Quote: Originally Posted by Layback Bear
denwilliam that is a great question. I can understand that a quality of cable in the house would matter but the length makes no sense to me. They run cable (wires) for miles to get it to your house why would a few feet more matter?
Primarily has to do with the lack of shielding on typical Cat 5, 5e and 6 wiring. Unshielded wiring is much more susceptible to noise and other interference which degrades the quality of the signal.
Officially, according to the ANSI/TIA/EIA standard for category 5e copper cable (TIA/EIA 568-5-A), the maximum length for a cable segment is 100 meters (328 feet). If longer runs are required, the use of active hardware such as a repeater, or a switch, is necessary. The specifications for 10BASE-T networking specify a 100 metre length between active devices.
 CAT5e Cable Wiring Schemes
 IEEE Std 802.3-2008, Institute of Electrical and Electronics Engineers, 2008, Table 13-1 ( IEEE 802.3 ETHERNET