6881094C31-E November 16, 2006
Theory of Operation: Encryption Module 3-43
Key variables are loaded into the encryption module through connector J701, pin 1. Depending on
the type of encryption module, up to 16 keys can be stored in the module at a time. The key can be
infinite key retention or 30-seconds key retention, depending on how the codeplug is set up.
The radio' s host processor communicates with the encryption module on the Synchronous Serial
Interface (SSI) bus. The SSI bus consists of five signal lines. A communications failure between the
host processor and the secure module will be indicated as an ERROR 09/10 message on the
display.
To troubleshoot the encryption module, refer to the flowcharts in Chapter 5 “Troubleshooting Charts.”
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