CN101511043A - Synthesis business networking method based on HFC broadband network, and synthesis business optical station equipment - Google Patents
Synthesis business networking method based on HFC broadband network, and synthesis business optical station equipment Download PDFInfo
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Abstract
The invention discloses an integrated service network deployment method based on HFC brand band network and a special equipment - an integrated service light station equipment. A traditional CMTS, a RF signal photoelectric converter and a data signal photoelectric converter are integrated as a whole for forming an integrated service light station that is installed on a light node of HFC for realizing photoelectric convert of the television signal and IP data signal simultaneously, and transmitting IP data packet. The equipment also has a remote monitor function for realizing centralized monitoring and managing each integrated service light station equipment and the loaded brand bane user distributed arrangement. Compared with the prior art, the method and the equipment provided by the invention has advantages of reducing filler noise disturbance, increasing average family brand band of the user, simplifying the network structure, reducing network deployment cost and easy to maintenance.
Description
Technical field
The present invention relates to integrated service cut-in method and equipment based on broadcasting and TV HFC net, be specifically related to a kind of cable TV network optical node place that is installed on, be used for the integrated service light station of cable TV network TV signal opto-electronic conversion and IP wideband data opto-electronic conversion and data forwarding.
Background technology
Cable TV network adopts the network configuration form of HFC (Hybrid Fiber Coaxial).The cable TV network broadband technology is meant based on the hfc plant structure, adopt DOCSIS (Data Over Cable Service InterfaceSpecification) standard, use CM (Cable Modem cable modem), CMTS equipment such as (Cable ModemTermination System cable modem CMTSs) that the internet is inserted in the HFC cable TV network, thereby a technology of broadband network services is provided to the cable TV network user.HFC is made up of headend room, fiber optic backbone and coaxial cable distribution net three parts usually.The Headend machine room mixes numerous TV signal after treatment, converts light signal again to and carries out long-distance transmissions by fiber optic backbone, arrived the user area after, carry out opto-electronic conversion again, this point is called as " optical node ".The rf signal that conversion is come out is delivered to huge numbers of families by coaxial cable after amplifying, distributing.The DOCSIS standard is meant the interface specification that is applied to HFC net transmitting data service, and how definition provides bi-directional data traffic by the cable modem, is supported in the transmission that realizes the IP packet between computer network and cable television network front end and the user.CMTS belongs to head end (local side) equipment, is deployed in the front end of cable TV network usually, and its core component comprises modulation feature board and 10G CPU Control Unit.It has FPDP and prevention at radio-frequency port, connects Internet and HFC net respectively.CMTS receives the modulation signal of sending from user side CM (being called upward signal), demodulates IP packet wherein, and is forwarded to Internet according to destination address; Simultaneously, the CMTS data-signal that also will come from Internet (is called downstream signal) and sends to the CM of user side after modulating.CMTS plays the bridge transformation between data network and HFC net.CM is as ustomer premises access equipment, between the terminal prot and user side CPE (Customer Premises Equipment) equipment of HFC net.CPE can be a PC, also can be interactive set-top box, IP phone machine etc.
Existing cable TV network broadband access scheme is CMTS to be concentrated be deployed in the headend room, as shown in Figure 1.This cut-in method is carried out the data service initial stage in operator and is fine, and can cover whole network in the short time, but drawback also is clearly, mainly has the problem of following several respects:
1, " funnel noise " serious interference
Because the CMTS in the headend room need cover several to tens optical nodes, number of users reaches several thousand even several ten thousand families, come from the rf inputs that various noise signals in transmission line and the user family can be converged to CMTS by data feedback channel, industry is referred to as " funnel noise ".The funnel noise has 70% to be various household electrical appliance or the space radiation that comes from the user family, and the number of users that CMTS covers is many more, and " funnel " is big more, and the funnel noise is also big more.When this noise collection effect to one higher level, will influence the stability of CMTS work, can't proper communication when serious.
2, bandwidth resources are low per family
Will cover a lot of users owing to be deployed in the CMTS of headend room, along with the increase of broadband user's networking rate, the bandwidth resources that obtain per family will be more and more littler, be difficult to satisfy user's online demand.
