CN103997354B - A kind of mixing system, mixer device and frequency mixing method - Google Patents

The invention discloses a kind of mixing system, described system includes: coaxial cable transmission Ethernet data (DOCSIS EOC) data module and mixer device under first line of a couplet module, Data Over Cable Service interface specification.The present invention further simultaneously discloses a kind of mixer device and frequency mixing method, use the present invention, the problem that after solving to be mixed because of multichannel wired TV (CATV) radiofrequency signal and DOCSIS radiofrequency signal, the performance such as the load capacity of headend, transmission range declines therewith, improve load capacity and the transmission range of headend, disclosure satisfy that the signal receiving strength standard of the terminal units such as the cable modem (CM) of user terminal network side, Set Top Box (STB) and cable television simultaneously.

Frequency mixing system, frequency mixing device and frequency mixing method

Technical Field

The present invention relates to the field of communications, and in particular, to a frequency mixing system, a frequency mixing apparatus, and a frequency mixing method.

Background

In order to meet the requirement of simultaneously providing multiple services such as video, voice, broadband and the like on the same copper Cable entering a home, various technologies of transmitting Ethernet Data (EOC, Ethernet Over Cable) through coaxial cables appear in succession, wherein the technology of Passive Optical Network (PON), Data Over Cable Service Interface Specification (DOCSIS), EOC is one of the main access schemes recommended by the central office of radio and television, and is widely concerned and applied. However, to realize simultaneous transmission of DOCSIS service and cable TeleVision (CATV) service over the copper cable to the home, it is necessary to mix and output the DOCSIS rf signal and the CATV rf signal. At present, most of optical receiver nodes of the CATV network of the domestic radio and television are moved down to a cell or a corridor, and most of radio frequency output ports of the optical receiver are multi-port output, such as four-port, three-port or two-port, so that the realization of the mixing output of multi-path CATV radio frequency signals and DOCSIS radio frequency signals is a necessary means for realizing the carrying of the home-entry copper cable multi-service.

In practical applications, the DOCSIS technology is a data access technology that uses a Frequency Division Duplex (FDD) working mode, and realizes bidirectional data transmission by using a working mode in which uplink data and downlink data respectively work in different Frequency bands, and is widely applied to Hybrid Fiber Coaxial (HFC) networks. The uplink data transmission of the DOCSIS technology mainly works in a frequency band of 5-42MHz or 5-65MHz, and the downlink data transmission mainly works in a frequency band of 87-1004 MHz. The radio frequency band of CATV radio frequency signal is located in DOCSIS down frequency band interval, the working frequency band is 87-870MHz, and the data format is consistent with the data format of DOCSIS down frequency band, and is the audio and video compression coding (MPEG) 2 format or MPEG-4 format.

According to CATV technical standards and DOCSIS technical standards in the field of broadcasting and television, Cable modems (CMs, Cable modems), Set-Top boxes (STBs, Set Top boxes) and Cable television receiving terminals on the network side of a user terminal have strict minimum and maximum receiving and transmitting level limit standards for received DOCSIS radio frequency signals and CATV radio frequency signals, so as to ensure stability, reliability and standardization of network signals. Meanwhile, the radio and television operators require head-end equipment carrying CATV radio frequency signals or DOCSIS radio frequency signals to have different load capacities ranging from 50 to 500 households, and the transmission distance between each stage of amplifier can reach more than 300 meters so as to meet the requirements of different operators on user access and network coverage.

However, when multiple CATV rf signals from the optical receiver are mixed with the DOCSIS rf signals, there are influences such as signal distribution, insertion loss, and crosstalk, and when these problems are solved by the amplifier, there may be risks such as saturation distortion and high-band rf index degradation, so that the mixed output DOCSIS rf signals and CATV rf signals cannot meet the application requirements of radio and television operators and the requirements of national relevant technical standards.

