CN104836614A - Method for testing performance of CATV product - Google Patents
Method for testing performance of CATV product Download PDFInfo
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- CN104836614A CN104836614A CN201510273823.6A CN201510273823A CN104836614A CN 104836614 A CN104836614 A CN 104836614A CN 201510273823 A CN201510273823 A CN 201510273823A CN 104836614 A CN104836614 A CN 104836614A
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Abstract
The invention discloses a method for testing performance of a CATV product. The method includes the following steps: a test system is established which includes a PC control computer, a network analyzer, an optical transmitter and an optical attenuator, wherein the PC control computer is in signal connection with the network analyzer, the optical transmitter is in signal connection with the network analyzer through a 750hm radio frequency line, the optical attenuator is in signal connection with the network analyzer and a DUT (Device Under Test), and the DUT is also in direct signal connection with the network analyzer through a 750hm radio frequency line; and test software ''CATV_TEST. exe'' is installed in the PC control computer. The functions of the method for testing performance of the CATV product are that the method can be used in a performance test stage of network terminal equipment of a GPON, an EPON, an EOC and the like, truly replaces a test method in which CATV performance is judged artificially by watching TV through naked eyes, and is more reliable and efficient; and the method for testing performance of GPON, EPON, EOC products provided by the invention effectively improves test efficiency, reduces equipment investment and manpower cost, and is very suitable for popularization and use in factories.
Description
Technical field
The present invention relates to a kind of performance test methods of CATV product.
Background technology
At present, when light product and cable home gateway product are produced in the product, analog subscriber angle is all needed to check the performance of product during performance test, only lean on artificial naked eyes test and comparison loaded down with trivial details and easily judge by accident, and there is such problem: factory needs to drop into a large amount of manpower and device resource, manufacturing cost is improved greatly, and testing efficiency is also very low.
Summary of the invention
The object of the present invention is to provide a kind of performance test methods of CATV product, solve at present to the performance test methods of CATV product mainly by artificial naked eyes test, exist and easily judge by accident, accuracy rate and efficiency low, and the problem of wasting manpower and material resources.
For solving above-mentioned technical problem, the present invention by the following technical solutions:
A performance test methods for CATV product, comprises the following steps:
Step one, set up test macro, test macro comprises PC and controls computer, network analyzer, optical sender and optical attenuator, wherein said PC controls computer and is connected with network analyzer signal, described optical sender is connected with network analyzer signal by 750hm radio frequency line, described optical attenuator is connected with network analyzer and tested DUT device signal respectively, and described tested DUT equipment is also connected to network analyzer by 750hm radio frequency line direct signal;
Step 2, controls to load " CATV_TEST.exe " testing software in computer at PC;
Step 3, the network analyzer drive software controlled on computer by PC carries out optimum configurations to network analyzer;
Step 4, testing results software, feedback obtains the object information of PASS or FAIl, completes test.
Further, described " CATV_TEST.exe " testing software test parameter comprises S11 return loss and S12 insertion loss, described S11 return loss is obtained by the RF output amplifier of test light module and the characteristic of RF line in the frequency range being less than-14dBm, and described S12 insertion loss is obtained by the whole system characteristic of test light module and optical sender.
Further, be provided with a between the test section of described S12 insertion loss, b, c, d tetra-points, frequency separation is 47 ~ 1000MHz, and is provided with the S12 value of standard module at 47MHz place for x dB, then wherein
a＝(47,x+3)
b＝(47,x–3)
c＝(1000,x+3+5)
d＝(1000,x–3)
Being compared by the frequency range that configures and power bracket in the test result of network interface and network analyzer passback and software design patterns own, if there be any exceeding to show FAIL, otherwise is exactly PASS.
Network analyzer equipment should be used by " CATV_TEST.exe " testing software, achieve a butt joint the power that receives and receive the power be reflected back in way and carry out intelligent computation, to be compared result of calculation value by this software and judge equipment under test, this software finally returns PASS or FAIL.
By in tested DUT equipment access to test environment also, " CATV_TEST.exe " testing software is connected with network analyzer by netting twine, detecting real-time is to network analyzer, and the radiofrequency signal receiving the signal generator output of DUT at port one and port 2 is given to light source through RF power splitters;
The light signal that module to be measured sends carries out the test of relevant parameter (luminous power, extinction ratio, crosspoint etc.) to network analyzer.The light signal that light source sends enters overdamping device, then by optical branching device, carries out the measurement of received power to tested module receiving terminal.
