CN1259812A - Wide band multi media service system - Google Patents
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- CN1259812A CN1259812A CN 99121988 CN99121988A CN1259812A CN 1259812 A CN1259812 A CN 1259812A CN 99121988 CN99121988 CN 99121988 CN 99121988 A CN99121988 A CN 99121988A CN 1259812 A CN1259812 A CN 1259812A
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Abstract
The system consists of center network station, main exchanging network and wide band cut-in network which are connected by transmission medium like optical fibre etc, the area end and user end of wide band cut-in network are connected by twisted-pair wire. The data transmission of external connecting the center network station with internet is based on the telecommunication main exchanging network to form main exchanging and transmitting network. The wide band cut-in network is connected with telephone network and modulating-demodulating unit of user end by twisted-pair wire, then the modulating-demodulating unit is connected with roof box or other terminal device.
Description
The present invention relates to multi-media network, be specifically related to a kind of wide band multi media service system.It is a kind of based on the broadband access network system that IP network value-added service service is provided on the conventional communication networks basis, realizes real high-speed link on the copper twisted-pair feeder.Especially set up a kind of wide band multi media service system based on public telephone network (PSTN).
Demand sharp increase along with information service, increasing user does not satisfy basic voice service, demand to broadband communication services such as data, literal, image, multimedias is urgent day by day, and many users require communication network that various high speed data communication services can be provided quickly and easily.And broadband services is exactly with blended data communications such as image, voice, data, videos.All kinds of video multimedia broadband services begin to emerge in large numbers.
Provide the multimedia broad band business service to be mainly used in video on-demand system (Video On Demand), video on-demand system mainly is made of program supplier, server, broadband access network (local side, user side), transmission switching network, service management, accounting management, ustomer premises access equipment (Set Top Box).
At present, the transmission switching network is the core net of video on-demand system, adopts the fiber optic network of atm technology more.High-speed figure transmission technology (optical fiber SDH technology) and broadband switching technology (atm technology) are growing, and the broadband of backbone network becomes a reality, advanced arterial grid and become increasingly conspicuous based on gap and contradiction between traditional Access Network of copper twisted-pair feeder.Broadband access network just becomes the key of wideband multimedia network system, mainly is divided into wired access and wireless access dual mode.The current line access mode that has been mainly, Access Network is still based on copper cable.Various access technologies: optical fibre-coaxial cable mixes (HFC) technology, and coaxial cable is main access technology, high-speed digital subscriber line (HDSL), and ADSL (Asymmetric Digital Subscriber Line) (ADSL and VDSL), the flowers vie with each other in beauty for Integrated Service Digital Network etc.
In existing related techniques, high can to sprout the bright patent No. be the internet communication that " distributed wide-band interconnection network " of CN 1191433A also tries hard to realize the broadband two-forty by Shanghai.But this invention is based on the cable television network of optical fiber coaxial cable on transmission medium, adopts code division multiple access (CDMA) technology to improve transmission rate.In the patent No. is a kind of method that realizes video request program (VOD) by the asynchronous transfer mode ATM network network of also having introduced among the EP0756422A1 " Multi-media services system " (multimedia service system) by name.
It is the technology emphasis that the wideband transmit ability is provided on original twisted-pair feeder basis.Above-mentioned access technology all exists deficiency in varying degrees: ADSL and VDSL along with its transmission rate of increase of coverage descends gradually; The digital technology that fiber/copper axle cable hybrid technology adopts simulation frequency division technique and backbone network to adopt does not match, and has increased difficulty synchronous, network management technology; Coaxial cable is that main access technology is an one-way transmission, lacks exchanging mechanism, and bi-directional symmetrical/asymmetric traffic difficulty is provided.
In addition, distance is no more than 5km in most cases from exchange or service node to user terminal, may have only 1km at the city most cases, is the bottleneck of service access in view of Access Network, be the final stage of network digitalization, the appellation of " last a kilometer " is just come therefrom.Because Access Network has a large capacity and a wide range, it is the most important parts that influences networking and operating cost, ratio of performance to price requirement to access network technology is very high, and the exploitation of access network technology is quite crucial, and the people claims that Access Network is " last difficult kilometer " or " last very long kilometer ".How solving " last kilometer " problem, is the key of wideband multimedia communication.
