CN1725848A - Frequency hopping method of cable modem, cable modem and transmission system - Google Patents

Frequency hopping method of cable modem, cable modem and transmission system Download PDF

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Publication number
CN1725848A
CN1725848A CN 200510069136 CN200510069136A CN1725848A CN 1725848 A CN1725848 A CN 1725848A CN 200510069136 CN200510069136 CN 200510069136 CN 200510069136 A CN200510069136 A CN 200510069136A CN 1725848 A CN1725848 A CN 1725848A
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China
Prior art keywords
frequency
cable modem
frequency hopping
module
control command
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CN 200510069136
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CN100474918C (en
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武爱平
张高峰
刘建华
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Zhongdiantong (beijing) Digital Tv Development Co Ltd
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Zhongdiantong (beijing) Digital Tv Development Co Ltd
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Priority to CNB2005100691369A priority patent/CN100474918C/en
Publication of CN1725848A publication Critical patent/CN1725848A/en
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Abstract

A frequency hopping method of cable modem includes sending frequency hopping control command having an assigned frequency point to frequency hopping module of cable modem by user terminal, scanning all down link frequency point by Tunner control module in cable module, receiving frequency hopping control command by said frequency hopping module. Switching said Tunner control module on said frequency point according to control command and making cable modem finalize registration to CMTS operated on said frequency point.

Description

The frequency-hopping method of cable modem, cable modem and transmission system
Technical field
The present invention relates in the two-way hfc plant of cable TV the network access technique of broadband IP data, services, particularly a kind of cable modem frequency-hopping method, device and transmission system that can change descending frequency.
Background technology
Along with the develop rapidly of Internet, to being that the data traffic requirement of representative has been created huge business opportunity with the IP technology.Cable data access technology is a network access technique of realizing the broadband IP data, services by two-way HFC transmission network.By Cable Modem the IP broadband data services is delivered to family and medium-sized and small enterprises, become the value-added service of CHINA RFTCOM Co Ltd development.
Cable Modem (cable modem, CM) all be data to be modulated in the frequency range of back at cable to transmit on the principle with common Modem, carry out demodulation during reception, transporting mechanism is identical with common Modem, and difference is that it is to carry out modulation by certain transmission band of cable TV HFC net.Cable Modem belongs to shared medium system, and other idle frequency ranges still can be used for the transmission of cable TV signal.Cable Modem has thoroughly solved the obstruction that the transmission owing to audiovideo causes, its speed has reached more than the 10Mbps, and downstream rate is then higher.Cable Modem also is a key equipment of setting up metropolitan area network, and hybrid fiber coax (HFC) backbone optical fiber connects the user with tree type bus coaxial cable net in the light node sub-district, and its transmission frequency can be up to 550/750MHz.The transmission data just need to use Cable Modem in the HFC net.
It generally is that the channel of isolating a 8MHz or 6MHz from 42MHz~750MHz television channel is used for descending transmission data that the technology of Cable Modem realizes.Usually downlink data adopts 64QAM (quadrature amplitude modulation) modulation system, and flank speed can reach 38Mbps or 27Mbps, if adopt 256QAM, flank speed can reach 51Mbps or 36Mbps.Upstream data generally transmits by one section frequency spectrum between 5MHz~42MHz, in order effectively to suppress up noise accumulation, generally selects the QPSK modulation for use, and QPSK is more suitable for noisy environment than 64QAM, but speed is lower.CMTS is encapsulated in the MPEG-TS frame from the Frame that extraneous network receives, and outputs to user side by descending digital modulation and RF (Radio Frequency), receives up data transaction of coming out simultaneously and becomes ethernet frame.The basic function of user side Cable Modem is modulated into digital uplink signal the RF signal exactly, and descending RF signal is demodulated into digital signal, solves data from the MPEG-TS frame, forms the data of Ethernet, by the port output of 10-BaseT or USB.At the HFC net is frequency division multiplexing, but the channel on a certain frequency then shared by a lot of users, controls the problem of user channel allocations and competition by MAC, also supports the business of different brackets simultaneously.Can be configured Cable Modem in the hfc plant by network management system, and carry out state, traffic monitoring and diagnosis.
