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Integrator’s Reference Manual
7-16 80-99208-1 Rev. D
Caution
You CANNOT have both a DC power supply and an AC adapter
connected to the modem at the same time. This may cause the modem
to fail to power up and may damage the modem. If you connect the
Diagnostic cable to service-program the modem while using a DC
power source, make sure the AC wall adapter of the Diagnostic cable is
not plugged in to an AC outlet.
Surge Protection
As an OEM, you are responsible for ensuring that the input
voltage specification will never be exceeded.
Minimal transient protection is provided on the GSP-1620
modem board but this is intended only for low
energy/duration events (total transient power less than 1
kW). It is not intended to protect the modem in case of a
sustained over-voltage/lightning condition.
The use of a fuse is strongly recommended in the power
supply connecting to the GSP-1620 modem. The input surge
current requirements of the GSP-1620 modem are such that
a fuse with a minimum melting I
2
t rating of 0.02 A
2
seconds
will be sufficient.
EMI Filtering
Adequate conducted EMI filtering has already been provided
in the GSP-1620 modem to pass FCC and ETSI limits.
Additional filtering should not be necessary to meet these
requirements.
Caution
Should additional filtering be necessary, you must take precautions to
ensure that the above criteria are not violated. Please contact
QUALCOMM Incorporated for further details in such a case.
Power Consumption
Power consumption depends on a variety of factors such as
transmit power, input voltage, and data rate. Table 7-3
summarizes the power consumption of the GSP-1620 modem
at an input voltage of +12 V DC. All power estimates include
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