CN108965860B - Anti-interference test system, method and device for cable modem downlink signal - Google Patents
Anti-interference test system, method and device for cable modem downlink signal Download PDFInfo
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- CN108965860B CN108965860B CN201810583159.9A CN201810583159A CN108965860B CN 108965860 B CN108965860 B CN 108965860B CN 201810583159 A CN201810583159 A CN 201810583159A CN 108965860 B CN108965860 B CN 108965860B
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Abstract
The invention is suitable for the technical field of communication, has provided a cable modem downstream signal anti-interference test system, method and apparatus, the system includes: the system comprises a main control device connected with a cable modem to be tested, a multi-end input power divider connected with the cable modem, wherein the multi-end input power divider is provided with a plurality of input ports and a plurality of output ports, a CMTS (Cable Modem) connected with the main control device and the multi-end input power divider, a frequency spectrograph connected with the main control device and the multi-end input power divider, a QAM (Quadrature amplitude modulation) modem connected with the main control device and the multi-end input power divider, and a noise generator connected with the main control device and the multi-end input power divider.
Description
Technical Field
The invention belongs to the technical field of automatic testing, and particularly relates to an anti-interference testing system, method and device for a cable modem downlink signal.
Background
In recent years, as network applications expand, CM (Cable Modem, Cable Modem or Cable Modem) has been developed, mainly for data transmission in Cable television networks. The CM access technology is a network access technology based on a CATV (community antenna Television system) network, the development potential of the world, especially north america, is very violent, the number of users per year is increased by more than 100%, CM access is opened in provinces such as Guangdong, Shenzhen and Nanjing in China, and the CM access technology becomes the biggest competitor of various digital subscriber line technologies of telecommunication companies.
In the CM access technology, the CM is connected in series between the cable television cable socket and the internet access device, and along with the increase of interference signals of each frequency band, the error rate of the CM demodulation downlink signal codes is increased, so that the interference resistance of the CM downlink signals is particularly important. However, at present, when testing the anti-interference of the CM downlink signal, only one-to-one test can be performed by manually operating a spectrometer, a Cable Modem Terminal System (CMTS), a QAM (Quadrature Amplitude Modulation) Modem, a noise generator, a CM, and the like, which is not efficient in testing and requires a large labor cost for testing.
Disclosure of Invention
The invention aims to provide an anti-interference test system, a method, a device, a terminal and a medium for a downstream signal of a cable modem, and aims to solve the problem of low test efficiency caused by the fact that the prior art cannot provide an effective anti-interference test system for the downstream signal of the cable modem.
In one aspect, the present invention provides an anti-interference test system for downstream signals of a cable modem, the system comprising:
the master control equipment is connected with the cable modem to be tested;
the multi-end input power divider is connected with the cable modem and is provided with a plurality of input ports and a plurality of output ports;
a CMTS connected to the master control device and the multi-port input power splitter;
the frequency spectrograph is connected with the master control equipment and the multi-end input power divider;
a QAM modem connected to the master control device and the multi-port input power divider; and
and the noise generator is connected with the master control equipment and the multi-end input power divider.
In another aspect, the present invention provides a method for testing the anti-interference capability of a downstream signal of a cable modem, comprising the following steps:
when a request of a user for testing the anti-interference capability of a downstream signal of a cable modem is received, the spectrum analyzer respectively acquires corresponding signal power output by the downstream signal of the CMTS, the interference signal of the QAM modem and the interference signal of the noise generator after passing through the multi-end input power divider;
the main control equipment respectively performs parameter configuration on the CMTS, the QAM modem and the noise generator according to the obtained corresponding signal power so that the signal power output by the downstream signal of the CMTS, the interference signal of the QAM modem and the interference signal of the noise generator after passing through the multi-end input power divider is within a preset corresponding power range;
according to the parameter configuration, the CMTS, the QAM modem and the noise generator generate corresponding test signals, first interference signals and second interference signals, the multi-end input power divider combines the test signals, the first interference signals and the second interference signals and divides the combined signals into multiple paths of same interfered test signals;
the cable modem demodulates the interfered test signal output by the multi-end input power divider;
and the master control equipment determines the anti-interference capability of the cable modem downlink signal according to the demodulation result of the interfered test signal.