3, the complicated network structure, the networking cost height
Network configuration is comparatively complicated as can be seen from Fig. 1, and the network path from user side CM to the headend room data switching exchane is:
CM---cable distribution network---optical node (optical workstation contains the emission of descending light-receiving and up light)---optical fiber---passback optical receiver and descending optical sender---CMTS---switch.
Each optical node all needs to install optical workstation, and up optical receiver is installed in that headend room is will be with it corresponding, this make each optical node bidirectional rebuilding only equipment cost will reach 5000～8000 yuan.For satisfying each Internet user's bandwidth demand, at headend room a large amount of CMTS equipment will be installed also, and the CMTS equipment price that machine room uses is generally at 10～200,000 yuan.So, the construction cost of cable TV broadband network just is in higher state.
Summary of the invention
At the prior art above shortcomings, the purpose of this invention is to provide a kind of funnel noise jamming that can reduce the HFC broadband network, improve bandwidth, simplification network configuration, reduction networking cost per family, integrated service cut-in method and the integrated service light station that are easy to safeguard based on the HFC broadband network.
For achieving the above object, the present invention has adopted following technical scheme:
Integrated service network-building method based on the HFC broadband network, after being traditional CMTS and traditional optical receiver and optical transceiver (or 0NU) become one, its characteristics directly are arranged at the optical node place of HFC system, realize the opto-electronic conversion of TV and IP data simultaneously at the optical node place, produced a kind of new network equipment thus---and integrated service light station (Integrated Service Optical Node, ISON).Further optimization as the technical program, adopted the method that remote monitoring module is set in inside, integrated service light station, be implemented in headend room centralized monitor management and be distributed in HFC and net the integrated service optical station equipment of each optical node and the broadband user of institute's load thereof.
Wherein, the integrated service light station that traditional CMTS and traditional optical receiver and IP optical transceiver (or ONU) are become one and form, based on the DICSIS agreement, utilize ETX modularization CPU and CMTS core component modulation mediation function plate to carry out integrated design, realization is finished opto-electronic conversion with TV signal and IP uniform data, is blended in the coaxial cable after dealing with separately and transmits.
A kind of integrated service optical station equipment, its characteristics be, comprises casing, is positioned at the integration module and the interface of casing; Described integration module is integrated with CMTS functional module, radiofrequency signal photoelectric converting function module and IP data photoelectricity conversion functional module; Described interface comprises the input interface of being made up of TV optical interface and IP data light interface, and the coaxial cable radio frequency output interface; Wherein, the TV optical interface links to each other with radiofrequency signal photoelectric converting function module; Radiofrequency signal photoelectric converting function module is used for the TV light signal is converted to the signal of telecommunication; IP data light interface links to each other with IP data photoelectricity conversion functional module; IP data photoelectricity conversion functional module is used for the opto-electronic conversion of IP packet, and links to each other with the data port of CMTS functional module; The CMTS functional module be used for the IP data-signal modulation, separate and be in harmonious proportion to transmit; The radio frequency of CMTS functional module divides uplink and downlink two passages, wherein down going channel reaches blender with modulated I P data-signal and mixes with the TV signal after opto-electronic conversion, and mixed signal is again through exporting from duplexer filter after balanced, distribution and the processing and amplifying; Data feedback channel links to each other with duplexer filter, be used for and take out and to deliver to CMTS from the upward signal of user side from duplexer filter, deliver to data-signal photoelectric converting function module after the processing such as CMTS is tuning with this upward signal process, amplification, demodulation and be converted into light signal, finally send to IP backbone.
Adopt the inventive method and equipment, the structure of HFC broadband network is simplified, as shown in Figure 2.Path, networking from user side CM to the headend room data switching exchane is:
CM---cable distribution network---integrated service light station---optical fiber---machine room light end equipment---switch.
The formed cable TV network broadband access equipment of the present invention---integrated service light station except having traditional television transmission optical receiver function, can also receive and transmit the IP data, finishes the transmission of hfc plant integrated service signal.
Compared to existing technology, the present invention has following advantage:
1, having reduced " funnel noise " disturbs:
Function with CMTS among the present invention places each optical node place, and coverage has only tens to several one hundred houses, reduces greatly from the funnel noise of hfc plant, makes that the work of CMTS module is more stable.Simultaneously, even the proper communication that also is unlikely to have influence on other sections user is disturbed in a section, make the whole system antijamming capability strengthen greatly.
