Standard head stations BDCOM are presented by models line P33XX, and the most popular during five last years as minimum, is P3310B model. This model underwent two apparatus changes already (but still it is L2 switch essentially) and today is the main "working horse" of all GEPON technology fans. Model is presented in four variants, that differ from each other by power adapter, namely:
Many of greeny-"PON specialists", ofter studying theory of PON networks building, are spoiling to locality to install cable on poles, forgetting, that it is necessary to pay attention to optical signal rates when fiber installing. That is why following phone calls are not rear in technical support service: "You sold us ONU of low quality - they are not registered at OLT". When asking "Did you measure the incoming to ONU signal?" we receive an expected answer "Why"? After such phone calls we made a decision to write the present article and to discover more practical topics in it, that concern PON networks measurement, namely: what to measure, with a help of what and how to measure?
To correctly build PON tree, it is necessary primarily to take into account, optical losses, brought by passive equipment. Theoretically, PON may cover area with radius 20 km. On practice - everything depends on losses budget on particular tree branch. It is necessary to be ruled when calculation by the worst attenuation, sensibility and radiation power rates of sensors.
To build any optical network (PON is not an exception), you must often use a range of terms that characterize physical component of the network in different ways. Main terms and their definitions are given below:
Since 2000, information technologies have been substantially changing that has expectedly resulted in large-scale implementation of Ethernet and widening the subscriber access channel to World Wide Web. This has resulted to a race of speed and service quality: at the beginning - copper networks with active repeaters on a way from the provider to the subscriber, then - almost complete shift to FOL and FTTX (FTTC, FTTB, FTTH) technologies.