ABSTRACT
Quality of Service (QoS) aims at providing better networking services over current technologies such as ATM, Ethernet and others. The Internet uses the best-effort model, as it provides no guarantees on when packets will be delivered. And it does not differentiate between network streams. The main three parameters for QoS are latency (delay), jitter and loss. Delay is the total amount of time a network spends to deliver a frame of data from source to destination. Jitter in turn is the delay between two consecutive packets in that frame, while loss determines the maximum amount of packets loss the stream can tolerate to provide good quality. Each parameter has been investigated thoroughly and many solutions are proposed such as forward error correction and interleaving (Kurose, 2005). Other QoS parameters include reliability, network availability and bandwidth.