The transfer process of signal:
Transmitting terminal circuit provides Automatic optical power control function and sends out No Light Alarm function.RF rf signal drives LD through coupling, filtering.At receiving terminal, circuit provides receipts No Light Alarm.By simulation receiving unit convert light signal to the signal of telecommunication, the signal of telecommunication after filtering, amplify be reduced into required radiofrequency signal.
Radiating portion the signal of telecommunication with information is converted to the conversion equipment of light signal and light signal is sent into optical fiber;
Receiving terminal changes into the faint optical signal after transmission into the signal of telecommunication, and amplify, the signal of telecommunication that shaping reverts to former input;
The algorithm used in test process:
Insertion loss (Insertion Loss): the loss referring to the bearing power occurred due to the insertion of element or device in the somewhere of legacy system, its be expressed as this element or device insert before received power with insert after power received by the same load ratio that is unit with decibel (dB).
Computing formula:
IL＝-lg(Pout/Pin)
(Pout represents Output optical power, and Pin represents input optical power, and unit is dB)
Return loss (Return Loss): when high-frequency signal transmits in electric wire and communication apparatus, when running into uneven of wave impedance, reflection will be formed to signal, this reflection not only causes the loss of signal to increase, and signal transmission deformity can be made, very large on transmission performance impact, this decay having signal reflex to cause is called as return loss.
Computing formula:
RL＝-lg(P0/P1)
(P0 represents reflected optical power, and P1 represents input optical power, and unit is dB).
Compared with prior art, the invention has the beneficial effects as follows: can carry out the use of performance test phase at network-termination devices such as GPON, EPON, EOC, by naked eyes, true replacement, manually sees that TV judges the method for testing of CATV performance, more reliably, efficiently; The performance test methods of GPON, EPON, EOC product provided by the invention, improves testing efficiency effectively, reduces equipment investment and human cost, is applicable to very much factory and promotes the use of.
Accompanying drawing explanation
Fig. 1 is the system connection diagram of the performance test methods of a kind of CATV product of the present invention.
Fig. 2 is to the schematic flow sheet calibrated after the optimum configurations of network analyzer in invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Fig. 1 shows performance test methods embodiment of a kind of CATV of the present invention product: a kind of performance test methods of CATV product, is characterized in that comprising the following steps:
Step one, set up test macro, test macro comprises PC and controls computer, network analyzer, optical sender and optical attenuator, wherein said PC controls computer and is connected with network analyzer signal, described optical sender is connected with network analyzer signal by 750hm radio frequency line, described optical attenuator is connected with network analyzer and tested DUT device signal respectively, and described tested DUT equipment is also connected to network analyzer by 750hm radio frequency line direct signal;
Step 2, controls to load " CATV_TEST.exe " testing software in computer at PC;
Step 3, the network analyzer drive software controlled on computer by PC carries out optimum configurations to network analyzer;
Step 4, testing results software, feedback obtains the object information of PASS or FAIl, completes test.
According to a preferably enforcement of the performance test methods of a kind of CATV product of the present invention, described " CATV_TEST.exe " testing software test parameter comprises S11 return loss and S12 insertion loss, described S11 return loss is obtained by the RF output amplifier of test light module and the characteristic of RF line in the frequency range being less than-14dBm, and described S12 insertion loss is obtained by the whole system characteristic of test light module and optical sender.
Preferably implement according to another of the performance test methods of a kind of CATV product of the present invention, between the test section of described S12 insertion loss, be provided with a, b, c, d tetra-points, frequency separation is 47 ~ 1000MHz, and be provided with the S12 value of standard module at 47MHz place for x dB, then wherein
a＝(47,x+3)
b＝(47,x–3)
c＝(1000,x+3+5)
d＝(1000,x–3)
Being compared by the frequency range that configures and power bracket in the test result of network interface and network analyzer passback and software design patterns own, if there be any exceeding to show FAIL, otherwise is exactly PASS.
Network analyzer equipment should be used by " CATV_TEST.exe " testing software, achieve a butt joint the power that receives and receive the power be reflected back in way and carry out intelligent computation, to be compared result of calculation value by this software and judge equipment under test, this software finally returns PASS or FAIL.
