CN101242461A - An integrated access terminal under FTTH condition - Google Patents
An integrated access terminal under FTTH condition Download PDFInfo
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- CN101242461A CN101242461A CNA2008100144303A CN200810014430A CN101242461A CN 101242461 A CN101242461 A CN 101242461A CN A2008100144303 A CNA2008100144303 A CN A2008100144303A CN 200810014430 A CN200810014430 A CN 200810014430A CN 101242461 A CN101242461 A CN 101242461A
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Abstract
The present invention provides an integrated access terminal under the condition of Fiber To The Home (FTTH). The terminal mainly includes a photoelectric conversion unit, an audiovideo signal processing unit and an IP processing unit three main function units, completing the integrated access of video, audio, data services. Digital television service of DVB standard and IP service based on the EPON protocol are loaded on two wavelengths utilizing WDM technology, completing the signal transmission utilizing another three wavelengths. For audio/video businesses, the access system can support DVB, IPTY service modes and two display terminals of television and individual computer, substantial utilizing respective advantages of the DVN, IPTV service video and advantages of television and individual computer as display terminal. In addition, the access terminal system also can complete Internet service and VoIP service access by EPON transport protocols.
Description
Technical field
The present invention relates to a kind ofly under the FTTH condition, realize the information accessing terminal that many information, multisystem, multi-service merge.Under the EPON access conditions, created many information operatings operation platform of a resource-sharing, system compatible, the network integration for the terminal use.
Background technology
Fast development along with information technology and industry, the transmission network that makes up separately round business such as data, voice, videos exists following problem: the one, and the repeated construction of a plurality of bearer networks, cause the additional waste of resource, many nets engineering takies limited space repeatedly, damages natural environment, simultaneously, the input of many nets equipment has also strengthened the cost of operation; The 2nd, majority of network is to finish networking with cable, and not only the information transmitted amount is limited, and because the natural deterioration of cable switching performance makes the signal transmission not smooth, and cause service quality to descend.Because the physical characteristic that optical fiber is good and the high speed development of optical communication technique, optical fiber is as the access medium of the best, Fiber to the home (FTTH) can thoroughly solve the bandwidth problem of access, and it will be the trend of Access Network development and will bear the important task of " many net unifications ".
And aspect the Network development, the data service that with Internet is representative maintains sustained and rapid growth, with DVB and IPTV be the audio frequency and video business of representative will long-term co-existence development, the development of popularity rate that simulated television has had and capability of personal computers and quantity, when making the two as display terminal, the characteristics that have self separately are also with long-term co-existence.Based on the voice service of VoIP, because its cheap price has also obtained vigorous growth in recent years, also will be as the main bearing mode of voice service in the next generation network (NGN).
Summary of the invention
Technical problem to be solved by this invention provides a kind of under following FTTH access conditions, realizes the integrated access terminal system that many information, multisystem, multi-service are merged.System comprises photoelectric conversion unit, audio-video signal processing unit and three major function unit of IP data processing unit, as shown in Figure 1.
Photoelectric conversion unit is to be used for the opto-electronic conversion of downstream signal and the electric light conversion of upward signal.When handling downlink optical signal, at first will carry the wavelength of DVB business and carry the wavelength (de) multiplexing of EPON data service, the former is carried out opto-electronic conversion after, utilize tuner to carry out demodulation and send into the audio-video signal processing unit; After the light signal of carrying EPON data service carried out opto-electronic conversion, send into the IP data processing unit.At up direction, carry out electric light conversion for the IP data that are packaged into the EPON frame, with another one independently wavelength finish the transmission of upward signal.The audio-video signal processing unit is responsible for the MPEG-2 digital audio-video signal of DVB standard and the digital audio-video signal that is used for after IPTV encodes are decoded, and delivers in the simulated television through behind the analog encoding afterwards.It carries out the master chip of MPEG-2 decoding by one and the coprocessor and the analog audio-video encoder of IPTV decoding formed.
