TWM464938U - Cable modem capable of performing signal attenuation processing for broadband network - Google Patents

Description

Cable modem with broadband signal attenuation for broadband networks

The present invention relates to a cable data machine, and more particularly to a cable data machine that utilizes a duplexer to attenuate radio frequency signals in an uplink transmission channel and a downlink transmission channel of a broadband network trunk signal, respectively.

With the popularization of cable TV services, the development of broadband network technology has been promoted. Users can use the cable TV (CableModem; CM) at home to use the existing fiber-optic coaxial hybrid line (Hybrid Fiber Coaxial; HFC). The network serves as a route for data transmission.

Next, please refer to FIG. 1 , which is a network transmission point (NetworkAdaptation Point) of the existing transmission broadband network trunk signal as a data transmission pipeline between the user terminal and the Cable Modem Termination Systems (CMTS). The cable modem terminal system 10 synthesizes the cable television spectrum into a single radio frequency (RF), transmits the signal through the HFC network, and uses the coaxial cable when entering the service area of the client 120. 11 is connected to the cable modem 12 which is set as a sinking divergence point or a network dip point.

The output power of the RF signal transmitted in the trunk of the HFC network is generally 80dBm, which does not meet the -15dBm~+15dBm limit of the cable modem specification. In order for the cable data machine to operate normally, it is often necessary to An attenuator is provided at the front end of the RF input port of the cable modem to attenuate the output power of the fed RF signal to conform to the specifications of the cable modem. However, the attenuation of the existing attenuator is fixed, and because of the location of the cable data machine or the difference of its brand, there is a need for different attenuation amounts. Therefore, it is often difficult to obtain the cable installed on site during installation. The line modem has a matching attenuator, which increases the difficulty of setting the network connection point, and may also cause the cable data machine under the network connection point to not work properly.

Based on the above problems, how to effectively attenuate the RF signal output power fed to the cable data machine, thereby facilitating the setting of the cable data machine at the network connection point, is an urgent problem to be solved by those skilled in the art.

In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a cable modem having a broadband signal attenuation processing for a broadband network, so that the cable modem provides normal transmission performance.

Another object of the present invention is to provide a cable data machine with a broadband signal attenuation processing for a broadband network, which makes the setting of the network connection point easier and more convenient.

To achieve the above and other related purposes, the present invention provides a cable data machine having a broadband signal attenuation processing for a broadband network, the cable data machine comprising: a first stage duplexer having a first stage downlink frequency band filtering And a first-stage uplink frequency band filter, wherein the first-stage downlink frequency band filter is configured to suppress noise of the trunk signal fed from the broadband network, and output a first-stage downlink channel signal; and the first-stage uplink frequency band The filter is configured to suppress noise of the first-stage uplink channel signal to be transmitted back to the trunk signal of the broadband network; and the downlink attenuation unit is configured to attenuate the first-level downlink outputted by the first-stage downlink frequency band filter The output power of the channel signal is outputted to output the downlink channel attenuation signal; and the second-stage duplexer has a second-stage downlink band filter and a second-stage up-band filter, and the second-stage downlink band filter is used for suppressing The downlink channel of the downlink attenuation unit attenuates the noise of the signal to output a second-level downlink signal for transmission to the UE; the second-stage uplink frequency filter The second stage is used for the uplink signal transmitted from the UE perform noise suppression processing to the output of the first stage of the first stage up channel signal filter processing for upstream band.

In addition, the cable data machine having the attenuation processing for the broadband network trunk signal has an uplink attenuation unit for attenuating the output power of the second-stage uplink channel signal outputted by the second-stage uplink frequency band filter. And outputting the first-stage uplink channel signal for performing noise suppression processing on the first-stage uplink frequency band filter.

Furthermore, in the cable data machine having the broadband signal attenuation processing for the broadband network, the complex includes: a data processing module having a network interface and a wireless access point module, by using the network interface and the wireless storage The point module is connected so that the cable modem becomes a router for providing wireless network login and access.

In addition, the cable data machine having the broadband signal attenuation processing for the broadband network includes: a data processing module having a network interface and a base station module, wherein the network interface and the base station module The connection makes the cable modem a communication device for the mobile communication network architecture.

According to the above-mentioned cable data machine for broadband signal attenuation processing of the broadband network, the two-stage duplexer filter enables the cable data machine to transmit with the CMTS with good signals, and by using a two-stage duplexer (Diplexer Filter). The downlink attenuation unit and the uplink attenuation unit (Attenuation) allow the installer of the cable data machine to adjust the attenuation value of the attenuation unit according to the installation environment or the quality of the copper cable line, so that the output power between the cable data machine and the CMTS conforms to each other. The operating specifications, and can maintain a better transmission performance.

