Volker Kuhlmann wrote:
Now the plugpack is annoying, both because it exists, and because it
takes up at least 2 places on the power strip. The modem wants 9V AC,
though I suspect it is in fact not AC but any polarity. In that case it
And most definitely as requirement of the device having a big tick permit for
connection to the Telescum network.
Sorry, please explain. You make no electrical engineering sense.
The power pack forms a part of the telepermit as a whole, it has to be
rated for safety reasons.
Most external modems require an AC plug pack either for the negative
serial port voltages,
or other internal uses I think some older nvram required a negative
voltage, more modern
modems often have a switch mode power supply for isolation and use a
cheaper AC plug pack.
I have one modem here which half works with a DC plug pack I just don't
get any received data
due to the serial port in the modem not swinging negative -- it will
dial out using AT codes and
handshake replace the plug pack with a AC one and it all works fine.
Simon Knight
If you're referring to the AC, I usspect D-Link simply decided to put a
rectifier into the modem and left it out of the plugpack, to protect
those from themselves who plug in an AC pack had the rectifier been
moved to the pack.
Volker
