Cabling - How far can I go with a CAT 5 cable ?

Total distance between an Ethernet Transmitter and Receiver at the absolute end points of the network (maximum diameter from origin to final destination, if the wires were stretched out to form a straight line): 100 Meters (328 ft., 109 yds., or about the length of a football field). This limitation results from the timing of the Ethernet signals on the cable and not necessarily the cable characteristics.

Excluding patch cables, cross connects, etc., the maximum horizontal cable distance shall be 90 meters (295 ft.). They are referring to the run from the patch panel to the wall jack with solid core cable.