The star network topology connects computers, printers, servers and other elements at one central location called a cross-connect or hub. The buss network topology connects computers, printers, servers, and other elements in a continuous line or buss. The one advantage to this topology is that it requires no hub. But consider a situation where a printer is connected at one end of the buss and computers are at the other points. If the connection to a computer is broken, all computers on the line beyond the broken computer connection also lose their connection to the printer.
Ring topology is possible on a standard star-wired building.
The telecommunications closet should ideally be located near the center of the building. However, if more outlets are used at one end of the building, it might be more efficient to locate the telecommunications closet near that end of the building. All of the network wires throughout the building will be run to this location. It is desirable, but not necessary, that a separate electrical circuit be available to the telecommunications closet. It is usual practice to go overhead to distribute the wire.