Elektronik GmbH
USB hub 3.0 8-Port
Manual
Seite 9 von 22
6.
Function of the USB-Ports
6.1.
Operation Mode
The USB hub provides eight super-speed capable USB 3.0 ports. Each port can be placed in one of four
modes. These four modes are:
1.
Standard port (SDP):
If the maximum current is exceeded, the port is turned off.
2.
Charging capable port (CDP):
Like the Standard port, but is detectible as a loading enabled USB port on the connected USB device
according to USB Battery Charging Specification V1.2 (USB-IF BC1.2 CDP).
The current is limited to the configured value.
3.
Dedicated Charging Port (DCP BC1.2)
The port is detectible as a dedicated charger connected USB device according to USB Battery Charging
Specification V1.2 (USB-IF BC1.2 DCP).The current is limited to the configured value.
In this mode, USB communication with the connected device is not possible!
4.
Charger Emulation Port
The port reconciles with the connected device on a charging protocol. In addition, different variants are
tested sequentially, including BC1.2 DCP, YD/T-1591 (2009) as well as compatibles with many portable
devices from Apple ® and RIM ®. The current is limited to the configured value.
In this mode, USB communication with the connected device is not possible!
DCP-Ports no longer appear in the device manager of Windows. But they can be active even without a
connected host.
Because of the variety - even custom specific - charging schemes, there can be no assurance that the
battery charge is achieved with a particular mobile unit and no damage will occur!
6.2.
Attach Detection
The USB ports have a feature to detect when a USB device is attached. This also works for attached devices
using only the power from the port (e.g. USB fans, or reading lamps). The attach detection can be switched
off individually for each port, if the small testing current should lead to unexpected problems.
In the CDP mode it is possible that the connection of such a device is recognized, but its removal is
undetected. But this has no effect on the other functions of the USB hub. The connection of a normal USB
device or the switching on and off of the port resets the attach detection.
