Which of the following is NOT a common type of Insulated Displacement Contact (IDC) termination block?

The BXI-style block is not a commonly recognized type of Insulated Displacement Contact (IDC) termination block. In telecommunications, the most prevalent IDC termination blocks include the 66-style, 110-style, and LSA-style blocks, each designed for specific applications and offering certain advantages in wiring and connectivity.

The 66-style block is primarily used for connecting telephone wiring, while the 110-style block is recognized for its efficiency in high-speed data applications due to its lower insertion loss and better performance in a wide range of frequencies. On the other hand, the LSA-style block is often utilized in European telecommunications, noted for its reliable termination of twisted pairs.

The BXI-style designation does not correspond to a standard or widely used termination block in the industry, which is what makes this option distinct from the others, further solidifying it as the correct answer to the question.