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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Abstract
本发明公开了一种配电网EPON系统的光接口特性测试平台，包括OLT端、至少一个ONU端和测试设备，OLT端包括网络侧接口和发送接口，ONU端包括二次设备接口和接收接口，OLT端的发送接口与ONU端的接收接口连接；测试设备包括图案发生器和光功率计；OLT端的网络侧接口连接有第一图案发生器，OLT端的发送接口连接有第一光功率计，ONU端的接收接口连接有第二光功率计。利用第一图案发送的测试信号来模拟宽带远程接入服务器发送的信号,用光功率计测得的功率可以代表测试信号经过OLT端和ONU端的接口后测试信号的传递情况，并以此判断在实际使用中各接口的性能的优劣，提高配电网EPON系统运行的安全性。
The invention discloses an optical interface characteristic testing platform of an EPON system of a distribution network, which includes an OLT end, at least one ONU end and testing equipment, the OLT end includes a network side interface and a sending interface, and the ONU end includes a secondary equipment interface and a receiving interface , the transmitting interface of the OLT end is connected with the receiving interface of the ONU end; the test equipment includes a pattern generator and an optical power meter; the network side interface of the OLT end is connected with the first pattern generator, the transmitting interface of the OLT end is connected with the first optical power meter, and the receiving interface of the ONU end The interface is connected with a second optical power meter. The test signal sent by the first pattern is used to simulate the signal sent by the broadband remote access server, and the power measured by the optical power meter can represent the transmission of the test signal after passing through the interface of the OLT end and the ONU end, and use this to judge The advantages and disadvantages of the performance of each interface in actual use can improve the security of the EPON system operation of the distribution network.
Description
技术领域technical field
本发明涉及无源光网络通信技术领域，特别是涉及一种配电网EPON系统的光接口特性测试平台及方法。The invention relates to the technical field of passive optical network communication, in particular to an optical interface characteristic testing platform and method of an EPON system of a distribution network.
背景技术Background technique
EPON是基于以太网协议的无源光网络PON技术，采用点到多点结构，利用无源光纤进行信号传输，是一种光纤接入技术。典型的EPON系统由OLT，(Optical Line Terminal，光线路终端)、ONU(Optical Network Unit，光网络单元)和ODN(Optical DistributionNetwork，光分配网络)三部分组成，系统结构如图1所示。OLT发送的信号通过ODN到达各个ONU。ONU发送的信号只会到达OLT，不会到达其余ONU。ODN在OLT和ONU之间提供光通道。EPON is a passive optical network PON technology based on the Ethernet protocol. It adopts a point-to-multipoint structure and uses passive optical fibers for signal transmission. It is a fiber access technology. A typical EPON system consists of three parts: OLT, (Optical Line Terminal, Optical Line Terminal), ONU (Optical Network Unit, Optical Network Unit) and ODN (Optical Distribution Network, Optical Distribution Network). The system structure is shown in Figure 1. The signal sent by the OLT reaches each ONU through the ODN. The signal sent by the ONU will only reach the OLT, and will not reach other ONUs. The ODN provides an optical channel between the OLT and the ONU.
近年来，EPON技术发展迅速，在配电网中应用广泛，典型应用如配电光纤到户智能小区、配电自动化、电力远程抄表等。随之应用越来越广泛，对应用EPON技术的配电网的信息传输质量的要求也越来越高。在实际应用中，OLT端的网络侧接口连接宽带远程接入服务器，发送接口连接各个ONU，OUN的发送接口下接各个电力通信设备或光口电能表等二次设备。可见，EPON系统的各个光接口，即OUN和OLT的发送端和接收端的性能的优劣会直接影响整个配电网的信息传输质量，例如影响到网络的速度、稳定性和准确性，并最终直观反映在用户体验层面上。In recent years, EPON technology has developed rapidly and is widely used in distribution networks. Typical applications include distribution fiber-to-the-home smart communities, distribution automation, and remote meter reading. As the application becomes more and more extensive, the requirements for the information transmission quality of the distribution network using EPON technology are also getting higher and higher. In practical applications, the network side interface of the OLT is connected to the broadband remote access server, the transmission interface is connected to each ONU, and the transmission interface of the OUN is connected to secondary equipment such as various power communication equipment or optical energy meters. It can be seen that the performance of each optical interface of the EPON system, that is, the performance of the transmitting end and receiving end of the OUN and OLT will directly affect the information transmission quality of the entire distribution network, such as affecting the speed, stability and accuracy of the network, and ultimately Intuitively reflected in the user experience level.
