Do passive USB extenders (25ft) introduce more or less latency (input delay) than an active (repeater) extenders?

spellbinder2050

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Sep 7, 2008
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I'm trying to get my hands on a 25ft USB extender cable, along with an HDMI cable, to run from my PC in my room into the living room and then attach a USB hub to it, so I can use a wireless keyboard / mouse / PS4 controller to use on my LCD screen. I plan to do gaming with keyb/mouse, but also with the game-pad.

I'm getting mixed information. The spec for USB 2.0 says that setups beyond 5 meters (approx 16 ft 5in) will not work. It also says that "repeaters" on cables greater than 5m will "regenerate the USB signal."

3 important questions about this:

1. When they say that USB is limited by 5 meters, are they talking about the power that can go through that cable or the data itself? (I don't really know how a USB cable works internally, but I'm assuming there's a data + power rail on it)

2. which aspect of what's traveling through the cable will be "regenerated" by a repeater?

3. Practically speaking, and in terms of input delay (latency), would I be better off with a 25 ft cable with or without a repeater if I plan to put a USB hub with 4 ports at the end of it?

What if I choose to only use the PS4 pad without a USB hub, which cable would be preferable?

Thanks to anyone who takes the time to read this. :)
 
Solution
The data signal is subject to attenuation and other transmission line effects that get worse over distance. A repeater takes the signal and amplifies it back to normal levels to compensate. More advanced repeaters or USB hubs will also re-time the signal to fully clean it up.

Latency-wise, USB already has horrible overhead compared to other wire protocols and you aren't hearing anybody complain about it. Adding a hub in-between won't make it noticeably worse.

InvalidError

Titan
Moderator
The data signal is subject to attenuation and other transmission line effects that get worse over distance. A repeater takes the signal and amplifies it back to normal levels to compensate. More advanced repeaters or USB hubs will also re-time the signal to fully clean it up.

Latency-wise, USB already has horrible overhead compared to other wire protocols and you aren't hearing anybody complain about it. Adding a hub in-between won't make it noticeably worse.
 
Solution