2, bandwidth increases per family:
Because the use of the technology of the present invention makes that the bandwidth resources of fiber optic backbone are brought into play, the number of users that integrated service light station covers under the optical node has only tens to several one hundred houses, and therefore the data bandwidth that obtains per family improves greatly.
3, simplify the structure of HFC broadband network, reduced networking cost:
Because modularized design has been adopted at integrated service light station, CMTS has adopted integrated design, makes that the overall cost of equipment is lower many than traditional CMTS equipment; Simultaneously, because network configuration is simplified, the optical workstation and the up optical receiver (about 5000～8000 yuan of each optical node) that must use in the traditional scheme have been saved.Therefore, under equal total bandwidth condition, use technical solution of the present invention and equipment can reduce networking cost greatly.
4, safeguard that simply coverage is little during fault, and locate easily:
Owing to adopted the remote centralized control administrative skill in the integrated service light station, made the technical staff can understand equipment running status in real time, configuration parameter, leading subscriber.Also designed fault alarm function in the management software.
Description of drawings
Fig. 1 is existing HFC broadband network network-building method network topological diagram;
Fig. 2 is for adopting the network topological diagram of the integrated service network-building method based on the HFC broadband network of the present invention;
Fig. 3 is the internal circuit module map of integrated service optical station equipment among the present invention.
Fig. 4 is the inside theory diagram of CMTS module among the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail:
A kind of integrated service network-building method based on the HFC broadband network, traditional CMTS, radiofrequency signal optical-electrical converter and data-signal optical-electrical converter are become one, become integrated service light station, be installed on the optical node place of HFC, realizing the opto-electronic conversion of TV signal and IP data-signal simultaneously, and the forwarding of IP packet.This equipment also has remote monitoring function, is implemented in each integrated service optical station equipment of the managing distributed deployment of headend room centralized monitor and the broadband user of institute's load thereof.
As shown in Figure 2, Headend and data center were two unrelated machine rooms originally, and the Optical Fiber Transmission by is separately mixed after opto-electronic conversion separately to optical node, utilizes the cable distribution network of HFC to be transferred to huge numbers of families.The bandwidth that can guarantee data backbone network part like this is not fully exerted.At equipment of the present invention---in the integrated service light station, TV signal becomes radiofrequency signal after opto-electronic conversion, is sent to each user by cable distribution network after amplifying.The data light signal becomes digital pulse signal after opto-electronic conversion, wherein comprise to receive and the transmission two-way.This digital signal process CMTS module is modulated, demodulation, makes the digital signal of sending and receiving become analog signal so that transmit in cable.Cable distribution network adopt the mode of frequency division be divided into data feedback channel (5～65MHz) with down going channel (88～860MHz), the CMTS module carries out the digital signal that will send to send into down going channel after the QAM modulation, and together enters cable distribution network after TV signal is mixed; Simultaneously, the cable distribution network data feedback channel has that (content of modulation comes from the data of CPE from the modulation signal of user side CM, as PC etc.), leach after the CMTS module is carried out demodulation by duplexer filter, restore users'data signals, through opto-electronic conversion, reach switch by optical fiber and enter Internet again.Like this, the access task of HFC broadband network is accomplished, and has realized the comprehensive transmission of TV and broadband data service.
The operation principle at integrated service light station: the effect at integrated service light station is the unified opto-electronic conversion that realizes TV and data light signal, and data radiofrequency signal with TV after modulation or demodulation process is blended in transmission in the cable.This equipment has TV and two optical interfaces of data, two prevention at radio-frequency port.Its theory diagram is seen Fig. 3, Fig. 4.
