Abstract: Tuning for connection admission control (CAC) algorithms in broadband ATM networks is accomplished using an overbooking technique based on aggregate effective bandwidth, AEBW, as an approximation to required bandwidth for given levels and classes of network traffic. An overbooking gain factor, &agr;t, is developed—typically in a network operations system—based on long-term measurements supplied periodically by network switches. This over-booking gain is derived from a count of cells arriving in periodic time slots and is updated from time to time based on measurement values sent from individual switches to the operations system. Presently disclosed embodiments provide tools that can be used for tuning call/traffic admission control and for network bandwidth management and dimensioning purposes in a variety of packet-switched networks.