central apparatus (POF Home Center), and optical fiber receiver-transmitter module can use the plastic fiber transceiver of FIRECOMMS company.As Fast Ethernet physical layer adaptive transceiver, because it supports IEEE 802.3 standards, provide the OptoLock interface, can support MAC.Optical fiber receiver-transmitter module of the present invention is different from existing silica fiber transceiver module, and the operation wavelength of employing is visible light, and the silica fiber operation wavelength is 850/1310/1550(nm).Plastic fiber interface of the present invention can be the OptoLock of FIRECOMMS company, also can be the interface that matches with plastic fiber connectors such as SMI type, SC type or SC-RJ types.
Above-mentioned three kinds of plastic fiber users access in the central apparatus (POF Home Center), and the plastic fiber that connects plastics Optical-fiber subscriber access central apparatus (POF Home Center) and other plastic fiber access devices accesses central apparatus (POF Home Center) up-downgoing according to the plastic fiber user and guarantees bandwidth Design.When the unit up-downgoing of plastic fiber multiple-user network guaranteed that bandwidth is no more than 1. 25G, plastic fiber was phase step type plastics optical fibre, and the fibre loss coefficient is less than 260dB/km.When the up-downgoing of plastic fiber multiple-user network unit guaranteed that bandwidth surpasses 1. 25G, plastic fiber was gradational plastic optical fibre, and the fibre loss coefficient is less than 230dB/km.
Above-mentioned three kinds of plastic fiber users access in the central apparatus (POF Home Center), plastic fiber user of the present invention accesses central apparatus (POF Home Center) and also is provided with power supply and corresponding power supply circuits and crystal oscillating circuit, and this power supply, power supply circuits and crystal oscillating circuit all do not show in the drawings.Described power supply circuits comprise that positive SV transfers the dc voltage circuit of positive 3. 3V, positive SV to and transfers the dc voltage circuit that the dc voltage circuit of positive 2. 5V, positive 3. 3V transfer positive 1. 2V to.Be specially: positive SV direct voltage is transformed to positive 3. 3V direct voltages by linear voltage regulator (such as LM1117), and is transported to each chip by the 4th pin of this linear voltage regulator; Positive SV direct voltage (is transformed to positive 2. 5V direct voltages such as LP3963, and is transported to each chip by the 4th pin of this linear voltage regulator by linear voltage regulator; Positive 3. 3V direct voltages are transformed to 1. 2V direct voltages by linear voltage regulator (such as LM1117), and are transported to each chip by the 4th pin of this linear voltage regulator.The frequency of described crystal oscillating circuit is 25MHZ, and its input port is connected the output port of being connected with the plastic fiber optical-electrical converter with silica fiber optical-electrical converter 201 and is connected with input port with output port.
Because the present invention adopts plastic fiber access, plastic fiber (POF) is compared with silica fiber as novel data transmission media, has thicker core diameter, advantages such as pliability that acceptance angle is large and good, so easy to connect, coupling efficiency is high; The advantage that has simultaneously high bandwidth, vibration resistance, radioresistance, low price, easy construction is compared with twisted-pair feeder, and is lightweight, without electromagnetic interference, is with roomyly, is best short-range data transmission medium.
Therefore the present invention has alleviated the problem of the interior signal attenuation of high band channel and reflection greatly, channel width also meets the channel width planning requirement of China's radio and television Access Network, be conducive to the reasonable distribution of channel and effectively utilization, and can solve and solve service quality (QoS) security problem, provide the required QoS such as the miscellaneous service that comprises real time flow medium.
The design of Cable TV Wide Band Insert Technology, it must follow following principle, and the present invention can reach the requirement of following principle.
Standard principle: must follow national standard and the industry standard of having promulgated.Guarantee that the technology that develops has horizontal and vertical compatibility.Avoid CATV broadband access network to become isolated island in the next generation network.
Principle of reasonableness: the demand that proposes should have sufficient technology to realize feasibility under the precondition that takes full advantage of and excavate existing Transforming of Wire TV Cable assets.Should avoid causing the technological development that significantly to transform existing Transforming of Wire TV Cable assets.Thereby protect to greatest extent the maximizing the benefits of existing investment, performance stock assets.