因此，如何从配电网通信需求出发，准确地对EPON系统的光接口特性进行测试，将是保证配电网EPON系统中通信设备安全、可靠运行的关键。Therefore, how to accurately test the optical interface characteristics of the EPON system based on the communication requirements of the distribution network will be the key to ensure the safe and reliable operation of communication equipment in the EPON system of the distribution network.
发明内容Contents of the invention
本发明实施例中提供了一种配电网EPON系统的光接口特性测试平台及方法，能够在EPON系统的OTL端和ONU端的光接口特性进行测试。The embodiment of the present invention provides an optical interface characteristic testing platform and method of an EPON system of a distribution network, which can test the optical interface characteristics at the OTL end and the ONU end of the EPON system.
为了解决上述技术问题，本发明实施例公开了如下技术方案：In order to solve the above technical problems, the embodiment of the present invention discloses the following technical solutions:
一种配电网EPON系统的光接口特性测试平台，其特征在于，包括OLT端、至少一个ONU端和测试设备，所述OLT端包括网络侧接口和发送接口，所述ONU端包括二次设备接口和接收接口，所述OLT端的发送接口与所述ONU端的接收接口连接；A kind of optical interface characteristic test platform of EPON system of distribution network, it is characterized in that, comprise OLT terminal, at least one ONU terminal and test equipment, described OLT terminal comprises network side interface and transmission interface, and described ONU terminal comprises secondary equipment Interface and receiving interface, the transmitting interface of described OLT end is connected with the receiving interface of described ONU end;
所述测试设备包括图案发生器和光功率计，所述OLT端的网络侧接口连接有第一图案发生器，所述OLT端的发送接口连接有第一光功率计，ONU端的接收接口连接有第二光功率计。The test equipment includes a pattern generator and an optical power meter, 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 receiving interface of the ONU end is connected with the second optical power meter. dynamometer.
优选的，在上述配电网EPON系统的光接口特性测试平台中，所述测试设备还包括误码率测试设备，所述误码率测试设备分别连接在所述ONU端的二测设备接口以及所述ONU端的接收接口处。Preferably, in the optical interface characteristic test platform of the above-mentioned distribution network EPON system, the test equipment also includes a bit error rate test equipment, and the bit error rate test equipment is respectively connected to the second test equipment interface of the ONU end and the at the receiving interface on the ONU side.
优选的，在上述配电网EPON系统的光接口特性测试平台中，所述OLT端的发送接口与所述ONU端的接收接口之间连接有分路器，所述分路器的分路比为1:2，所述分路器还与第三光功率计或光示波器连接。Preferably, in the optical interface characteristic test platform of the above-mentioned distribution network EPON system, a splitter is connected between the sending interface of the OLT end and the receiving interface of the ONU end, and the splitting ratio of the splitter is 1 :2, the splitter is also connected to the third optical power meter or optical oscilloscope.
同时，本发明还提供了一种配电网的EPON系统的光接口特性测试方法，包括以下步骤：Simultaneously, the present invention also provides a kind of optical interface characteristic testing method of the EPON system of distribution network, comprises the following steps:
采用1000BASE-PX20等级的ODN网络，采用支持连续发光的ONU；Adopt 1000BASE-PX20 level ODN network, adopt ONU that supports continuous lighting;
获取所述等级的EPON系统中OLT和ONU各自的平均标准发射功率和其中 Obtain the average standard transmit power of OLT and ONU in the EPON system of the said level and in
连接在OLT网络侧接口的第一图案发生器发送测试信号，所述第一图案发送的测试信号用来模拟宽带远程接入服务器发送的信号；The first pattern generator connected to the OLT network side interface sends a test signal, and the test signal sent by the first pattern is used to simulate the signal sent by the broadband remote access server;
利用第一光功率计检测所述OLT端的发送接口的第一发射功率P1，利用第二光功率计检测所述ONU端的接收接口的第二发射功率P2。The first optical power meter is used to detect the first transmit power P1 of the transmitting interface of the OLT end, and the second optical power meter is used to detect the second transmit power P2 of the receiving interface of the ONU end.