In another aspect, the present invention further provides an apparatus for testing a downstream signal of a cable modem for interference rejection, where the apparatus includes:
the parameter acquisition unit is used for acquiring corresponding signal powers output by the spectrum analyzer after the downstream signal of the CMTS, the interference signal of the QAM modem and the interference signal of the noise generator pass through the multi-end input power divider respectively when a request of a user for testing the anti-interference capability of the downstream signal of the cable modem is received;
a parameter configuration unit, configured to perform parameter configuration on the CMTS, the QAM modem, and the noise generator according to the obtained corresponding signal powers, so that signal powers output by a downstream signal of the CMTS, an interference signal of the QAM modem, and an interference signal of the noise generator after passing through the multi-port input power splitter are within a preset corresponding power range;
the signal merging and splitting unit is configured to, according to the parameter configuration, generate a corresponding test signal, a first interference signal, and a second interference signal by the CMTS, the QAM modem, and the noise generator, and the multi-port input power splitter merges the test signal, the first interference signal, and the second interference signal and divides the merged signal into multiple paths of identical interfered test signals;
a signal demodulation unit, configured to demodulate, by the cable modem, the interfered test signal output by the multi-port input power divider; and
and the determining unit is used for determining the anti-interference capability of the cable modem downlink signal by the main control equipment according to the demodulation result of the interfered test signal.
The invention provides an anti-interference test system for downlink signals of a cable modem, which comprises a main control device connected with the cable modem to be tested, a multi-end input power divider connected with the cable modem, wherein the multi-end input power divider is provided with a plurality of input ports and a plurality of output ports, a CMTS (Cable Modem termination Unit) connected with the main control device and the multi-end input power divider, a frequency spectrograph connected with the main control device and the multi-end input power divider, a QAM (Quadrature amplitude modulation) modem connected with the main control device and the multi-end input power divider, and a noise generator connected with the main control device and the multi-end input power divider.
Drawings
Fig. 1 is a schematic structural diagram of an anti-interference test system for downstream signals of a cable modem according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an anti-interference test system for downstream signals of a cable modem according to an embodiment of the present invention;
fig. 3 is a flowchart of an implementation of a method for testing downstream signals of a cable modem against interference according to a second embodiment of the present invention; and
fig. 4 is a schematic structural diagram of an anti-interference testing apparatus for a cable modem downlink signal according to a third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following detailed description of specific implementations of the present invention is provided in conjunction with specific embodiments:
the first embodiment is as follows:
fig. 1 shows a structure of an anti-interference test system for cable modem downstream signals according to an embodiment of the present invention, and for convenience of description, only the parts related to the embodiment of the present invention are shown.
The embodiment of the invention provides an anti-interference test system for a downstream signal of a cable modem, which is used for testing the anti-interference of the downstream signal of a cable modem 10, and comprises a CMTS11, a QAM modem 12, a noise generator 13, a multi-end input power divider 14, a frequency spectrograph 15 and a main control device 16, wherein:
the CMTS11 is coupled to the master control device 16 and the multi-port input power splitter 14 for generating downstream signals and configuring the downstream signals to generate test signals for testing the cable modem 10, and the CMTS11 may also be used for configuring upstream signals. Specifically, in the configuration process, the CMTS11 sets the frequency point and power of the test signal and the uplink signal, keeps the frequency point and power of the uplink signal unchanged, and keeps the frequency point of the test signal unchanged. Upon receiving a request to update the disturbed test signal, the CMTS11, the QAM modem 12 and the noise generator 13 are reconfigured, i.e. the power of the test signal, the first disturbing signal and the second disturbing signal is re-adjusted, to continue the test of the cable modem 10 after updating the disturbed test signal.
The QAM modem 12 is connected to the main control device 16 and the multi-port input power divider 14, and is configured to generate a first interference signal of the test signal according to the parameter configuration of the main control device 16, and preferably, a frequency point of the first interference signal is adjacent to a frequency point of the test signal, so as to increase reliability of a test result of the test system.
The noise generator 13, the main control device 16 and the multi-port input power divider 14 are configured to generate a second interference signal of the test signal according to the parameter configuration of the main control device 16, where the second interference signal is preferably a full-band interference signal, so as to further increase the reliability of the test result of the test system.
