What is the difference
between Telephone and
There are two types of telephonic communication like
external telephonic communication and internal
telephonic communication. In the former
communication an employee of the organization talks
with another outside the organisational building.
In the later communication an employee talks with another within the organization. Because of this
nature of telephonic communication, it has been told that it is quickest and convenient means of external
and internal communication. There are three types of telephone connections like direct exchange line,
private branch exchange and intercom.
Intercom system of communication has become very popular in
our country. It is used to supplement private branch exchange
system and operates without an exchange. As this system is not
connected with telephone exchange, no permission is needed from
the post and telegraph department for the use of intercom service.
Multicore cables and telephone receivers are used in this system.
Push buttons are used in the receiver set. By putting the button
instant connection is obtained with any one of the circuit. If he
wants to talk a number of persons at a time he can push the
conference key available in the intercom. Today computerised
intercom system are developed.