![]() For avoiding collisions the TDMA protocol is used by system. Sending information upstream is more complicated, since all the users are sharing one wavelength. ![]() For safe streaming and privacy, encryption may be used, since all the ONTs get all the information. Multiplexed signal is sent to all ONTs, and packages are accepted or declined, depending on packet address header. At the input it is having one stream at N x R bps rate. It is having N outputs for N different users each output is running at R bps rate. Operation of a time-division multiplexing process. Last method is TDM (Time-Division Multiplexing) is combining voice and data streams.įigure 1. Also the amount of time-slots for user vary from many different factors, such as user priorities, the speed and quality for specific customer (guaranteed), amount of time slots requested by user, etc. Another method is DBA (Dynamic Bandwidth Allocation), which is more effective, because empty and not used time slots are reassigned to another user, who is active at this time. This method is not efficient in cases when some users don’t have information to send, which will make a signal have many empty time slots. Easiest one to do is TDMA (Time-Division Multiple Access), when every user have specified time slot and prearranged data rate. There are three main methods to solve this problem. At the same time, for all (up to 32 or 64) ONU use the same wavelength, so it needs some synchronization that will help to avoid collisions from different ONUs. OLT supposed to control user traffic and dynamically assign bandwidth to ONT (ONU).
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