USB cable 2.0 3.0 / speed / difference?
Hi everyone.
Please give me a quick tip regarding USB cables.
It is clear that the devices can only tolerate what they are designed for – that would be a different topic.
But now:
The USB 3.0 connectors can still be identified by their color.
The question now is: are the cables themselves different from USB 2.0 and 3.0?
Does that mean that if I connect an old 2.0 cable to a modern 3.0 device, will it slow down? In the opposite case (3.0 cable and 2.0 device), it shouldn't make any difference.
I still have a lot of old cables here – in that case, I'd have to sort them out, right?
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USB to 2.x has a data line. More precisely, two that transmit the same with different polarity to detect and filter out disturbances. But there is only one data transmission on a pair of veins.
From 3.0 you have two additional pairs of veins. One can imagine how the two vein pairs use the Ethernet (up to 100 Mbit/s). Of course, you can transfer data much faster. The basic functions, that is to say that what is inserted, control power supply, etc. then works over the classic vein pair. So if you have a 3.0 (or higher) port and a 3.0 device, then everything works like a 2.0 (or lower) device until the connected device then asks the data transfer to the “new” lead pairs to switch.
The querying of the USB device then still happens like “early” over the original vein pair, the useful data is then sent via the “new” vein pairs.
P.S.:
Here is a plug for soldering yourself:
https://www.tme.eu/en/details/usba-w3.0/usb-und-ieee1394-plug-in/ninigi/?brutto=1¤cy=EUR&utm_source=google&utm_medium=cpc&utm_campaign=NIEMCY%20[PMAX]
You see the 4 “classic” pins in front, the big ones. The exteriors transmit the current, the two in the middle the data.
Behind it are 4 other small contacts that do not have a 2.0 (or smaller) plug. These are the two additional lead pairs for the rapid data transmission of the useful data.
They simply go to the “empty” when you put 2.0 in 3.0 or vice versa.
P.P.S.:
there are 5 additional contacts that are in the middle again mass, so “earth”. You don’t really need it, because for longer cables you can connect an extra shield for the “fast” vein pairs.
A 3.0 USB stick (no long cable) does not use it.
If you look at the USB3 connectors and sockets exactly, you will see more contacts, USB3 has more wires than USB2. So if only one USB2 component is included in the chain socket, cable, plug, and also only USB2 terminal.
AAgs – good advice – Thank you. I’m the first to review extensions and USB hubs. Not that I’m artificially building a bottleneck.
5 additional pins.
Yeah.
That’s it.
Only if the lower data rate is disturbed.
As a connecting cable to an external data carrier, you want to exchange it in any case.
But if only mouse and keyboard are attached at the other end, it doesn’t matter if it’s a 2.0 or 3.0 cable.