Elephants often communicate with their trunks. When danger lurks near, one elephant will raise its trunk to alert the troops. Despite the fact that the rest of the herd might be a half-mile away, they can still understand this signal. Depending on how advanced your business is, you may need only a few of these systems, or you may need all of them. Mediums Telephone Wire.
Telephone wire is made up of one or more pairs of strands of copper wire twisted together.
These two wires connect to form the connection. As multiple lines are added to the phone, so are pairs of wires. For example, a two-line phone would have four wires. Switches are used to rotate the calls between lines. One method of transmitting information is through coaxial cable, which has the capability of transmitting signals back and forth simultaneously.