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Interface description
Polarity reversal protection
Polarity reversal protection is implemented
by means of a power diode. The diode has
a reverse voltage of 400 V.
Overvoltage protection
Overvoltages are suppressed by a Zener
diode after the polarity reversal protection
diode.
Fuses
A permanently installed, non-replaceable
fuse in the modem ensures electrical
safety in the event of faults. Connect
a fast 1.25 A fuse to the supply line of
the positive supply voltage for general
protection of the modem, see “Safety and
installation information” on page 11.
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