The present invention seeks to set up a kind of based on public telephone network (PSTN), on copper twisted-pair feeder basis, realize wideband transmit; Adopt the broadband multimedia network system of point-to-point mode, hub-and-spoke configuration.Thereby utilize the most universal existing resource, improve transmission rate, realize that the broadband high speed of common copper twisted-pair feeder inserts, finishing black phone combines for the data network on basis with packetizing ATM/IP, make each user exclusively enjoy broadband resource, satisfy its demand, and progressively stride forward to digitlization, broadband, intelligent and personalized broad band Integrated service service system to the video multimedia service.The present invention also discloses the service system of the video request program that realizes based on public telephone network (PSTN).
According to a kind of wide band multi media service system of the present invention, this system is made up of center website, trunk switching network, broadband access network; It is characterized in that: center website, trunk switching network, broadband access network are realized being communicated with by transmission mediums such as optical fiber; The local side and the user side of broadband access network are communicated with by twisted-pair feeder; Center website outreaches Internet, and transfer of data is based on telecommunications trunk switching network, to form the trunk switched transport network; Broadband access network and public telephone network link, and are connected with the user side modulator-demodulator by twisted-pair feeder, and modulator-demodulator is connected with set-top box or other terminal equipment again.
According to above-mentioned wide band multi media service system, it is characterized in that: center website comprises: charge system, network management system, Web server, ftp server, Mail server, content server and video service system, by the mutual UNICOM of Ethernet switch; Outlet inserts Internet at a high speed by fire compartment wall and router; And the access ATM switch is communicated with the trunk switching network; Servers such as Web server, MAIL server, content server are formed the ICP environment.
According to above-mentioned wide band multi media service system, it is characterized in that: the trunk switching network comprises ATM switch and public exchange, use optical fiber transmission network between public exchange and the public exchange, link together by optical fiber, adopt ATM OC-3 and ATM OC-12, transmission meanss such as wavelength division multiplexing provide enough bandwidth and loose access way.
Wide band multi media service system according to above-mentioned is characterized in that: broadband access network is made of access device and central office terminal's building coil holder; Link to each other with the backbone network ATM switch by Ethernet interface or atm interface, insert this local side equipment at the front end of telephone exchange (PBX), local side apparatus is connected with user side by telephone wire, forms the user of access network cyclic system; Local side and user side are point-to-point mode; User side can connect various terminal equipments.
Figure (1) is the main assembly block diagram according to wide band multi media service system of the present invention.
Figure (2) is the fundamental diagram according to the center website of wide band multi media service system of the present invention.
Figure (3) is the fundamental diagram according to the trunk switching network of wide band multi media service system of the present invention.
Figure (4) is the fundamental diagram according to the broadband access network of wide band multi media service system of the present invention
Figure (5) is the overall work schematic diagram according to wide band multi media service system of the present invention.
Below in conjunction with accompanying drawing specific embodiments of the invention are described.
Figure (1) is the wide band multi media service system composition frame chart, and this system is made up of center website 1, trunk switching network 2, broadband access network (local side, user side) 3.Center website 1, trunk switching network 2, Access Network 3 are realized being communicated with by transmission mediums such as optical fiber.Local side, the user side of Access Network 3 are communicated with by twisted-pair feeder.
The broadband multi-media service system forms broadband and inserts on the basis that does not change the conventional communication networks framework, avoided the transformation of repeated communication network on the one hand, and level and smooth upgrading, update mechanism is provided on the other hand.
Center website 1 outreaches Internet 7, and transfer of data is based on telecommunications trunk switching network 2, to form the trunk switched transport network.Broadband access network 3 links with public telephone network (PSTN) 8, is connected with user side modulator-demodulator 4 by twisted-pair feeder, and modulator-demodulator 4 is connected with set-top box 5 or other terminal equipment again.Broadband access network 3 is connected with trunk switching network 2 can adopt existing telecommunications broadband services interface.
