CN106452574A - Optical interface characteristic test platform and method of power distribution network EPON system - Google Patents
Optical interface characteristic test platform and method of power distribution network EPON system Download PDFInfo
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- CN106452574A CN106452574A CN201610914604.6A CN201610914604A CN106452574A CN 106452574 A CN106452574 A CN 106452574A CN 201610914604 A CN201610914604 A CN 201610914604A CN 106452574 A CN106452574 A CN 106452574A
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- 238000012360 testing method Methods 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims description 9
- 230000005540 biological transmission Effects 0.000 claims abstract description 22
- 238000004891 communication Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 3
- 239000013307 optical fiber Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07955—Monitoring or measuring power
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07953—Monitoring or measuring OSNR, BER or Q
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
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Abstract
The invention discloses an optical interface characteristic test platform of a power distribution network EPON system. The platform comprises an OLT end, at least one ONU end and a test device; the OLT end includes a network-side interface and a sending interface, the ONU end comprises a secondary equipment interface and a reception interface, and the sending interface of the OLT end is connected with the reception interface of the ONU end; the test device comprises a pattern generator and optical power meters; and the network-side interface of the OLT end is connected with the first pattern generator, the sending interface of the OLT end is connected with the first optical power meter, and the reception interface of the ONU end is connected with the second optical power meter. Test signals sent by the first pattern generator are used to simulate signals sent by a broadband remote access server, power measured by the optimal power meters can represent transmission condition of the test signals after passing the interfaces of the OLT end and the ONU end, performances of the interfaces in practical use can be determined, and the operational safety of the power distribution network EPON system is improved.
Description
Technical Field
The invention relates to the technical field of passive optical network communication, in particular to a platform and a method for testing optical interface characteristics of an EPON system of a power distribution network.
Background
The EPON is a passive optical network PON technology based on an ethernet protocol, adopts a point-to-multipoint structure, utilizes passive optical fibers for signal transmission, and is an optical fiber access technology. A typical EPON system is composed of an OLT (Optical Line Terminal), an ONU (Optical Network Unit), and an ODN (Optical distribution Network), and a system structure is shown in fig. 1. The signal sent by the OLT reaches each ONU through the ODN. The signals sent by the ONUs only reach the OLT, and do not reach the rest ONUs. The ODN provides an optical channel between the OLT and the ONUs.
In recent years, the EPON technology is rapidly developed and widely applied to power distribution networks, such as intelligent residential areas with fiber to the home, power distribution automation, remote meter reading of electric power and the like. Along with the wider application, the requirement on the information transmission quality of the power distribution network applying the EPON technology is higher and higher. In practical application, a network side interface of the OLT end is connected with the broadband remote access server, the transmission interface is connected with each ONU, and the transmission interface of the OUN is connected with each secondary device such as an electric power communication device or an optical port electric energy meter. Therefore, the quality of the performance of each optical interface of the EPON system, i.e., the performance of the transmitting end and the receiving end of the OUN and the OLT, directly affects the information transmission quality of the entire power distribution network, such as the speed, stability and accuracy of the network, and is finally visually reflected on the user experience level.
Therefore, how to accurately test the optical interface characteristics of the EPON system based on the power distribution network communication requirements is a key to ensure the safe and reliable operation of communication equipment in the power distribution network EPON system.
Disclosure of Invention
The embodiment of the invention provides a platform and a method for testing optical interface characteristics of an EPON system of a power distribution network, which can test the optical interface characteristics of an OTL end and an ONU end of the EPON system.
In order to solve the technical problem, the embodiment of the invention discloses the following technical scheme:
the optical interface characteristic test platform of the distribution network EPON system is characterized by comprising an OLT (optical line terminal), at least one ONU (optical network unit) end and test equipment, wherein the OLT end comprises a network side interface and a transmitting interface, the ONU end comprises a secondary equipment interface and a receiving interface, and the transmitting interface of the OLT end is connected with the receiving interface of the ONU end;
the test equipment comprises a pattern generator and an optical power meter, wherein a network side interface of the OLT end is connected with the first pattern generator, a sending interface of the OLT end is connected with the first optical power meter, and a receiving interface of the ONU end is connected with the second optical power meter.
Preferably, in the optical interface characteristic test platform of the distribution network EPON system, the test equipment further includes error rate test equipment, and the error rate test equipment is connected to the second test equipment interface of the ONU end and the receiving interface of the ONU end, respectively.
Preferably, in the optical interface characteristic test platform of the distribution network EPON system, a splitter is connected between the transmission interface of the OLT and the reception interface of the ONU, the splitting ratio of the splitter is 1:2, and the splitter is further connected to a third optical power meter or an optical oscilloscope.
