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5.1.4 Contact Performance Drivers - Nominal Data Rates

When the set of nominal data rates is applied to the loading analysis, the functional allocation shown in Figure 12 results.

Figure 12. Contact function and workload distribution for nominal data rates.

The numbers in parenthesis are the workloads in units of SPECint92.

For nominal Telemetry, Commanding, and GSS rates, the workstation load is relatively insignificant and all functions could be accommodated on a low-power, low-cost workstation. However, the architecture for a multi-contact mission control segment and LAN delays for time-critical commanding dictate shared front-end equipment to support standard telemetry, commanding, and encryption/decryption interfaces. Thus, the TLM Sync and CMD Transmit functions are assigned to the front end.