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Configuring the Modem
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15
Jumper S3
−
2-wire/4-wire Mode
Settings:
2-wire
4-wire (default)
Jumper
S3
configures the modem for 2-wire or 4-wire operation.
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When configured for 4-wire full-duplex operation, jumper
S5
can
be strapped to maintain constant carrier from the master modem to
all slave modems at all times after the initial training. This enables
the master modem to transmit data to the slave modems, with no
RTS-to-CTS delay. This is the preferred operating mode when
minimum turnaround is desired.
c
When configured for 2-wire half-duplex operation, the modem
encounters an RTS-to-CTS delay when transmitting to slave
modems, increasing the turnaround time. Set jumper
S5
to
controlled carrier for 2-wire half-duplex operation.
Jumper S4
−
Call Turnaround Squelch
Settings:
Enabled
Disabled (default)
Jumper
S4
configures the modem’s Call Turnaround Squelch setting.
For 2-wire, half-duplex communications, set this strap to the Enabled
position. In this position, the receiver is inhibited for a period of time
after the local transmitter is turned OFF. This guards against echoes
caused by the transmission just completed. The time is determined by
the turnaround squelch time option (jumper
S11
).
For 4-wire, full-duplex communications, keep the jumper set to the
default position of Disabled.