The technical content of the present invention will be described below by way of specific embodiments, and those skilled in the art can easily understand the advantages and effects of the present invention by the contents disclosed in the present specification. This creation can also be implemented or applied by other different embodiments. The details in this manual can also be based on different opinions and applications, and various modifications and changes can be made without departing from the spirit of this creation.

This creation has a cable data processor for wideband network trunk signal attenuation processing, mainly using a built-in signal attenuation circuit module to attenuate the trunk signal transmitted from the network trunk to make the feed trunk The output power of the signal is reduced to meet the specification of the cable data machine, so that its internal data processing module can operate. To clearly illustrate the cable data machine for the attenuation processing of the broadband network trunk signal, the following will be Three embodiments illustrate the operation of this creation.

First, as shown in FIG. 2, which is a basic system architecture block diagram of a first embodiment of a cable data machine having a broadband network trunk signal attenuation process, the cable data machine 2 of the present embodiment includes: The signal attenuation circuit module of the first-stage duplexer 20, the downlink attenuation unit 21, and the second-stage duplexer 23. It should be noted that, in order to simplify the description, only the components related to the main features of the present invention and their functions are explained below for the circuit architecture herein, and other electronic components, such as power supply units and the like, and their functions will be omitted.

As shown in FIG. 2, the cable modem 2 is provided with an RF signal 埠27 for connecting to a coaxial cable (not shown) for transmitting a broadband network trunk signal. The RF signal 埠27 feeds the network trunk signal to the first stage duplexer 20, or the signal processed by the first stage duplexer 20 is transmitted to the coaxial cable, so that the cable data machine 2 transmits the signal Coaxial cable to communicate with the remote Cable Modem Termination Systems (CMTS). The first-stage duplexer 20 has a first-stage downlink frequency band filter 200 and a first-stage uplink frequency band filter 201. Since the bandwidth of the coaxial cable is relatively large, generally 5 to 42 MHz is used as an uplink frequency transmission channel, and 50 ~860MHz is used as the downlink frequency transmission channel. Even if the downlink frequency transmission channel is interfered by the interference noise, the noise is less than that of the uplink frequency transmission channel. However, the downlink data is transmitted to the cable data system 2 by the CMTS in a broadcast manner. The interference with the external intrusion noise is also encountered. Therefore, the cable data machine 2 of the present invention divides the RF signal fed from the RF signal 埠27 into uplink and downlink data by the first-stage duplexer 20. And also suppress the interference of noise. Specifically, the first-stage downlink frequency band filter 200 suppresses the noise of the trunk signal fed by the broadband network, and outputs the first-stage downlink channel signal, where the first-stage downlink frequency band filter 200 can be High-pass filter to extract data from the downstream band.

In addition, as described above, since the output power of the fed RF signal is relatively large, the downlink attenuation unit 21 attenuates the output power of the first-stage downlink channel signal outputted from the first-stage downlink frequency band filter 200. The downlink channel attenuation signal is output to reduce the output power of the fed-in trunk signal to conform to the cable data machine specification, so that the data processing module 24 at the back end thereof is operated. The so-called data processing module 24 is herein. It is a circuit module for realizing general CM functions, and the circuit module includes a modulation module, a demodulation module, a tuner, an encryption/decryption module, a bridge, a network interface card, and the like. The data transmission processing performed below is not necessary for the data processing module 24 as an essential component of the existing CM.

In order to reduce the interference noise of the downlink signal processed by the data processing module 24, the downlink attenuation component 21 is suppressed by the second-stage downlink frequency band filter 230 in the second-stage duplexer 23. The output of the downlink channel attenuation signal noise can output a second-level downlink signal that isolates the downlink channel interference source, and the second-stage downlink frequency band filter 230 can be a high-pass filter to effectively filter the noise in the downlink frequency band.

As can be seen from the above, the cable modem 2 of the present embodiment transmits the RF signal fed from the RF signal 埠27 to the downlink channel signal through the first-stage downlink band filter 200, and also suppresses the interference noise. The downlink channel signal of the high output power is attenuated by the downlink attenuation unit 21, and then the second stage downlink frequency band filter 230 is used to suppress the noise of the downlink channel signal after the signal attenuation processing of the downlink attenuation unit 21. Thus, the data processing module 24 is provided to provide a stable transfer operation.

