3Com 3C19250 - USB Ethernet Network Interface Card User Manual page 15

LAN Adapter Support, Universal Serial Bus (USB) Ethernet Support Device Driver.
©2003, Jonas Buys.
USB OTG
Hi-Speed USB
Firewire
UHCI; Universal Host Controller
Interface
OHCI; Open Systems Host
Controller Interface
EHCI; Enhanced Host Controller
Interface
60MBps (40 times faster as USB 1.1). If you
attach a USB 1.1 device on a USB 2.0
controller, then that device will function
correctly, but at USB 1.1 transfer rates. IF
YOU PURCHASE A DEVICE WITH USB 2.0,
THAT DOESN'T ALWAYS MEAN YOU GET HI-
SPEED (480Mbps)! USB 2.0 contains all
existing speeds: low (1 ½ Mbps), full
(12Mbps) and high (480Mbps).
Addition to USB 2.0: USB On-The-Go. Peer
to peer USB; using this technology, USB
devices can communicate with one each other
without intervention of the PC.
New standard for USB devices. Increases the
data transfer rates from 12Mbps to 480Mbps
(60MBps) on Hi-Speed USB controllers.
Backwards compatible with the original USB;
uses the same wires!
New port for branching devices, in particular
video devices. At present, hardware
manufacturers tend to release other devices
for this bus. Sony accept this technology
under the name iLink. 12 ½ to 50 MBps.
One particular direction in the USB controller
interfaces. It is used by Intel and VIA
chipsets. Other brands also can be
compatible with UHCI. This is the real
standard for USB 1.1. nVidia nForce is also
UHCI.
Another particular direction used mainly by
SiS,ALI, Opti, Cyrix (Gnode).
A direction that enables USB 2.0, more to say
USB Hi-Speed.
JBHWIS00001.
www.os2warp.be