Disclosure of Invention

In view of the above, the main objective of the present invention is to provide a mixing system, a mixing apparatus and a mixing method, which solve the problem that the performance of the head-end equipment, such as the load capacity and the transmission distance, is reduced after the multiple CATV rf signals and the DOCSIS rf signals are mixed.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

the invention provides a frequency mixing system, which comprises an uplink module, a DOCSIS EOC data module and a frequency mixing device, wherein the uplink module comprises a first data transmission module and a second data transmission module; wherein,

the uplink module is configured to receive a downlink ethernet data signal, perform service mapping and service switching processing on the downlink ethernet data signal, and send the processed downlink ethernet data signal to the DOCSIS EOC data module;

the DOCSIS EOC data module is configured to receive a downlink ethernet data signal sent by the uplink module, convert the downlink ethernet data signal into a downlink DOCSIS radio frequency signal corresponding to the downlink ethernet data signal according to an ethernet data interface protocol, and send the downlink DOCSIS radio frequency signal to the frequency mixing device;

the frequency mixing device is used for receiving a downlink DOCSIS radio frequency signal sent by the DOCSIS EOC data module; the high-pass filtering device is also used for receiving CATV radio frequency signals, mixing the downlink DOCSIS radio frequency signals with the CATV radio frequency signals, carrying out high-pass filtering on the mixed downlink DOCSIS radio frequency signals and the CATV radio frequency signals, and outputting mixed signals of the CATV radio frequency signals and the high-frequency downlink DOCSIS radio frequency signals.

Preferably, the frequency mixing device is further configured to receive multiple uplink DOCSIS radio frequency signals, perform low-pass filtering on the multiple uplink DOCSIS radio frequency signals, mix the multiple low-frequency uplink DOCSIS radio frequency signals obtained after the low-pass filtering, and send the mixed low-frequency uplink DOCSIS radio frequency signals to the DOCSIS EOC data module;

the DOCSIS EOC data module is further configured to receive the mixed low-frequency uplink DOCSIS radio frequency signal sent by the mixing device, convert the low-frequency uplink DOCSIS radio frequency signal into an uplink ethernet data signal corresponding to the low-frequency uplink DOCSIS radio frequency signal according to a DOCSIS protocol, and send the uplink ethernet data signal to the uplink module;

the uplink module is further configured to receive an uplink ethernet data signal sent by the DOCSIS EOC data module, perform service mapping and service switching processing on the uplink ethernet data signal, and output the processed uplink ethernet data signal.

Preferably, the frequency mixing device is specifically configured to distribute the downstream DOCSIS radio frequency signals into multiple downstream DOCSIS radio frequency signals, attenuate each downstream DOCSIS radio frequency signal, amplify each attenuated downstream DOCSIS radio frequency signal, mix each amplified downstream DOCSIS radio frequency signal with the CATV radio frequency signal, and output the mixed signal of the CATV radio frequency signal and the high-frequency downstream DOCSIS radio frequency signal after high-pass filtering.

The invention also provides a frequency mixing system, wherein the second frequency mixing system comprises a frequency mixing device, a DOCSIS EOC data module and an uplink module; wherein,

the frequency mixing device is used for receiving a plurality of paths of uplink DOCSIS radio frequency signals, performing low-pass filtering on the plurality of paths of uplink DOCSIS radio frequency signals, mixing the plurality of paths of low-frequency uplink DOCSIS radio frequency signals obtained after the low-pass filtering, and sending the mixed low-frequency uplink DOCSIS radio frequency signals to the DOCSIS EOC data module;

the DOCSIS EOC data module is configured to receive the mixed low-frequency uplink DOCSIS radio frequency signal sent by the frequency mixing device, convert the low-frequency uplink DOCSIS radio frequency signal into an uplink ethernet data signal corresponding to the low-frequency uplink DOCSIS radio frequency signal according to a DOCSIS protocol, and send the uplink ethernet data signal to the uplink module;

and the uplink module is used for receiving the uplink Ethernet data signal sent by the DOCSIS EOC data module, performing service mapping and service switching processing on the uplink Ethernet data signal, and outputting the processed uplink Ethernet data signal.

The present invention also provides a frequency mixing apparatus, comprising: the DOCSIS radio frequency signal receiving and processing module, the frequency mixing module and the filtering output module; wherein,

the DOCSIS radio frequency signal receiving and processing module is used for receiving downlink DOCSIS radio frequency signals, correspondingly processing the downlink DOCSIS radio frequency signals and sending the processed downlink DOCSIS radio frequency signals to the frequency mixing module;

the frequency mixing module is used for receiving CATV radio frequency signals and mixing downlink DOCSIS radio frequency signals sent by the DOCSIS radio frequency signal receiving and processing module with the CATV radio frequency signals;

and the filtering output module is used for carrying out high-pass filtering on the mixed downlink DOCSIS radio-frequency signals and CATV radio-frequency signals and outputting mixing signals of the CATV radio-frequency signals and high-frequency downlink DOCSIS radio-frequency signals.

