Thread: Acoustic Modem
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Jan8-10, 02:57 AM
Sci Advisor
P: 4,044
is this a underwater communication model?

No, these were used 25 years ago, mainly if you were unable to access the phone line directly, like in a hotel room.
It used to be illegal to plug anything into the phone line unless it was type approved, so acoustic modems were good for getting around this.

If yours is for underwater use, none of the above probably applies.