(1) the trunk switching network is to adopt the fiber optic network of technology such as IP Over ATM or IP Over WDM to realize wideband transmit.Speed is fast, extendible, support multi-service, be satisfied with bandwidth applications.
(2) broadband access network adopts a kind of digital subscriber loop systems ether loop based on ethernet standard of novel high speed, realizes the high speed copper wire access.The transmission and the cross interference environment that can adapt to continuous variation, power be-28dBm is to 14dBm.Adopt three parameters: baud rate, node number, through-put power.Can be when uplink and downlink moment reach high speed.Adopt point-to-point mode.Extraordinaryly solved the transmission problem of last kilometer in the communication network.The transmission rate of user side to local side bi-directional symmetrical 4Mbps even 10Mbps can be provided, and except satisfying the transmission of user side 4Mbps to the 6Mbps video flowing, remaining bandwidth can be applicable to other Internet service.
The ether loop can transmit may comprising on the local loop cable of other system: plain old telephone service system (POTS), integrated service digits subscriber's line, high-bit-rate digital subscriber line road (HDSL), T1 line and asymmetry Digital Subscriber Loop (ADSL).The ether loop has the ability that keeps spectral compatibility with all these services.
The ether loop can transmit the signal of many different qualities or baud rate, and each speed segment signal can be supported the modulation of 3 different brackets, allows to exist different transmission bit rates thus.In addition, the ether loop can be adjusted own through-put power, avoid the cross interference to other service generation from 14dBm to-28dBm according to the state of loop.
On the positioner of T1 maximum magnitude, in office how too on loop speed and the energy, T1 demonstrates the tolerance limit greater than 6dB, so unless by inappropriate design, T1 can not have impairment in the ether loop.
Find out that equally the ether loop can keep spectral compatibility with ADSL.Up ADSL is never limited by the ether loop and is less than target bit rate: CSA test loop 640kbps, RRD scope (T1.601) test loop 160kbps.
Descending ADSL should be able to transmit 6144kbps on the CSA test loop, transmit 1696kbps on RRD scope T1.601 test loop.The result here show all ether loop baud rates be equal to or less than 179kbaud on all RRD scope T1.601 test loops, reach the target of 1696kbps.In sum, the ether loop can keep spectral compatibility with ADSL.The ether loop has a kind of intrinsic spectral compatibility ability.The ether loop equals a low number dBm/Hz on higher ether loop speed only transmitting on the ceiling capacity level of 14dBm.The ether loop on any speed or energy always with ISDN, HDSL and the T1 compatibility of on critical field length, operating.So, if ether loop and descending ADSL (use high-frequency) are incompatible, the ether loop also needn't worry for ISDN, the compatibility of HDSL and T1 line and change oneself frequency spectrum and energy.The highest 4kHz that expands to of POTS frequency.Minimum ether loop band connection frequency is 31kHz, comprises exceeding the minimum that bandwidth reaches 22kHz.This has stayed enough guard bands (frequency band) with regard to sharing with POTS with a pair of cable for the ether loop.Cable can be shared with POTS by good explanation by the ADSL system under littler guard band.So there is not any problem in the ether loop.Ether loop and POTS can well be compatible under the condition of good filtration.
Central site network links to each other with the trunk switching network by optical fiber, the trunk switching network links to each other with broadband access network by optical fiber, user side is connected dependence copper telephone wire with broadband access network, forming broadband on the basis that does not change the conventional communication networks framework inserts, in the limited distance scope (in the sub-district, sub-district and minizone, city and city are between city and city) by multimedia transmission and application on the network implementation existing network.
(3) central site network is exchanges data, processing, the transmission of IP value-added service, the center of control.The video server of serving order of magnitude user is arranged, and the equipment of gathering and editing, memory device, central site network form unique video service system.The centralized management database, charge system, network management system, based on the ICP environment of Internet service, and other type application server.Video service system be mainly used in to numeral and non-numeric signal source (program) handle, suppress, gather and edit, storage, real-time video order program service; To whole network real-time monitoring and valuation charge; And outreach Internet.
