We have a Windows/UNIX Network with about 140 PCs and 16 servers with a main hub room and sub hub room. I've been making cables with RJ45 connectors for various areas using a Mohawk/CDT Megalan M56167 5E+ 4 pair 24 AWG (UL) C (UL), ETL verified to TIA/EIA 568B.2 CAT 5E cable for a couple of years. Apparently the cable cables I have made are no longer than 25 FT because I just just had a requirement for a 50 foot extension and the cable would not support a network connection. The cable tests as good. I made a second cable, same no connection. I tested the cable again, this time by plugging directly into a switch in the main computer hub room and still no connection allowed. I cut the cable down using the existing RJ45s I had installed, several feet at a time. When I got to about 25 FT the connection was good. The cable tests the same as when it was a 50 FT lenght. Is there a know problem with 5E+ cable not being able to support within the normal 324 foot cable lenght? This cable looks much like or original wiring except the outer jacket tends to cling to the inner wires whereas the building wires have that full round appearance. Could a lack of shielding be the problem?