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5 Equipment Upgrades, Software, and Communications
Pages 24-27

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From page 24...
... When upgraded to 150 Mbps, the downlink bandwidth should be adequate for sending telemetry and experimental data, but the uplink capability could be severely constrained because the signal availability of only 46-percent will affect both the downlink and the uplink communications. Significantly greater uplink bandwidth, with near continuous availability, will be necessary during the operational phase of the ISS program for the following reasons: If PIs control their experiments by teleoperation, they could attempt to control experiments while other communications are in progress, including ISS commands.
From page 25...
... The National Aeronautics and Space Administration should continue to refine the payload control/telemetry computing architecture in collaboration with the scientific community to ensure that the best technology is used and that computing devices are fully space qualified so as not to increase the workload of the crew. HOUSEKEEPING COMPUTING-HARDWARE PLATFORMS The ISS hardware architecture consists of a collection of federated processing modules on a 1553 bus.
From page 26...
... Recommendation. The National Aeronautics and Space Administration should accelerate the upgrading of the encryption to triple-DES, continue to plan aggressively for further upgrades as the technology develops, and should perform a thorough analysis of the system to identify vulnerabilities.
From page 27...
... Houston, Texas: National Aeronautics and Space Administration, Johnson Space Center. Panter, B., 1999.

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