Prior to hardware design or procurement, the system
(computer, memory, and communication system) shall be analyzed to establish the
value of critical parameters needed for proper performance of the software. These
parameters are: CPU speeds, control cycle rates, interrupt rates and durations,
communications bandwidth/throughput, Random Access Memory (RAM), and Erasable
Programmable Read-Only Memory (PROM and EPROM).
At hardware selection time, each critical parameter
of the hardware shall have a minimum capability of 400% of the Current Best
At PDR, each critical parameter shall have a
minimum capability of 200% the Current Best Estimate.
At launch each parameter shall have a minimum
capability of 15% of the Current measured value.
Contractor shall provide rationale and recovery
options for significant deviations from the margin requirements.