Preferably, the mixing device further comprises a second DOCSIS rf signal receiving and processing module, wherein,

the second DOCSIS radio frequency signal receiving and processing module is configured to mix multiple low-frequency uplink DOCSIS radio frequency signals obtained after the low-pass filtering, and send the mixed low-frequency uplink DOCSIS radio frequency signals to the DOCSIS EOC data module;

and the filtering output module is also used for receiving the multi-path uplink DOCSIS radio frequency signals and carrying out low-pass filtering on the multi-path uplink DOCSIS radio frequency signals.

Preferably, the DOCSIS radio frequency signal receiving and processing module is specifically configured to distribute the downlink DOCSIS radio frequency signals into multiple downlink DOCSIS radio frequency signals, attenuate each downlink DOCSIS radio frequency signal, amplify each downlink DOCSIS radio frequency signal, and send each amplified downlink DOCSIS radio frequency signal to the frequency mixing module.

Preferably, the DOCSIS radio frequency signal receiving and processing module includes: the frequency mixing module comprises a branch distributor, and the filtering output module comprises a high-low pass filter; wherein,

the first distributor is used for distributing the downlink DOCSIS radio frequency signals into a plurality of downlink DOCSIS radio frequency signals;

the adjustable attenuator is used for attenuating each path of downlink DOCSIS radio frequency signals;

the amplifier is used for amplifying each path of downlink DOCSIS radio frequency signals;

the branch distributor is used for mixing each path of amplified downlink DOCSIS radio frequency signals with CATV radio frequency signals respectively;

and the high-low pass filter is used for performing high-pass filtering on the downstream DOCSIS radio-frequency signal and the CATV radio-frequency signal after the frequency mixing of the branch distributor and outputting the frequency mixing signal of the CATV radio-frequency signal and the high-frequency downstream DOCSIS radio-frequency signal.

Preferably, the second DOCSIS rf signal receiving and processing module includes a second distributor, wherein,

the second distributor is used for mixing the multiple low-frequency uplink DOCSIS radio-frequency signals and outputting the mixed low-frequency uplink DOCSIS radio-frequency signals;

and the high-low pass filter is also used for carrying out low pass filtering on the multi-path uplink DOCSIS radio frequency signals and sending the multi-path low-frequency uplink DOCSIS radio frequency signals to the second distributor.

The invention also provides a frequency mixing device, wherein the second frequency mixing device comprises a filtering output module and a second DOCSIS radio frequency signal receiving and processing module; wherein,

the filtering output module is used for receiving a plurality of paths of uplink DOCSIS radio frequency signals and performing low-pass filtering on the plurality of paths of uplink DOCSIS radio frequency signals;

and the second DOCSIS radio frequency signal receiving and processing module is used for mixing the multi-path low-frequency uplink DOCSIS radio frequency signals obtained after the low-pass filtering and sending the mixed low-frequency uplink DOCSIS radio frequency signals to the DOCSIS EOC data module.

Preferably, the filtering output module includes a high-low pass filter, and the second DOCSIS rf signal receiving and processing module includes a second divider, wherein,

the high-low pass filter is used for performing low pass filtering on the multiple uplink DOCSIS radio frequency signals and sending the multiple low-frequency uplink DOCSIS radio frequency signals to the second distributor;

and the second distributor is used for mixing the multiple low-frequency uplink DOCSIS radio-frequency signals and outputting the mixed low-frequency uplink DOCSIS radio-frequency signals.

The invention also provides a frequency mixing method, which comprises the following steps:

receiving a downlink Ethernet data signal, and performing service mapping and service switching processing on the downlink Ethernet data signal;

converting downlink Ethernet data signals after service mapping and service switching processing into downlink DOCSIS radio frequency signals corresponding to the downlink Ethernet data signals according to an Ethernet data interface protocol;

and receiving the CATV radio frequency signal, mixing the CATV radio frequency signal with the downlink DOCSIS radio frequency signal, and outputting a mixing signal of the CATV radio frequency signal and the high-frequency downlink DOCSIS radio frequency signal after high-pass filtering.

