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Data transfer speeds for syncing:
Cambrionix performed tests on the C3
board to see how quickly it can
simultaneously sync 16 devices. They
calculate that it takes approximately
5.3 minutes to transfer a one gigabyte
video file to 16 iPads. For a full
report of their test, their assumptions
and equipment used, please look at this
PDF.
Cambrionix C3
Benchmark Testing
Charging speeds
for iPads:
We ran some tests, charging iPads that
had been completely depleted, to see how
long various methods took to re-charge
them from 100% empty to 100% full.
We found the following:
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USB port 2.0:
On a desktop
PC, it took 13 hours 30 minutes to
charge a single iPad through the
trickle charge on the USB port. The
iPad does not display that the unit
is charging. We have heard that this
can take longer if it is done on a
computer or notebook that goes into
sleep mode.
On
some multi-USB hubs (even powered
hubs), the USB charge shares the
available power supply and would
tak e even longer. On one 24-port hub
we reviewed, the unit had a 22.5W
power supply which gives less than
200mA per port so trickle charging
would take more than twice as long
as even the worst PC port. If the
iPad is used daily for a few hours,
the net charge in the iPad (if
charged on this hub each evening)
would go down.
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Plugged into the Cambrionix C3 USB
board:
This is the sync-and-charge device
used within the Datamation Systems
cabinets and carts. A complete
empty-to-charged cycle took 4 hours,
35 minutes. According to Cambrionix,
the charging time is the same as it
is using the charging block supplied
with the iPad itself. This would be
the time required whether you are
re-charging one or 16 iPads, as each
port is provided with the full power
required.
Computer control
mode: Extra value for advanced
users:
The C3 board used in the Datamation
Systems sync charge devices was designed
by Cambrionix to permit users to control
at will individual USB port states
(sync, charge or disconnect). Using a
terminal application (such as ZTerm,
HyperTerminal or RealTerm) or a simple
host application or script developed by
the user, this computer control mode
adds added value and flexibility. For
example, a user can write scripts that
would turn on the device or individual
ports or change modes at specific times
of day. Combined with customer-created
software applications, arrays of iPads
can be controlled through their
individual ports.
A USB to serial cable is required if
full port control is required.
The same capability can be used with
iPods, iPhones and other Apple devices
that are compatible with the C3 board.
This is the only iPad/USB charging and
syncing device that provides this
feature for the advanced user.
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