Cat 5 Wiring - There are two main physical differences between Cat-5 and Cat-6 cables, the number of twists per cm in the wire, and sheath thickness. Cable twisting length is not standardized, but typically there are 1.5-2 twists per cm in Cat-5(e) and 2+ twists per cm in Cat-6.. INSTALLATION KIT- Model IK Designed as an engineered system for the RTD7, CO2, SCO1, CC3, L1, L2 and T1 this complete kit can be used to easily and correctly install any type of delay box.. United Kingdom internal phone systems. Re-wiring . This guide was originally created to show users how to replace and re-wire the user side internal telephone cabling with Category5e/6 cable in an attempt to reduce interference that could hinder broadband services like xDSL. However is now updated with other tips and tricks to improve line stats further..