Meanwhile, the invention also provides a method for testing the optical interface characteristics of the EPON system of the power distribution network, which comprises the following steps:
adopting an ODN network with a grade of 1000BASE-PX20 and adopting ONUs supporting continuous light emission;
acquiring the average standard transmitting power of OLT and ONU in the EPON system of the gradeAndwherein
A first pattern generator connected with an OLT network side interface sends a test signal, wherein the test signal sent by the first pattern is used for simulating a signal sent by a broadband remote access server;
and detecting a first transmission power P1 of a transmission interface at the OLT end by using a first optical power meter, and detecting a second transmission power P2 of a receiving interface at the ONU end by using a second optical power meter.
Calculating the average on-test transmitting power of the OLT and the ONUWherein,
determining the average on-going transmit powerWhether to simultaneously meet the respective average standard transmitting power of the OLT and the ONUAndand if the optical interfaces are consistent, the respective optical interface characteristics of the OLT and the ONU are good.
According to the technical scheme, in the optical interface characteristic test platform of the power distribution network EPON system, the test signal sent by the first pattern is used for simulating the signal sent by the broadband remote access server, the average transmission power of the test signal at the sending interface and the receiving interface of the OLT end and the ONU end is respectively tested by the optical power meter, and the measured power can represent the transmission condition of the test signal after the test signal passes through the interfaces of the OLT end and the ONU end, so that the test platform simulates the actual use of the EPON system, the performance of each interface in the actual use can be judged by testing the index of the average transmission power, the OLT end and the ONU end with the suitable interface performance can be selected according to the specific operation requirement of the EPON system, and the operation safety of the EPON system of the power distribution network is improved.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a schematic diagram of an EPON system architecture;
fig. 2 is a schematic structural diagram of an optical interface characteristic testing platform of an EPON system of a power distribution network according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an optical interface characteristic testing platform of another power distribution network EPON system according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an optical interface characteristic test platform of an EPON system for a third power distribution network according to an embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments.
In practical application, a network side interface of the OLT end is connected with the broadband remote access server, the transmission interface is connected with each ONU, and the transmission interface of the OUN is connected with each secondary device such as an electric power communication device or an optical port electric energy meter. The invention provides an optical interface characteristic test platform of an EPON system of a power distribution network, which comprises an OLT (optical line terminal), at least one ONU (optical network unit) end and test equipment, wherein the OLT end comprises a network side interface and a transmitting interface, the ONU end comprises a secondary equipment interface and a receiving interface, and the transmitting interface of the OLT end is connected with the receiving interface of the ONU end. The test equipment comprises a pattern generator and an optical power meter, wherein a network side interface at the OLT end is connected with the first pattern generator, a sending interface at the OLT end is connected with the first optical power meter, and a receiving interface at the ONU end is connected with the second optical power meter. The test signal passes through the network side interface of the OLT end, passes through the sending interface of the OLT end, passes through the OND to reach the receiving port of the ONU end, and finally reaches the secondary equipment interface of the ONU end, the two testing equipment interfaces of the ONU end, namely the sending interface of the OUN, are connected with each electric power communication equipment or optical port electric energy meter in a downward mode, namely whether the test signal can be finally and reliably used for user terminals such as the electric power equipment or the optical port electric energy meter, the performance of the four interfaces is directly influenced, the average transmitting power of the test signal at the transmitting interface and the receiving interface of the OLT end and the ONU end is respectively tested by an optical power meter, the tested power can represent the transmission condition of the test signal after the test signal passes through the interfaces of the OLT end and the ONU end, and the average transmitting power is tested, the method can judge the performance of each interface in actual use and improve the operation safety of the EPON system of the power distribution network. The specific test method is as follows:
in step S01, an ODN network of 1000BASE-PX20 class is used, and ONUs supporting a continuous light emitting state are used.
In step S02, the average standard transmission power of the OLT and the ONU in the EPON system of the class is obtainedAndwhereinThis standard is based on the requirements for the optical interface characteristics of an EPON system when using an ODN network rated at 1000BASE-PX20 as described above.
Proceeding to step S03, the first pattern generator connected to the OLT network side interface sends a test signal, where the test signal sent by the first pattern is used to simulate a wideA first optical power meter is used for detecting the first transmitting power P of a transmitting interface at the OLT end according to a signal transmitted by a remote access server1Detecting a second transmitting power P of the receiving interface of the ONU end by using a second optical power meter2。
In step S04, an average measured transmit power of the OLT and ONU is calculatedWherein,
in step S05, the average measured transmission power is determinedWhether to simultaneously meet the respective average standard transmitting power of the OLT and the ONUAndand if the optical interfaces are consistent, the respective optical interface characteristics of the OLT and the ONU are good.
