Abstract:This paper investigates the problems in explicit rate congestion avoidance algorithms for ABR service in ATM networks. It is found that the performance of the existing algorithms [2, 3, 4] depend on network conditions which vary dramatically in the real condition such as number of traversing sessions, traffic characteristics and propagation delay. In addition, this paper proposes a novel efficient and robust ABR congestion avoidance algorithm called "Fast Rate Allocation Congestion Avoidance (FRACA)". Some simulation results are presented to illustrate performance in terms of computation accuracy and switch buffer occupancy of the proposed algorithm. Moreover, the simulation results are compared with Explicit Rate Indication Congestion Avoidance (ERICA+) and Enhanced Fast Max-Min Rate Allocation (E-FMMRA) which are the well-known explicit rate switch algorithms and also compatible with ATM Forum Traffic Management Specification 4.0. From comparison, the proposed algorithm works better than both algorithms for all configuration scenarios.