DSP9612RM USER’S GUIDE
0049-0519-000
Page 13
REV.D
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
When the modem is configured for V.23 operation (SW2-1 ON), the RTS-CTS
delay is fixed at 33 ms.
SW2-6
⎯
FSK CD Delay (Bell 202 Mode Only)
SW2-6
ON = 23ms
OFF = 6ms
SW2-6 selects the FSK CD delay and is valid when Bell 202 mode is active
(SW2-1 OFF). Setting SW2-6 ON configures the modem to turn on CD 23
milliseconds after it detects a valid carrier signal. Setting this switch to OFF
configures the modem to turn on CD 6 milliseconds after it detects a valid carrier
signal.
This switch setting is deactivated when the modem is configured for V.23 mode
(SW2-1 ON) and a delay of 18 milliseconds is used instead.
