Attaching USB devices
6
The EZ-USB 2.0 allows connections with USB 2.0 “Hi-speed” devices, and is
“backwards compatible” with older USB 1.0 and 1.1 devices. You may attach
any combination of these devices to either port on the Adapter cable.
The EZ-USB 2.0 Card will detect what type of USB device is attached and auto-
configure the port for the fastest possible communication speed. No user
intervention is required. Older USB 1.0 and 1.1 devices will communicate at the
original USB rates (up to 12Mb/sec). USB 2.0 enabled devices may communi-
cate with the EZ-USB 2.0 Card at speeds of up to 480Mb/sec.
Adapter Cable and USB ports:
As part of the USB hardware specifications, USB Hubs and Host Controllers
are required to provide a limited amount of power for USB devices. Some
USB devices may require this power to initialize and communicate with the
host controller. Smaller USB devices may run off bus power only.
The EZ-USB 2.0 Card draws power for it’s USB devices directly from the
laptop;
No additional power cables are required.
The Adapter Cable provides
one full-powered (500mA) port, and one low-powered (100mA) port. The
power ratings for each port are clearly marked on the Adapter Cable at the
side of each USB port.
High Power (500mA):
Use this port to connect with any USB-compliant device.
Low Power (100mA):
Use this port to connect with “low powered” USB devices (mice, keyboards,
etc.) or devices that have their own power supply (monitors, scanners, etc.).
USB Hubs:
Although the EZ-USB 2.0 Card provides enough power for 2 USB devices,
the total power available may vary, depending on the laptop design and
available battery power. For this reason, EZ-USB 2.0 is not recommended
for use with non-powered USB expansion hubs. The EZ-USB 2.0 Card may
be used with self-powered hubs to connect up to 127 additional devices.
