-- Power for a modem overseas
This is not a problem. Buy a grounded isolation transformer in the country of
use, plug the modem's wall outlet transformer into this converter, and the
modem's power supply regulates the voltage internally. You should thoroughly
investigate the voltage and frequency of the power source, however.
-- Different Protocols
A number of overseas countries use the French standard "CCITT" protocol for
modem communications. The systems of some countries may not be suitable for
clean data transmission or may not allow communication except on specially
conditioned lines.
-- Special Laws restricting data communication
German law, for example, requires a permit to use a communications device. You
should acquaint yourself with any national, regional, or local laws or
conditions on using modems.