In Cable Modem system, adopted two-way asymmetric techniques, there is the analog bandwidth of 8MHz or 6MHz to share at down direction for the user in the system.Present Cable Modem working method is only to be operated on the single descending frequency, promptly behind the descending frequency that searches for the first time front end CMTS setting, just forever be operated on this frequency, cannot change by the user, unless front end CMTS cancels this descending frequency, reset new descending frequency.If in the peak period that network uses, just have congestedly, along with the development of video compression technology and the service needed of VoIP, can bring more large-capacity data transmission requirement, at this moment only depend on a descending frequency, can not satisfy professional development far away.
Summary of the invention
The object of the present invention is to provide a kind of frequency-hopping method, cable modem and transmission system of cable modem, on the basis of existing cable modem, introduce frequency hopping, the user can change descending frequency at any time, increases user's utilized bandwidth.
To achieve these goals, the invention provides a kind of method of cable modem frequency hopping, wherein, may further comprise the steps:
Step 1, user terminal send the frequency hopping module of frequency hopping control command to described cable modem, and described frequency hopping control command comprises that one specifies frequency;
Step 2, described frequency hopping module is set at described appointment frequency according to described frequency hopping control command with the working frequency points of described cable modem.
The method of above-mentioned cable modem frequency hopping, wherein, described step 2 specifically may further comprise the steps:
Step 21, the Tuner control module in the described cable modem scans all descending frequencies;
Step 22, described frequency hopping module receive the frequency hopping control command that described user terminal sends;
Step 23, the Tuner control module in the described cable modem switches to described switching frequency according to described control command;
Step 24, described cable modem is finished registration to the CMTS that is operated in described switching frequency.[0]
The method of above-mentioned cable modem frequency hopping, wherein, described step 23 specifically may further comprise the steps:
Step 231, the Tuner control module locks a frequency;
Step 232 judges whether described blocked frequency is described appointment frequency, if then enter described step 24, if not entering next step;
Step 233 is judged the running time of overlength whether, if overlength, if reporting errors and finishing then is overlength then enter next step not;
Step 234, described Tuner control module locking another one frequency, and return step 232.
The method of above-mentioned cable modem frequency hopping, wherein, described step 24 specifically:
Described cable modem is connected, sets up the time on date by obtaining line parameter, range finding and adjusting, set up IP automatically, send optional parameters and registration goes up line process and finishes registration to the CMTS that is operated in described switching frequency.
The method of above-mentioned cable modem frequency hopping, wherein, in the described step 24, described cable modem is being found range and is being adjusted automatically and set up and also carry out device class identification between the IP connection.
The method of above-mentioned cable modem frequency hopping, wherein, described user terminal utilizes telnet command mode, built-in Webserver mode or internal command transfer mode to send the frequency hopping control command to described frequency hopping module.
The method of above-mentioned cable modem frequency hopping, wherein, described cable modem comprises the autonomous device that meets DOCSIS or EURODOCSIS standard.
The method of above-mentioned cable modem frequency hopping, wherein, described cable modem comprises the functional circuit that meets DOCSIS or EURODOCSIS standard that designs in circuit.
In order better to realize above-mentioned purpose, the present invention also provides a kind of cable modem, wherein, comprise a frequency hopping module, be used to receive user terminal and send the frequency hopping control command, and, the working frequency points of described cable modem is set at described appointment frequency according to the appointment frequency in the described frequency hopping control command.
Above-mentioned cable modem wherein, comprises the autonomous device that meets DOCSIS or EURODOCSIS standard.
Above-mentioned cable modem wherein, comprises the functional circuit that meets DOCSIS or EURODOCSIS standard that designs in circuit.
In order better to realize above-mentioned purpose, the present invention also provides a kind of transmission system, comprise HFC and the CMTS and the cable modem that connect by HFC, wherein, described cable modem comprises a frequency hopping module, be used to receive user terminal and send the frequency hopping control command, and according to the appointment frequency in the described frequency hopping control command, the working frequency points of described cable modem is set at described appointment frequency.
