Apple Macintosh - Macintosh Communications and Modem Use

258 Macintosh User's Handbook
systems including the Mac . Figure 8.2 depicts a Hayes direct
connect modem . The unit contains its own microprocessor so
that it can operate the telephone line according to the instruc-
tions received
from the computer. Since the modem does not
rely upon the op e rator to lift the phone when making or
receiving a call, the modem can perform these actions itself
electronically.
Direct connect modems solve many of the problems
encountered with acoustic modems . They are not as suscepti-
ble
to interference as their predecessors. They can operate the
telephone without assistance. This means that the modem can
be operated remotely with no operator present as long as the
modem is left on and the computer is set up in advance . The
direct connect modem can remain permanently connected to
the phone line. This eliminates the need to dedicate another
telephon e for the modem's use. Th e modem also does not
require a physically compatible telephone receive r.
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Figure 8.2. Dir e ct connect modem