Preferably, the method further comprises:

receiving a plurality of paths of uplink DOCSIS radio frequency signals, carrying out low-pass filtering on the plurality of paths of uplink DOCSIS radio frequency signals, and mixing the plurality of paths of low-frequency uplink DOCSIS radio frequency signals obtained after the low-pass filtering;

converting the mixed low-frequency uplink DOCSIS radio frequency signals into uplink Ethernet data signals corresponding to the uplink low-frequency DOCSIS radio frequency signals according to an Ethernet data interface protocol;

and performing service mapping and service switching processing on the uplink Ethernet data signal, and outputting the processed uplink Ethernet data signal.

Preferably, the mixing the CATV radio frequency signal with the downstream DOCSIS radio frequency signal, and outputting the mixed signal of the CATV radio frequency signal and the high-frequency downstream DOCSIS radio frequency signal after the high-pass filtering includes:

distributing the downstream DOCSIS radio frequency signal into a plurality of downstream DOCSIS radio frequency signals, attenuating each downstream DOCSIS radio frequency signal, amplifying each attenuated downstream DOCSIS radio frequency signal, mixing each amplified downstream DOCSIS radio frequency signal with the CATV radio frequency signal respectively, and outputting the mixing signal of the CATV radio frequency signal and the high-frequency downstream DOCSIS radio frequency signal after high-pass filtering.

The present invention further provides a frequency mixing method, where the second frequency mixing method includes:

receiving a downlink Ethernet data signal, and performing service mapping and service switching processing on the downlink Ethernet data signal;

converting downlink Ethernet data signals after service mapping and service switching processing into downlink DOCSIS radio frequency signals corresponding to the downlink Ethernet data signals according to an Ethernet data interface protocol;

and performing service mapping and service switching processing on the uplink Ethernet data signal, and outputting the processed uplink Ethernet data signal.

The frequency mixing system, the frequency mixing device and the frequency mixing method provided by the invention can realize the frequency mixing output of the multiple CATV radio-frequency signals and the DOCSIS radio-frequency signals, and solve the problem that the performances of the head-end equipment, such as load capacity, transmission distance and the like, are reduced along with the frequency mixing of the multiple CATV radio-frequency signals and the DOCSIS radio-frequency signals; and, can output CATV radio frequency signal and DOCSIS radio frequency signal stable, reliable, and accord with the relevant technical standard of the country, have also met the demands on load capacity, network coverage, high-frequency signal quality, etc. of the head-end equipment of the operator at the same time.

In addition, The invention combines PON technology and DOCSIS technology To realize The copper cable access and multi-service bearing function of The last kilometer of Fiber To The Home (FTTH, Fiber To The Home) of The copper cable operator, and reserves The CM of The DOCSIS background management platform and The user terminal network side in The original HFC network, thereby protecting The original network investment; the invention can be applied To various scenes such as Fiber To The Building (FTTB), Fiber To The Node (FTTN), Fiber To The roadside (FTTC), and The like, greatly improves The load capacity and The transmission distance of head-end equipment, and simultaneously meets The signal receiving intensity standard of terminal equipment such as CM, STB or cable television and The like at The network side of a user terminal.

Drawings

FIG. 1 is a schematic diagram of the structure of the mixing system according to the present invention;

FIG. 2 is a schematic diagram of a structure of a mixer apparatus according to the present invention;

FIG. 3 is a schematic block diagram of an implementation of the mixing apparatus of the present invention;

fig. 4 is a schematic flow chart of the implementation of the mixing method of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Fig. 1 is a schematic diagram of a mixing system according to the present invention, and as shown in fig. 1, the mixing system includes an uplink module 10, a DOCSIS EOC data module 11, and a mixing apparatus 12, wherein:

the uplink module 10 is configured to receive a downlink ethernet data signal, perform service mapping and service switching processing on the downlink ethernet data signal, and send the processed downlink ethernet data signal to the DOCSIS EOC data module 11;

the DOCSIS EOC data module 11 is configured to receive a downlink ethernet data signal sent by the uplink module 10, convert the downlink ethernet data signal into a downlink DOCSIS radio frequency signal corresponding to the downlink ethernet data signal according to an ethernet data interface protocol, and send the downlink DOCSIS radio frequency signal to the frequency mixing device 12;

the mixing device 12 is configured to receive a downlink DOCSIS radio frequency signal sent by the DOCSIS EOC data module 11; the high-pass filtering device is also used for receiving CATV radio frequency signals, mixing the downlink DOCSIS radio frequency signals with the CATV radio frequency signals, performing high-pass filtering on the mixed downlink DOCSIS radio frequency signals and CATV radio frequency signals, and outputting mixing signals of the CATV radio frequency signals and high-frequency downlink DOCSIS radio frequency signals.

