The effect of TCP traffic over ATM ABR is studied with the ERICA switch algorithm. ABR implements its rate-based traffic control at switches (via ER algorithms like ERICA) and at sources (via source rules, such as, Rule 6, which uses TBE parameter). TCP implements its own traffic controls via slow start window control. We study the interaction between the two mechanisms. In particular, this contribution concentrates on the effect of Transient Buffer Exposure (TBE) parameter and Source End System Rule 6 on TCP/IP connections in a Wide Area Network (WAN).

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