The IP data processing unit is responsible for the processing with the various IP operation of EPON agreement carrying, the VoIP business is carried out the access of encoding and decoding and Internet business etc.It is finished by the EPON special module exchange of IPTV, Internet data and VOIP business is handled.The IPTV business is sent into later the audio frequency and video processing unit by the FPGA processing; The Internet data service is connected with subscriber computer by the RJ-45 interface, finishes the access of data service; The VoIP business is sent into the VoIP codec, be connected with the subscriber household phone, finish the access of speech business by RJ-11.
Provided this concrete function structure that accesses terminal among Fig. 2.System adopts built-in Linux operating system, and the Bootloader procedure stores is in BOOT ROM, and memory devices such as Flash, SDRAM are used for the storage of complete operation system kernel, system application and data file.Serial port module is debugging and the programming that is used for system program.Receive (CA) technology for widely used condition in the professional employing of the audio frequency and video digital television business and carry out access control.
The use of FPGA module is for DVB is professional and IPTV business are sent in the audio/video decoding unit flexibly, for the TS stream that comes self-tuning/demodulator, directly sends into DVB decoding master chip.And for the IPTV business from the EPON special module, send into respectively in DVB master chip and the IPTV decoding coprocessor, finish the decoding of IPTV business jointly by two decoding chips.And for the last signals such as user's program request order that the DVB master chip sends over, also be to deliver in the EPON special module through the FPGA module, finish further processing.
Among the present invention, with the access conditions of EPON technology realization FTTH, its system configuration as shown in Figure 3.System equipment mainly comprises:
Optical link unit (OLT) is equivalent to the local side apparatus of EPON network.On down direction, OLT is used for the reception of miscellaneous services such as DVB in backbone network/metropolitan area network, IPTV, Internet and speech.Wherein DVB is professional is carried on λ respectively with other various IP-based business
3, λ
1On two different wave lengths, finish descending transmission.On up direction, OLT is responsible for each connecting system and distributes ascending time slot, and the various data messages of the up transmission of processing terminal equipment;
Light path allocation units (ODN) utilize optical branching device passive devices such as (Splitter), and downstream signal is carried out shunt, send to user's access terminal equipment, and finish the multiplexing of user uplink signal, pass back to the OLT unit;
Integrated access terminal: finish the reception of downlink optical signal, and carry out the processing of corresponding IP operation and DVB business.Protocol processes, the electricity/light conversion of user uplink signal finished in up aspect and the fixedly time slot that distributes in the OLT unit carries out up transmission.
When integrated access terminal is handled at the digital television business that carries out the DVB standard, at first the 1550nm wavelength that is carried on the DVB business is finished demultiplexing by photoelectric conversion unit, and after being converted to the signal of telecommunication, the radiofrequency signal of the carrying DVB business that recovers being sent into tuner carry out demodulation; Finish the TS of the DVB standard after the demodulation, after the audio-video signal processing unit processes, send into user's simulated television terminal, finish the broadcast of DVB business.
For various IP operation with the carrying of EPON agreement, finish demultiplexing by photoelectric conversion unit to carrying this professional 1490nm wavelength equally, after the IP data processing unit is finished protocol processes to the IPTV business, Internet business and the VoIP business that are packaged into the EPON frame, the IPTV business is sent into the audio-video signal processing unit, equally by user's simulated television terminal, finish the broadcast of IPTV business afterwards; Simultaneously the IP data processing unit also can send user's personal computer to by the RJ-45 interface through the IPTV business after the protocol processes, utilizes the software decode technology of computer to finish the broadcast of IPTV business.In addition, can also finish the access of data services such as Internet by the RJ-45 interface.
For the VoIP business of removing after the EPON frame encapsulates, at first decode through decoder, be connected with subscriber phone by RJ-11 then, finish the descending access of voice service.
