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Broadband networks have the raw speed to achieve large data transfers that appear instantaneous to users (i.e. that take less than a second). To realize such speeds in practice requires new protocols. BTOP (Bulk Transfer Oriented Protocol) is such a protocol, designed to be simple and efficient. Not only is BTOP intended to run directly within the AAL-5 layer, BTOP is inspired by the simplicity of AAL-5. AAL-5 was developed in reaction to the perceived complexity of AAL-3 and AAL-4. BTOP's simplicity derives from it only performing those functions that the ATM layer and AAL-5 common part sublayer do not. This paper gives an overview of BTOP and addresses the issues in designing a protocol to specifically exploit the capabilities of ATM.

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