1.2 Physical Description of the Standalone Modem
Figure 1-1 The Standalone Modem Front Panel
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SYNCRO 1496
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V.32bis
1.2.1 The Indicators
The indicators are on the front panel of the modem, which is shown in
Figure 1-1.
RUN
A continuous light means that power is on and the modem is
functioning correctly. A flashing red light indicates that a
test is being performed.
TXD
Transmit Data. A flashing light indicates that data is being
transferred from the local DTE.
RXD
Receive Data. A flashing light indicates that the modem is
sending data to the local DTE.
RTS
Request To Send. A continuous light indicates that the local
DTE is ready to send data. In full-duplex mode this is
normally lit at all times, but in half-duplex mode, only when
data is ready to be transmitted.
CTS
Clear To Send. A continuous light indicates that the modem
is ready to transmit data to a remote modem. In full-duplex
mode this is normally lit at all times, but in half-duplex
mode, lights shortly after the
RTS
indicator.
DCD
Data Carrier Detect. Lit to indicate recognition of a carrier
signal from the remote modem. In full-duplex mode this is
normally lit at all times, but in half-duplex mode, only when
the remote modem has control for transmitting.
DSR
Data Set Ready. Lit to indicate that the modem has control
of the line and is in data transmit mode. During a self-test
with signal injection, indicates errors.
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