Avatar billede bdf Mester
14. april 2002 - 21:27 Der er 9 kommentarer og
1 løsning

USB "Forstærker"

Hvis man f.eks. har et webcam til sluttet sin computer med USB-forstærker, hvor langt kan man så flytte webcamet væk fra computeren???
Kan det passe at det er 10M eller sådan noget
Avatar billede francke Nybegynder
14. april 2002 - 21:29 #1
Min er på 10 meter nu! Der stod noget med 100m på kassen, men jeg har ikke nærlæst det!
Avatar billede bdf Mester
14. april 2002 - 21:30 #2
100M det lyder squ vildt!!! Kan man overhovedet købe 100M USB kabel?
Avatar billede francke Nybegynder
14. april 2002 - 21:31 #3
Du skal bare bruge en hub
Avatar billede francke Nybegynder
14. april 2002 - 21:32 #4
Jeg har nu 5m før hubben og 5m efter!
Avatar billede francke Nybegynder
14. april 2002 - 21:33 #5
Du kan købe forlængerkabler
Avatar billede francke Nybegynder
14. april 2002 - 21:36 #6
Næ det bliver til 5m + de 2m fra webcam= 7m efter hubben!
Avatar billede bdf Mester
14. april 2002 - 21:51 #7
Oki men jeg kører med 4M uden hub men hvis det bliver nødvendig køber jeg bare en hub så...
Takker for hjælpen!
Avatar billede bdf Mester
14. april 2002 - 21:51 #8
Kom lige med et svar sådan at du kan få point
Avatar billede oskar Nybegynder
14. april 2002 - 21:59 #9
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.
Avatar billede francke Nybegynder
14. april 2002 - 22:23 #10
ok
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