This document defines a transport layer of the Serial Storage Architecture (SSA) that runs SSA-S2P and SSA-S3P while running on SSA-PH2. The goals of SSA-TL2 are to: a) provide an Extended Distance Option; b) provide support for higher data rates in the physical layer 2 (SSA-PH2);c) enhance packet formats and addressing methods; d) define a transport layer acceptable to vendors looking for an evolution from parallel SCSI and systems designers looking for opportunities to more fully exploit the capabilities inherent to a serial bus.