The extensibility principle: the user's request of broadband access and the development of technology are long-term, progressive.Demand Design must guarantee advance and extensibility, and advance refers to reflect the near and mid-terms user's request in future; On the other hand, extensibility has guaranteed and can satisfy following demand at a specified future date by expansion.The technology and the system that guarantee exploitation can carry out smooth upgrade along with business demand expansion and technological progress.And autgmentability must be able to meet the trend of mainstream technology development, the trend of catering to " light entering and copper back ".
Controlled principle: must satisfy manageability, the controllability of different angles different aspects, guarantee the standard of network operation and the sound development of network.
Economy principle: the broadband access technology of guaranteeing to develop has good economy on the basis of guaranteed performance.
Above content is the further description of the present invention being done in conjunction with concrete optimal technical scheme, can not assert that implementation of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (10)
1. the plastic fiber user access networks system of a broadcasting and television network is characterized in that, described system comprises that plastic fiber optical network unit, user terminal or digital television and plastic fiber user access central apparatus or digital TV set-top box;
The radio and television Access Network connects plastics fiber optic network unit by silica fiber or plastic fiber, and the plastic fiber optical network unit is used for providing various broadband services to the user who links to each other;
The radio and television Access Network passes through coaxial cable, connect plastics Optical-fiber subscriber access central apparatus or digital TV set-top box, the plastic fiber optical network unit is also by the diverse network transmission medium, connect plastics Optical-fiber subscriber access central apparatus or digital TV set-top box, the plastic fiber user accesses the exchange that central apparatus or digital TV set-top box are used for realizing household internal information and family's external information;
The plastic fiber user accesses central apparatus by various transmission mediums, links to each other with user terminal or digital television, and user terminal or digital television are for contact to realize the diverse network application with the end user.
2. the system as claimed in claim 1 is characterized in that,
Connect in the situation of plastics fiber optic network unit by silica fiber at the radio and television Access Network, the silica fiber optical signal source is in the radio and television Access Network, be connected to the plastic fiber optical network unit by silica fiber again, then transmit with the silica fiber light signal in the silica fiber, after the silica fiber light signal arrived the plastic fiber optical network unit, the silica fiber light signal was converted to the silica fiber optical-electrical converter signal of telecommunication, the plastic fiber optical-electrical converter signal of telecommunication, plastic fiber light signal successively; Then by described plastic fiber, the plastic fiber optical signal transmission is accessed central apparatus to the plastic fiber user, the plastic fiber user accesses central apparatus the plastic fiber light signal is converted into the plastic fiber optical-electrical converter signal of telecommunication, be converted into again the video/audio signal of telecommunication, be transferred to user terminal or digital television;
Vice versa;
Connect by plastic fiber in plastics fiber optic network unit and the plastic fiber optical network unit situation by plastic fiber connection plastics Optical-fiber subscriber access central apparatus at the radio and television Access Network, the plastic fiber optical signal source is in the radio and television Access Network, pass through again plastic fiber, the plastic fiber optical signal transmission is arrived the plastic fiber optical network unit, pass through again plastic fiber, the plastic fiber optical signal transmission is accessed central apparatus to the plastic fiber user, the plastic fiber user accesses central apparatus the plastic fiber light signal is converted into the plastic fiber optical-electrical converter signal of telecommunication, be converted into again the video/audio signal of telecommunication, be transferred to user terminal or digital television;
Vice versa;
Connect by plastic fiber at the radio and television Access Network in the situation of plastics fiber optic network unit and plastic fiber optical network unit non-plastic fiber transmission medium connection digital TV set-top box by other, the plastic fiber optical signal source is in the radio and television Access Network, pass through again plastic fiber, the plastic fiber optical signal transmission is arrived the plastic fiber optical network unit, the plastic fiber optical network unit is converted into the plastic fiber optical-electrical converter signal of telecommunication with the plastic fiber light signal, and convert the plastic fiber optical-electrical converter signal of telecommunication to other transmission medium signal of telecommunication, digital TV set-top box converts other transmission medium signals of telecommunication to the video/audio signal of telecommunication again, is transferred to user terminal or digital television;
Vice versa;
And the existing signals transmission of radio and television Access Network in the plastic fiber user access networks system of this broadcasting and television network is constant.