Specifically, the frequency mixing device 12 is specifically configured to distribute the downlink DOCSIS radio frequency signals into multiple downlink DOCSIS radio frequency signals, attenuate each downlink DOCSIS radio frequency signal, amplify each attenuated downlink DOCSIS radio frequency signal, mix each amplified downlink DOCSIS radio frequency signal with the CATV radio frequency signal, and output the mixed signal of the CATV radio frequency signal and the high-frequency downlink DOCSIS radio frequency signal after high-pass filtering.

Specifically, the frequency mixing device 12 includes: a DOCSIS radio frequency signal receiving and processing module 121, a mixing module 122 and a filtering output module 123; wherein,

the DOCSIS radio frequency signal receiving and processing module 121 is configured to receive a downlink DOCSIS radio frequency signal, perform corresponding processing on the downlink DOCSIS radio frequency signal, and send the processed downlink DOCSIS radio frequency signal to the frequency mixing module 122;

the frequency mixing module 122 is configured to receive CATV radio frequency signals, and mix the received downlink DOCSIS radio frequency signals sent by the DOCSIS radio frequency signal receiving and processing module 121 with the CATV radio frequency signals;

the filtering output module 123 is configured to perform high-pass filtering on the mixed downlink DOCSIS radio frequency signal and CATV radio frequency signal, and output a mixing signal of the CATV radio frequency signal and a high-frequency downlink DOCSIS radio frequency signal.

Specifically, the DOCSIS radio frequency signal receiving and processing module 121 is specifically configured to distribute the downlink DOCSIS radio frequency signals into multiple downlink DOCSIS radio frequency signals, attenuate each downlink DOCSIS radio frequency signal, amplify each downlink DOCSIS radio frequency signal, and send each amplified downlink DOCSIS radio frequency signal to the frequency mixing module 122.

Here, the DOCSIS radio frequency signal receiving processing module 121 includes: a first distributor, an adjustable attenuator and an amplifier, the mixing module 122 comprises a branch distributor, and the filtering output module 123 comprises a high-low pass filter; wherein,

the first distributor is used for distributing the downlink DOCSIS radio frequency signals into a plurality of downlink DOCSIS radio frequency signals;

the adjustable attenuator is used for attenuating each path of downlink DOCSIS radio frequency signals;

the amplifier is used for amplifying each path of downlink DOCSIS radio frequency signals;

the branch distributor is used for mixing each path of amplified downlink DOCSIS radio frequency signals with CATV radio frequency signals respectively;

and the high-low pass filter is used for performing high-pass filtering on the downstream DOCSIS radio-frequency signal and the CATV radio-frequency signal after the frequency mixing of the branch distributor and outputting the frequency mixing signal of the CATV radio-frequency signal and the high-frequency downstream DOCSIS radio-frequency signal.

Here, the downlink ethernet data signal is sent out by an upper layer aggregation network side, where the upper layer aggregation network side includes a PON, an ethernet, and the like; the upper connection module 11 communicates with the upper convergence network side through an interface, the interface mode can be flexibly configured, and a PON interface or a Gigabit Ethernet (GE) interface can be adopted;

the CATV radio frequency signal is a multi-channel CATV radio frequency signal sent by the optical receiver, and is not limited to a Digital Video Broadcasting (DVB) standard signal, but also can be a DVB-T standard signal or a DVB-S standard signal;

the mixed signal output from the mixing device 12 is transmitted to a terminal device such as a CM, an STB, or a cable television set on the user terminal network side.

Here, the mixing system may be provided inside a head end device of an access network.

