MODEM, COMMUNICATIONS (EXTERNAL TYPE). A SELF-CONTAINED ITEM WHICH
MODULATES AND DEMODULATES ONE OR MORE ELECTRICAL SIGNALS. IT CONNECTS
DATA TERMINAL EQUIPMENT TO A COMMUNICATION LINE OR NETWORK SUCH AS
TELEPHONE, RADIO OR TELEGRAPH. IT MAY INCLUDE THE MULTIPLEXING AND
DEMULTIPLEXING CIRCUITS, CIRCUIT AMPLIFIERS AND SOURCE(S) OF CARRIER
FREQUENCY.
