Usb And Power Connections - ADDER AdderLink Infinity 100T User Manual

USB and power connections

The ALIF100T unit is designed to be as flexible as possible. It can either operate using
an optional external power adapter (see page 3) or derive all of its power from its
two USB plugs. The main advantage offered by using an external power adapter is that it
allows the ALIF100T unit to be active before the host computer; thus allowing a remote
user to access the host's initial boot up and access the BIOS menu, when required.
If powered by USB only, then both the black and red USB plugs need to be connected.
If powered by external power adapter, only the black USB plug needs to be connected,
for signal purposes. Whenever, the external power adapter is attached and operating,
then power will be taken from it rather than the USB plugs. There is no problem if the
red USB plug remains connected while the power adapter is used.
This is summarized as follows:
Power Black Red
adapter USB USB Power sourcing behavior
û ü ü
Power taken from both USB plugs.
ü ü û
Power taken from power adapter only.
ü ü ü
Power taken from power adapter only, unless it becomes
unavailable, in which case power will be taken from both
USB plugs after a short interruption.
Note: The USB plugs do not operate as a seamless failover for the external power adapter; there
will be a short interruption as operation switches from one power source to the other.
Black USB plug provides
USB signals (plus power if
the external power adapter
is not present)
Red USB plug provides
power only when the
external power adapter is
not present
Host computer
USB ports
From the optional
external power
adapter
6