Practice question

On a NEMA TS2 cabinet, the MMU receives serial messages telling it the controller's intended channel state. This data path is referred to as:

  1. Port 1 SDLC frames from the controller BIU
  2. Serial RS-232 to the master
  3. USB-C tether
  4. RS-485 maintenance interface

Answer: A — Port 1 SDLC frames from the controller BIU

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