Hi, 
  
I am new here and have very little knowledge about this.  Currently, I had 16 analog CCTV cameras in our office building that use coax cable using BNC connector.  All 16 cameras are connected to multiplexer and output to a single monitor.  There is no DVR connected. 
  
I think it is time for an upgrade.  Well, I would like to add IP CCTV cameras to our system.  Can we use the analog cameras and IP CCTV cameras together?  What equipments do I require to connect the analog cameras to the computer?  What kind of cards do I require for the PC?  I think I required about 24 IP CCTV in addition to the 16 analog CCTV and a PC as the DVR, is that possible? 
  
Any recommendation?  We are also building a wifi network at our office area (there are 4 buildings with 4 floors each).  FYI, this office is in developing countries. 
  
Thank you in advance. 
  
Ang