I assume this is the diagram you are referring to.
This was written before the Mk2 KAT5 units were available and the receivers had to be ordered as Terminated or Unterminated.
With the Mk2 units, there is only one type of receiver AVRX which has a switchable termination. As supplied it is a terminated unit. Flick a few switches and it becomes an unterminated unit.
AVRX User guide http://www.kat5.tv/docs/avrx.pdf
AVTX User guide http://www.kat5.tv/docs/avtx.pdf
Hope that helps