Hvor langt kan man trække et USB kabel??

Fra www.usb.org

Q2: How long of a cable can I use to connect my device?
A2: In practice, the USB specification limits the length of a cable between full speed devices to 5 meters (a little under 16 feet 5 inches). For a low speed device the limit is 3 meters (9 feet 10 inches).

Q3: Why can't I use a cable longer than 3 or 5m?
A3: USB's electrical design doesn't allow it. When USB was designed, a decision was made to handle the propagation of electromagnetic fields on USB data lines in a way that limited the maximum length of a USB cable to something in the range of 4m. This method has a number of advantages and, since USB is intended for a desktop environment, the range limitations were deemed acceptable. If you're familiar with transmission line theory and want more detail on this topic, take a look at the USB signals section of the developers FAQ.

Q4: How far away from a PC can I put a USB device?
A4: With the maximum of 5 hubs connected with 5m cables and a 5m cable going to your full speed device, this will give you 30m of cable (see section 7.1.19 for details). With a low speed device, you will be able to get a range up to 27m, depending on how long the device's cable is. With a straightforward cable route, you will probably be able to reach out 25m or so from the PC.

Q5: I need to put a USB device X distance from my PC. What do I do?
A5: If X is less than 25m or so (see previous question), buy a bunch of hubs and connect them serially with 5m cables. If you need to go farther than that, put another PC, or maybe a laptop, out where you need the device to be and network it with the first PC using something that's intended to be a long-range connection, such as Ethernet or RS-485. If you need to use nothing but USB, consider using USB based Ethernet adapters to hook the PCs together.

Snowball

Efter 10 meter begynder din båndbrede at gå ned, så brug det som et max.


Med venlig hilsen Daniel...

jeg har et med 15 meter og det fungere fint jeg vil tror at hvis du skulle købe 200 meter så vil du blive fattig

Ja, okay ifølge www.usb.org tager jeg fejl, sorry.


Med venlig hilsen Daniel...

men du kan jo nok gøre det det bliver nok bare lidt langsomt :)