Method of the present invention, Apparatus and system do not need CMTS and bilateral network are done any change, only need be at terminal equipment---adopt " frequency hopping " technology among the Cable Modem, adopt this method, just can in existing network, increase user's utilized bandwidth exponentially.In conjunction with technology such as up-to-date video encoding and VoIP, can in the HFC bilateral network, realize the broadcast of broadband access network, IP phone and hundreds of way word TVs.
Adopt present technique with Cable Modem and IP set-top box, the integrated design of IP phone in sole user's end equipment, to accomplish real unification of three nets.Can be an equipment only also, be used for Digital Television reception, mutual and broadband access network Cable Modem and set-top box design.
The present invention is described in detail below in conjunction with drawings and Examples.
Description of drawings
Fig. 1 is the system global structure figure of CM;
Fig. 2 is the workflow of the CM of employing frequency hopping of the present invention;
Fig. 3 realizes the frequency hopping schematic diagram for built-in Webserver mode;
Fig. 4 carries out the professional schematic diagram of frequency hopping for operator utilizes the Web page mode;
Fig. 5 is for using the transmitting device and the system construction drawing of " frequency hopping " technology;
Fig. 6 is the outside connection layout of single cm device;
Fig. 7 is a Cable Modem internal module structure chart;
Fig. 8 is inner integrated digital television module of Cable Modem and voip module schematic diagram;
Fig. 9 is built-in Webserver mode workflow structural representation;
Figure 10 is the logical flow chart of function to Figure 12;
Figure 13 is built-in Webserver mode logic flow schematic diagram.
Embodiment
As shown in Figure 1, in the present invention, define a frequency hopping module 1 at the application software layer of CM, by this frequency hopping module 1, the mode by Telnet, built-in Webserver or internal command transmit can make CableModem be operated on the needed frequency.
Realize that frequency hopping function mainly needs two functional modules: frequency hopping module and Tuner control module.The frequency hopping module belongs to the application software layer of CM; The Tuner control module belongs to CM and drives and resource layer, is original design module, is responsible for the scanning and the control of downlink channel.After CM powered up, embedded operating system brought into operation (as the pSOS real time operating system), and after the self check of carrying out hardware, the Tuner control module begins the searching downlink frequency; The frequency hopping module is according to the appointment frequency order that receives (utilizing Telnet, built-in Webserver or order transfer mode), send the frequency of appointment to the Tuner control module, the Tuner control module forwards this to and specifies frequency, carry out descending locking frequency point, if lock successfully, then finish frequency hopping, carry out next step operation (obtaining line parameter); If fail to lock the descending frequency of appointment, then lock again.The hardware of frequency hopping module effect has QAM modulator-demodulator, Cable ModemPHY﹠amp; The MAC layer.The mode of user by setting sends the frequency hopping control command to CmlnfoArea, acts on CmApp, calls intrinsic function, finishes frequency hopping.
The description of the overall system structure of Cable Modem and frequency hopping module position, as shown in Figure 1, total system consists of the following components:
Drive and resource layer: the physics realization of DOCSIS and interface equipment driving etc. are provided; Wherein device drives comprises the equipment of being correlated with as FLASH, Ethernet interface, USB interface, DOCSIS MAC, safety encipher, tuner, also comprise a Cable Modem hardware abstraction administration module simultaneously: its major function is the various message encapsulation of definition, as data message, MAC administrative messag, Ethernet message; In addition, the bottom function (Tuner control module) of also responsible downlink channel scanning and Cable Modem condition managing, Watchdog realization etc.
The real time operating system layer: be a kind of embedded real-time multi-task operating system (as pSOS, vxworks etc.), its main function is:
BSP generates and instrument;
Multithreading (task) is realized: the establishment of thread (task) and scheduling (condition managing, priority management), inter-thread communication (as incident, signal, message queue etc.), synchronous;
Storage administration comprises memory allocation and visit protection;
The system time management is as timeslice, timer, date and time;
Interrupt and abnormality processing interrupt vector table, Interrupt Service Routine, exception catching and processing;
System's input/output function: mainly contain the interface between application program and the OS, the interface between OS kernel and the device driver; And
Network support.
Application software layer: on the operating system aspect, realize the software of answering of various functions, comprise application protocol, user interface, frequency hopping software etc.
