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3.1.3 USB AND POWER CONNECTIONS
The Agility Zero U Transmitter 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 Agility Zero U Transmitter 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
Host computer
USB ports
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
WW
W.B
LAC
KB
OX
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M
WW
W.B
LAC
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From the optional
external power
adapter
operation switches from one power source to
the other.