Hi all, first post here. Very green when it comes to CCTV. I've just installed 4 fixed cameras on my house eaves hooked into a DVR which holds a 1TB Sata drive. I think it's a linux based system with a basic interface. I can view the cameras on a variety of clients, browser/devices, it has all the standard stuff, alarm, motion detection, day/nigh IR, email notification, FTP upload etc... It was a relatively cheap system but it works well. Now I'm trying to get some more cameras with another DVR but this time I'd like the tilt pan type. I see that most PTZ cameras are wireless IP cameras. They need a PC running windows most of the time which is not what I want. I couldn't find any that would connect to a DVR like the one I bought. I thought you could get let's say 3 or 4 dome cameras then move them via the DVR software control. I noticed some PTZ cameras have green plugs at the back and the cables have the two extra wires to plug in. But most IP PTZ cameras I've seen don't. Just a CAT5 plug. I did a bit of reading and I must admit I'm very confused now about which ones to get. Some pointers would be much appreciated. Thanks in advance.