By in tested DUT equipment access to test environment also, " CATV_TEST.exe " testing software is connected with network analyzer by netting twine, detecting real-time is to network analyzer, and the radiofrequency signal receiving the signal generator output of DUT at port one and port 2 is given to light source through RF power splitters;
The light signal that module to be measured sends carries out the test of relevant parameter (luminous power, extinction ratio, crosspoint etc.) to network analyzer.The light signal that light source sends enters overdamping device, then by optical branching device, carries out the measurement of received power to tested module receiving terminal.
The transfer process of signal:
Transmitting terminal circuit provides Automatic optical power control function and sends out No Light Alarm function.RF rf signal drives LD through coupling, filtering.At receiving terminal, circuit provides receipts No Light Alarm.By simulation receiving unit convert light signal to the signal of telecommunication, the signal of telecommunication after filtering, amplify be reduced into required radiofrequency signal.
Radiating portion the signal of telecommunication with information is converted to the conversion equipment of light signal and light signal is sent into optical fiber;
Receiving terminal changes into the faint optical signal after transmission into the signal of telecommunication, and amplify, the signal of telecommunication that shaping reverts to former input;
The algorithm used in test process:
Insertion loss (Insertion Loss): the loss referring to the bearing power occurred due to the insertion of element or device in the somewhere of legacy system, its be expressed as this element or device insert before received power with insert after power received by the same load ratio that is unit with decibel (dB).
Computing formula:
IL＝-lg(Pout/Pin)
(Pout represents Output optical power, and Pin represents input optical power, and unit is dB)
Return loss (Return Loss): when high-frequency signal transmits in electric wire and communication apparatus, when running into uneven of wave impedance, reflection will be formed to signal, this reflection not only causes the loss of signal to increase, and signal transmission deformity can be made, very large on transmission performance impact, this decay having signal reflex to cause is called as return loss.
Computing formula:
RL＝-lg(P0/P1)
(P0 represents reflected optical power, and P1 represents input optical power, and unit is dB).
According to a specific embodiment of the present invention: network analyzer and arranging of optical sender can be:
A) net assign to the RF level of optical sender can not be too large, generally be set as-10dBm;
B) optical attenuator within scope-8 ~+2dBm of optical module, generally will be set to-4dBm to the luminous power of ONU
C) network analyzer be set to press recall key at network analyzer, calibration parameter file (the preservation file before calibrated) before load;
D) optical sender does not need to arrange;
E) the 1550nm power being configured such that arrival ONT of optical attenuator is about-4dBm;
F) Agilent IO Libraries Suite 15.1 drive software is installed on clean PC.
As shown in Figure 2, the setting procedure of network analyzer and optical sender:
S1: test PC holds the network interface card IP be connected with tester to be set to and tester phase same network segment; PC network card configuration is manually set: IP address is: 192.168.100.120, subnet mask: 255.255.255.0, finally preserves.
S2:PC opens Agilent IO Libraries Suite 15.1, run this software, after entering the page; PC can be connected to network analysis instrument automatically.
S3: in LAN (TCPIP0) upper interpolation network analyzer link address, choose LAN (TCPIP0) node, right button unit, select " Add Instrument ".
S4: open " Add LAN Instruments " window, the network analyzer address that here in gray area, selection has connected, clicks " OK " and complete, as are shown in figure 1.2; If do not show address at gray area, first to check whether physical circuit connects, then investigate other situation.
S5: after all setting, with regard to many facility informations under " LAN (TCPIP0) " of meeting in " Agilent Connection Export " window.
S6: open CATV_TEST.exe, the IP address (automatically obtaining) of tester, whether the setting that first checkout is relevant is correct, and click after completing " save " is preserved, and finally clicks " ok " and exits.
As outstanding choosing, used instrument and equipment can adopt following specification:
Although with reference to multiple explanatory embodiment of the present invention, invention has been described here, but, should be appreciated that, those skilled in the art can design a lot of other amendment and execution mode, these amendments and execution mode will drop within spirit disclosed in the present application and spirit.More particularly, in the scope of, accompanying drawing open in the application and claim, multiple modification and improvement can be carried out to the building block of subject combination layout and/or layout.Except the modification of carrying out building block and/or layout is with except improvement, to those skilled in the art, other purposes also will be obvious.