The multi-port input power divider 14 is connected to the cable modems 10, the CMTS11, the QAM modem 12, the noise generator 13, and the spectrum analyzer 15, and is configured to divide a signal obtained by combining the test signal, the first interference signal, and the second interference signal into multiple paths of identical interfered test signals, so that the multiple cable modems 10 can perform tests simultaneously, thereby improving the test efficiency of the test system, and the multiple paths of identical interfered test signals can also be used for the spectrum analyzer 15 to obtain the frequency spectrums of the signals at the output ends of the multi-port input power divider. The multi-port input power divider 14 is provided with a plurality of signal input ports and a plurality of signal output ports, and can combine several signals into one signal, and simultaneously split the signal combined into one signal to output the same multi-channel interfered test signal.
The spectrum analyzer 15 is connected to the main control device 16 and the multi-port input power divider 14, and is configured to obtain a spectrum of a signal at an output end of the multi-port input power divider 14, that is, a spectrum of a signal output by the multi-port input power divider 14 after a downstream signal of the CMTS11, a first interference signal of the QAM modem 12, and/or a second interference signal of the noise generator 13 pass through the multi-port input power divider 14.
Specifically, in the process that the main control device 16 configures the CMTS11, the CMTS11 is turned on, and the QAM modem 12 and the noise generator 13 are kept in the off state, the spectrum analyzer 15 obtains the spectrum of the downlink signal output by the CMTS11 at the output end of the multi-port input power divider 14 to obtain the signal power at the output end of the multi-port input power divider 14, and the main control device 16 performs parameter configuration on the CMTS11 according to the signal power to make the signal power within the preset test signal power range; similarly, in the process that the main control device 16 configures the QAM modem 12, the QAM modem 12 is turned on, and the CMTS11 and the noise generator 13 are kept in the off state, the spectrum analyzer 15 obtains the spectrum of the first interference signal output by the QAM modem 12 at the output end of the multi-port input power splitter 14 to obtain the signal power at the output end of the multi-port input power splitter 14, and the main control device 16 performs parameter configuration on the QAM modem 12 according to the signal power to make the signal power within the preset first interference signal power range; similarly, in the process that the main control device 16 configures the noise generator 13, the noise generator 13 is turned on, and the CMTS11 and the QAM modem 12 are kept in the off state, the spectrum analyzer 15 obtains a spectrum of a second interference signal output by the noise generator 13 at the output end of the multi-port input power divider 14 to obtain a signal power at the output end of the multi-port input power divider 14, and the main control device 16 configures parameters of the noise generator 13 according to the signal power to make the signal power be within a preset second interference signal power range.
The main control device 16 is connected to the cable modem 10, the CMTS11, the QAM modem 12, the noise generator 13, and the spectrometer 15, and is configured to set the power of the output signal of the CMTS11, the QAM modem 12, and the noise generator 13 according to the spectrum (including the signal power) acquired by the spectrometer 15, and determine the anti-interference of the downlink signal of the cable modem 10 according to the demodulation result of the cable modem 10 demodulating the interfered test signal.
In the embodiment of the present invention, fig. 2 shows a preferred structure of the anti-interference test system for the cable modem downstream signal.
Preferably, the test system further includes an adjustable attenuator 17 connected to the CMTS11, the QAM modem 12 and the multi-port input power divider 14, and configured to attenuate a downstream signal (a test signal) and a first interference signal, and output the attenuated test signal and the attenuated first interference signal to the multi-port input power divider 14, so as to increase a power range of signals generated by the CMTS11 and the QAM modem 12, where the number of input ports of the multi-port input power divider 14 may be set to 3.
Preferably, the main control device 16 is connected to the cable modem 10, the CMTS11, the QAM modem 12, the noise generator 13, the cable modem 10, the spectrometer 15 and the adjustable attenuator 17 through an RJ45 interface or an RS232 interface, the CMTS11 and the QAM modem 12 are connected to the adjustable attenuator 17 through a cable television cable, and the CMTS11, the cable modem 10, the noise generator 13, the spectrometer 15 and the adjustable attenuator 17 are connected to the multi-port input power divider 14 through a cable television cable, so as to simplify the circuit connection of the test system. The cable is generally larger than the matching resistance of the input interface of the spectrometer, and therefore, it is further preferable that the test system further includes an impedance adapter connected to the multi-port input power divider 14 and the spectrometer 15, for converting the impedance of the cable to the impedance matched with the input interface of the spectrometer 15, thereby improving the accuracy of the acquired spectrum.
