Jan 31, 2010 #1 G gurpreetsingh Newbie level 4 Joined Jan 29, 2010 Messages 7 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,281 Location india Activity points 1,322 hi ENGINEERS....plz tell me that What is the IDU(InDor Unit) & what is ITS use in a BTS??