计算所述OLT和ONU的平均在测发射功率其中, Calculate the average transmit power under test of the OLT and ONU in,
判断所述平均在测发射功率是否同时符合所述OLT和ONU各自的平均标准发射功率和如果符合,则所述OLT和ONU各自的光接口特性良好。determine the average transmit power under test Whether it meets the respective average standard transmit power of the OLT and ONU at the same time and If so, the optical interface characteristics of the OLT and the ONU are good.
由以上技术方案可见，本发明提供的配电网EPON系统的光接口特性测试平台中，利用第一图案发送的测试信号来模拟宽带远程接入服务器发送的信号,用光功率计分别测试该测试信号在OLT端和ONU端的发送接口和接收接口处的平均发射功率，测得的功率可以代表测试信号经过OLT端和ONU端的接口后测试信号的传递情况，因此该测试平台模拟EPON系统的实际使用，通过测试平均发射功率这一指标，可以判断在实际使用中各接口的性能的优劣，从而可以根据配电网EPON系统运行的具体需求来选择适合的接口性能的OLT端和ONU端，提高配电网EPON系统运行的安全性。It can be seen from the above technical solutions that in the optical interface characteristic test platform of the distribution network EPON system provided by the present invention, the test signal sent by the first pattern is used to simulate the signal sent by the broadband remote access server, and the test signal is tested respectively with an optical power meter. The average transmission power of the signal at the sending interface and receiving interface of the OLT end and the ONU end. The measured power can represent the transmission of the test signal after the test signal passes through the interface of the OLT end and the ONU end. Therefore, the test platform simulates the actual use of the EPON system , by testing the index of average transmit power, you can judge the performance of each interface in actual use, so that you can choose the OLT end and ONU end with suitable interface performance according to the specific requirements of the EPON system operation of the distribution network, and improve The security of distribution network EPON system operation.
附图说明Description of drawings
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，对于本领域普通技术人员而言，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, In other words, other drawings can also be obtained from these drawings on the premise of not paying creative work.
图1为EPON系统结构示意图；Figure 1 is a schematic diagram of the structure of the EPON system;
图2为本发明实施例提供的一种配电网EPON系统的光接口特性测试平台的结构示意图；Fig. 2 is a schematic structural diagram of an optical interface characteristic testing platform of a distribution network EPON system provided by an embodiment of the present invention;
图3为本发明实施例提供的另一种配电网EPON系统的光接口特性测试平台的结构示意图；Fig. 3 is the structural representation of the optical interface characteristic test platform of another kind of distribution network EPON system that the embodiment of the present invention provides;
图4为本发明实施例提供的第三种配电网EPON系统的光接口特性测试平台的结构示意图。FIG. 4 is a schematic structural diagram of an optical interface characteristic testing platform of a third distribution network EPON system provided by an embodiment of the present invention.
具体实施方式detailed description
为了使本技术领域的人员更好地理解本发明中的技术方案，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described The embodiments are only some of the embodiments of the present invention, not all of them.