Furthermore, regarding the data processing module 24 transmitting the data uploaded by the client to the CMTS, the data processing module 24 first transmits the data uploaded by the client to the second-level duplex. The second stage up-band filter 231 of the second-stage duplexer 23 filters out the uplink channel signal, and further suppresses the interference noise of the uplink channel signal, and the second-stage uplink frequency band filtering The 231 can be a low pass filter to extract data from the upstream frequency band.

Then, the uplink channel signal is transmitted to the first-stage uplink frequency band filter 201 in the first-stage duplexer 20, so that the uplink channel signal performs the second noise interference, because the HFC network is in the HFC network. The user terminal in the same uplink channel is used to transmit the data uploaded to the CMTS. Therefore, the noise generated by most clients in the uplink channel is accumulated and also transmitted to the CMTS. Therefore, the second channel is transmitted to the CMTS. The uplink channel signal filtered by the second-stage up-band filter 231 of the duplexer 23 and the uplink channel signal processed by the noise suppression are transmitted to the first-stage uplink frequency band filtering in the first-stage duplexer 20. The device 201 performs a second noise suppression process to obtain a more complete uplink channel signal, and then transmits the uplink channel signal to the CMTS through a coaxial cable connected to the RF signal 埠27. The first stage uplink frequency band filter 201 can be a low pass filter to effectively filter the noise of the uplink frequency band.

Next, as shown in FIG. 3, it is a basic system architecture block diagram of a second embodiment of a cable data machine having a broadband network trunk signal attenuation process. For simplicity of explanation, the cable data machine 2 of the present embodiment 'Only the difference from FIG. 2 will be explained. The cable modem 2' of this embodiment further includes an upstream attenuation unit 22. The uplink attenuation unit 22 is disposed between the first-stage uplink frequency band filter 201 of the first-stage duplexer 20 and the second-stage uplink frequency band filter 231 of the second-stage duplexer 23, and generally, the cable The data machine 2' transmits the data uploaded by the client to the CMTS. When the output power of the cable data machine 2' is too low, although the CMTS can still receive the uploaded data, the signal of the uploaded data is not Good, therefore, in order to solve this problem, the installer of the cable modem 2' can increase the attenuation value through the uplink attenuation unit 22, so that the cable modem 2' has a lower attenuation output power, which is low. The CMTS does not receive the data uploaded by the client. In this case, the CMTS notifies the data processing module 24 of the cable modem 2' to adjust its output power, so the data processing module 24 is correspondingly increased. The output power is adjusted to be high enough for the CMTS to receive the signal for uploading the data. Then, the installer of the cable data machine 2' adjusts the attenuation value of the uplink attenuation unit 22 to 0 dB, so that the CMTS can receive more. A good signal to upload data.

It can be seen from the above that the downlink attenuation unit and the uplink attenuation unit of the cable data machine of the present invention are adjustable attenuators, and the attenuation value can be adjusted according to the installation environment or the quality of the copper cable line, so that the cable data machine and the CMTS can be The output powers are in accordance with each other's operating specifications, and can maintain a better transmission performance between each other.

Furthermore, as shown in FIG. 4, it is a basic system architecture block diagram of a third embodiment of a cable data machine having a broadband network trunk signal attenuation processing. For simplicity of explanation, the cable data machine of the present embodiment 2" is only described in the difference from FIG. 3. The data processing module 24' of the cable data machine 2" of the present embodiment uses a network interface (not shown here) to connect to a wireless access point (Access point; AP). a module 25 and a base station module 26, the cable data machine 2" is a router for providing wireless network login and access by the AP module 25, and the cable data machine 2" The base station module 26 becomes a communication device in the mobile communication network architecture. It is added here that the base station module 26 of this embodiment is, for example, a femtocell. However, if the network interface connected to the data processing module 24' can be exposed on the casing of the cable data machine 2", the base station module connected to the network interface can be a large base station. (Macrocell) or a special micro base station (Picocell), in other words, depending on the implementation type and have different system architectures.

Therefore, it can be seen from the above that the cable data machine with the broadband signal attenuation processing for the broadband network can solve the problem that the output power of the trunk signal is high, and the cable data machine is not easily set, and the HFC network can also be improved. The performance of data transfer operations between cable modems.

The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any person skilled in the art can modify and change the above embodiments without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the rights of this creation should be as claimed in the following.