Transmission for professional upward signal such as video request program (VOD), Internet and VoIP, the processing procedure that accesses terminal is: for TV user, upward signals such as its video request program are by the DVB master chip response of audio frequency and video processing unit, send into the IP data processing unit, be packaged into the EPON frame.After finishing the electric light conversion by photoelectric conversion module again, carry out up transmission;
For personal computer user, its upward signal is sent into the IP data processing unit through the RJ-45 mouth, is packaged into the EPON frame equally.After finishing the electric light conversion by photoelectric conversion module again, carry out up transmission; For the voip user, its upward signal is sent into the VoIP encoder through RJ-11, finishes the coding back and is packaged into the EPON frame by the IP data processing unit, through after the electric light conversion, finishes up transmission again.
Description of drawings
Fig. 1 forms three functional unit circuit block diagrams of FTTH integrated access terminal;
The system configuration schematic diagram of Fig. 2 integrated access terminal;
Fig. 3 is based on the FTTH connecting system structural representation of EPON technology;
Fig. 4 terminal equipment is to the process chart of audio/video on-demand business.
Execution mode
In of the present invention the accessing terminal, the FTTH access conditions is to utilize the EPON technology to realize.Its system configuration as shown in Figure 3.In the OLT unit, transmit based on the program stream of DVB standard wavelength and WDM technology by special use, simplified DVB agreement and the complexity of EPON technology on host-host protocol is handled based on Ethernet protocol greatly.This carrying scheme can realize broadcasting, the demand (telecommunication) service of IPTV and DVB dual mode simultaneously, both can make full use of the IPTV interactivity good, can carry out characteristics such as multicast, kept the abundant advantage of DVB program source again.This external system can also utilize the allocated bandwidth strategy among the EPON, and as differential service (SLA), Dynamic Bandwidth Allocation (DBA), technology such as resource reservation protocol (rsvp) are to improve system bandwidth utilance and service transmission quality.
For the concrete working method of FTTH system, the flow process of handling at its down direction is:
A, OLT unit receive the miscellaneous service in backbone/metropolitan area network, for the DVB business with λ
3Wavelength carries, and for the miscellaneous service based on the IP agreement, as IPTV, Internet and VoIP etc., it is encapsulated as the EPON frame, with λ
1Wavelength transmits;
B, λ
1, λ
3The downlink optical signal of wavelength utilizes the shunt function of ODN unit behind the WDM repeated use of device, downstream signal is sent to each user terminal;
Downstream signal comprises in the processing procedure that accesses terminal:
Finish demultiplexing behind the light signal behind C1, two wavelength multiplexings of photoelectric conversion unit reception, and after being converted to the signal of telecommunication, the radiofrequency signal (RF) of carrying DVB is sent into tuning unit demodulates, the various IP data that are packaged into the EPON frame are sent into the IP data processing unit;
C2, finish the TS of the DVB standard after the demodulation, after the audio-video signal processing unit processes, send into user's simulated television terminal, finish the broadcast of DVB business;
After C3, IP data processing unit are finished protocol processes to the IPTV business, Internet business and the VoIP business that are encapsulated as the EPON frame, the IPTV business is sent into the audio-video signal processing unit, equally by user's simulated television terminal, finish the broadcast of IPTV business afterwards;
C4, user utilize the RJ-45 interface to finish the access of Internet business by personal computer, can also finish the broadcast of IPTV business in addition by the software decode technology;
C5, VoIP are professional to be connected with subscriber phone by RJ-11 through the decoding back, finishes the descending access of speech business.
