In this expanded view of an output port we see a larger version of the three boxes from figure 4.4. From left to right we see the switch fabric, followed by a box labeled "Queuing (buffer management)," which also contains a queue of data packets. The next box is labeled "Data link processing (protocol, encapsulation)." And the last box, slightly smaller than the others, is labeled "Line termination." Blue arrows point from left to right from one box to the next.