Long story short, I had a burglary at one of my properties and couldn't identify the suspect because of the poor quality of the speco cameras. Its a shame because I paid a lot of money for them, but they just won't work for what I need. So I ordered a DS-7716NI-SP/16 NVR. I'm going to order some cameras soon, but need to know how I can use the existing COAX cable for the cameras. Is this possible? If so, what do I need besides the NVR and cameras? I'm assuming I will need some sort of COAX -> RJ45 converter? Will I need the converter at the NVR and another at the camera? Thanks for any help you can provide!