BIS: BACN IFDL (Intra-Flight Data Link) Subsystem (US Air Force)

What does BIS mean? The above is one of BIS meanings. It may have other definitions. Please refer to the end of this passage.

BIS: BACN   IFDL (Intra-Flight Data Link)  Subsystem (US Air Force)

Definition in English: BACN IFDL (Intra-Flight Data Link) Subsystem (US Air Force)