Claims (3)
1. a performance test methods for CATV product, is characterized in that comprising the following steps:
Step one, set up test macro, test macro comprises PC and controls computer, network analyzer, optical sender and optical attenuator, wherein said PC controls computer and is connected with network analyzer signal, described optical sender is connected with network analyzer signal by 750hm radio frequency line, described optical attenuator is connected with network analyzer and tested DUT device signal respectively, and described tested DUT equipment is also connected to network analyzer by 750hm radio frequency line direct signal;
Step 2, controls to load " CATV_TEST.exe " testing software in computer at PC;
Step 3, the network analyzer drive software controlled on computer by PC carries out optimum configurations to network analyzer;
Step 4, testing results software, feedback obtains the object information of PASS or FAIl, completes test.
2. the performance test methods of a kind of CATV product according to claim 1, it is characterized in that: described " CATV_TEST.exe " testing software test parameter comprises S11 return loss and S12 insertion loss, described S11 return loss is obtained by the RF output amplifier of test light module and the characteristic of RF line in the frequency range being less than-14dBm, and described S12 insertion loss is obtained by the whole system characteristic of test light module and optical sender.
3. the performance test methods of a kind of CATV product according to claim 2, is characterized in that: be provided with a, b between the test section of described S12 insertion loss, c, d tetra-points, frequency separation is 47 ~ 1000MHz, and be provided with the S12 value of standard module at 47MHz place for x dB, then wherein
a＝(47,x+3)
b＝(47,x–3)
c＝(1000,x+3+5)
d＝(1000,x–3)
Being compared by the frequency range that configures and power bracket in the test result of network interface and network analyzer passback and software design patterns own, if there be any exceeding to show FAIL, otherwise is exactly PASS.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105356940A (en) * | 2015-12-01 | 2016-02-24 | 上海斐讯数据通信技术有限公司 | CATV product test system and method |
| CN105703823A (en) * | 2016-03-15 | 2016-06-22 | 成都广达新网科技股份有限公司 | Output level adjusting system and adjusting method for non-feedback light AGC light receiver |
| CN106792875A (en) * | 2016-12-19 | 2017-05-31 | 上海斐讯数据通信技术有限公司 | A kind of method of testing and system of Wi Fi products emitter transmission power |
| CN111077815A (en) * | 2019-11-27 | 2020-04-28 | 成都芯通软件有限公司 | Compensation system and method for multi-band HFC (hybrid fiber coaxial) equipment with automatically tunable output level |
| CN111595558A (en) * | 2020-06-15 | 2020-08-28 | 江苏飞格光电有限公司 | Full-temperature automatic testing system and method for 5G/6G optical device |
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| CN203502201U (en) * | 2013-09-29 | 2014-03-26 | 北京太平洋莱特科技有限公司 | Automatic test device and automatic test system |
| CN203522751U (en) * | 2013-09-24 | 2014-04-02 | 杭州万隆光电设备股份有限公司 | CATV network optical receiver |
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| US20080146146A1 (en) * | 2006-01-11 | 2008-06-19 | Serconet Ltd. | Apparatus and method for frequency shifting of a wireless signal and systems using frequency shifting |
| CN203522751U (en) * | 2013-09-24 | 2014-04-02 | 杭州万隆光电设备股份有限公司 | CATV network optical receiver |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105356940A (en) * | 2015-12-01 | 2016-02-24 | 上海斐讯数据通信技术有限公司 | CATV product test system and method |
| CN105703823A (en) * | 2016-03-15 | 2016-06-22 | 成都广达新网科技股份有限公司 | Output level adjusting system and adjusting method for non-feedback light AGC light receiver |
| CN105703823B (en) * | 2016-03-15 | 2018-04-13 | 成都广达新网科技股份有限公司 | A kind of the output level adjustment system and adjusting process of feedback-less light AGC photoreceivers |
| CN106792875A (en) * | 2016-12-19 | 2017-05-31 | 上海斐讯数据通信技术有限公司 | A kind of method of testing and system of Wi Fi products emitter transmission power |
| CN111077815A (en) * | 2019-11-27 | 2020-04-28 | 成都芯通软件有限公司 | Compensation system and method for multi-band HFC (hybrid fiber coaxial) equipment with automatically tunable output level |
| CN111077815B (en) * | 2019-11-27 | 2021-08-31 | 成都芯通软件有限公司 | Compensation system and method for multi-band HFC (hybrid fiber coaxial) equipment with automatically tunable output level |
| CN111595558A (en) * | 2020-06-15 | 2020-08-28 | 江苏飞格光电有限公司 | Full-temperature automatic testing system and method for 5G/6G optical device |
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Application publication date: 20150812 |