3. the system as claimed in claim 1 is characterized in that, described diverse network transmission medium includes but not limited to the transmission mediums such as coaxial cable, twisted-pair feeder, optical fiber, WIFI.
4. the plastic fiber user access networks system of a broadcasting and television network is characterized in that, described system comprises that the plastic fiber user accesses central apparatus, user terminal or digital television;
The radio and television Access Network passes through coaxial cable, connect plastics Optical-fiber subscriber access central apparatus, and the radio and television Access Network passes through plastic fiber, directly connect plastics Optical-fiber subscriber access central apparatus, the plastic fiber user accesses the exchange that central apparatus is used for realizing household internal information and family's external information;
The plastic fiber user accesses central apparatus by various transmission mediums, links to each other with user terminal or digital television, and user terminal or digital television are for contact to realize the diverse network application with the end user.
5. system as claimed in claim 4, it is characterized in that, the plastic fiber optical signal source is in the radio and television Access Network, pass through again plastic fiber, be connected to the plastic fiber user and access central apparatus, then the plastic fiber user accesses central apparatus the plastic fiber light signal is converted into the plastic fiber optical-electrical converter signal of telecommunication, is converted into the video/audio signal of telecommunication again, is transferred to user terminal or digital television;
Vice versa;
And the existing signals transmission of radio and television Access Network in the plastic fiber user access networks system of this broadcasting and television network is constant.
6. the plastic fiber user of a broadcasting and television network accesses central apparatus, it is characterized in that, described equipment includes the RF interface, the plastic fiber optical-electrical converter, the gateway chip, the multimedia process chip, video and tone frequency channel wire interface, conversion chip, the RJ45 interface, RJ11 interface and other interfaces, wherein the RF interface is connected with the plastic fiber optical-electrical converter and is connected with the gateway chip, the gateway chip is connected with the multimedia process chip, the multimedia process chip is connected with the tone frequency channel wire interface with video, in addition, conversion chip, the RJ45 interface all is connected with the gateway chip with other interfaces, and the RJ11 interface is connected with conversion chip.
7. the plastic fiber user of a broadcasting and television network accesses central apparatus, it is characterized in that, described equipment includes the RF interface, the plastic fiber optical-electrical converter, the ONU chip, the gateway chip, the multimedia process chip, video and tone frequency channel wire interface, conversion chip, the RJ45 interface, RJ11 interface and other interfaces, wherein the RF interface is connected with the ONU chip and is connected with the gateway chip, the plastic fiber optical-electrical converter is connected with the ONU chip, the gateway chip is connected with the multimedia process chip, the multimedia process chip is connected with the tone frequency channel wire interface with video, in addition, conversion chip, the RJ45 interface all is connected with the gateway chip with other interfaces, and the RJ11 interface is connected with conversion chip.
8. the plastic fiber user of a broadcasting and television network accesses central apparatus, it is characterized in that, described equipment includes the RF interface, the plastic fiber optical-electrical converter, embedded type CPU, the multimedia process chip, video and tone frequency channel wire interface, conversion chip, the RJ45 interface, RJ11 interface and other interfaces, wherein the RF interface is connected with the plastic fiber optical-electrical converter and is connected with embedded type CPU 53, embedded type CPU is connected with the multimedia process chip, the multimedia process chip is connected with the tone frequency channel wire interface with video, in addition, conversion chip, the RJ45 interface all is connected with embedded type CPU with other interfaces, and the RJ11 interface is connected with conversion chip.
9. such as claim 5 or 6 or 7 described equipment, it is characterized in that when up-downgoing guaranteed that bandwidth is no more than 1.25G, described plastic fiber was phase step type plastics optical fibre, loss factor is less than 260dB/km.
10. such as claim 5 or 6 or 7 described equipment, it is characterized in that when up-downgoing guaranteed that bandwidth surpasses 1.25G, described plastic fiber was gradational plastic optical fibre, loss factor is less than 230dB/km.
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