CCTV Cameras And Software / Datacentre Security

Well we've decided it's about time we got around to throwing out the old black-and-white analogue CCTV system (which is based on VHS by the way, and has minimal building coverage). The idea is now to setup a new network-based system, which will record all cameras onto a server with a fair few terabytes worth of storage space.

If anyone has any ideas on the points below, please feel free to post I'm really interested if anyone on WHT has setup an ethernet CCTV network before.

Cameras

Well the main question here is: wired or wireless? For some reason, wifi cameras seem to be cheaper than wired ethernet cameras. We will be purchasing around 30 cameras in total (although the final number could be higher).

If wired, we would setup the camera's on their own LAN (possible gigabit core, and the CCTV server would then bridge to the main network).

If wireless, we could set them up on their own SSID, but it would be running alongside an important wifi network that cannot be disrupted. Would the 54mbps offered by 802.11g be sufficient for 30 (or more) cameras?

Iv'e got a feeling that i'm going overkill on the network and it wouldn't need anywhere near as much bandwidth, but we are looking for at least 10fps from each camera, anyone got any ideas?

Software

We came across an opensource CCTV management system: [url]- it has been setup on a Ubuntu machine for testing but without a CCTV camera you can only test so far . We had a D-Link DCS-900 (Rev B) but that isn't compatible with ZoneMinder (or anything else for that matter). Has any one used this software? Would you recommend a different solution (free or paid)?

Also, would be interesting to hear from anyone who has setup their own CCTV network.