It can be seen that, in the above-mentioned testing method, there is a corresponding relationship between the average standard transmission power and the network level used by the EPON system, and in the actual testing process, this corresponding relationship should be noted so as not to obtain an erroneous interface performance judgment result.
The quality of the interface performance can also be characterized by some special parameters, for example, by using the sensitivity of the receiver and the overload optical power, as shown in fig. 3, in the optical interface characteristic test platform of the EPON system of the power distribution network at this time, the test equipment further includes error rate test equipment, the error rate test equipment is respectively connected to the binary error rate test equipment interface of the ONU end and the receiving interface of the ONU end, and the test result is the current binary error rate of the test signal after passing through the two interfaces of the ONUIf the current binary error rate reaches the specification, i.e. not more than +/-1%, the average transmitting power of the OLT and the ONU in the test process is used for measuringThe maximum and minimum values of (a) represent the overload optical power and the interface sensitivity, respectively. Then judging whether the overload optical power and the interface sensitivity obtained by the test meet the following standards:
whether or not the maximum values of (A) and (B) are simultaneously satisfied
Whether or not the minimum values of (A) are simultaneously satisfied
If satisfied, the optical interface performance of the EPON system can also be proven to be good.
Thirdly, as shown in fig. 4, in the optical interface characteristic test platform of the distribution network EPON system, a splitter is connected between the transmission interface of the OLT and the reception interface of the ONU, the splitting ratio of the splitter is 1:2, and the splitter is further connected to a third optical power meter or an optical oscilloscope. During testing, the branching unit is firstly connected with the third optical power meter, the transmitting power P5 of the first optical power meter and the transmitting power P6 of the third optical power meter are read out, and the current time is calculatedThen the third optical power meter is disconnected, the branching unit is connected with the optical oscillograph, and the oscillograph reads out the total sending period T1 and the actual sending information of the ONUThe length of time T2 of the ONU and the insertion loss P2 of the added optical splitter are calculated to obtain the average transmitting power P of the ONU as follows:
then judging whether the power P isIf so, the interface performance of the EPON system is good.
The foregoing is directed to embodiments of the present invention, and it is understood that various modifications and improvements can be made by those skilled in the art without departing from the spirit of the invention.
Claims (4)
1. The optical interface characteristic test platform of the distribution network EPON system is characterized by comprising an OLT (optical line terminal), at least one ONU (optical network unit) end and test equipment, wherein the OLT end comprises a network side interface and a transmitting interface, the ONU end comprises a secondary equipment interface and a receiving interface, and the transmitting interface of the OLT end is connected with the receiving interface of the ONU end;
the test equipment comprises a pattern generator and an optical power meter, wherein a network side interface of the OLT end is connected with the first pattern generator, a sending interface of the OLT end is connected with the first optical power meter, and a receiving interface of the ONU end is connected with the second optical power meter.
2. The platform of claim 1, wherein the testing device further comprises an error rate testing device, and the error rate testing device is connected to the second testing device interface of the ONU and the receiving interface of the ONU.
3. The platform of claim 1, wherein a splitter is connected between the transmission interface of the OLT and the reception interface of the ONU, a splitting ratio of the splitter is 1:2, and the splitter is further connected to a third optical power meter or an optical oscilloscope.
4. A method for testing the optical interface characteristics of an EPON system of a power distribution network is characterized by comprising the following steps:
adopting an ODN network with a grade of 1000BASE-PX20 and adopting ONUs supporting continuous light emission;
acquiring the average standard transmitting power of OLT and ONU in the EPON system of the gradeAndwherein
A first pattern generator connected with an OLT network side interface simultaneously sends a test signal, wherein the test signal sent by the first pattern is used for simulating a signal sent by a broadband remote access server;
detecting a first transmission power P of a transmission interface of the OLT end by using a first optical power meter1Detecting a second transmitting power P of the receiving interface of the ONU end by using a second optical power meter2；
Calculating the average on-test transmitting power of the OLT and the ONUWherein,
determining the average on-going transmit powerWhether to simultaneously meet the respective average standard transmitting power of the OLT and the ONUAndand if the optical interfaces are consistent, the respective optical interface characteristics of the OLT and the ONU are good.
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| CN111182378A (en) * | 2019-12-31 | 2020-05-19 | 瑞斯康达科技发展股份有限公司 | Registration device and method of EPON ONU |
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