Extending USB cable with Amphenol connector
<p>
I need to connect a USB hub (see:
<a class="wikilink" href="/connecting_basler_cameras_to_usb_hub/">
connecting basler cameras to usb hub
</a>
) to a computer through a nice-looking interface that can be mounted on a panel. The first choice I found was an Amphenol connector, like
<a href="https://nl.farnell.com/amphenol/ac-usb3-aa/usb-adapter-3-0-type-a-rcpt-rcpt/dp/2951359?st=usb3%20amphenol">
this
</a>
.
</p>
<ul>
<li>
First thing to take into account: It is a female/female connector, which means that the cable that goes from the computer to the connector must be a cable without twisting pairs. It took me a while to realize why the computer was failing to connect to a
<a class="wikilink" href="/basler/">
Basler
</a>
ACE camera, thinking it was a USB2 instead of 3 connection.
</li>
<li>
Second, even if using the proper cables, there is a significant data loss. With cables of 3m, the data loss can be up to 70~80%, with cables of 1m, it can be of up to 10~20%.
</li>
</ul>
<p>
The first issue is easy to solve, the second, however is hard to understand. If I extend the cable with a male/female extension cable, I have 0% data loss, meaning that the length of the cable is not the problem, but the connector itself is.
</p>
<p>
I am testing something called a redriver (like
<a href="https://www.ti.com/tool/USB-REDRIVER-EVM?keyMatch=USB%20REDRIVER&tisearch=Search-EN-everything#descriptionArea">
this
</a>
), which seems to have solved the problems: I connect the redriver to the Amphenol and the hub to the redriver.
</p>
<p>
Even though the solution works, spending 100€ just to solve this non-crucial problem seems a bit too much.
</p>
<h2>
Problem solved
</h2>
<p>
We changed to the connectors from rs-electronics and it simply works! Either
<a href="https://nl.rs-online.com/web/p/usb-connectors/1750149/">
this
</a>
or
<a href="https://nl.rs-online.com/web/p/usb-connectors/9160224/">
this
</a>
.
</p>
<p>
Filed under:
<a class="wikilink" href="/dispertech/">
Dispertech
</a>
</p>
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