在实际应用中，OLT端的网络侧接口连接宽带远程接入服务器，发送接口连接各个ONU，OUN的发送接口下接各个电力通信设备或光口电能表等二次设备。本发明提供一种配电网EPON系统的光接口特性测试平台，如图2所示，包括OLT端、至少一个ONU端和测试设备，所述OLT端包括网络侧接口和发送接口，所述ONU端包括二次设备接口和接收接口，所述OLT端的发送接口与所述ONU端的接收接口连接。测试设备包括图案发生器和光功率计，OLT端的网络侧接口连接有第一图案发生器，OLT端的发送接口连接有第一光功率计，ONU端的接收接口连接有第二光功率计。测试信号经过OLT端的网络侧接口，经过OLT端的发送接口，再经过OND到达ONU端的接收端口，最终到达ONU端的二次设备接口，ONU端的二测设备接口即OUN的发送接口，下接各个电力通信设备或光口电能表，也就是说测试信号能否最终可靠地利用于电力设备或光口电能表等用户终端，上述四个接口的性能的优劣是对其有直接影响的，用光功率计分别测试该测试信号在OLT端和ONU端的发送接口和接收接口处的平均发射功率，测得的功率可以代表测试信号经过OLT端和ONU端的接口后测试信号的传递情况，通过测试平均发射功率这一指标，可以判断在实际使用中各接口的性能的优劣，提高配电网EPON系统运行的安全性。具体的测试方法如下：In practical applications, the network side interface of the OLT is connected to the broadband remote access server, the transmission interface is connected to each ONU, and the transmission interface of the OUN is connected to secondary equipment such as various power communication equipment or optical energy meters. The present invention provides a kind of optical interface characteristic test platform of distribution network EPON system, as shown in Figure 2, comprises OLT end, at least one ONU end and test equipment, described OLT end comprises network side interface and transmission interface, and described ONU The end includes a secondary device interface and a receiving interface, and the sending interface of the OLT end is connected to the receiving interface of the ONU end. The test equipment includes a pattern generator and an optical power meter. The network side interface at the OLT end is connected to the first pattern generator, the sending interface at the OLT end is connected to the first optical power meter, and the receiving interface at the ONU end is connected to 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, then passes through the OND to the receiving port of the ONU end, and finally reaches the secondary device interface of the ONU end. Equipment or optical energy meter, that is to say, whether the test signal can be reliably used in power equipment or optical energy meter and other user terminals. The performance of the above four interfaces has a direct impact on it. Test the average transmission power of the test signal at the sending interface and receiving interface of the OLT and ONU respectively. The measured power can represent the transmission of the test signal after the test signal passes through the interface of the OLT and the ONU. By testing the average transmission power This index can judge the performance of each interface in actual use, and improve the security of the EPON system operation of the distribution network. The specific test method is as follows:
在步骤S01中，采用1000BASE-PX20等级的ODN网络，采用支持连续发光状态的ONU。In step S01, a 1000BASE-PX20 level ODN network is adopted, and an ONU supporting a continuous light-emitting state is adopted.
在步骤S02中，获取所述等级的EPON系统中OLT和ONU各自的平均标准发射功率和其中这个标准是基于上述采用1000BASE-PX20等级的ODN网络时，对EPON系统的光接口特性的要求。In step S02, obtain the respective average standard transmission power of OLT and ONU in the EPON system of said level and in This standard is based on the requirements for the optical interface characteristics of the EPON system when the above-mentioned 1000BASE-PX20-level ODN network is used.
然后进入步骤S03，连接在OLT网络侧接口的第一图案发生器发送测试信号，所述第一图案发送的测试信号用来模拟宽带远程接入服务器发送的信号，利用第一光功率计检测所述OLT端的发送接口的第一发射功率P1，利用第二光功率计检测所述ONU端的接收接口的第二发射功率P2。Then enter step S03, the first pattern generator connected to the OLT network side interface sends a test signal, the test signal sent by the first pattern is used to simulate the signal sent by the broadband remote access server, and the first optical power meter is used to detect the signal The first transmission power P 1 of the transmission interface at the OLT end, and the second transmission power P 2 of the reception interface at the ONU end is detected by a second optical power meter.
在步骤S04中，计算所述OLT和ONU的平均在测发射功率其中, In step S04, calculate the average transmit power under test of the OLT and ONU in,
在步骤S05中，判断所述平均在测发射功率是否同时符合所述OLT和ONU各自的平均标准发射功率和如果符合,则所述OLT和ONU各自的光接口特性良好。In step S05, it is judged that the average transmit power under test Whether it meets the respective average standard transmit power of the OLT and ONU at the same time and If so, the optical interface characteristics of the OLT and the ONU are good.
