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Semper Vaporo
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- Posts: 331
- Joined: Sat Oct 09, 2010 11:51 am
by Semper Vaporo » Sat Nov 15, 2014 2:08 pm
USB has a limit of 5 meters (16-ft.,5-in.) but you can get more than that in various ways.
Most USB cameras come with a 6-ft cable. To get to the "Drive" camera in the window in the wall next to the computer, I have it on a 6-ft USB extension cable (plug on one end, socket on the other) that is plugged into a 4-port adapter that has a 6-ft cable on it; a total of 18-ft. Also on that 4-port adapter is the "Weather" cam on its 6-ft. cable aimed at the indoor display of the outdoor weather station. (Also on that 4-port adapter is a Bluetooth mouse/keyboard dongle, and it is where I plug in a memory stick to transfer files to/from the surveillance PC, so that adapter is 'full'! And it is running off of 1 port in the PC... And, yes, I am concerned about the power usage on that one poor port!)
I don't know if that 4-port adapter could be on a 16-ft cable and then devices on additional 16-ft cables from it.
For greater distances, I have some "Active Extension Cables". These are 16-ft. long and have the usual plug on one end and a larger pod on the other end with a socket and active electronic components to drive the signal an additional 16-ft. Power for the electronics is derived from the port it is plugged into. Up to 5 of these can be connected in series to get 80-ft. according to what it says on the package (plus the length of the USB device cable and maybe an extension cable for an additional 16-ft. so a total of 96-ft.).
My "South" and "East" Webcams are on 2 cables (each) in series to get to the window on the adjacent wall. And the "North" Webcam is on 3 cables in series to get all the way round the room to the window in the opposite wall. Granted the cables are not tight against the wall nor well hidden, but run under furniture around the room to get to the cameras with the shortest cables possible without making a "tripping hazard".
I have not tried using a 4-port adapter on the end of an Active Extension Cable, so I don't know how well that might work. I also wonder if I could run one Active Extension Cable to a 4-port adapter and then run addition Active Extension Cables from it. There is a limit to just how much power one can suck out of one of the computer's USB ports to power all of this. I have one 4-port adapter (unused at present) that has two plugs on its cable... One for power and data, and one for just additional power from a 2nd computer port.
There are also 4-port adapters available that have an external power connection to not use power from the computer's port at all.
My only IP cam (West) is powered by the AC line and is hardwired to the router. I originally had it connected via WiFi and had it mounted in a window behind curtains. In the winter time (sub-zero outside), when the furnace was running it would be working fine, but within a minute or two after the furnace stopped VDV would disconnect from the camera and I would have to cycle power on the camera (the AC power, not the On/Off in VDV) to regain a connection. I put a remote AC power switch on it so I didn't have to go to it to unplug it and plug it back in. But I was having to cycle power 10 or more times per day, and often lost all video when I as not there (or not awake) to reset it. I decided it was WiFi frequency drift causing it and the router to lose the connection, and that was caused by temperature swings, so I hard wired it to the router and the problem went away.
Yes, I have seen a lot of video on TV that leaves a lot to be desired in the way of resolution. But I have found that for "MY purposes", 640x480 is adequate, so, even though some of my cameras will do much better than that (and there have been times I wish I had used a higher resolution) I have set them all to 640x480 to save disk space and CPU wear and tear.
Semper Vaporo,