The embodiment of the invention provides an anti-interference test system for a cable modem downlink signal, the system comprises a main control device connected with a cable modem to be tested, and a multi-end input power divider connected with the cable modem, wherein the multi-end input power divider is provided with a plurality of input ports and a plurality of output ports, a CMTS connected with the main control equipment and the multi-input power divider, a frequency spectrograph connected with the main control equipment and the multi-input power divider, a QAM modem connected with the main control equipment and the multi-terminal input power divider, and a noise generator connected with the main control equipment and the multi-terminal input power divider, the main control device configures parameters of the system and controls the test system to perform anti-interference test on a plurality of cable modems after the parameters are configured, therefore, the automation degree and the testing efficiency of the testing system are improved, and the labor cost consumed by the anti-interference testing of the cable modem is further reduced.
Example two:
fig. 3 shows an implementation flow of the method for testing the anti-interference of the cable modem downstream signal according to the second embodiment of the present invention, and for convenience of description, only the relevant parts to the second embodiment of the present invention are shown.
The embodiment of the present invention is applicable to the anti-interference test system for downlink signals of a cable modem in the first embodiment, where the system includes a CMTS, a QAM modem, a noise generator, a multi-port input power divider, a spectrum analyzer, and a main control device, and the specific implementation of the test system may refer to the description in the first embodiment, and is not described herein again.
Specifically, the method for testing the anti-interference of the downstream signal of the cable modem provided by the embodiment of the invention comprises the following steps:
in step S301, when a request for testing the anti-interference capability of the downstream signal of the cable modem is received, the spectrum analyzer respectively obtains corresponding signal powers output by the downstream signal of the CMTS, the interference signal of the QAM modem, and the interference signal of the noise generator after passing through the multi-port input power splitter.
In the embodiment of the present invention, a user of the system may send a request for testing the interference rejection capability of the downstream signal of the cable modem to the main control device through an input component (e.g., a keyboard, a touch screen, etc.) of the main control device. Before the main control device performs parameter configuration on the CMTS, the QAM modem, and the noise generator, the main control device obtains corresponding signal powers output by the CMTS downstream signal, the QAM modem interference signal, and the noise generator interference signal after passing through the multi-port input power splitter, and preferably, when the corresponding signal power output by the downstream signal of the CMTS after passing through the multi-end input power divider is obtained, the QAM modem and the noise generator are kept in a closed state, when acquiring the corresponding signal power output by the QAM modem after the first interference signal passes through the multi-port input power divider, the CMTS and the noise generator are kept in a closed state, when the corresponding signal power output by the second interference signal of the noise generator after passing through the multi-terminal input power divider is obtained, the CMTS and QAM modem are kept off, thereby ensuring the accuracy of the configuration parameters.
In step S302, the main control device performs parameter configuration on the CMTS, the QAM modem, and the noise generator according to the obtained corresponding signal powers, so that the signal powers output by the downstream signal of the CMTS, the interference signal of the QAM modem, and the interference signal of the noise generator after passing through the multi-port input power splitter are within the preset corresponding power ranges.
In the embodiment of the present invention, the main control device performs parameter configuration on the CMTS, the QAM modem, and the noise generator according to the obtained corresponding signal powers, for example, sets frequency points and powers of uplink and downlink signals. Preferably, when the obtained corresponding signal power is not within the preset corresponding power range, the main control device adjusts the output signal power of the CMTS, the QAM modem, or the noise generator, so that the signal power output by the downstream signal of the CMTS, the interference signal of the QAM modem, and the interference signal of the noise generator after passing through the multi-port input power divider is within the preset corresponding power range.
In step S303, according to the parameter configuration, the CMTS, the QAM modem, and the noise generator generate a corresponding test signal, a first interference signal, and a second interference signal, and the multi-port input power splitter combines the test signal, the first interference signal, and the second interference signal, and splits the combined signal into multiple paths of identical interfered test signals.
