How long usb extension

As the data transfer rate goes up, the USB host has less time to transmit its data packets and receive a response. USB cable length limit. USB 3. USB 1. To get the benefit of the faster full-duplex communication, both host and connected devices must be USB 3.

Another factor that limits USB max length is the conductivity of copper itself. As a signal travels down a copper wire, it loses some of its strength. The amount of signal loss, referred to as attenuation, is measured in decibels dB per foot or meter. The further a signal has to travel, the greater the signal loss until it reaches the point where the receiver is unable to detect or understand the signal.

Signal degradation can be reduced by using a well-insulated, larger gauge USB cable. Copper cabling is also susceptible to noise. For example, running cable too close to light fixtures or electrical power lines can introduce noise into the signal, which affects the quality of the signal rather than its strength.

Communication protocols like USB include strategies for mitigating the effects of signal distortion. This comes with a caveat. The USB hub must be powered. Just like active extension cables, USB hubs come with some limitations. First off, the overall maximum length is the same.

With a non-powered initial cable, the overall maximum length of a USB 2. Similarly, USB 3. The same rule also applies for initial cable length. Subsequent cables in the series can be shorter, but not longer than the original. The USB standard only allows you to connect 7 tiers of device. Counting the devices on both ends, this means that you can use a maximum of 5 hubs in-between.

So, what if you need to run a USB connection longer than 30 meters? Are you out of luck? Not quite. This method, called USB over Ethernet, is just what it sounds like. You convert the USB signal to an Ethernet signal, then convert it back again at the other end.

In theory, you could go further by using an Ethernet signal booster. Known as the "Tech Guru", he's an expert of current and trending technology. Here at NerdTechy, he makes tech easy to understand for the average person.

Active Extension Cables Active extension cables are similar to ordinary extension cables with one important difference. Was this helpful? Please consider sharing:. Related Posts. In Depth Review of the autowit SuperCap 2 ….

Leave a Reply Cancel reply. The problems from capacitance and inductance are - if you look closely - exactly the timing issue; The signal is spread in time direction. But even the latency can be relevant inside the link protocol; It get's much easier if you can use a full round trip for each byte you transfer - no need to keep track what may need repeating on a glitch.

And the latency over five hubs is just the same for the device to computer link ; — Volker Siegel. Those 5 hubs connected in series, do they need to have an external power supply? If you know the hubs power consumption and the end devices power need, you can calculate whether your mA from the source will be enough.

Over longer stretches the village drop might be enough to need at least some posted hubs in the sequence. What is a "low speed device" and how do i check if my one belongs into those? Show 1 more comment. There are three factors: Physical signal integrity over a twisted-pair differential for a realistically manufacturable cables impedance matching, cable uniformity, signal loss.

A USB device is allowed to respond in bit times, which is ns. How did you check the error rate on your setup? Ali Chen, thanks for this incredibly informative information post! ZAB The experiment was done between two highly polished USBB hubs, with all care about traces and connectors and termination self tuning.

There were no protocol errors, at all. The eye diagram was on the lower side of specifications, of course. But the USB3, as a full-duplex bus, doesn't have the restrictions described above, transactions can be deferred and responses in different pipes can go out-of-order, and not limited by short timeout. The working cable length is solely determined by cable quality - uniformity, cross-talk, and high-frequency losses. Chris Chris 1 1 gold badge 3 3 silver badges 9 9 bronze badges.

Others had success with 10m cables too: forum. What speed did you manage to get? I just did a test now with the aforementioned cable, and it transferred 1. I have not build a cable for USB 3. Also, the higher bandwidth will require better shielding. Sign up or log in Sign up using Google. Sign up using Facebook.

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