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Simple "paper" models of some of the options studied in the ATLAS second level trigger
demonstrator programme are presented. The aim is to allow quick investigation of
different options and parameters to guide the computer modelling and technology studies.
This note describes paper models of architectures B and C of the ATLAS LVL2 demonstrator
programme. The architectures, protocols, parameters and assumptions of the
models are described. Physics input is taken from a selection of trigger menus for low
and high luminosity. Rates, occupancies, loads and the average latency are estimated,
and potential bottlenecks identified. The impacts of different trigger strategies on the
system requirements are studied. The effects of varying some of the parameters characterising
the hardware are shown, and critical parameters identified.
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