Numeric Evaluation of EPONs
We conducted a simulation program to demonstrate the operation of the TUR protocol with bursts of Gigabit Ethernet frames. We assumed bursts rather than single-frame transmission because IP traffic is bursty and, second, because the protocol is intended for burst transport rather than frame transport to maximize the performance. Although, of course, Ethernet frames are transported and the performance is not degraded even if we consider just pure Ethernet frames (assuming fast vertical cavity surface emitting laser [VCSEL] technology at the end users).
Figure 2-8 shows the working of the TUR protocol for four end-user nodes.