Hi Bob:
The 120 ohm resistor you mention is typically placed across the line on the
transceiver chip side of the isolation transformer. While you might be able
to get away with putting it on the line side, I do not see how this would
provide any protection. There is a big difference between
Hi Bob,
Some old designs did use carbon composition resistors as a "fuse".
The problem with this design is that the resistor would open whenever
overcurrent conditions occured. That was good for safety but bad for
customer satisfaction. Customers often didn't see or notice the
overcurrent condi
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