QUALITY OF SERVICE (QoS) REQUIREMENTS

Done byMAHENDRA MISHRA

ECE-6A(1306005)

ARCHITECTURE OF QoS

DEFINITION

Quality of service (QoS) is the overall performance of a telephony or computer network, particularly the performance seen by the users of the network.

Quality of service is particularly important for the transport of traffic.

PARAMETERS OF QoS

APPLICATIONS A defined quality of service may be desired or required

for certain types of network traffic, for example: Streaming media specifically.

Internet protocol television (IPTV). Audio over Ethernet. Audio over IP.

IP telephony also known as Voice over IP (VoIP). Videoconferencing. Telepresence.

Application Contd.

QoS MANAGEMENT QoS management helps to set and evaluate QoS policies and

goals. A common methodology entails the following steps: Baseline the network with devices such as Remote Network

MONitoring (RMON) probes. This helps in determining the traffic characteristics of the network.

Deploy QoS techniques when the traffic characteristics have been obtained and an application(s) has been targeted for increased QoS.

Evaluate the results by testing the response of the targeted applications to see whether the QoS goals have been reached.

MANAGEMENT BLOCK DIAGRAM

LEVELS OF QoS Three basic levels of end-to-end QoS can be provided across a

heterogeneous network,The Three Levels of End-to-End QoS Are Best-Effort Service, Differentiated Service, and Guaranteed Service:

Best-effort service - Also known as lack of QoS, best-effort service is basic connectivity with no guarantees. This is best characterized by FIFO queues, which have no differentiation between flows.

Differentiated service (also called soft QoS) - Some traffic is treated better than the rest (faster handling, more average bandwidth, and lower average loss rate). This is a statistical preference, not a hard and fast guarantee. .

Guaranteed service (also called hard QoS) - This is an absolute reservation of network resources for specific traffic.

LEVELS FIGURE

QoS TABLE

QoS GRAPH

HOW CUSTOMER SATISFY ?

PARAMETERS TO SATISFY THE CUSTOMERS