The FTTH system to the handling process of upward signal is:
At first finish following processing by integrated access terminal:
A1, for TV user, upward signals such as its video request program by the response of the DVB master chip of audio frequency and video processing unit, are sent into the IP data processing unit, are packaged into the EPON frame.After finishing the electric light conversion by photoelectric conversion module again, according to OLT unit distributed time slot, with λ
2Wavelength carries out up transmission;
A2, for personal computer user, its upward signal is sent into the IP data processing unit through the RJ-45 mouth, is packaged into the EPON frame equally.After finishing the electric light conversion by photoelectric conversion module again, equally according to OLT unit distributed time slot, with λ
2Wavelength carries out up transmission;
A3, for the voip user, its upward signal is sent into the VoIP encoder through RJ-11, finishing coding back and being packaged into the EPON frame by the IP data processing unit, again through after the electric light conversion, according to OLT unit distributed time slot, with λ
2Wavelength is finished up transmission; Time division multiplexing is finished to it after receiving the upward signal that sends according to different time-gap from each terminal in B, ODN unit, sends to the OLT unit then;
Corresponding processing is finished in C, OLT unit after receiving user's upstream data.After for example business such as VoIP, Internet being finished protocol processes, send in metropolitan area/backbone network, carry out the route of next jumping; Then send in the corresponding vod server for command informations such as video request programs.
Embodiment
Core of the present invention provides a kind of method that digital high-definition audio/video business is provided for the user by ethernet passive optical network.Utilize superior transmission performance of ethernet passive optical network and two-way interactive characteristic, finish functions such as the broadcast transmission of digital high-definition program and mutual program request.
Specific embodiments of the present invention: on down direction, will be based on EPON protocol of I P data packet transmission and transmission based on the digital television business of DVB standard, be carried on different wave length 1490nm and the 1550nm by the WDM mode, thereby simplified the complexity of system on protocol processes greatly.On up direction, terminal equipment utilizes OLT unit distributed time slot, carries out the transmission of upward signal by the 1310nm wavelength.
Based on the said system solution, the system configuration of EPON mainly comprises: the optical link unit, be used for the reception of miscellaneous service in backbone network/metropolitan area network, and the various data of the up transmission of processing terminal equipment; The light path allocation units carry out shunt by passive devices such as optical branching devices with downstream signal, send to each user's access device, and finish the multiplexing of user uplink signal, pass back to the OLT unit; Integrated access terminal is finished the reception of downlink optical signal, and carries out the processing of corresponding IP data, DVB business, finishes the response of user's program request order and the decoding of descending digital high-definition television program stream.Electricity/light the conversion of user uplink signal is finished in up aspect and the fixedly time slot that distributes in the OLT unit carries out up transmission.
Is example with terminal equipment to the response of user video demand (telecommunication) service, and the workflow of system as shown in Figure 4.Comprise by the processing procedure that PC carries out program request for the user:
A, user's program request order sends the IP data processing unit to by the RJ-45 interface, and the EPON module of IP data processing unit is distinguished user's program request approach according to different port numbers, and IP Information On Demand is packaged into the Ethernet frame;
B, finish the conversion of electricity/light,,, carry out up transmission according to OLT unit distributed time slot with the 1310nm wavelength by electrooptic switching element;
C, by the OLT unit program request order is sent to corresponding ordering server, vod server response user command sends to OLT by the IP mode with the program of institute's program request;
D, OLT are the LLID (LLID) that descending request program adds the terminal equipment that sends IP Information On Demand, are packaged into the EPON frame format, are carried out the transmission of light signal by the 1550nm wavelength.
E, finish the light of 1490nm light signal/electricity conversion, corresponding Frame is sent to the IP data processing unit by the photoelectric conversion unit of terminal equipment;
F, IP data processing unit filter out correct EPON frame, solve the IP program stream, utilize the port numbers of user's program request, send to user PC by the RJ-45 interface.
