Page 24 - Intelligent Communication Systems

8 INTELLIGENT COMMUNICATION SYSTEMS
To summarize, in connection-type communication, communication is com-
plete when the source receives acknowledgment, which therefore takes time. In
connectionless-type communication, on the other hand, the source only sends a
message and expects no response, which therefore takes no time. This makes it
more appropriate to use connection-type communication when the quality of the
transmission line is not so good. However, when the quality is good, it is appro-
priate to use connectionless-type communication.
The Internet protocol is TCP/IP. Transmission Control Protocol (TCP) is a
connection type of communication; Internet Protocol (IP) is a connectionless type
of communication. When both TCP and IP have connection types we can trans-
mit information from a source to its destination exactly, but it takes time. When
we have high-quality transmission lines, it is sufficient to have TCP with connec-
tion type and IP with connectionless type.
Figure 2.1 shows an example of an exchange of information between a
source and its destination. First, a request for connection is issued from the
source to the destination. When acknowledgment is received from the destination.

FIGURE 2.1 Connection-type communication.