You are running Ethernet cable for a business customer in a building under construction. The cabling on the floor you’re working on is being brought down from the plenum space through a column in the center of the room as shown in the accompanying illustration (see attached
). The floor you are working on is 600 ◊ 600 feet. You know that Ethernet cable has a length limitation before you have to start using switches or repeaters. Assuming the column is the starting point, how many repeating devices will you need to sufficiently cable this floor so that all of the cubicle areas in the diagram will be able to be sufficiently wired?
Zero. If you’re starting the cabling at the center of the room, each cable length from the center should be sufficient.
Two. Cable lengths to the two areas on the right should be sufficient, but the two areas on the left are too far away.
Four. Although cable lengths seem sufficient, remember, you’ll be routing cables into numerous different individual cubicles, so the length won’t be straight end-to-end.
Eight. You’ll need two switches or repeaters in each cubicle area, since the maximum effective length of each Ethernet cable segment is only 50 metres.