Specifically, the frequency mixing device 12 is further configured to receive multiple uplink DOCSIS radio frequency signals, perform low-pass filtering on the multiple uplink DOCSIS radio frequency signals, mix the multiple low-frequency uplink DOCSIS radio frequency signals obtained after the low-pass filtering, and send the mixed low-frequency uplink DOCSIS radio frequency signals to the DOCSIS EOC data module 11;

the DOCSIS EOC data module 11 is further configured to receive the mixed low-frequency uplink DOCSIS radio frequency signal sent by the mixing device 12, convert the low-frequency uplink DOCSIS radio frequency signal into an uplink ethernet data signal corresponding to the low-frequency uplink DOCSIS radio frequency signal according to a DOCSIS protocol, and send the uplink ethernet data signal to the uplink module 10;

the uplink module 10 is further configured to receive an uplink ethernet data signal sent by the DOCSIS EOC data module, perform service mapping and service switching processing on the uplink ethernet data signal, and output the processed uplink ethernet data signal.

Specifically, the mixing device 12 further includes a second DOCSIS rf signal receiving and processing module 124, wherein,

the second DOCSIS radio frequency signal receiving and processing module 124 is configured to mix multiple low-frequency uplink DOCSIS radio frequency signals obtained after the low-pass filtering, and send the mixed low-frequency uplink DOCSIS radio frequency signals to the DOCSIS EOC data module 11;

the filtering output module 123 is further configured to receive a plurality of uplink DOCSIS radio frequency signals, and perform low-pass filtering on the plurality of uplink DOCSIS radio frequency signals.

Here, the second DOCSIS rf signal receiving and processing module 124 includes a second distributor, wherein,

the second distributor is used for mixing the multiple low-frequency uplink DOCSIS radio-frequency signals and outputting the mixed low-frequency uplink DOCSIS radio-frequency signals;

and the high-low pass filter is also used for carrying out low pass filtering on the multi-path uplink DOCSIS radio frequency signals and sending the multi-path low-frequency uplink DOCSIS radio frequency signals to the second distributor.

Here, the uplink ethernet data signal is sent by a terminal device such as a CM or an STB on the network side of the user terminal; the uplink module 10 sends the uplink ethernet data signal to the upper convergence network side.

Specifically, the present invention further provides a frequency mixing system, where the second frequency mixing system includes a frequency mixing device 12, a DOCSIS EOC data module 11, and an uplink module 10; wherein,

the frequency mixing device 12 is configured to receive multiple uplink DOCSIS radio frequency signals, perform low-pass filtering on the multiple uplink DOCSIS radio frequency signals, mix the multiple low-frequency uplink DOCSIS radio frequency signals obtained after the low-pass filtering, and send the mixed low-frequency uplink DOCSIS radio frequency signals to the DOCSIS EOC data module 11;

the DOCSIS EOC data module 11 is configured to receive the mixed low-frequency uplink DOCSIS radio frequency signal sent by the mixing device 12, convert the low-frequency uplink DOCSIS radio frequency signal into an uplink ethernet data signal corresponding to the low-frequency uplink DOCSIS radio frequency signal according to a DOCSIS protocol, and send the uplink ethernet data signal to the uplink module 10;

the uplink module 10 is configured to receive an uplink ethernet data signal sent by the DOCSIS EOC data module, perform service mapping and service switching processing on the uplink ethernet data signal, and output the processed uplink ethernet data signal.

Specifically, the frequency mixing device 12 includes a filtering output module 123 and a second DOCSIS radio frequency signal receiving and processing module 124; wherein,

the filtering output module 123 is configured to receive multiple uplink DOCSIS radio frequency signals and perform low-pass filtering on the multiple uplink DOCSIS radio frequency signals;

the second DOCSIS radio frequency signal receiving and processing module 124 is configured to mix multiple low-frequency uplink DOCSIS radio frequency signals obtained after the low-pass filtering, and send the mixed low-frequency uplink DOCSIS radio frequency signals to the DOCSIS EOC data module 11.

Here, the filtering output module 123 includes a high-low pass filter, and the second DOCSIS rf signal receiving and processing module 124 includes a second divider, wherein,

the high-low pass filter is used for performing low pass filtering on the multiple uplink DOCSIS radio frequency signals and sending the multiple low-frequency uplink DOCSIS radio frequency signals to the second distributor;

and the second distributor is used for mixing the multiple low-frequency uplink DOCSIS radio-frequency signals and outputting the mixed low-frequency uplink DOCSIS radio-frequency signals.

