Short for Data Access Arrangement
, part of a modem s
system for interfacing
with a telephone network. The DAA provides the analog circuits that electrically isolate the modem from the phone line, separating the modem from the telephone line s higher voltage. The FCC
requires this feature of any device that connects to the PSTN
, including fax machines
and set-top boxes
, and most manufacturers build modems around an FCC-approved DAA design.