Fig. 3 is the internal circuit module map of cable TV network broadband access equipment among the present invention.This device assumes the task of opto-electronic conversion, has wherein both comprised TV signal, comprises the IP data-signal again.The former carries out opto-electronic conversion by the photoelectric converting function module, the latter realizes opto-electronic conversion by data photoelectricity conversion functional module, finish modulation, demodulation and the forwarding of data-signal by the CMTS module, it can be transmitted in cable system, and final two kinds of signals of telecommunication mix after coaxial cable arrives each user.Specifically, this equipment comprises casing, is positioned at the integration module and the interface of casing; Described integration module is integrated with CMTS functional module, radiofrequency signal photoelectric converting function module and IP data photoelectricity conversion functional module; Described interface comprises the input interface of being made up of TV optical interface and IP data light interface, and the coaxial cable radio frequency output interface; Wherein, the TV optical interface links to each other with the light-receiving functional module; Radiofrequency signal photoelectric converting function module is used for the TV light signal is converted to electrical signal; IP data light interface links to each other with IP data photoelectricity conversion functional module; IP data photoelectricity conversion functional module is used for the opto-electronic conversion of IP packet, and links to each other with the data port of CMTS functional module; The CMTS functional module be used for the IP data-signal modulation, separate and be in harmonious proportion to transmit; The radio frequency of CMTS functional module divides uplink and downlink two passages, wherein down going channel reaches blender with modulated I P data-signal and mixes with the TV signal after opto-electronic conversion, and mixed signal is again through exporting from duplexer filter after balanced, distribution and the processing and amplifying; Data feedback channel links to each other with duplexer filter, be used for and take out and to deliver to CMTS from the upward signal of user side from duplexer filter, deliver to data-signal photoelectric converting function module after the processing such as CMTS is tuning with this upward signal process, amplification, demodulation and be converted into light signal, finally send to IP backbone.
Fig. 4 is the theory diagram of CMTS module.The basic role of CMTS exactly to data-signal modulate, demodulation so that can transmission in HFC net.The present course of work of explaining CMTS from the reception and the process of transmitting of data: according to the DOCSIS agreement, the data-signal that sends from user's PC network interface card enters CM, through becoming bandwidth after QPSK (or QAM) modulation is that the upward signal that 0.2～6.4MHz does not wait enters the data feedback channel (5～65MHz) that HFC nets, in integrated service light station, isolate this signal by duplexer filter, give CMTS, amplify earlier, tuning, carry out demodulation after the processing such as filtering, the packet that demodulation is come out is delivered to the core of CMTS again---DOCSIS MAC process chip, determine the whereabouts of this packet by it: through pci bus to CPU, arrive the 100M Ethernet card, linking to each other with optical transceiver reaches Internet; Or pass to other CM via down going channel.And the data that come from Internet are converted to the Ethernet signal of telecommunication through optical transceiver module (or ONU), deliver to CPU after the 100M Ethernet card receives, and are connected with DOCSIS MAC chip through pci bus again.Under the control of CPU, the MAC chip is delivered to descending modulation chip with this packet, output intermediate-freuqncy signal after the QAM modulation, any one bandwidth that is converted in 88～860MHz after filtering again, the amplification is the radiofrequency signal of 8MHz (or 6MHz), with mix mutually from the radio television signal after the opto-electronic conversion, from the front end input of duplexer filter, insert the cable distribution network of HFC from common port output.User side CM receives behind this downstream signal demodulation and replys packet, is linked into PC from the network interface card interface of CM.So just finished from user's PC and sent data to Internet, receive from the whole communication process of the data of Internet again.
For realizing above-mentioned inventive method, producing integrated service light station is prerequisite.This equipment needs can adapt to installation and work in the field, and when finishing TV signal and IP data-signal opto-electronic conversion, also wanting can be by remote monitoring, management.This will carry out modularized design with CMTS earlier, and TV signal light-receiving functional module, IP data light transmission-receiving function module, remote monitoring module etc. are integrated in the casing of water-proof sealing, adopt no fan heat dissipation design.Inner integrated radiofrequency signal photoelectric conversion module and IP data photoelectricity conversion functional module is detachable, that is the user can the selective light interface, also can select electrical interface; The electrical interface of TV signal is a F type radio frequency socket, and the electrical interface of data-signal is the RJ45 socket.
