Tommaso Chiarusi (INFN - Sezione di Bologna)
The phase 2 of the NEMO project represents a unique occasion to test a new Trigger and Data Acquisition System (TriDAS), designed to scale up to the km3. Because of the deep sea optical background, the NEMO "all data to shore" approach requires to handle a large continuous data-stream from off-shore to on-shore, up to the last on-line computing element. The computing layers of TriDAS start after the Ethernet Floor Control Module (eFCM) electronic boards on-shore, which gate the data-stream arriving from the off-shore detector. It is arranged into 4 elements: hit managing into time-coherent aggregates, data selection according to possible concurrent trigger algorithms, composition of the selected events into a post-trigger files and finally a persistent data storage. The finalized design of TriDAS adapted for NEMO -Phase 2 is presented together with its on-line data monitoring environment and the dedicated networking architecture.