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2. A 3-Level Trigger System. . . . Level-1 : synchronous hardware trigger - L1 decision every 132ns, at 42 clocks (~5?s) after beam collision (1.7MHz) - L1 accept ~ 20KHz (limited by L2) ? upgrade (2005) to 30 kHz. Level-2 : mainly hardware with simple software for trigger decision - Parallel preprocessing for full detector - Average Level-2 processing time ~30 ?s - L2 accept ~350Hz (limited by EB 75MB/s) ? upgrade to 1000 Hz (EB 500 MB/s).

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