The effectiveness of a communication system depends on its ability to deliver data to the correct destination accurately and in a timely manner. A system must deliver data to the intended recipient without errors and ensure packets arrive evenly to avoid jitter which results in uneven video quality. Communication can occur through simplex, half-duplex, or full-duplex modes.

5.  The effectiveness of communication system depends upon four fundamental
characteristics:
 Delivery. The system must deliver data to the correct destination. Data must be
received by the intended device or user .
 Accuracy. The system must deliver the data accurately. Data that have been
altered in transmission and left uncorrected are unusable.
 Timeliness. The system must deliver data in a timely manner. Data delivered late
are useless.
 Jitter refers to the variation in the packet arrival time. It is the uneven delay in
the delivery of audio or video packets. an uneven quality in the video is the
result.

6. Sender Receiver
Medium
Protocol
Message
Protocol

7. Communication Modes

8. Main Frame
Medium
Message
Monitor
Simplex Mode of Communication

9. Half Duplex Mode of Communication at Time 1
Station 1 Station 2
Medium
Message at
Time1

10. Half Duplex Mode of Communication at Time 2
Station 1 Station 2
Medium
Message at
Time2

11. Duplex or Full Duplex Mode of Communication
Message Message
Station 1 Station 2
Medium