On Source Rules for ABR Service on ATM Networks with Satellite Links

During the design of ABR tra c management at the ATM Forum, we performed several analyses to ensure that the ABR service will operate e ciently over satellite links. In the cases where the performance was unacceptable, we suggested modi cations to the tra c management speci cations. This paper describes one such issue related to the count of missing resource management cells (Crm) parameter of the ABR source behavior. The analysis presented here led to the changes which are now part of the ATM tra c management (TM 4.0) speci cation. In particular, the size of the transient bu er exposure (TBE) parameter was set to 24 bits, and no size was enforced for the Crm parameter. This simple change improved the throughput over OC-3 satellite links from 45 Mbps to 140 Mbps.