In the embodiment of the invention, the multi-end input power divider is an improved power divider supporting multi-end signal input of the existing power divider, can combine multiple paths of signals, divide the combined signals into multiple paths of same interfered test signals to be output, and subsequently can respectively send the interfered test signals to the cable modems, so that the interference resistance of the cable modems is simultaneously tested, and the test efficiency of the test system is improved. The method comprises the steps that a QAM modem generates a first interference signal corresponding to a test signal, a noise generator generates a second interference signal corresponding to the test signal, and the test environment of the cable modem is formed by the test signal, the first interference signal and the second interference signal.
Preferably, after the test system is initialized, the master control device obtains the IP address and the MAC address of each cable modem, thereby simplifying information interaction between the master control device and each cable modem, for example, the master control device controls each cable modem to lock frequency and get online, and obtains a demodulation result of the cable modem on the interfered test signal output by the multi-port input power divider.
In step S304, the cable modem demodulates the interfered test signal output by the multi-port input power divider.
In step S305, the master control device determines the anti-interference capability of the downstream signal of the cable modem according to the demodulation result of the interfered test signal.
Preferably, the main control device acquires the number of correct codes, the number of correctable codes and the number of uncorrectable codes after the code stream of the interfered test signal is demodulated within a preset time period according to the demodulation result, the main control device judges whether the anti-interference capability of the downlink signal of the cable modem reaches the standard or not according to the number of correct codes, the number of correctable codes, the number of uncorrectable codes and a preset index formula, and judges whether the anti-interference capability of the downlink signal of the cable modem reaches the standard or not according to the ratio of the number of uncorrectable codes to the total number of the code streams of the test signal, so that whether the anti-interference capability of the downlink signal of the cable modem reaches the standard or not is judged quickly. After the cable modem demodulates the code stream of the interfered test signal, the signal code with correct demodulation is called a correct code, the signal code with demodulation errors and capable of being corrected is called a correctable code, and the signal code with demodulation errors and incapable of being corrected is called an uncorrectable code.
Further preferably, the preset index formula is
Wherein E isUIndicating the number of uncorrectable codes, ECIndicating the number of correctable codes, C number of correct codes, RCAnd representing the ratio of the number of the uncorrectable codes to the total number of the code streams, thereby quickly calculating the ratio of the number of the uncorrectable codes to the total number of the code streams of the test signal.
In the embodiment of the present invention, the antijamming capability of the downlink signal of the cable modem at different frequency points and different powers needs to be tested, so after determining whether the antijamming capability of the downlink signal of the cable modem reaches the standard at the current frequency point and power, preferably, when receiving a request for updating the interfered test signal, the method jumps to step S301 to continue testing the cable modem, thereby improving the accuracy of the test result.
In the embodiment of the invention, after receiving a request of a user for testing the anti-interference capability of a downstream signal of a cable modem, a main control device carries out parameter configuration on a test system, then according to the parameter configuration, a CMTS generates a test signal, a QAM modem generates a first interference signal, a noise generator generates a second interference signal, a multi-end input power divider combines the test signal and the interference signal and divides the combined signal into a plurality of paths of same interfered test signals, the cable modem demodulates the code stream of the interfered test signals, the main control device acquires the correct number of anti-interference codes, the number of correctable codes and the number of uncorrectable codes after demodulating the code stream of the test signal in a preset time period so as to judge whether the anti-interference capability of the downstream signal of the cable modem reaches the standard or not and realize that a plurality of cable modems carry out anti-interference tests simultaneously, therefore, the automation degree and the testing efficiency of the testing system are improved, and the labor cost consumed by the anti-interference testing of the cable modem is further reduced.
Example three:
fig. 4 shows a structure of an apparatus for anti-interference testing of downstream signals of a cable modem according to a third embodiment of the present invention, and for convenience of description, only the parts related to the third embodiment of the present invention are shown, where the structure includes:
a parameter obtaining unit 41, configured to, when receiving a request for testing an anti-interference capability of a downstream signal of a cable modem from a user, obtain, by a spectrum analyzer, corresponding signal powers output by a downstream signal of a CMTS, an interference signal of a QAM modem, and an interference signal of a noise generator after passing through a multi-port input power divider;
the parameter configuration unit 42 is configured to perform parameter configuration on the CMTS, the QAM modem, and the noise generator by the master control device according to the obtained corresponding signal powers, so that signal powers output by a downstream signal of the CMTS, an interference signal of the QAM modem, and an interference signal of the noise generator after passing through the multi-port input power splitter are within a preset corresponding power range;
the signal merging and splitting unit 43 is configured to, according to the parameter configuration, generate a corresponding test signal, a first interference signal, and a second interference signal by the CMTS, the QAM modem, and the noise generator, merge the test signal, the first interference signal, and the second interference signal by the multi-port input power splitter, and divide the merged signal into multiple paths of identical interfered test signals;
a signal demodulation unit 44, configured to demodulate, by the cable modem, the interfered test signal output by the multi-port input power divider; and
and a capability determining unit 45, configured to determine, by the master control device, an anti-interference capability of the cable modem downlink signal according to a demodulation result of the interfered test signal.
