IHSE USA 437 Series DDXi DVI/VGA Extender - Manual (Page 51)

APPENDIX E: USB – HIGH POWER/LOW POWER
51
Appendix E: USB – High Power/Low Power
The USB specification allows low power and high power devices to be
attached to, and powered through, the USB hub. Power consumption may
exceed the internal power capabilities of the Extender if you attach more
than one high power device to the Remote Unit hub. In such cases, you are
recommended to use the supplied PSU for powering the USB hub.
The USB specifications allow:
•
100mA for low power devices
•
500mA for high power devices
The DVI-KVM-U-xx can supply up to 500mA. There is no total power limitation, so
consuming more than 500mA may overload the internal power supply and shutdown
the device. This means, you can attach either:
•
1 to 4 low power units or
•
1 high power unit
If your total USB power consumption exceeds 500mA, you need to connect the
supplied PSU before attaching the devices.
Using the power supply unit, you may attach:
•
1 to 4 high power units or
•
1 to 4 low power units or
•
Any combination of these
Each port has a regulated power limit of 500mA.