Ultraviolet (UV) - do not use the cable without UV protection in direct sunlight environment.

The temperature of the cable in the metal pipe or wire slot is very high, and many polymeric materials can reduce the service life at this temperature. Water - the water in the LAN twisted pair cable will increase the capacitance of the cable, thereby reducing the impedance and causing near end crosstalk problems.

Mechanical damage (repair costs) - optical cable repair is very expensive, at least two times the need for each point of the break.

Grounding - if the shielding layer of the cable needs to be grounded, it must comply with the relevant standards.

The total length of the route (not only between the building) - the building of the use of the local area network LAN twisted pair cable, its total length should be limited to 90 meters. For the 100Mps or 1000Mbps network, its laying distance can not exceed this limit. If the laying of the distance between 100 meters to 300 meters, you should choose the cable.