1. make the CMTS modularization
For realizing the CMTS modularization, adopted ETX CPU module among the present invention.ETX is a kind of CPU template of microminiaturization, is that embedded-type control field obtains one of standard of applying in recent years.The ETX module is integrated central processing unit, memory interface, demonstration, network interface, USB and standard I/O function etc. on the 95x114mm size, and the high-density connector by 4 100pin is connected with support plate.Such design makes that its expansion is more flexible, and system upgrade is also easy, and reduces the cable connection to greatest extent.The X86 framework of ETX can satisfy requirement of the present invention fully.Because this template adopted standard interface, the design of the support plate of CPU is also than being easier to, and can simultaneously the modulation feature board be designed with it on a pcb board, makes independently CMTS module, realizes integrated.In addition, adopt the ETX stay in place form, can select CPU low in energy consumption, help reducing the power consumption of complete machine.When carrying out integrated design, the wiring of pcb board will notice that the PCI lead-foot-line of ETX Connection Block should follow isometric principle, and analog circuit ground wire and digital circuit ground wire are separated, and reduces and disturbs.
2. the design of remote monitoring module
The parameter of remote monitoring is main supply power voltage, cabinet inside temperature, optical signal power, radiofrequency signal power, the CM operating state in the machine, the parameter of controlling is the restarting of setting, complete machine of adjustment, the CMTS downstream signal frequencies of radiofrequency signal power, and the parameter that dispose mainly is mandate, fault alarm thresholding of mode of operation, the CM of CMTS or the like.All monitor datas are transferred to headend room with the form of IP packet by data optical fiber, under the webmastering software interface, realize to all integrated service light stations in netting and with user's centralized monitor, management.
3. integrated each functional module
In the integrated casing that is installed in airtight waterproof such as CMTS module, TV light-receiving functional module, IP data light transmission-receiving function module, remote monitoring module and power supply.Wherein TV light-receiving functional module is the core component of traditional optical receiver; IP data photoelectricity conversion functional module is an Ethernet optical transmit-receive function module, or ONU functional module (OpticalNetwork Unit); Both but first line of a couplet fiber optic Ethernet also can connect EPON (Ethenet Passive Optical Network).Both all are matured products, can be supporting by purchasing, and be one with CMTS module collection again.
4. heat dissipation design
At first be that circuit design stage just runs through the thought that reduces power consumption, reduce the generation of heat, select the low-power consumption chip.Aspect heat radiation, utilize the aluminum alloy heat sink section bar to make the airtight waterproof casing, heating column is installed in the relevant position at the bottom of shell, directly passes to whole housing with the heat that the heater members on the circuit board is produced, to reach the purpose of quick heat radiating.
5. software design
The operating software of equipment is the remote monitoring function that increases on the basis of the existing product JH-HE2086 of our company equipment, the control interface of integrating monitoring module on the basis of existing webmastering software JH-NMSv3.3, make the network manager in the distance machine room can control the working condition of each equipment and broadband user's CM operating state.The remote monitoring and administration module has adopted based on SNMP standard network management protocol.
The integration module that its characteristics are to comprise casing, interface and are positioned at casing.Described integration module has comprised CMTS function, TV signal photoelectric converting function, IP data photoelectric converting function, remote monitoring function.And it is target that this equipment is installed and used with the field, takes not have the fan design, by airtight casing heat radiation.This equipment is to design based on same goal of the invention with said method, and equipment and method belong to same technical scheme, can see an integral body of tight contact.Integrated service light station has TV signal optical interface, IP data-signal optical interface and radio frequency interface, and optical interface wherein connects the backbone network of TV and data respectively, and radio frequency interface connects coaxial cable distribution net.Use the Cable Modem online of standard at user terminal.But equipment remote monitoring, management, installation and maintenance is very convenient.
Claims (6)
1, a kind of integrated service network-building method based on the HFC broadband network, it is characterized in that, CMTS, radiofrequency signal optical-electrical converter and data-signal optical-electrical converter are become one, become the integrated service optical station equipment, be installed on the optical node place of HFC, realizing the opto-electronic conversion of TV signal and IP data-signal simultaneously, and the forwarding of IP packet.
2, the integrated service network-building method based on the HFC broadband network as claimed in claim 1, it is characterized in that, the place is provided with remote monitoring module at optical node, is implemented in headend room centralized monitor management and is distributed in HFC and nets the integrated service optical station equipment of each optical node and the broadband user of institute's load thereof.