Application protocol mainly comprises: SNMP, TFTP, DHCP, Telnet.
Application software mainly comprises: the interactive module between Cable Modem and the CMTS, DOCSIS MAC agreement and operational module, data forwarding module between RFI and the Ethernet/USB interface, CPE (Customer PremisesEquipment) administration module, the many IP of classification of service realize module, the on-line software updating functional module, control desk order management module, the SNMP processing module, the Webserver processing module, system's FWSM, data and parameter management module and frequency hopping module.
The present invention is the function expansion to the software configuration of Cable Modem, in existing software architecture, increases the frequency hopping module, so only describes the technology realization of frequency hopping module in this specification in detail, does not elaborate and other software modules are not done.
Frequency hopping is meant: in Hybrid Fiber and Coax Network HFC, different CMTS provides a plurality of different descending frequencies, and at each descending frequency simultaneously for validated user provides registration service, the user selects or arbitrarily changes the descending frequency of CableModem work voluntarily.By frequency hopping, can make Cable Modem initiatively select different descending frequencies, enlarged the bandwidth of operation of Cable Modem.
Adopt " frequency hopping " technology and traditional CM registration step to distinguish to some extent:
The CMTS that is operated in different frequent points will transmit up channel scanning symbol (UCD) for simultaneously Cable Modem, like this, when Cable Modem scans the descending frequency of each CMTS, can register.
Cable Modem increases " the jumping to " by user's control and specifies the frequency point scanning function, finishes registration again.
Like this, adopt the Cable Modem registration step of " frequency hopping " technology to be:
By subscriber terminal equipments such as computer or IP set-top box Cable Modem is sent the frequency hopping control command, at this moment CableModem is only specifying frequency to scan, wait for a up channel scanning symbol (UCD) that sends out from CMTS (Cable Modem Terminationsystem), obtain the transmission parameter of up channel.CMTS can periodically transmit UCD and give all Cable Modem.Cable Modem is through calibrating, set up IP connection, settling time, set up security mechanism, transmit operating parameter, the basic privacy mechanism of initialization, registering to CMTS.
Therefore, the workflow of the CM of employing frequency hopping of the present invention may further comprise the steps as shown in Figure 2:
Step S1, Cable Modem powers on, and behind system bottom Boot, begins the searching downlink frequency automatically by TunerWrite functions control Tuner control module;
Step S2, in the frequency hopping module, by forms such as built-in Webserver, Telnet or internal command transmission, receive the frequency hopping control command GoToDs_Fre () that user terminal sends, be the appointment value of frequency point in this instruction, SeCmDs_Fre () passes to TunerWrite with this value, writes in the tuner, begins scanning;
Step S3, tuner be with the signal in the scan value radio frequency interface of appointment, and lock a frequency;
Step S4, CM check whether the frequency after the locking is consistent with the frequency of appointment, if consistent, carry out step S7, if inconsistent, carry out step S5;
Whether step S5, judgement time overlength, if overlength, reporting errors, and abnormal ending if there is not overlength, then enter step S6;
Step S6, the Tuner control module locks a new frequency again, and returns step S4;
Step S7 obtains line parameter, range finding successively and adjusts automatically, device class identification, sets up IP and is connected, sets up line process in time on date, transmission optional parameters, the registration.
Realizing that with regard to CM several modes of " frequency hopping " are described in detail below, describe for convenient at this, is 192.168.100.1 with the IP address setting of CM.
First kind of mode is that command line mode is realized " frequency hopping ", and it can be in Telnet, and the mode by manual input command realizes, as:
C: Telnet 192.168.100.1 carriage return
>GotoFrq 508000 carriage returns
Wherein: GotoFrq is the frequency hopping order, and 508000 for specifying frequency.
The second way is built-in Webserver mode, promptly on the built-in Webserver of Cable Modem, realize frequency hopping, Cable Modem self has a built-in Webserver, this WebServer is as a kind of mode that realizes frequency hopping, its IP address is 192.168.100.1, can on this internal web, provide the function of specifying descending frequency, as shown in Figure 3.Its workflow schematic diagram is seen shown in Figure 9.