Specifically, the present invention further provides a frequency mixing device, where the second frequency mixing device includes a filtering output module 123 and a second DOCSIS radio frequency signal receiving and processing module 124; wherein,

the filtering output module 123 is configured to receive multiple uplink DOCSIS radio frequency signals and perform low-pass filtering on the multiple uplink DOCSIS radio frequency signals;

and the second DOCSIS radio frequency signal receiving and processing module 124 is configured to mix the multiple low-frequency uplink DOCSIS radio frequency signals obtained after the low-pass filtering, and output the mixed low-frequency uplink DOCSIS radio frequency signals.

Here, the filtering output module 123 includes a high-low pass filter, and the second DOCSIS rf signal receiving and processing module 124 includes a second divider, wherein,

the high-low pass filter is used for performing low pass filtering on the multiple uplink DOCSIS radio frequency signals and sending the multiple low-frequency uplink DOCSIS radio frequency signals to the second distributor;

and the second distributor is used for mixing the multiple low-frequency uplink DOCSIS radio-frequency signals and outputting the mixed low-frequency uplink DOCSIS radio-frequency signals.

Fig. 3 is a schematic block diagram of an implementation of the frequency mixing apparatus of the present invention, as shown in fig. 3, the frequency mixing apparatus includes: a first distributor 30, an adjustable attenuator 31, an amplifier 32, a branch distributor 33, a high-low pass filter 34, and a second distributor 35; wherein,

the first distributor 30 is configured to distribute downlink DOCSIS radio frequency signals into multiple downlink DOCSIS radio frequency signals;

the adjustable attenuator 31 is configured to attenuate each downlink DOCSIS radio frequency signal;

the amplifier 32 is configured to amplify each downlink DOCSIS radio frequency signal;

the branch distributor 33 is configured to mix each amplified downlink DOCSIS radio frequency signal with a CATV radio frequency signal;

the high-low pass filter 34 is configured to perform high-pass filtering on the downstream DOCSIS radio-frequency signal and the CATV radio-frequency signal after the frequency mixing by the branch distributor 33, and output a frequency-mixed signal of the CATV radio-frequency signal and the high-frequency downstream DOCSIS radio-frequency signal; the second splitter 35 is further configured to perform low-pass filtering on the multiple uplink DOCSIS radio frequency signals and send the multiple low-frequency uplink DOCSIS radio frequency signals to the multiple uplink DOCSIS radio frequency signals;

the second distributor 35 is configured to mix multiple low-frequency uplink DOCSIS radio frequency signals, and output the mixed low-frequency uplink DOCSIS radio frequency signal.

Specifically, the second distributor 35 may send the mixed low-frequency upstream DOCSIS radio frequency signal to the DOCSIS EOC module.

Specifically, the amplifier 32 is a high-power radio frequency signal amplifier with a wide linear range, a wide working frequency range and a strong amplification capability; preferably, the linear working power output of the amplifier can reach more than 115dBuV, the working frequency band can reach more than 1GHz, and the gain can reach more than 20 dB.

Here, the first divider 30, the adjustable attenuator 31, the amplifier 32, the branch divider 33, the high-low pass filter 34, and the second divider 35 may be integrated on a single Printed Circuit Board (PCB). Specifically, one end of the first distributor 30 is connected to one end of the adjustable attenuator 31, and the other end is connected to an external DOCSIS EOC module; the other end of the adjustable attenuator 31 is connected with one end of an amplifier 32; the other end of the amplifier 32 is connected to one end of a branch distributor 33; the other end of the branch distributor 33 is connected with one end of a high-low pass filter 34; the other end of the high-low pass filter 34 is connected to one end of a second divider 35; the other end of the second distributor 25 is connected to an external DOCSIS EOC module.

Here, if the DOCSIS rf signal strength is too high, saturation distortion is easily generated after mixing with the CATV rf signal, and the third Order Beat combined distortion (CTB) and the Second Order Beat combined distortion (CSO) indexes generated in the high frequency operating band are degraded, thereby affecting the quality of the CATV rf signal and the DOCSIS rf signal. Therefore, after the downlink DOCSIS radio frequency signal is divided into multiple DOCSIS radio frequency signals by the first distributor 30, the adjustable attenuator 31 needs to perform signal attenuation on the DOCSIS radio frequency signal according to the strength of the DOCSIS radio frequency signal, so that the DOCSIS radio frequency signal in the finally output mixing signal can meet the signal receiving strength standard of terminal devices such as a CM and an STB on the user terminal network side, and will not have an excessive influence on the CATV radio frequency signal.

