Coaxial cable carries signals of higher frequency ranges than those in twisted pair cable, in part because the two media are constructed quite differently.
Instead of having two wires, coax has a central core conductor of solid or stranded wire enclosed in an insulating sheath, which is in turn enclosed in an outer conductor of metal foil.
The outer metallic wrapping serves both as a shield against noise and as the second conductor, which completes the circuit. This outer conductor(shield) is also enclosed in an insulating sheath, and the whole cable is protected by a plastic cover.
Instead of having two wires, coax has a central core conductor of solid or stranded wire enclosed in an insulating sheath, which is in turn enclosed in an outer conductor of metal foil.
Advantages:
- Sufficient frequency rate to support multiple channels.
- Lower error rates.
- Greater spacing between amplifier.
Disadvantages:
- More expensive to install compared to twisted pair cable.
- Thicker the cable, the more difficult to work with.