The third mode is the internal command transfer mode, promptly realize " frequency hopping " with the internal command transfer mode: subscriber terminal equipments such as computer, IP set-top box, IP phone send " frequency hopping " instruction to Cable Modem, Cable Modem accepts this order, and working frequency points is forwarded under the described frequency of instruction.This mode is the most convenient, effective in actual applications.
" frequency hopping " instruction in above-mentioned 3 kinds of modes is the order that is sent to Cable Modem by subscriber terminal equipments such as computer, IP set-top box, IP phone, Cable Modem must accept this order, and set up registration with CMTS again according to the frequency that command parameter is determined, be operated in then under the frequency of this appointment, arrive up to the similar instruction of the next one.
Concrete instruction definition is as shown in the table:
Project Example Data length (byte)
Command name GoToDs_Fre 32
Specified channel (KHz) 508000 8
A kind of feasible move instruction mode is by http protocol, to send instruction to the built-in Webserver of Cable Modem.For example, the order in the last table can be expressed as:
http://192.168.100.1/GoToDs-Fre?frq=’508000’
When operator utilizes " frequency hopping " technology to commence business application, can in the Web page, provide related frequency and business tine by configuration file being set at front-end server or utilizing the html page-describing.Business among the present invention is including but not limited to IPTV, IP phone, broadband access network.
The application of " configuration file mode " and " Web page mode " is described respectively below.
Configuration file mode: after terminal equipments such as computer, IP set-top box, IP phone are set up network and are connected by Cable Modem and front-end server, a file be can obtain from the server of assigned ip automatically, each business and place frequency described in this document.Terminal equipments such as computer, IP set-top box, IP phone can utilize this file, send " frequency hopping " instruction to Cable Modem, then, carry out relevant business again.The form of configuration file table is as follows:
Project Data length (byte)
Service indicates 8
Information on services 32
Place channel (KHz) 8
Select fill order 32
To watch that on the IP set-top box video frequency program is an example, illustrates the mode of configuration file.
When the IP set-top box is registered for the first time, can receive the program configuration file of downloading on the carrier server, following table illustrates:
Sequence number Service indicates Information on services Place channel (KHz) Select fill order
1 Video The Chinese Central Television's one cover 508000 iptv://224.2.171.1:1111/udp
2 Audio Beijing Traffic Announcement 516000 iptv://224.2.171.2:1111/udp
3 Video BTV's one cover 746000 iptv://224.2.171.3:1111/udp
…………… …………… …………… ……………
When user's manipulator top box is seen program, software in the set-top box, utilize this configuration file that has downloaded to set-top box, take out relevant information, send " frequency hopping " instruction to Cable Modem, for example, when selecting to watch the 1st programs, set-top box can send " frequency hopping " instruction to 508000KHz to Cable Modem, after to be registered the finishing, change the programme information that removes to search Business Stream " Chinese Central Television's one cover ", and play.
Web page mode: terminal equipments such as computer, IP set-top box, IP phone, sign in to the Web page of commencing business, in the description of the page, provide the incidence relation of this business and frequency, when the user selects this professional, terminal equipments such as computer, IP set-top box, IP phone are according to the frequency of association, send " frequency hopping " instruction to Cable Modem, then, turn to this business again.
With the video frequency program is example, does an explanation, supposes programm name: " middle electricity leads to the consultancy platform ".
As shown in Figure 4, in the Web page, the multicast data flow of corresponding " middle electricity leads to the consultancy platform " television channel " clicks and play " to button, and the frequency at this multicast data flow place, and it can be one of following form that its btml describes:
<p><a?href=″iptv://224.2.171.2:1111/udp″frq=″508000″>
<img?border=″0″src=″iptvimages/play.gif″width=″133″height=″22″>
</a><p>
Wherein: the logical consultancy platform of electricity in href=" iptv: // 224.2.171.2:1111/udp " expression " the IP address and the port numbers of TV programme multicast data flow, business information frq=" 508000 " such as udp multicast represent that this business place frequency is 508000KHz; The button that src=" iptvimages/play.gif " expression " is clicked and play ".
