IPVMU Certified | 11/05/14 01:17am
The most common approach is connecting megapixel camera(s) to a separate wifi radio, like you'd find with Ubiquiti or a similar network gear vendor. The radio itself needs to take into consideration how much bandwidth the MP (megapixel) camera will need to stream.
For example, we have a current discussion: How Many Cameras Can I Run On A Ubiquity Nanostation M5?
However, just how effective a wifi solution will be depends on a variety of factors, namely: what is the total expected bitrate of the cameras, how far is the distance, and do I have clear line-of-sight between endpoints?
Finding a MP camera with integrated (built-in) wifi is uncommon. Integrated wifi radios into cameras are typically poor performers compared to separate radios that can be designed (total needed throughput/antenna selection) for the specific application.
So: Can MP cameras be wifi networked? Absolutely yes, given the hardware behind the camera is properly sized.
If you have other questions, please ask.
I personally recommend wireless as only a last resort or in cases of extreme cost to get from point A to B for a variety of reasons that would be a much longer post. For example, dropped packets are constantly a problem in a shared medium, which low output unlicensed frequencies definitely are. Your mileage may vary and it depends heavily on the quality of equipment used, gain structure of equipment, and type/frequency of Wifi equipment used.
Also, keep in mind that it's not just line of sight that is needed over longer distances. There are fresnel zones to contend with.
20% blockage of the fresnel zone is minimal interruption but at 40% there is significant interruption. At 60% there is effectively no signal. Here is a good calculator for Fresnel zone size. Since it is in miles/kilometers the distances must be entered as decimals.
For example, a 600' distance at 2.4 GHZ has a 7' radius fresnel zone around the line of sight. At the mid point, the fresnel zone is effectively a 14' circle.
If your distance is much shorter, e.g. 300' you likely will run into much more interference before worrying about fresnel zones -- firewalls, reflective surfaces, etc. If you are going much further than that count on an even larger fesnel zone.
For complex wireless video surveillance projects you should definitely partner with an organization that is specialized in wireless networking. But I wouldn't say use wireless only as a last resort. For a simple point-to-point short run deployment, for example tranmitting to a camera in a parking lot to avoid trenching, I don't think you need to be too worried as long as you have some networking expertise. Just insure you have line-of-sight and are aware of things that can potentially cause interference. Suggest using 5 GHz which is normally less crowded than 2.4 GHz. We are not wireless experts but are involved in this type of thing all the time and rarely have issues that aren't easily resolved.
Pro Focus LLC | 11/08/14 07:10pm
There is a stark difference between using wireless cameras and using a wireless backhaul. If your client intends on simply using an existing wireless network to connect every camera for the purpose of eliminating wire, I think you will find that a poor choice.
on the other hand, if the goal is to use a wireless backhaul to connect cameras from another building or something where a wire isn't practical, then I would say that is a much easier task, given the area lends itself well to a wireless solution.
I'm very glad you brought the wireless aspect into this discussion. I had been having trouble too with wireless cameras such as an Axis M1033W. I am incorporating them into a wireless mesh network using backhaul. I can only use the 2.4 frequency which is overcrowded. Thanks to Austin, I have never heard of the "Fresnel Zone" and will be doing more research. Luckily this was experimental and not needed by a client.
IPVMU Certified | 11/10/14 04:11am
I very much appreciate all the responses I have received concerning wireless security video. I am puzzled, though. Several of the responders have used the term "backhaul". I can guess what that might mean, but in reality it's a new term for me. Could someone please provide a definition, and relate some additional information of how it is used.