Editing Grade of service (section)

==Quality of Service in broadband networks==
In broadband networks, the Quality of Service is measured using two criteria. The first criterion is the probability of packet losses or delays in already accepted calls. The second criterion refers to the probability that a new incoming call will be rejected or blocked. To avoid the former, broadband networks limit the number of active calls so that packets from established calls will not be lost due to new calls arriving. As in circuit-switched networks, the Grade of Service can be calculated for individual switches or for the whole network.<ref name="ritter">Ritter, M., Phuoc, P., Multi-Rate Models for Dimensioning and Performance Evaluation of ATM Networks, COST 242, Institute of Computer Science, University of Würzburg, June 1994</ref>