In the embodiment of the invention, after receiving a request of a user for testing the anti-interference capability of a downstream signal of a cable modem, a main control device carries out parameter configuration on a test system, then according to the parameter configuration, a CMTS generates a test signal, a QAM modem generates a first interference signal, a noise generator generates a second interference signal, a multi-end input power divider combines the test signal and the interference signal and divides the combined signal into a plurality of paths of same interfered test signals, the cable modem demodulates the code stream of the interfered test signals, the main control device acquires the correct number of anti-interference codes, the number of correctable codes and the number of uncorrectable codes after demodulating the code stream of the test signal in a preset time period so as to judge whether the anti-interference capability of the downstream signal of the cable modem reaches the standard or not and realize that a plurality of cable modems carry out anti-interference tests simultaneously, therefore, the automation degree and the testing efficiency of the testing system are improved, and the labor cost consumed by the anti-interference testing of the cable modem is further reduced.
In the embodiment of the present invention, each unit of the anti-interference testing apparatus for downstream signals of a cable modem may be implemented by a corresponding hardware or software unit, and each unit may be an independent software or hardware unit, or may be integrated into a software or hardware unit, which is not limited herein. The detailed implementation of each unit can refer to the description of the second embodiment, and is not repeated herein.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. An anti-interference test system for downstream signals of a cable modem, the system comprising:
the master control equipment is connected with the cable modem to be tested;
the multi-end input power divider is connected with the cable modem and is provided with a plurality of input ports and a plurality of output ports;
a CMTS connected to the master control device and the multi-port input power splitter;
the frequency spectrograph is connected with the master control equipment and the multi-end input power divider;
a QAM modem connected to the master control device and the multi-port input power divider; and
the noise generator is connected with the master control equipment and the multi-end input power divider;
wherein:
when a request of a user for testing the anti-interference capability of a downstream signal of a cable modem is received, the spectrum analyzer respectively acquires corresponding signal power output by the downstream signal of the CMTS, the interference signal of the QAM modem and the interference signal of the noise generator after passing through the multi-end input power divider;
the main control equipment respectively performs parameter configuration on the CMTS, the QAM modem and the noise generator according to the obtained corresponding signal power so that the signal power output by the downstream signal of the CMTS, the interference signal of the QAM modem and the interference signal of the noise generator after passing through the multi-end input power divider is within a preset corresponding power range;
according to the parameter configuration, the CMTS, the QAM modem and the noise generator generate corresponding test signals, first interference signals and second interference signals, the multi-end input power divider combines the test signals, the first interference signals and the second interference signals and divides the combined signals into multiple paths of same interfered test signals;
the cable modem demodulates the interfered test signal output by the multi-end input power divider;
and the master control equipment determines the anti-interference capability of the cable modem downlink signal according to the demodulation result of the interfered test signal.
2. The test system of claim 1, wherein the test system further comprises:
and the adjustable attenuator is connected with the CMTS, the QAM modem and the multi-terminal input power divider and used for attenuating the test signal and the first interference signal and outputting the attenuated test signal and the attenuated first interference signal to the multi-terminal input power divider.
3. The test system of claim 2, wherein the master device is connected to the cable modem, the CMTS, the noise generator, the spectrometer, the QAM modem, and the adjustable attenuator through an RJ45 interface or an RS232 interface;
the CMTS and the QAM modem are connected with the adjustable attenuator through a cable television cable, and the CMTS, the cable modem, the noise generator, the frequency spectrograph and the adjustable attenuator are connected with the multi-end input power divider through the cable television cable.
