1. VLVnT09A. Belias1 The on-shore DAQ system for a deep-sea neutrino telescope A.Belias NOA-NESTOR

2. VLVnT09A. Belias2 Interlink cables MEOC FrontEndUnit Electro/Optical BaseUnit Electro/Optical JunctionBox Electro/Optical Control Center Power station Shore DAQ IN-SEAON-SHORE GRID

3. VLVnT09A. Belias3 Shore DAQ Tasks Receive all data from telescope (PMTs / Controls/ Earth & Sea-science)  ALL DATA TO SHORE Process data to extract events & calibration constants  ON-LINE SELECTION OF WHOLE TELESCOPE Archive events and operational conditions  EVENTS, RAW DATA, METADATA, DETECTOR STATUS Control and monitoring components, in-sea & on-shore  MISSION CRITICAL AND SUB-CRITICAL UNITS Update local Data Bases & export to remote facilities  VALIDITY CONTEXTS AND CACHE COHERENCE

4. VLVnT09A. Belias4 On-shore DAQ Readout Scheme ALL data are sent to shore Expected rate of 100-300Gb/s cannot be just stored Concentrate all data in temporary buffers Aggregate a time-slice of data of whole telescope Process in parallel sequences of time-slices Perform time-position correlations of photomultiplier hits Correlations in real-time for the whole telescope Data reduction factor: ~10000 Archive event data, raw data, calibration data

5. VLVnT09A. Belias5 DAQ Architecture Scheme In-sea On-shore Acquisition Node  Concentrator Data Router  Buffer S/w Trigger  Processor Optical Modules Front End Electronics Time Stamping Data Storage Data Base Control & Monitoring Clock System

6. VLVnT09A. Belias6 DAQ Architecture Option In-sea On-shore Acquisition Node  Concentrator Data Router  Buffer S/w Trigger  Processor Optical Modules Front End Electronics Time Stamping Data Storage Data Base Control & Monitoring Clock System

7. VLVnT09A. Belias7 GRID Shore Station Option A Optical Demux MEOC 80 colors 1Gbit each O/E 80 1Gbit LVDS Xilinx Virtex 6 FPGA Up to 36 11Gbit Transceivers x 5 18 lines 1Gbit Ethernet 10Gbit Switch 10Gbit Ethernet Back Bone 1 1 Gbit Ethernet 10Gbit Ethernet Data Base 10Gbit Ethernet 10Gbit Ethernet Back Bone 2 10Gbit Ethernet Computer Cluster Node 1 Node 2 Node 3 Node N Archive Run Control & Monitor Server Run Control & Monitor Server BUFFER SYSTEM

8. VLVnT09A. Belias8 GRID Shore Station Option B Optical Demux MEOC 80 colors 10Gbit each O/E 80 10Gbit LVDS Xilinx Virtex 6 FPGA Up to 36 11Gbit Transceivers x 5 18 lines 1Gbit Ethernet 10Gbit Switch 10Gbit Ethernet Back Bone 1 Gbit Ethernet Data Base 1 Gbit Ethernet Computer Cluster Node 1 Node 2 Node 3 Node N Archive Run Control & Monitor Server Run Control & Monitor Server Buffer

9. VLVnT09A. Belias9 Full Readout Chain Optical Demux Fiber O/E Xilinx ML605 Virtex 6 (36 11Gbit Tranceivers) 1Gbit Ethernet On Line Monitor 10Gbit Switch Fabric Fujitsu XG2600 26 10Gbit ports Data Buffer SUN STORAGETEK 2510 ARRAY Computer Farm 8 core processor, 64threads /core 64GB RAM 2.4TB storage Sun SPARC Enterprise T5220 Server

10. VLVnT09A. Belias10 Studies Study attainable performance of a whole readout chain. Investigate consequences of overlapping time-slices and triggers. Queue modeling for data path to determine buffer requirements.

11. VLVnT09A. Belias11 Summary Regardless of the FrontEnd Electronics of the underwater neutrino telescope, the DAQ concept on- shore has the flexibility to adapt and the modularity to scale. The use of FPGA systems allows for flexibility in hardware. The use of mass market, industrial, systems allows long term (10+ years) maintainability. Due to ease of access on-shore, active components in the sea should migrate to the on-shore DAQ system.