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Configuring the Modem
Page 19
wire, half-duplex mode (SW3-7 ON), the modem squelches the
receiver after RTS is turned off to prevent far-end echoes from causing
data errors. The duration that the modem squelches the receiver is
either:
8 milliseconds if the modem is configured for Bell 202 mode
(SW2-1 OFF)
150 milliseconds if the modem is configured for ITU-T V.23 mode
(SW2-1 ON)
SW2-3 FSK Soft Carrier (Bell 202 FSK Mode Only)
SW2-3 ON = None
OFF = 8ms
SW2-3 controls the soft carrier and is valid for Bell 202 FSK mode
only (SW2-1 set to OFF). Setting this switch to OFF configures the
modem to transmit a 900 Hz soft carrier to the remote modem for 8
milliseconds after RTS is turned off. Setting this switch to ON prevents
the modem from transmitting a soft carrier after RTS is turned off.
SW2-4 and SW2-5 RTS-CTS Delay (Bell 202 Mode Only)
Switches SW2-4 and SW2-5 determine the duration of the RTS-CTS
delay in Bell 202 mode. Table 2-4 shows how to set these switches to
select the appropriate setting.
Table 2-4. RTS-CTS Delay Settings in Bell 202 Mode
To Select
a Delay of…
Set SW2-4 to… And Set SW2-5 to…
8ms OFF OFF
33ms OFF ON
59ms ON OFF
219ms ON ON