quality of service parameter

Quality of service is an important characteristic value of services. It determines the transmission quality in local networks and wide area networks and thus the quality of voice communication and data communication. Depending on the service - Internet telephony, web conferencing, streaming media, etc. - different quality of service parameters are decisive for the transmission quality. These are negotiated between the instances prior to transmission.

Quality of service parameters include data throughput and response times, delays, availabilities, priorities, and stability of services. These quality of service parameters are significantly affected by bandwidth and latency, jitter and packet loss.

In the OSI protocols of the transport layer, quality of service parameters are agreed upon when the connection is established. A list is proposed by the initializing transport instance, which is either accepted or modified by the called transport instance. Possible quality of service parameters are: Connection establishment delay, establishment failure probability, throughput, transit delay, residual error rate, transfer failure probability, decay delay, decay failure probability, transport connection protection, transport connection priority, and return from a transport connection.