The current working assumption is, that the first layer(s) are
   based on PLD's and that the final trigger decision is done in
   a CPU (which might be in PC).

   In general, links connecting units on the detector as well as
   in the counting house will be 2-10 m, while links between
   detector and counting house will be significantly longer, say
   order 50m. Which ones are just point-to-point and or require a
   true network is one of the basic architecture questions.