I just replaced an 18-year-old Pelco analog PTZ camera with a brand spanking new digital PTZ (Hanwha XNP-6320RH). Besides new cabling, here were a few odd issues I encountered:
1. The old camera had an RS-485 connection with 4 wires. The new camera had only 2 wires. I put both negatives together as one and both positives together and cabled it that way. I had to go into the camera settings webpage and tell it to use the settings of the old 485 controller (in this case Pelco-P protocol at 2400 baud), then it worked fine. Some new security installers like to remove the 485 controller and use a mouse instead. I find that approach cumbersome, and my customers do too. They were happy to have their controller working.
2. The DVR is an older Pelco Digital Sentry Version 1. When I set up the camera, it could not see video. I checked the camera webpage and it was working. After a reboot, I recalled that this system requires that the camera date and time match the recorder date and time. I went back to the camera settings webpage and synced with the viewing PC time, then told it to sync to a local time server (the DVR itself). Then the video appeared on the recorder.
3. The PTZ draws more power than a standard digital camera. When I first hooked it to a POE switch, it kept clicking but not turning on. It came with a POE injector, so I hooked it to that and it was happy. So I just hooked the switch to the passthru port on the injector and was good to go.
The visual difference between the old and new cameras is extreme. The old one was fuzzy and felt like a 1970s TV signal. The new one is crisp and detailed, and has great infrared night vision. Happy customers!