Mode 4 codes are entered directly into the IFF interrogator at the FU. What 4 page tab can the ICC operator enter 2 digit Mode 1 and 4 digit Mode 3 codes in 30 minute increments?

• A. Tab 52 - IFF Tables
• B. Tab 9 - System Timing
• C. Tab 73 - KAA 63 Tables
• D. Tab 11 - Alarm Control

Answer: (C)

The important idea is how Mode 4 authentication values are stored and updated on the ICC. Mode 4 relies on a short Mode 1 (2-digit) and a Mode 3 (4-digit) code pair that the system uses to generate a cryptographic response to an IFF challenge. Those codes must be loaded into a specific data table on the ICC so the cryptographic process can access them during authentication.

The correct tab is the one that contains the KAA 63 Tables, accessed under that Tab 73. This is the dedicated place for storing the KAA 63 entries, which hold the time-scheduled Mode 1 and Mode 3 values. The procedure specifies updating these codes in 30-minute increments, aligning with the validity window for the credentials so the responder and interrogator stay synchronized.

Other tabs serve different purposes: one tab holds general IFF data tables, another handles system timing, and another relates to alarms. They are not the correct repository for the Mode 1/Mode 3 values, which is why the KAA 63 Tables under that tab is the right choice.