CN201374788Y

CN201374788Y - Integrated service light station

Info

Publication number: CN201374788Y
Application number: CN200920126648U
Authority: CN
Inventors: 曾喜华; 陈戎; 秦宗华; 钱克军
Original assignee: CHONGQING JINGHONG HI-TECH Co Ltd
Current assignee: Chongqing Jinghong optic Technology Co. Ltd.
Priority date: 2009-03-16
Filing date: 2009-03-16
Publication date: 2009-12-30
Anticipated expiration: 2019-03-16

Abstract

The utility model discloses an integrated service light station. An integrated module is integrated with a CMTS function module, a radio-frequency signal photoelectric conversion function module and an IP data photoelectric conversion function module. An interface includes an input interface and a coaxial cable radio-frequency output interface, wherein the input interface consists of a television optical interface and an IP data optical interface. The television optical interface is connected with the radio-frequency signal photoelectric conversion function module used for converting television optical signals into electric signals, the IP data optical interface is connected with the IP data photoelectric conversion function module which is used for photoelectric conversion of an IP data packet and connected with a data port of the CMTS function module, and the CMTS function module is used for modulating, demodulating and retransmitting IP data signals. Cable television network broadband nets built by employing the integrated service light station are capable of reducing interference of 'funnel noise' and increasing household average band width when users surf the Internet. Moreover, the integrated service light station has the advantages of saving network building costs, realizing easy maintenance and the like.

Description

Integrated service light station

Technical field

The utility model relates to a kind of integrated service access device 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 optical station equipment 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 the standard based on DOCSIS (Data Over Cable Service Interface Specification), use CM (Cable Modem cable modem), CMTS equipment such as (Cable Modem Termination 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 distributes gauze three parts to form by headend room, fiber optic backbone and coaxial cable usually.Headend 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 respectively.CMTS receives the modulation signal of sending from user side CM (being called upward signal), demodulates IP packet wherein, and is forwarded among the Internet according to destination address; Simultaneously, the data-signal that CMTS also will come from Internet (is called downstream signal) and sends to the CM of user side after debugging, and it plays the gateway bridge 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.The problem that mainly has 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.

And the optical workstation that uses in the prior art does not possess the function of the IP data being carried out opto-electronic conversion and data forwarding only at TV signal yet.

The utility model content

Technical problem to be solved in the utility model is in order to overcome above-mentioned the deficiencies in the prior art, by CMTS function, radiofrequency signal photoelectric converting function, IP data-signal photoelectric converting function are become one, manufacture incorporate equipment---integrated service light station (ISON, Integrated Service Optical Node), this equipment is installed on the optical node of HFC broadband network, reduce noise jamming to reach, improve bandwidth, simplification network configuration and saving construction cost per family, and the purpose that is easy to safeguard.

For solving the problems of the technologies described above, the utility model adopts following technical scheme:

Integrated service light of the present utility model station 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.

As further optimization of the present utility model, the utility model adopts no fan design, is fit to open-air the installation, has waterproof ability.Being particularly suitable in the open air, the optical node place settles.

As the execution mode after the optimization of the present utility model, its inner integrated radiofrequency signal photoelectric conversion module and IP data-signal photoelectric conversion module is detachable design, so that the user whether need freely to select this module.Because if the whole set equipment of above-mentioned functions has been installed at the optical node place of user HFC, then can not select this module for use.At this moment, promptly original light input interface is changed into the electric signal input end mouth, specifically, its port is selected to be configured to: radio frequency input and radio frequency output interface (F type socket), RJ45 interface.

The utility model has common TV optical receiver function and IP data forwarding function simultaneously, is a comprehensive incorporate light-electric conversion equipment.Be to have adopted ripe TV light-receiving technology and DOCSIS technical standard therein, but remote monitoring, management, and installation and maintenance is very convenient.With regard to existing optical node device, have only optical receiver, optical workstation, optical transceiver and ONU several, and the utility model integrated service light station is a brand-new equipment.

Compared with prior art, the utlity model has following advantage:

1, adopts integrated service light of the present utility model station, reduced network funnel interference of noise.Because be installed on optical node, the number of users of covering is few, has just reduced passback funnel noise naturally, makes that the work of CMTS module is more stable; In addition, also be unlikely to influence other sections user's proper communication, make the whole system antijamming capability strengthen even a section is interfered.

2, adopt integrated service light of the present utility model station, improved bandwidth per family.Significantly reduce because have the number of users of the CMTS module covering of same bandwidth capacity with traditional C MTS equipment, so getable per family bandwidth resources are increased.

3, adopt integrated service light of the present utility model station, simplified HFC broadband network structure, reduced the networking cost.Because no longer need traditional optical workstation and passback optical receiver, on average each optical node can be saved 5000～8000 yuan.

4, adopt integrated service light of the present utility model station, make network operation simple more, convenient.

Description of drawings

Fig. 1 is the network topology structure figure of traditional HFC broadband access technology;

Fig. 2 is for adopting the utility model---the HFC broadband network topology diagram that integrated service light station makes up;

Fig. 3 is the utility model---the internal circuit theory diagram at integrated service light station;

Fig. 4 is the utility model---the inside theory diagram of CMTS module in the integrated service light station

Embodiment

As shown in Figure 3, the Integrated Services Transmission device based on the HFC broadband network 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.

Operation principle of the present utility model is:

Referring to Fig. 2, the effect of integrated service optical station equipment 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.

As shown in Figure 3, 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 CMT8 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.

Technology implementation of the present utility model, adopt following design:

1. make the CMTS modularization:

Traditional CMTS equipment is made up of polylith circuit boards (card) such as CPU control, modulation, up-conversions, and is bulky.The utility model at first will be realized modularization with CMTS, with reduced volume, reduces power consumption.Adopted the ETXCPU module at this.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 the integrated cpu subsystem of sound card, LVDS demonstration, network interface, USB and standard I/O function on the 95x114mm size, Protean interface section and the expansion of client's specific function then design on the support plate of any geomery, and the ETX module is connected with support plate by the high-density connector of 4 100pin.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 utility model 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, select the ETX stay in place form, can select CPU low in energy consumption, help reducing the power consumption of complete machine.

In addition, the function of upconverter is directly designed on same pcb board, and note strengthening shielding and isolate.

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, 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:

CMTS module, radiofrequency signal photoelectric conversion module, IP data photoelectric conversion module and monitoring module are become one.TV signal photoelectric conversion module wherein is the core component in the traditional TV optical receiver, IP data-signal photoelectric conversion module is the core component of Ethernet optical transceiver (or ONU), the two all is matured products, can be supporting by purchasing, be integrated in the cabinet with CMTS module and remote monitoring module 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:

On existing CMTS basis of software, increase remote monitoring function to equipment, again driving, communication, interface etc. are integrated.Make the network manager in the distance machine room can control the working condition of each optical node place integrated functional module.Its remote monitoring and administration module has adopted based on SNMP standard network management protocol, after three modules can being become one it is managed on same network management platform.

Claims

1, a kind of integrated service light station 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.

2, integrated service light as claimed in claim 1 station is characterized in that, described casing adopts the aluminum alloy heat sink section bar to make the airtight waterproof casing, and heating column is installed in the position of corresponding circuits plate at the bottom of shell; The CMTS circuit board of described circuit board for constituting after designing by CPU control unit, modem module and up-conversion unit integral.

3, integrated service light as claimed in claim 1 station is characterized in that, inner integrated TV optical signal receiving module and IP data-signal transceiver module is detachable.