10‧‧‧Cable data terminal system
11‧‧‧Coaxial cable
12,2,2',2"‧‧‧ cable data machine
120‧‧‧User side
20‧‧‧First-stage duplexer
200‧‧‧First-stage downlink band filter
201‧‧‧First-stage uplink band filter
21‧‧‧Downdown Attenuation Unit
22‧‧‧Upstream attenuation unit
23‧‧‧Second level duplexer
230‧‧‧second-stage downlink band filter
231‧‧‧Second level upstream band filter
24‧‧‧Data Processing Module
25‧‧‧Wire Access Point (AP) Module
26‧‧‧Base Station Module
27‧‧‧RF signal埠

[Fig. 1] A network connection point for displaying an existing transmission broadband network trunk signal as a relationship between a user terminal and a cable data terminal system (CMTS) for data transmission pipelines. [Fig. 2] This creation has a basic system architecture block diagram of a first embodiment of a cable modem for broadband network trunk signal attenuation processing. [Fig. 3] A second embodiment of the cable data machine for illustrating the wideband network trunk signal attenuation processing. [Fig. 4] A third embodiment of a cable modem for illustrating the wideband network trunk signal attenuation processing.

2‧‧‧ Cable Data Machine

20‧‧‧First-stage duplexer

200‧‧‧First-stage downlink band filter

201‧‧‧First-stage uplink band filter

21‧‧‧Downdown Attenuation Unit

23‧‧‧Second level duplexer

230‧‧‧second-stage downlink band filter

231‧‧‧Second level upstream band filter

24‧‧‧Data Processing Module

Claims (11)

A cable data machine having a broadband signal attenuation processing for a broadband network, the cable data machine comprising: a first stage duplexer having a first stage downlink band filter and a first stage uplink band filter, the The first-stage downlink frequency band filter is used for suppressing the noise of the trunk signal fed from the broadband network, and outputting the first-stage downlink channel signal; and the first-stage uplink frequency band filter is used for suppressing the return to the broadband network. The noise of the first-stage uplink channel signal in the trunk signal; the downlink attenuation unit is configured to attenuate the output power of the first-stage downlink channel signal outputted by the first-stage downlink frequency band filter to output the downlink channel attenuation signal And a second-stage duplexer having a second-stage downlink frequency band filter and a second-stage uplink frequency band filter, wherein the second-stage downlink frequency band filter is configured to suppress interference of the downlink channel attenuation signal outputted from the downlink attenuation unit To output a second-level downlink signal transmitted to the UE; the second-stage uplink frequency band filter is used to perform the second-level uplink signal transmitted from the UE. News suppression processing for the first stage to the output signal of the first up channel uplink frequency filter processing stage. The cable data machine with broadband signal attenuation processing for a broadband network, as described in claim 1, wherein the first-stage downlink frequency band filter is a high-pass filter, and the first-stage uplink frequency band filter is low. Pass filter. A cable modem having a broadband network trunk signal attenuation process as described in claim 1, wherein the second-stage downlink band filter is a high-pass filter, and the second-stage uplink band filter is low. Pass filter. A cable data machine having a broadband network trunk signal attenuation process as described in claim 1 has an uplink attenuation unit for attenuating the second stage output from the second stage uplink band filter. The output power of the uplink channel signal, and outputting the first-stage uplink channel signal for the noise suppression processing of the first-stage uplink band filter. A cable modem having a broadband network trunk signal attenuation process as described in claim 4, wherein the uplink attenuation unit is a variable attenuator. A cable modem having a broadband network trunk signal attenuation process as described in claim 5, wherein the adjustable attenuator provides an attenuation value of 0 dB. A cable modem having a broadband signal attenuation process for a broadband network, as described in claim 1, wherein the downstream attenuation unit is a variable attenuator. The cable data machine with the broadband signal attenuation processing for the broadband network as described in claim 1 includes: a data processing module having a network interface and a wireless access point module, wherein the network The road interface is connected to the wireless access point module, so that the cable data machine becomes a router for providing wireless network login and access. The cable data machine with the broadband network trunk signal attenuation processing described in claim 1 includes: a data processing module having a network interface and a base station module, through the network interface The connection with the base station module makes the cable data machine a communication device for the mobile communication network architecture. A cable modem having a broadband network trunk signal attenuation process as described in claim 9 wherein the base station module is a femtocell. A cable modem having a broadband network trunk signal attenuation process as described in claim 9 or 10, wherein the network interface is exposed on a chassis of the cable modem, and the network interface The connected base station module is a large base station (Macrocell) or a special micro base station (Picocell).