Practice question

In an ITS Cabinet (Caltrans 332/ITS Cabinet v2) hosting a 2070, the role of the CMU/SIU compared to a NEMA TS2 MMU is:

  1. Identical, with the same termination program card
  2. The CMU monitors output conflict logic over a serial bus to the SIU, replacing parallel field monitoring
  3. The CMU is optional in ITS cabinets
  4. The CMU only handles ped clearance monitoring

Answer: B — The CMU monitors output conflict logic over a serial bus to the SIU, replacing parallel field monitoring

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