1. Delivery. The system must deliver data to the correct destination. Data must be
received by the intended device or user and only by that device or user.
2. Accuracy. The system must deliver the data accurately. Data that have been
altered in transmission and left uncorrected are unusable.
3. Timeliness. The system must deliver data in a timely manner. Data delivered late are
useless. In the case of video and audio, timely delivery means delivering data as
they are produced, in the same order that they are produced, and without significant
delay. This kind of delivery is called real-time transmission.
4. Jitter. Jitter refers to the variation in the packet arrival time. It is the uneven delay in
the delivery of audio or video packets. For example, let us assume that video packets
are sent every 30 ms. If some of the packets arrive with 30-ms delay and others with
40-ms delay, an uneven quality in the video is the result.