For instance, older USB 2. Newer, USB 3. Released in , USB 3. It offers the same 15 watts of power, but doubles the data transfer rate to 10Gbps. This was done, in part, to keep up with Apple Thunderbolt capabilities. Finally, the faster read-write speeds helps you get the most out of an external SSD. However, only USB 3. On a PC or Mac, you can find out what type of port you have through the system menu. Right out of the box, a USB 2. This is just fine, but keep in mind that this 5-meter limit is still in effect.
In other words, you can connect a 6-foot cable to a foot cable, and everything will be fine. The overall length of the cable is 16 feet. The overall length will be 20 feet, which is too long for USB 2. The longer you extend the cable, the lower the speed and the less power it will provide. For example, if you need to send a security camera feed, a foot run is probably doable, assuming minimal interference.
On the other hand, if that feed is a 4K camera with two-way audio, you might have an issue. So, you can use an extension cable to run a longer cable, but the length is limit. Is there a way to stretch that even further? However, you need to have a separate, powered device in order to boost the signal.
There are two ways of doing this. First, you could use an active extension cable, sometimes called a repeater cable. Second, you could use a powered USB hub. So, which one of these methods is going to be the most effective for your network? Active extension cables are similar to ordinary extension cables with one important difference. The provided USB cable is too short to reach the computer from where the turntable is sitting.
No problem: you just purchased a USB extension cable. But, still, nothing is working. I guess you will just have to call the Audio Solutions team for help. The Audio Solutions team will gladly help, but what we will ask is how long is the total length of USB cable you are using, including the extension and the original cable? When you tell us 20 feet we will immediately know the issue: the cable is too long.
The USB 2. So what are you going to do now? Taking 26 ns per 5 m, it comes down to m of cable. This is the maximum theoretical limit. I'd love to see if this kind of cable can be made. Personally I had a good no-error link with 40 ft 12 m cable made of Cat 5e. However, there is another functional limitation on the maximum cable length in USB: it is related to high-speed disconnect function.
The HS disconnect in USB is based on an idea that a disconnected cable would reflect the signal back, so the reflection adds up to the driven voltage leading to doubling of signal amplitude at the transmitter.
If the USB cable is disconnected at host port, no problem. But if a device with its termination is disconnected at far end of a long cable, the reflection must come back within 83 ns, the amplitude will double up, and a special comparator in the PHY receiver will register the "HS disconnect" condition.
This sets the cable limit of having Assuming 6" propagation speed per 1 ns, this requires the cable to be less than " long, or about 6. This limitation takes place only if you want to sense a clean and fast disconnect. With longer cable the host port will be eventually disabled due to protocol error, so not much problem at the end. According to USB specifications , cables longer than 5 meters would cause a too large signal propagation delay to work.
I've had no problem using any USB device over this cable. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. Maximum length of a USB Cable?
Ask Question. Asked 12 years ago. Active 9 months ago. Viewed k times. What is the maximum length of a USB cable? What is the maximum length achievable when using USB extension cables? Improve this question. Gaff Click Ok Click Ok 3, 9 9 gold badges 41 41 silver badges 43 43 bronze badges. As an alternative, there's a 10m wireless USB option. Add a comment. Active Oldest Votes. Improve this answer.
WAF 5 5 bronze badges. Just FYI, it's not really a timing issue, since using hubs doesn't mitigate the signal's propagation time. If the cable was too long, the digital logic levels might not be triggered properly at the receiving end. Each hub "resends" the signal so-to-speak, which is why this solution works.
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