PON test plan escorts communication services
In recent years, with the rapid development of the information industry, information services and Internet applications have shown a spurt and diversified development trend, prompting the rapid expansion and upgrading of the functions and scale of broadband network infrastructure. According to the second edition of China Broadband Rate Report released by the Broadband Development Alliance, the average download rate of China's fixed broadband Internet network in the second half of 2013 reached 3.53 Mbit/s (451.84 kByte/s), compared with the first half of 2013. The average download rate and network video download rate of Chinese broadband users increased by 20.4% and 75%, respectively. On the other hand, according to the latest statistics of the Ministry of Industry and Information Technology, in January 2014, the number of fixed broadband access users of the three basic telecommunications enterprises increased by 2.264 million, an increase of 77,000 over the same period of the previous year, with a total of 191 million. The broadband access rate continued to increase. The proportion of broadband access users above 4M accounted for 79.9%, among which FTTH/O (fiber-to-the-home/office) users reached 43.137 million, and the proportion of broadband users increased to 22.6%. According to the "Informationization Development Plan" previously issued by the Ministry of Industry and Information Technology, by 2015, there will be more than 270 million fixed Internet broadband access users in China, of which more than 70 million will be installed in the fiber. The rapid development of FTTx (fiber access), in addition to the rapid growth of high-bandwidth demand business and the implementation of the "Broadband China" strategy, depends more on its own technological advantages. Due to the use of XPON (Passive Optical Network) technology, FTTx eliminates the use of amplifiers and active devices in the network, significantly reducing network equipment installation and maintenance costs while also improving network reliability. Therefore, as an ideal way for access networks, FTTx is showing a rapid development trend and is increasingly becoming the ultimate development direction of broadband access. However, the widespread use of fiber access and the consequent large-scale application of PON equipment have also made telecom enterprises put forward higher requirements for product quality and operation and maintenance costs of PON equipment. It can be said that the performance of PON equipment is good or bad. Directly related to the stability of the network and the quality of service. As a professional enterprise engaged in network construction and maintenance business, domestic communication service companies attach great importance to the construction and operation and maintenance quality of their networks. How to properly test the XPON system to ensure network performance and quickly discharge equipment failures has naturally become The focus of its attention. In response to this demand, as the main supplier of communication test equipment in China, Xintai Technology provides a complete XPON system test solution for a number of communication service companies represented by Zhejiang Communication Service and Qinghai Communication Service, for accurate and efficient verification. The tested device performance and fast location fault points provide a complete method, which provides effective support for high efficiency and low cost network operation and maintenance. The structure of the XPON system test scheme is shown in Fig. 1. The PON system is composed of a central office OLT (optical line terminal), an ODN (optical distribution network), and a user end ONU (optical network unit), and is a single-fiber bidirectional system. In the downstream direction (OLT to ONU), the signals sent by the OLT reach each ONU through the ODN; in the uplink direction (ONU to OLT), each ONU sends a signal to the OLT at a specified time. The ODN consists of passive optical components such as optical fibers and passive optical splitters, providing optical channels between the OLT and the ONU. When using the iTester network tester for XPON system testing, the OLT needs to be connected to one port of the network tester, and the remaining ONU devices are respectively connected to the remaining ports of the network tester. Figure 1 Broadband PON system test structure This test program is designed based on the relevant verification schemes of Radio and Television and the extensive practical test experience accumulated by Xintai Technology, which can be well matched to the actual test requirements of equipment manufacturers and operators. The whole solution can be divided into two parts: network basic performance test and test for PON products. Network basic performance test plan The network universal performance test complies with the RFC2544 test standard and meets the requirements of YD/T 1475-2006, YD/T 1531-2006, YD/T 1809-2008, YD/T 1771-2008 and IEEE Std 802.3-2005. Basic indicators of the network system, such as system and ONU device throughput, packet loss rate under system overload, and system forwarding delay. The structure of the network basic performance test scheme is shown in Figure 2. The system under test includes 1 OLT and 10 ONUs, and each OLT and ONU are connected to the tester. Each ONU only needs to provide one port to connect to the iTester network tester port. A 20km disk is connected between the OLT and the optical splitter. Figure 2 Structure of the network basic performance test Through this test structure, the standard RFC2544 test method can be used to test system uplink and downlink throughput, system overload packet loss rate and system forwarding delay by using standard RFC2544 test method with 64 bytes, 512 bytes, and 1518 bytes. index. If you need to test the throughput of the ONU device, you can connect a single OLT and ONU as shown in Figure 3. If each ONU provides more than one and less than or equal to 10 FE ports, connect each FE port to the data network tester. If a single ONU provides more than 10 FE ports, then optionally 10 FE ports to the data network tester. For the case where more than one GE port is provided per ONU, only one GE port is connected to the data network tester. 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