Comprise by the processing procedure that TV carries out program request for the user:
A, user's program request order is at first responded by the DVB master chip of audio frequency and video processing unit, sends to the IP data processing unit through the FPGA module;
The EPON module of b, IP data processing unit obtains user's IP Information On Demand by the port numbers of IP Information On Demand, and the program request order is packaged into the EPON frame;
C, finish the electricity of up program request signal/light conversion,,, carry out up transmission according to OLT unit distributed time slot with the 1310nm wavelength by electrooptic switching element;
D, by the OLT unit program request order is sent to corresponding ordering server, vod server response user command sends to OLT by the IP mode with the program of institute's program request;
E, OLT add the LLID address of corresponding terminal equipment according to the IP address of program stream, carry out the transmission of on-demand content with the light signal of 1490nm wavelength.Perhaps when a plurality of users program request simultaneously same program, by adding multicast LLID address, and utilize the control of IGMP (igmpinternet), finish multicast and send, to improve the utilance of downlink bandwidth;
F, finish the light of 1490nm light signal/electricity conversion, corresponding Frame is sent to the IP data processing unit by the photoelectric conversion unit of terminal equipment;
The EPON module of g, IP data processing unit filters out correct EPON frame according to the LLID address in the downlink data packet, solves the IP program stream, utilizes the port numbers of user's program request, sends to the audio frequency and video processing unit by the FPGA module;
H, finish the decoding of request program stream, and the coding of analog audio-video signal, be sent to user's TV terminal by the audio frequency and video processing unit.
Claims (5)
1, the integrated access terminal under a kind of FTTH condition is characterized in that, the main component units of this terminal system comprises: photoelectric conversion unit is used for the opto-electronic conversion of downstream signal and the electric light conversion of upward signal; The audio-video signal processing unit is responsible for the MPEG-2 digital audio-video signal of DVB standard and the digital audio-video signal that is used for after IPTV encodes are decoded, and finishes broadcast in the simulated television through delivering to behind the analog encoding more afterwards; The IP data processing unit is responsible for the various IP operation with the EPON protocol encapsulation are handled.
2, the integrated access terminal under the FTTH condition according to claim 1, it is characterized in that: photoelectric conversion unit is when handling downlink optical signal, at first will carry the wavelength of DVB business and the wavelength (de) multiplexing of carrying EPON data service, after the former is carried out opto-electronic conversion, utilize tuner to carry out demodulation and send into the audio-video signal processing unit; After the light signal of carrying EPON data service carried out opto-electronic conversion, send into the IP data processing unit,, carry out the electric light conversion for the IP data that are packaged into the EPON frame at up direction, with another one independently wavelength finish the transmission of upward signal.
3, the integrated access terminal under the FTTH condition according to claim 1, it is characterized in that, carry out the master chip of MPEG-2 decoding by one and the coprocessor and the analog audio-video encoder of IPTV decoding formed for the audio-video signal processing unit, finish corresponding decoding for the DVB business by master chip, then finish its corresponding decoding jointly by master chip and coprocessor for the IPTV business.
4, the integrated access terminal under the FTTH condition according to claim 1, it is characterized in that, for the IP data processing unit, finish by the EPON special module exchange of the IPTV, Internet data and the VOIP business that are packaged into the EPON frame is handled, send into the audio frequency and video processing unit after the IPTV business is handled by FPGA; The Internet data service is connected with subscriber computer by the RJ-45 interface, finishes the access of data service; The VoIP business is sent into the VoIP codec, be connected with the subscriber household phone, finish the access of speech business by RJ-11.
5, the integrated access terminal under the FTTH condition according to claim 1, it comprises following processing procedure at down direction:
A, photoelectric conversion unit at first carry out demultiplexing to the light signal behind two wavelength multiplexings, and after being converted to the signal of telecommunication respectively, the radiofrequency signal of carrying DVB are sent into tuning unit demodulates, and the various IP data that are packaged into the EPON frame are sent into the IP data processing unit;
B, finish the TS of the DVB standard after the demodulation, after the audio-video signal processing unit processes, send into user's simulated television terminal, finish the broadcast of DVB business;
After C, IP data processing unit are finished protocol processes to IPTV business, Internet business and the VoIP business of encapsulation EPON frame, the IPTV business is sent into the audio-video signal processing unit, equally by user's simulated television terminal, finish the broadcast of IPTV business afterwards;
D, user utilize the RJ-45 interface to finish the access of Internet business by personal computer, also finish the broadcast of IPTV business in addition by the software decode technology;
E, VoIP are professional to be connected with subscriber phone by RJ-11 through the decoding back, finishes the descending access of speech business.
