I use the Vivotek PT7137 network camera connected through wifi/wlan to my network. Even though it is located only 7 meters from my accesspoint (with a couple of walls in between) the camera lost connection once in a while. And it wouldn’t reconnect unless I rebooted the camera. Upgrading to the latest firmware (v2.6 2009-04-14) didn’t improve either.
At the time my accesspoint was a DLINK DI-624+ broadband router and before I had time to dig into the problem any further, the DLINK passed away permanently and I got myself a Linksys WRT54GL which I pimped with Tomato. Now I had much better control over the wireless environment. I could boost the output on my Linksys to 80 mW (from the original 42) and the wireless survey helped me select a good channel with as little interference with my neighbours as possible. This helped a bit – the loss of connection occured more seldom. But they did still occur.
Finally I bought a small external antenna for the Vivotek in my local computer store. It has a 5 dB gain and a magnetic mount so I could move it around without moving the camera. This finally solved my problems and my camera haven’t lost it’s connection in months.
I still haven’t found the reason to the loss of connection. 7 meters should be no problem in a wifi/wlan environment. All other gadgets I connect through the same wireless network works without any problems. Possibly my Vivoteks wireless is broken or something in Vivoteks implementation makes it really sensetive to interference? I don’t know and honestly, I will not spend more time on it unless it causes me a problem again.