For Link 11B operations, which ICC tab is used to initialize track block numbers?

• A. Tab 67 - BN Communications Control
• B. Tab 50 - Initialization Control
• C. Tab 69 - Extra BN Communications Control
• D. Tab 2 - BN Communications Configuration Control

Answer: (A)

In Link 11B ICC operations, track block numbers are part of the Block Number (BN) communications function. Initializing these track block numbers is a BN communications task, done through the interface that manages BN messaging and synchronization. The BN Communications Control tab is the dedicated place for handling BN-related operations, including initializing track block numbers, so it’s the correct selection.

The other tabs serve different purposes: a general Initialization Control tab handles broader system startup tasks, not the BN track block initialization; an Extra BN Communications Control tab exists for additional BN features but not specifically for the initial setup of track blocks; and a BN Communications Configuration Control tab deals with configuring BN settings rather than performing the initialization step itself.