6, the integrated access terminal under the FTTH condition according to claim 1, it comprises following processing procedure at up direction:
A, for TV user, its video request program upward signal by the response of the DVB master chip of audio frequency and video processing unit, is sent into the IP data processing unit, is packaged into into the EPON frame format, finish the electric light conversion by photoelectric conversion module again after, carry out up transmission;
B, for personal computer user, its upward signal is sent into the IP data processing unit through the RJ-45 interface, is packaged into the EPON frame format equally, finish electric light conversion by photoelectric conversion module again after, carry out up transmission;
F, for the voip user, its upward signal is sent into the VoIP encoder through RJ-11, finishing coding back and being packaged into the EPON frame by the IP data processing unit, through after the electric light conversion, finishes up transmission again.
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| CNA2008100144303A CN101242461A (en) | 2008-03-05 | 2008-03-05 | An integrated access terminal under FTTH condition |
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| CNA2008100144303A CN101242461A (en) | 2008-03-05 | 2008-03-05 | An integrated access terminal under FTTH condition |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102130805A (en) * | 2011-03-09 | 2011-07-20 | 山东大学 | Fusion access-oriented multi-service terminal system |
| CN102480400A (en) * | 2010-11-30 | 2012-05-30 | 康佳集团股份有限公司 | Three-network combination system and digital home terminal |
| CN102752049A (en) * | 2012-07-19 | 2012-10-24 | 青岛海信宽带多媒体技术有限公司 | Local area network applying plastic optical fiber (POF) networking as well as optical switchboard and photoconverters of local area network |
| CN103607671A (en) * | 2013-11-08 | 2014-02-26 | 浙江省广电科技股份有限公司 | FTTH three-network integrated terminal with bandwidth of 2.7 GHz |
| CN103986491A (en) * | 2014-02-27 | 2014-08-13 | 沈阳新邮通信设备有限公司 | EPON device |
| CN113644977A (en) * | 2021-08-05 | 2021-11-12 | 武汉凹伟能源科技有限公司 | Bidirectional passive laser telephone audio transmission network and sound source positioning method thereof |
-
2008
- 2008-03-05 CN CNA2008100144303A patent/CN101242461A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102480400A (en) * | 2010-11-30 | 2012-05-30 | 康佳集团股份有限公司 | Three-network combination system and digital home terminal |
| CN102480400B (en) * | 2010-11-30 | 2015-12-09 | 康佳集团股份有限公司 | A kind of three-network integration system and digital home terminal |
| CN102130805A (en) * | 2011-03-09 | 2011-07-20 | 山东大学 | Fusion access-oriented multi-service terminal system |
| CN102130805B (en) * | 2011-03-09 | 2013-06-19 | 山东大学 | Fusion access-oriented multi-service terminal system |
| CN102752049A (en) * | 2012-07-19 | 2012-10-24 | 青岛海信宽带多媒体技术有限公司 | Local area network applying plastic optical fiber (POF) networking as well as optical switchboard and photoconverters of local area network |
| WO2014012273A1 (en) * | 2012-07-19 | 2014-01-23 | 青岛海信宽带多媒体技术有限公司 | Local area network employing pof networking, and optical switch and optical converter therefor |
| CN102752049B (en) * | 2012-07-19 | 2015-12-16 | 青岛海信宽带多媒体技术有限公司 | The local area network (LAN) of application POF networking and optical switch and photoconverter |
| CN103607671A (en) * | 2013-11-08 | 2014-02-26 | 浙江省广电科技股份有限公司 | FTTH three-network integrated terminal with bandwidth of 2.7 GHz |
| CN103986491A (en) * | 2014-02-27 | 2014-08-13 | 沈阳新邮通信设备有限公司 | EPON device |
| CN113644977A (en) * | 2021-08-05 | 2021-11-12 | 武汉凹伟能源科技有限公司 | Bidirectional passive laser telephone audio transmission network and sound source positioning method thereof |
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Open date: 20080813 |