Black Box 32144 Manual page 156

MODEM 32144
Control is disabled, front-panel
screens that do not affect the
modem configuration (such as
AUTO-DIAL and test modes)
will function.
Speaker
Two speaker options are available:
Speaker Control and Speaker
Volume.
Speaker Control
All modes
ON. Speaker is on during the full
modem handshake process and
while the unit remains on-line.
OFF. The speaker is off; the call
cannot be audibly monitored.
ON TILL CD. Speaker remains
on until a carrier signal (CD) is
detected.
Speaker Volume
All modes
The speaker volume can be set
to LOW, MEDIUM, or HIGH.
Guard Tones
Hayes, V.25 bis, Dumb modes
Guard tones are used—in V.22
and V.22 bis modes only—to assure
proper band separation on systems
that use international telephone
circuits. Unless you will be using
international circuits in one of
64
these modes, you should turn the
guard-tone option OFF. If guard
tones are required, their frequency
can be set to 550 Hz or 1800 Hz
(the most commonly used guard-
tone frequency).
V.13 Operation
V.25 bis, Dumb, Leased-line modes
(synchronous operation only)
OFF. V.13 operation is off. This
setting allows normal full-duplex
operation. (All other selections are
for enabling V.13 operation.)
TX ONLY. Status of RTS will be
sent to remote modem.
RX ONLY. Carrier Detect (CD)
will be controlled by V.13 signals
from the remote modem.
TX AND RX. Status of RTS will
be sent to remote modem, and CD
will be controlled by V.13 signals
from the remote modem.
To select one of the four V.13
options, press pushbutton 1 or 3—
with the V13 screen displayed—
until the selection you want is
displayed. For half-duplex point-to-
point applications, select TX AND
RX. For multidrop-type
applications, select RX ONLY for
all modems at the host site and TX
ONLY for all modems at the
remote site.