可见，在上述的测试方法中，平均标准发射功率与EPON系统使用的网络等级是存在对应关系的，在实际测试过程中，应该注意这种对应关系，以免得出错误的接口性能判断结果。It can be seen that in the above test methods, there is a corresponding relationship between the average standard transmit power and the network level used by the EPON system. In the actual test process, this corresponding relationship should be paid attention to, so as to avoid wrong interface performance judgment results.
接口性能的优劣还能通过一些特殊参数来表征，例如利用接收机灵敏度和过载光功率来表征，如图3所示,此时的配电网EPON系统的光接口特性测试平台中，测试设备还包括误码率测试设备，所述误码率测试设备分别连接在所述ONU端的二测设备接口以及所述ONU端的接收接口处，测试的结果为测试信号经过ONU的两个接口后的当前二进制误码率，如果这个当前二进制误码率达到规定，即不超过±1％，则用测试过程中的OLT和ONU的平均在测发射功率的最大值和最小值，分别代表过载光功率和接口机灵敏度。然后判断测试得到的过载光功率和接口机灵敏度是否满足下列标准：The quality of the interface performance can also be characterized by some special parameters, such as receiver sensitivity and overload optical power, as shown in Figure 3. At this time, in the optical interface characteristic test platform of the distribution network EPON system, the test equipment Also comprise bit error rate testing equipment, described bit error rate testing equipment is respectively connected at the second measuring equipment interface of described ONU end and the receiving interface place of described ONU end, and the result of test is the current of test signal after two interfaces of ONU. Binary bit error rate, if the current binary bit error rate reaches the specified value, that is, no more than ±1%, the average transmit power of the OLT and ONU during the test is used The maximum and minimum values of , respectively represent the overload optical power and the sensitivity of the interface machine. Then judge whether the overload optical power and the sensitivity of the interface machine obtained by the test meet the following standards:
的最大值是否同时满足 Whether the maximum value of is satisfied at the same time
的最小值是否同时满足 Whether the minimum value of is satisfied at the same time
如果满足，则也能证明EPON系统的光接口性能良好。If it is satisfied, it can also prove that the performance of the optical interface of the EPON system is good.
再次，也可以采用如下方式来判断接口性能的优劣,如图4所示,在上述配电网EPON系统的光接口特性测试平台中，OLT端的发送接口与所述ONU端的接收接口之间连接有分路器，所述分路器的分路比为1:2，所述分路器还与第三光功率计或光示波器连接。测试时,首先分路器与第三光功率计连接,读出第一光功率计的发射功率P5,第三光功率计的发射功率P6，计算出此时的然后断开第三光功率计，分路器与光示波器连接，示波器读出ONU总的发送周期T1、实际发送信号的时长T2以及加入光分路器的插入损耗P2，计算得到ONU在的平均发射功率P为：Again, also can adopt the following method to judge the quality of interface performance, as shown in Figure 4, in the optical interface characteristic test platform of above-mentioned distribution network EPON system, the sending interface of OLT end and the receiving interface of described ONU end are connected There is a splitter with a splitting ratio of 1:2, and the splitter is also connected to a third optical power meter or an optical oscilloscope. During the test, first connect the splitter to the third optical power meter, read out the transmit power P5 of the first optical power meter, and the transmit power P6 of the third optical power meter, and calculate the current Then disconnect the third optical power meter, connect the splitter to the optical oscilloscope, and the oscilloscope reads out the total transmission period T1 of the ONU, the duration T2 of the actual signal transmission and the insertion loss P2 added to the optical splitter, and calculates the average value of the ONU The transmit power P is:
然后判断上述功率P是否在的标准范围内，如果在则说明EPON系统的接口性能良好。Then judge whether the above power P is in If it is within the standard range, it means that the interface performance of the EPON system is good.
以上所述仅是本发明的具体实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。The foregoing is only a specific embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, some improvements and modifications can also be made without departing from the principle of the present invention. It should be regarded as the protection scope of the present invention.
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