But Ethernet didn’t start with twisted pair cable ... of AT&T realized that the telephone cables already installed in offices around the world could be used for network traffic.

You either need amplifiers along the path, or need to use expensive ... solution to transmit video over long distances using twisted pair cables. The system is cheap and uses readily available ...

Twisted pair cables are available unshielded (UTP) or shielded (STP), with UTP being the most common. Shielded twisted pair (STP) is used in noisy environments and protects against electromagnetic ...