4. The test system of claim 3, wherein the test system further comprises:
and the impedance adapter is connected with the multi-end input power divider and the frequency spectrograph and is used for converting the impedance of a cable television cable between the multi-end input power divider and the frequency spectrograph to the impedance matched with the input interface of the frequency spectrograph.
5. A method for testing the anti-interference of the downstream signal of a cable modem based on the test system of any one of claims 1 to 4, said method comprising the steps of:
when a request of a user for testing the anti-interference capability of a downstream signal of a cable modem is received, the spectrum analyzer respectively acquires corresponding signal power output by the downstream signal of the CMTS, the interference signal of the QAM modem and the interference signal of the noise generator after passing through the multi-end input power divider;
the main control equipment respectively performs parameter configuration on the CMTS, the QAM modem and the noise generator according to the obtained corresponding signal power so that the signal power output by the downstream signal of the CMTS, the interference signal of the QAM modem and the interference signal of the noise generator after passing through the multi-end input power divider is within a preset corresponding power range;
according to the parameter configuration, the CMTS, the QAM modem and the noise generator generate corresponding test signals, first interference signals and second interference signals, the multi-end input power divider combines the test signals, the first interference signals and the second interference signals and divides the combined signals into multiple paths of same interfered test signals;
the cable modem demodulates the interfered test signal output by the multi-end input power divider;
and the master control equipment determines the anti-interference capability of the cable modem downlink signal according to the demodulation result of the interfered test signal.
6. The method of claim 5, wherein the step of configuring the CMTS, the QAM modem, and the noise generator with parameters according to the obtained corresponding signal powers by the master device comprises:
when the acquired corresponding signal power is not within the preset corresponding power range, the main control device adjusts the output signal power of the CMTS, the QAM modem or the noise generator.
7. The method as claimed in claim 5, wherein the step of determining, by the master device, the interference rejection capability of the cable modem downstream signal according to the demodulation result of the interfered test signal comprises:
the main control equipment acquires the number of correct codes, the number of correctable codes and the number of uncorrectable codes after the code stream of the interfered test signal is demodulated in a preset time period according to the demodulation result;
and the main control equipment judges whether the anti-interference capability of the cable modem downlink signal reaches the standard under the interfered test signal or not according to the correct code quantity, the correctable code quantity, the uncorrectable code quantity and a preset index formula.
8. The test method of claim 7, wherein the index formula is:
wherein E isUIndicating the number of uncorrectable codes, ECRepresenting the number of correctable codes, C representing the number of correct codes, RCAnd the ratio of the number of the uncorrectable codes to the total number of the code streams is represented.
9. The method for testing according to claim 5, wherein after the step of the master device determining the interference rejection capability of the cable modem downstream signal according to the demodulation result of the interfered test signal, the method further comprises:
and when a request for updating the interfered test signal is received, skipping to the step that the spectrum analyzer respectively acquires the power of the downstream signal of the CMTS, the interference signal of the QAM modem and the interference signal of the noise generator at the output end of the multi-end input power divider so as to continuously test the cable modem.
10. An apparatus for testing the downstream signal of a cable modem based on the test system of any one of claims 1-4, said apparatus comprising:
the parameter acquisition unit is used for acquiring corresponding signal powers output by the spectrum analyzer after the downstream signal of the CMTS, the interference signal of the QAM modem and the interference signal of the noise generator pass through the multi-end input power divider respectively when a request of a user for testing the anti-interference capability of the downstream signal of the cable modem is received;
a parameter configuration unit, configured to perform parameter configuration on the CMTS, the QAM modem, and the noise generator according to the obtained corresponding signal powers, so that signal powers output by a downstream signal of the CMTS, an interference signal of the QAM modem, and an interference signal of the noise generator after passing through the multi-port input power splitter are within a preset corresponding power range;
the signal merging and splitting unit is configured to, according to the parameter configuration, generate a corresponding test signal, a first interference signal, and a second interference signal by the CMTS, the QAM modem, and the noise generator, and the multi-port input power splitter merges the test signal, the first interference signal, and the second interference signal and divides the merged signal into multiple paths of identical interfered test signals;
a signal demodulation unit, configured to demodulate, by the cable modem, the interfered test signal output by the multi-port input power divider; and
and the capacity determining unit is used for determining the anti-interference capacity of the cable modem downlink signal by the main control equipment according to the demodulation result of the interfered test signal.
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