After the user presses the button " click and play ", terminal equipments such as computer, IP set-top box, IP phone send " frequency hopping " instruction to 508000KHz can for Cable Modem, after to be registered the finishing, change and remove to search the Business Stream programme information of " middle electricity leads to the consultancy platform ", and play.
Fig. 9 is the frequency hopping process schematic diagram of Web page mode.
As shown in Figure 9, CPE is by on the Web page that signs in to Cable Modem, send frequency hopping request Request, the Webserver processing module of Cable Modem is called the frequency hopping module of application layer, transmit and set descending frequency SetDSFreq order, the result that frequency hopping is handled turns back to the Web page by GetCmInfo, then, feeds back to CPE by Response.Its flow chart as shown in figure 13.
The main function definition that wherein can be applied to is as follows:
Function name Function representation Affiliated module
Get_DsFre Specify descending frequency at WEB The frequency hopping module
Send_Ack WEB returns the result who specifies descending frequency The frequency hopping module
GoToDs_Fre Jump to the appointment frequency The frequency hopping module
SetCmDs_Fre Set descending frequency The frequency hopping module
TunerWrite This function mainly is the scanning frequency of control tuner The Tuner control module
WriteDownstream This function is responsible for writing the register of descending module The Tuner control module
ReadDownstream This function is responsible for reading the register of downstream module The Tuner control module
FindDownstream The gated sweep downstream frequency The Tuner control module
The specification of the function in the last table is as follows:
Get_DsFre (): specify descending frequency at WEB
Title: lFreq;
Data type: int32;
The effective range of data value: 50.0MHz-801.25MHz
Send_Ack (): WEB returns the result who specifies descending frequency
Numerical value: 0or1;
Data type: Bool;
GoToDs_Fre (): the frequency that jumps to appointment
Title: lFreq;
Data type: int32;
The effective range of data value: 50.0MHz-801.25MHz
SetCmDs_Fre (): the descending frequency that the frequency of appointment is set at current scanline
Title: lFreq;
Data type: int32;
The effective range of data value: 50.0MHz-801.25MHz
TunerWrite (): carry out the action that Hz is converted to MHz, the most-significant byte with the result writes Divider byte1 (being used for the memory scanning frequency values) register simultaneously, and least-significant byte writes in Divider byte 2 registers, and this function input item name is called lFreq; Data type is int32, the effective range of data value be 50.0MHz to 801.25MHz, the source of input data is the frequency of scanning during down channel.
WriteDownstream (): it is input as ULONG Register, UCHAR ValueIn[], UCHARLength, and ValueIn[] in value convert Value to according to Length size (byte, double byte and nybble), write among the Register then, its be output as 0 or>0, wherein, Register represents the address of first register of depositing in, less than 0 * 1000 is the multibyte register, otherwise be the byte register, ValueIn[] expression will write the array of data, Length: expression writes the length (is unit with the byte) of data; The data type of output item is the ULONG type, data area 0 expression write operation success, and>0 expression write operation failure, its function logic flow is as shown in figure 10.
ReadDownstream (): it is input as ULONG Register, UCHAR*ValueOut and UCHARLength, it converts the value among the Register to Value according to Length size (byte, double byte and nybble), output among the ValueOut then, its be output as 0 or>0, wherein, Register represents the address of first register of exporting, less than 0 * 1000 being the multibyte register, otherwise be the byte register; ValueOut represents to write the array of data; Length: the length (is unit with the byte) of expression dateout, its dateout type is the ULONG type, data area: 0 expression read operation success,>0 expression read operation failure, its function logic flow is as shown in figure 11.
FindDownstrearn (): it is input as int * StartingPoint, BOOL singleScan and ULONG*pRealFrequency, and begin to retrieve frequency from StartingPoint and scan, then the result is exported, its be output as 0 or>0, wherein StartingPoint is a pointer, point to the original frequency position of line scanning down, whether the SingleScan sign carries out unifrequency scanning, and (TURE is a unifrequency, FALSE is a multi-frequency), PRealFrequency represents the actual frequency that scans.Its dateout type is the ULONG type, data area: 0 expression read operation success, and>0 expression read operation failure, its function logic flow is as shown in figure 12.
Fig. 5 has shown the transmitting device and the system construction drawing of use " frequency hopping " technology.
