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| USB Extender |
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| Juha:
--- Quote from: Peabody on October 26, 2021, 02:44:49 pm ---Even if you could get it to work, I just wonder how much 30m of cable would cost. For USB2, maybe some kind of wireless setup would work. --- End quote --- Cost? Cat5/6 cable isnt that expensive. The chip in question should be able to handle 100m through cat5 and up to 6km with fiber. Sorry maybe if I misunderstood something. |
| wraper:
Evaluation board schematics. |
| antenna:
I have a USB cable story, because I too thought there was a hard limit to length... Neighbors down the road have a summer cabin, no internet options (other than satellite) so I decided to share my wifi with them. It is about 1200 feet. I put a router on my outside wall with a better antenna and did the same thing to an ancient USB2.0 wifi adapter for their end. We put the wifi adapter (with antenna) on a pole outside and ran the cable in the window. After being tied to the window got old, they bought 30' of cheap USB3 cable. Surprisingly, it worked through a total of about 39' of cable and the speeds from the adapter (through the woods) averaged 16Mbps. With the same length of cable using the system on the dock with line of sight over the lake, I was getting 45Mbps through that same length of USB cable. The limiting factor for me was the 2.4GHz signal with dense trees and multipath from the lake waves, 10 meters of cable was no issue at all. I would buy a cable of whatever length you need and try it before trying to invent a solution to a problem that may not exist. I bet if I took the laptop to the shed (antenna back here for the season), I could get about 60Mbps through that long USB cable. And if I can do that, I don't think 10 or 20 meters (or more) of cable will be an issue for a USB2 camera. My very first webcam had its cable extended 20 feet with speaker wire and it worked fine :) |
| Juha:
--- Quote from: antenna on October 26, 2021, 07:05:06 pm ---I have a USB cable story, because I too thought there was a hard limit to length... Neighbors down the road have a summer cabin, no internet options (other than satellite) so I decided to share my wifi with them. It is about 1200 feet. I put a router on my outside wall with a better antenna and did the same thing to an ancient USB2.0 wifi adapter for their end. We put the wifi adapter (with antenna) on a pole outside and ran the cable in the window. After being tied to the window got old, they bought 30' of cheap USB3 cable. Surprisingly, it worked through a total of about 39' of cable and the speeds from the adapter (through the woods) averaged 16Mbps. With the same length of cable using the system on the dock with line of sight over the lake, I was getting 45Mbps through that same length of USB cable. The limiting factor for me was the 2.4GHz signal with dense trees and multipath from the lake waves, 10 meters of cable was no issue at all. I would buy a cable of whatever length you need and try it before trying to invent a solution to a problem that may not exist. I bet if I took the laptop to the shed (antenna back here for the season), I could get about 60Mbps through that long USB cable. And if I can do that, I don't think 10 or 20 meters (or more) of cable will be an issue for a USB2 camera. My very first webcam had its cable extended 20 feet with speaker wire and it worked fine :) --- End quote --- --- Quote from: antenna on October 26, 2021, 07:05:06 pm ---I have a USB cable story, because I too thought there was a hard limit to length... Neighbors down the road have a summer cabin, no internet options (other than satellite) so I decided to share my wifi with them. It is about 1200 feet. I put a router on my outside wall with a better antenna and did the same thing to an ancient USB2.0 wifi adapter for their end. We put the wifi adapter (with antenna) on a pole outside and ran the cable in the window. After being tied to the window got old, they bought 30' of cheap USB3 cable. Surprisingly, it worked through a total of about 39' of cable and the speeds from the adapter (through the woods) averaged 16Mbps. With the same length of cable using the system on the dock with line of sight over the lake, I was getting 45Mbps through that same length of USB cable. The limiting factor for me was the 2.4GHz signal with dense trees and multipath from the lake waves, 10 meters of cable was no issue at all. I would buy a cable of whatever length you need and try it before trying to invent a solution to a problem that may not exist. I bet if I took the laptop to the shed (antenna back here for the season), I could get about 60Mbps through that long USB cable. And if I can do that, I don't think 10 or 20 meters (or more) of cable will be an issue for a USB2 camera. My very first webcam had its cable extended 20 feet with speaker wire and it worked fine :) --- End quote --- Great! Thank you kind strangers |
| Bassman59:
--- Quote from: antenna on October 26, 2021, 07:05:06 pm ---I have a USB cable story, because I too thought there was a hard limit to length... I bet if I took the laptop to the shed (antenna back here for the season), I could get about 60Mbps through that long USB cable. And if I can do that, I don't think 10 or 20 meters (or more) of cable will be an issue for a USB2 camera. My very first webcam had its cable extended 20 feet with speaker wire and it worked fine :) --- End quote --- USB 2.0 spec for cable length is 5 meters max. The reason for the limit has nothing to do with cable losses. It's because there's a limit based on the time to receive a reply (ACK or NAK) to a packet: if the host doesn't see the ACK in the allotted time it will assume the device is broken. It won't even enumerate. So I take your bet: a 20 m USB cable won't work. |
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