3, a kind of integrated service optical station equipment is characterized in that, comprises casing, is positioned at the integration module and the interface of casing; Described integration module is integrated with CMTS functional module, radiofrequency signal photoelectric converting function module and IP data photoelectricity conversion functional module; Described interface comprises the input interface of being made up of TV optical interface and IP data light interface, and the coaxial cable radio frequency output interface; Wherein, the TV optical interface links to each other with radiofrequency signal photoelectric converting function module; Radiofrequency signal photoelectric converting function module is used for the TV light signal is converted to the signal of telecommunication; IP data light interface links to each other with IP data photoelectricity conversion functional module; IP data photoelectricity conversion functional module is used for the opto-electronic conversion of IP packet, and links to each other with the data port of CMTS functional module; The CMTS functional module be used for the IP data-signal modulation, separate and be in harmonious proportion to transmit; The radio frequency of CMTS functional module divides uplink and downlink two passages, wherein down going channel reaches blender with modulated I P data-signal and mixes with the TV signal after opto-electronic conversion, and mixed signal is again through exporting from duplexer filter after balanced, distribution and the processing and amplifying; Data feedback channel links to each other with duplexer filter, be used for and take out and to deliver to CMTS from the upward signal of user side from duplexer filter, deliver to data-signal photoelectric converting function module after the processing such as CMTS is tuning with this upward signal process, amplification, demodulation and be converted into light signal, finally send to IP backbone.
4, integrated service optical station equipment as claimed in claim 3 is characterized in that, radiofrequency signal photoelectric conversion module that described inside is integrated and IP data photoelectricity conversion functional module are detachable, that is the user can the selective light interface, also can select electrical interface; The electrical interface of TV signal is a F type radio frequency socket, and the electrical interface of data-signal is the RJ45 socket.
5, integrated service optical station equipment as claimed in claim 3 is characterized in that, described IP data photoelectricity conversion functional module is an Ethernet optical transmit-receive function module, or the ONU functional module; Both but first line of a couplet fiber optic Ethernet also can connect EPON.
6, integrated service optical station equipment as claimed in claim 3 is characterized in that, described casing has adopted the water-proof sealing structure and from radiating mode, heating column has been installed at the bottom of shell, and the heat that circuit board heater members or parts are produced is dispelled the heat by casing.
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| CN 200910103390 CN101511043B (en) | 2009-03-16 | 2009-03-16 | Synthesis business networking method based on HFC broadband network, and synthesis business optical station equipment |
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| CN 200910103390 CN101511043B (en) | 2009-03-16 | 2009-03-16 | Synthesis business networking method based on HFC broadband network, and synthesis business optical station equipment |
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| CN102739514A (en) * | 2011-04-05 | 2012-10-17 | 美国博通公司 | Traffic switching in hybrid fiber coaxial (hfc) network |
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| CN100448213C (en) * | 2007-01-17 | 2008-12-31 | 陈勇 | HFC network wideband access system based on MoCA technology |
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| CN102739514A (en) * | 2011-04-05 | 2012-10-17 | 美国博通公司 | Traffic switching in hybrid fiber coaxial (hfc) network |
| CN102739514B (en) * | 2011-04-05 | 2015-05-06 | 美国博通公司 | Coaxial cable media converter and traffic switching method |
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| CN103634222B (en) * | 2012-08-27 | 2016-12-21 | 华为技术有限公司 | The device of Message processing, method and system |
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| CN103826110A (en) * | 2013-12-30 | 2014-05-28 | 苏州云普通讯技术有限公司 | Data broadcast system of broadband full-service bearer network |
| CN104980221B (en) * | 2014-04-10 | 2017-08-25 | 上海未来宽带技术股份有限公司 | The optical workstation equipment of hfc plant and the docking system of C DOCSIS field equipments and method |
| CN104980221A (en) * | 2014-04-10 | 2015-10-14 | 上海未来宽带技术股份有限公司 | Docking system and method of optical workstation equipment of HFC equipment and C-DOCSIS field equipment |
| CN105071862A (en) * | 2015-06-30 | 2015-11-18 | 山东广电网络有限公司滨州分公司 | Integrated access multifunctional all-in-one machine for optical node network |
| CN107925597A (en) * | 2015-07-15 | 2018-04-17 | 思科技术公司 | Scheduling mechanism in full duplex cable system environment |
| CN107925597B (en) * | 2015-07-15 | 2020-11-06 | 思科技术公司 | System and method for scheduling in a full duplex cable network environment |
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