Video server: the equipment of gathering and editing, memory device adopt MPEG over UDP/IP technology, the MPEG-2 compression standard, and decompression/compression all reaches 4Mbps to 6Mbps, meets the international standard of high-definition screen, beautiful audio fruit.Video server provides multiple module interface (100baseT Ethernet interface, ATM OC-3 (155M), ATMOC-12 (622M) interface).Employing parallel processing mechanism, hypercube CPU framework, eliminated the bottleneck between cpu bus, internal memory, the I/O, guarantee that audio, video data can the multi-user concurrent program request, the video database platform is the management server hardware resource effectively, and carry out the Video service system of multiple mode, as real-time storage, play in real time, regularly play, click, broadcasting, interactive visit.
(4) ustomer premises access equipment is made up of modulator-demodulator, set-top box (STB, Set Top Box) and television set or other PC class non-PC terminal equipment, and receiving digital signals and video multimedia signal send individual's request.Ustomer premises access equipment adopts MPEG-2 decoder chips, many application systems operating system.Comprise video request program, IP network value-added service, as: IP Phone, Video Phone, video conference, network gaming, Internet access etc.
Figure (2) is the fundamental diagram of center website.Center website adopts traditional ethernet network scheme, it comprises: charge system 13, network management system 17, ICP application server cluster (Web server 10, ftp server 12, Mail server 11, content server 14 etc.) and video service system 18, and by 100Mbit/s or gigabit switching Ethernet switch 110 mutual UNICOMs.Outlet inserts Internet at a high speed by fire compartment wall 15 and router one 6.And access ATM switch 100 is communicated with the trunk switching network.Servers such as WEB server, MAIL server, content server are formed the ICP environment, and charge system, fire compartment wall utilize the ether switch to be communicated with each other.Fire compartment wall and router link, and insert Internet by router.The equipment of gathering and editing in real time directly is communicated with video server.Network management system, another equipment of gathering and editing are communicated with video server by ATM switch.The ether switch directly is communicated with ATM switch, realized between each server, and between each system, the connection of fire compartment wall.Central site network has realized between each server, the effective centre management mechanism of each controlling platform.
Figure (3) is the fundamental diagram of trunk switching network.The trunk switching network is linked together central network and Access Network, it comprises ATM switch 21,24 and public exchange 22,23 (what promptly adopt is IP Over ATM switch), use optical fiber transmission network 25 between switch 21 and the switch 24, link together by optical fiber, adopt ATM OC-3 and ATM OC-12, transmission meanss such as wavelength division multiplexing provide enough bandwidth and loose access way.
Figure (4) is the fundamental diagram of Access Network.Access Network is made of access device 31 and central office terminal's building coil holder 33.Link to each other with backbone network ATM switch 24 by Ethernet interface or atm interface, insert this local side equipment at the front end of telephone exchange (PBX) 34, local side apparatus is connected with user side by telephone wire, forms the user of access network cyclic system.Local side and user side are point-to-point mode.User side can connect various terminal equipments.
ATM switch and access device link.Access device and telephone exchange, local side coil holder link, and are connected into public telephone network by telephone exchange.Local side coil holder 33 is connected with user side modulator-demodulator 4, and modulator-demodulator 4 is connected with set-top box 5, and set-top box 5 links with television set 6 or other terminal equipment.
Figure (5) is the entire system fundamental diagram.
Central network, high-speed access network, trunk switching network three realize high speed UNICOM, and framework is on the conventional communication networks circuit.Because customer access equipment has been used the ether loop technology in the high-speed access network, reaches/the descending 4mbps-10mbps of being in transmission rate on the copper twisted-pair feeder.Not only satisfy the required bandwidth of video flowing, and also had remaining bandwidth.
