My question is this, if you can attach up to 4 doorphones to your system, why is it only 4, if you have a 3x8 KSU shouldnt you be able to use up to 8 ? So given that, and reading the manual for a doorphone, it says to plug it in to one of the DN's of the KSU. Well if you have all 8 lines occupied by phones, does that mean you cant use the doorphone without disconnecting one of the lines, or can you twin one of the DN's.
Any help would be appreciated.