Here, CATV radio frequency signals are used as radio frequency signals that are already mature and widely existing in the existing HFC network, and in the whole mixing process, the original network condition should be kept as much as possible, and the signal strength and the index of the CATV radio frequency signals need to be protected and used as much as possible. Therefore, when the branch distributor 33 mixes the CATV rf signal with the DOCSIS rf signal, the insertion loss of the CATV rf signal is minimized to be less than 2 dB; the insertion loss of the mixing signal of the CATV radio frequency signal and the DOCSIS radio frequency signal is mainly reduced by sacrificing the insertion loss of the DOCSIS radio frequency signal, so that the original CATV radio frequency signal is protected as much as possible.

Fig. 4 is a schematic flow chart of an implementation of the method for implementing mixed output according to the present invention, as shown in fig. 4, the method includes the following steps:

step 401: receiving a downlink Ethernet data signal, and performing service mapping and service switching processing on the downlink Ethernet data signal;

the above processing is the same as the prior art, and is not described herein again;

step 402: converting downlink Ethernet data signals after service mapping and service switching processing into downlink DOCSIS radio frequency signals corresponding to the downlink Ethernet data signals according to an Ethernet data interface protocol;

here, the conversion between the ethernet data signal and the DOCSIS rf signal is the same as the conversion on the physical layer in the prior art.

Step 403: and receiving the CATV radio frequency signal, mixing the CATV radio frequency signal with the downlink DOCSIS radio frequency signal, and outputting a mixing signal of the CATV radio frequency signal and the high-frequency downlink DOCSIS radio frequency signal after high-pass filtering.

Specifically, the method further comprises:

receiving a plurality of paths of uplink DOCSIS radio frequency signals, performing low-pass filtering on the plurality of paths of uplink DOCSIS radio frequency signals, and mixing the plurality of paths of low-frequency uplink DOCSIS radio frequency signals obtained after the low-pass filtering;

here, the mixing is: and mixing the multiple low-frequency uplink DOCSIS radio frequency signals into one low-frequency uplink DOCSIS radio frequency signal.

Converting the mixed low-frequency uplink DOCSIS radio frequency signals into uplink Ethernet data signals corresponding to the uplink low-frequency DOCSIS radio frequency signals according to an Ethernet data interface protocol;

here, the conversion between the DOCSIS rf signal and the ethernet data signal is the same as the prior art.

And performing service mapping and service switching processing on the uplink Ethernet data signal, and outputting the processed uplink Ethernet data signal.

Specifically, the mixing the CATV radio frequency signal with the downlink DOCSIS radio frequency signal, and outputting the mixed signal of the CATV radio frequency signal and the high-frequency downlink DOCSIS radio frequency signal after high-pass filtering includes:

distributing the downstream DOCSIS radio frequency signal into a plurality of downstream DOCSIS radio frequency signals, attenuating each downstream DOCSIS radio frequency signal, amplifying each attenuated downstream DOCSIS radio frequency signal, mixing each amplified downstream DOCSIS radio frequency signal with the CATV radio frequency signal respectively, and outputting the mixing signal of the CATV radio frequency signal and the high-frequency downstream DOCSIS radio frequency signal after high-pass filtering.

Here, the amplification of each path of the attenuated downlink DOCSIS radio frequency signals is performed by a high-power radio frequency signal amplifier with a wide linear range, a wide operating frequency range, and a strong amplification capability.

Specifically, the present invention further provides a frequency mixing method, where the second frequency mixing method includes:

receiving a plurality of paths of uplink DOCSIS radio frequency signals, performing low-pass filtering on the plurality of paths of uplink DOCSIS radio frequency signals, and mixing the plurality of paths of low-frequency uplink DOCSIS radio frequency signals obtained after the low-pass filtering;

here, the mixing is to mix multiple low frequency uplink DOCSIS radio frequency signals into one path.

Converting the mixed low-frequency uplink DOCSIS radio frequency signals into uplink Ethernet data signals corresponding to the uplink low-frequency DOCSIS radio frequency signals according to an Ethernet data interface protocol;

and performing service mapping and service switching processing on the uplink Ethernet data signal, and outputting the processed uplink Ethernet data signal.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.