The user only uses telephone wire is connected into modulator-demodulator, inserts set-top box (STB) by modulator-demodulator, is connected on the coil holder by telephone wire, enters customer access equipment thus, enters ATM switch through Ethernet interface or atm interface; Local side apparatus is discerned voice, multi-media signal automatically, user's request is separated with normal voice.Voice signal goes to public telephone network (PSTN), and user's request is transferred to center website through the trunk switching network, in the actual request of center website process user.Charge system is the identity of authenticated user at first, behind the confirm, and this user each service system of being allowed for access.If the user enters video service system, this system provides service according to user instruction.If the user enters the Internet service system, directly enter Internet by this system user.
Access device adopts the ether loop technology.The ether loop is a new technology in conjunction with some new ideas, and the ether loop can transmit may comprising on the local loop cable of other system, can not produce cross interference to other type xDSL that exists in same cable.By adjusting transmission frequency and power to avoid producing cross interference ability to other service.Have one to spectral compatibility.The ether loop can transmit the signal of many different qualities or baud rate, and each speed segment signal can be supported the modulation of 3 different brackets, allows to exist different transmission bit rates thus.In addition, the ether loop can be adjusted the transmission power level of oneself from 14dBm to-28dBm according to the state of loop.To inquire into the transmission parameter of bit rate, frequency band and other analogue loops at this.Up (from user to the local side (CO)) and descending (CO is to the user) passage are all used i.e. 30% the additional bandwidth of raised root cosine that has bandwidth.An ether loop signals has a pass band width that equals baud rate, and 30% additional bandwidth is with initial 1.3 times of expanding to former baud rate to cut-off frequency.Carrier frequencies equals baud rate, makes a transponder and a simple high performance modulator-demodulator use jointly.In addition, each ether loop speed is supported a kind of in 3 kinds of phase shift Modulation and Amplitude Modulation (QAM): QPSK, 16-QAM or 64-QAM.But the ether loop is normally noncoding, so transmission rate is generally equal to data transfer rate.Present public telephone and digital network have about 60,000 ten thousand copper cash, the ether loop technology provide one strong, joint letter, utilize telephone network to satisfy the solution of user to video/digital service demand.Here it is uses " burst packets " technology.Single frequency spectrum bi-directional data burst packets mode is transmitted data and keep the static symmetry of transmitting flexibly between each burst, and height adaptive carries out error correcting by transmitting again.And between modulation and signal transfer rate, keep balance, the transfer of data that can obtain to optimize.So the ether loop can be transformed into Ethernet with telephone network, realize local side, user side is communicated by letter in point-to-point mode, and on each individuality (user), the ether loop all has high-adaptability, can reach the maximum transmission rate of self supporting rapidly.Make each user exclusively enjoy bandwidth (4Mbps-10mbps).Like this, the ether technology gives public telephone network a new life, that is: make it have the ability to load simultaneously video and digital signal, and its property simplified and high speed all are unprecedented.
User request signal enters modulator-demodulator by set-top box, and (4Mbps-10Mbps) enters coil holder through twisted-pair feeder; Enter access device by twisted-pair feeder again.Access device is discerned voice, multi-media signal automatically, with user request signal and normal voice Signal Separation.Voice signal goes to public telephone network (PSTN).The public exchange of user request signal by telecommunications trunk switched transport network delivered to other end public exchange with user request signal and entered ATM switch by optical fiber again and enter the ether switch through twisted-pair feeder.Central site network charge system, network management system provide the operation of user's request management, exchanges data, control overall network.Be Video service as user's request, then the user enters video service system, and this system provides service according to user instruction.Video server provides the Moving Picture Experts Group-2 data flow by trunk switched transport network, Access Network, finally arrives user side.User side, decompresses to video flow processing with set-top box, passes to television set again.As local loop is other data-signal.Can be handled by terminal equipments such as television set, computers at user side.Central site network provides Internet interface and local ICP service system, and user request signal is through fire compartment wall, and router enters Internet and the internet safe guarantee can be provided.Also can directly visit the ICP environment of native system.The direct received signal of the real-time collecting and editing system of Video service, instant compiling deposits video server and other memory devices in real time in.This locality equipment of gathering and editing imports signal into video server and other memory devices by ATM switch.The ether loop is based on the Ethernet of telephone wire, need not recombinate, and utilizes existing copper twisted pair that telephone network is become Ethernet.
