Practice question

On a TS2 Type 1 cabinet, what is the role of the Bus Interface Unit (BIU) in the detector rack?

  1. It rectifies AC field input to DC for the detector amplifiers
  2. It packages detector amplifier call states onto the SDLC Port 1 bus for the controller
  3. It directly switches the green field load output
  4. It synchronizes coordination offsets between adjacent intersections

Answer: B — It packages detector amplifier call states onto the SDLC Port 1 bus for the controller

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