The each several part function is as follows:
Server 10 server ends: CMTS 20 is managed configuration, comprise data feedback channel, down going channel, running parameter of every CMTS20 etc.; Simultaneously Cable Modem 30 (hop set) is managed setting, comprise the opening an account of CableModem30, cancellation, account number authentication, traffic management etc.;
CMTS 20: be used to connect two-way HFC net and broadband data network, for the Cable Modem of user side provides control, management and data-transformation facility, it provides in daynamic bandwidth managment, the high speed information flow set, the access control of data network resources and guarantee data service quality.Each CMTS integrated circuit board generally is configured to a downlink channel, and 2 or 4 upstream channels can be supported 1000-2000 user.In this system, a plurality of CMTS provide a plurality of downlink channels, form a multi-service service network;
Blender 40: it is one road signal that multi-channel rf signal (transmission of Cable line) is mixed, and transmits through optical sender;
More than three parts be that headend room constitutes;
Hfc plant 50: hop;
The Cable Modem of " frequency hopping " technology of employing and the external equipment 30 of connection thereof: ustomer premises access equipment has multiple connected mode and combination.
Fig. 6 has shown the situation of the external equipment of single Cable Modem equipment and connection thereof.Cable Modem externally is connected with computer, IP set-top box, IP phone, and certainly, only connection is wherein a kind of in actual the use, also can connect wherein any two kinds, can also connect three kinds of external equipments simultaneously.
Fig. 7 is the internal module structure of CableModem.
As shown in Figure 7,, receive the radio frequency interface of CableModem, after handling through tuner (Tuner), send into core processor (the Docsis MAC﹠amp of CableModem from the signal that cable television transmits; PHY, RISC) demodulation, be converted into the IP bag, after Ethernet interface or USB interface, pass to external device.If front end Server to CableModem with the external equipment number unrestricted, can use Ethernet interface and USB mouth simultaneously, when two above equipment are arranged, but behind Ethernet interface adjunction one hub (Hub).The user utilizes frequency hopping according to the hobby of oneself, can switch to needed service easily.
Certainly, also can be at inner integrated digital television module of Cable Modem and/or voip module, unification of three nets terminal equipment as shown in Figure 8.
The unification of three nets terminal equipment, contain the CM module simultaneously, look audio processing modules, speech processing module, outsidely is connected with computer, television set, IP phone, can connect wherein a kind of in the reality use, also can connect wherein any two kinds, can also connect three kinds of external equipments simultaneously.In the unification of three nets terminal equipment, CableModem module (data), IPTV module (video), VCIP module (voice) are integrated into single equipment, can be connected to computer by Ethernet interface or USB interface, surf the web, activity such as network gaming; By S-video or YUV interface, be connected to common simulated television, can watch video frequency program; Can connect one one or the common analog station of multi-section by one or more telephony interface (RJ11), converse.
In the implementation method of the present invention to its direct acting equipment, include but not limited to cable modem, it also comprises the autonomous device that meets DOCSIS or EURODOCSIS standard, or designs the functional circuit that meets DOCSIS or EURODOCSIS standard in circuit.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.

Claims (12)

1, a kind of method of cable modem frequency hopping is characterized in that, may further comprise the steps:
Step 1, user terminal send the frequency hopping module of frequency hopping control command to described cable modem, and described frequency hopping control command comprises that one specifies frequency;
Step 2, described frequency hopping module is set at described appointment frequency according to described frequency hopping control command with the working frequency points of described cable modem.
2, the method for cable modem frequency hopping according to claim 1 is characterized in that, described step 2 specifically may further comprise the steps:
Step 21, the Tuner control module in the described cable modem scans all descending frequencies;
Step 22, described frequency hopping module receive the frequency hopping control command that described user terminal sends;
Step 23, the Tuner control module in the described cable modem switches to described switching frequency according to described control command;
Step 24, described cable modem is finished registration to the CMTS that is operated in described switching frequency.