In the following aspects its significant superiority is arranged according to wideband multimedia communication service system of the present invention:
Its core switching network adopts the fiber optic network of (IP Over ATM or IP Over WDM) technology to realize wideband transmit.
Realized being independent of each other between telephone service and the data service.
Use the ether loop technology, point-to-point mode and hub-and-spoke configuration are realized the transmission rate of the 4mbps-10mbps of uplink and downlink.Promptly give the different bandwidth of user to the different demand assignment of bandwidth according to the user.Thereby solved the access network technology problem of " last kilometer " smoothly.
Diversified network multimedia service is provided, and can inserts Internet.Compare with existing Internet technology, its access and transmission all are higher rates.
Utilize the most universal existing resource, improve transmission rate, realize that the broadband high speed of common copper twisted-pair feeder inserts, finish black phone and combine for the data network on basis with packetizing ATM/IP.
Claims (4)
1, a kind of wide band multi media service system, this system is made up of center website (1), trunk switching network (2), broadband access network (3); It is characterized in that: center website (1), trunk switching network (2), broadband access network (3) are realized being communicated with by transmission mediums such as optical fiber; The local side and the user side of broadband access network (3) are communicated with by twisted-pair feeder; Center website (1) outreaches Internet (7), and transfer of data is based on telecommunications trunk switching network (2), to form the trunk switched transport network; Broadband access network (3) links with public telephone network (8), is connected with user side modulator-demodulator (4) by twisted-pair feeder, and modulator-demodulator (4) is connected with set-top box (5) or other terminal equipment again.
2, according to the wide band multi media service system of claim 1, it is characterized in that: center website comprises: charge system (13), network management system (17), Web server (10), ftp server (12), Mail server (11), content server (14) and video service system (18), by the mutual UNICOM of Ethernet switch (110); Outlet inserts Internet (7) at a high speed by fire compartment wall (15) and router (16); And access ATM switch (100) is communicated with the trunk switching network; Web server (10), MAIL server (11), content server servers such as (14) are formed the ICP environment.
3, according to the wide band multi media service system of claim 1, it is characterized in that: the trunk switching network comprises ATM switch (21,24) and public exchange (22,23), use optical fiber transmission network (25) between public exchange (21) and the public exchange (24), link together by optical fiber, adopt transmission meanss such as ATM, wavelength division multiplexing that enough bandwidth and loose access way are provided.
4, according to the wide band multi media service system of claim 1, it is characterized in that: broadband access network (3) is made of access device (31), central office terminal's building coil holder (33) and user side; Link to each other with backbone network ATM switch (24) by Ethernet interface or atm interface, insert this local side equipment at the front end of telephone exchange (PBX) (34), local side apparatus is connected with user side by telephone wire, forms the user of access network cyclic system; Local side and user side are point-to-point mode; User side can connect various terminal equipments.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99121988 CN1095617C (en) | 1999-10-25 | 1999-10-25 | Wide band multi media service system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99121988 CN1095617C (en) | 1999-10-25 | 1999-10-25 | Wide band multi media service system |
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| CN1259812A true CN1259812A (en) | 2000-07-12 |
| CN1095617C CN1095617C (en) | 2002-12-04 |
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| CN1558659B (en) * | 2004-02-11 | 2010-09-01 | 中国电信股份有限公司 | Message providing system and message providing method for implementing multimedia message service in fixed telephone network |
| CN100379196C (en) * | 2005-01-10 | 2008-04-02 | 中国科学技术大学 | Automatic switching optical network based real-time media data transmission system and method |
| CN100464512C (en) * | 2006-11-21 | 2009-02-25 | 金纯� | Two-way incremental service realizing method based on digital TV one-way set-top box |
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