3, the method for cable modem frequency hopping according to claim 2 is characterized in that, described step 23 specifically may further comprise the steps:
Step 231, the Tuner control module locks a frequency;
Step 232 judges whether described blocked frequency is described appointment frequency, if then enter described step 24, if not entering next step;
Step 233 is judged the running time of overlength whether, if overlength, if reporting errors and finishing then is overlength then enter next step not;
Step 234, described Tuner control module locking another one frequency, and return step 232.
4, according to the method for claim 2 or 3 described cable modem frequency hoppings, it is characterized in that, described step 24 specifically:
Described cable modem is connected, sets up the time on date by obtaining line parameter, range finding and adjusting, set up IP automatically, send optional parameters and registration goes up line process and finishes registration to the CMTS that is operated in described switching frequency.
5, the method for cable modem frequency hopping according to claim 4 is characterized in that, in the described step 24, described cable modem is being found range and adjusted automatically and set up and also carry out device class identification between the IP connection.
6, according to the method for claim 2 or 5 described cable modem frequency hoppings, it is characterized in that described user terminal utilizes telnet command mode, built-in Webserver mode or internal command transfer mode to send the frequency hopping control command to described frequency hopping module.
According to the method for claim 1,2 or 3 described cable modem frequency hoppings, it is characterized in that 7, described cable modem comprises the autonomous device that meets DOCSIS or EURODOCSIS standard.
8, the method for cable modem frequency hopping according to claim 7 is characterized in that, described cable modem comprises the functional circuit that meets DOCSIS or EURODOCSIS standard that designs in circuit.
9, a kind of cable modem, it is characterized in that, comprise a frequency hopping module, be used to receive user terminal and send the frequency hopping control command, and, the working frequency points of described cable modem is set at described appointment frequency according to the appointment frequency in the described frequency hopping control command.
10, cable modem according to claim 9 is characterized in that, comprises the autonomous device that meets DOCSIS or EURODOCSIS standard.
11, cable modem according to claim 10 is characterized in that, comprises the functional circuit that meets DOCSIS or EURODOCSIS standard that designs in circuit.
12, a kind of transmission system, comprise HFC and the CMTS and the cable modem that connect by HFC, it is characterized in that, described cable modem comprises a frequency hopping module, be used to receive user terminal and send the frequency hopping control command, and, the working frequency points of described cable modem is set at described appointment frequency according to the appointment frequency in the described frequency hopping control command.
CNB2005100691369A 2005-03-25 2005-05-11 Frequency hopping method of cable modem, cable modem and transmission system Expired - Fee Related CN100474918C (en)

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CN102195913A (en) * 2010-03-04 2011-09-21 国基电子(上海)有限公司 Broadband cable modem and frequency sweeping method thereof
CN102291348A (en) * 2010-06-21 2011-12-21 国基电子(上海)有限公司 Cable modem and frequency locking method thereof
WO2013166805A1 (en) * 2012-05-09 2013-11-14 深圳Tcl新技术有限公司 Method and device for selecting television network application
CN107888413A (en) * 2017-11-03 2018-04-06 鼎点视讯科技有限公司 CMTS system upper level link guard methods and device
CN111953917A (en) * 2020-08-21 2020-11-17 四川九州电子科技股份有限公司 Channel locking and binding method based on DOCSIS3.1 system

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Publication number Priority date Publication date Assignee Title
CN102195913A (en) * 2010-03-04 2011-09-21 国基电子(上海)有限公司 Broadband cable modem and frequency sweeping method thereof
CN102291348A (en) * 2010-06-21 2011-12-21 国基电子(上海)有限公司 Cable modem and frequency locking method thereof
CN102291348B (en) * 2010-06-21 2014-03-12 国基电子(上海)有限公司 Cable modem and frequency locking method thereof
WO2013166805A1 (en) * 2012-05-09 2013-11-14 深圳Tcl新技术有限公司 Method and device for selecting television network application
CN107888413A (en) * 2017-11-03 2018-04-06 鼎点视讯科技有限公司 CMTS system upper level link guard methods and device
CN111953917A (en) * 2020-08-21 2020-11-17 四川九州电子科技股份有限公司 Channel locking and binding method based on DOCSIS3.1 system
CN111953917B (en) * 2020-08-21 2022-02-18 四川九州电子科技股份有限公司 Channel locking and binding method based on DOCSIS3.1 system

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