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Configuring the Modem
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21
SW2-1
−
Fast Poll/FSK (high- & low-speed modes)
SW2-1 ON = Low-Speed Mode (FSK)
OFF = High-Speed Mode (Fast Poll)
SW2-1 configures the modem for either low-speed (FSK) mode or
high-speed (Fast Poll) mode. As a result, the SW2-1 setting you choose
determines the switch definitions for the other switches.
c
For high-speed mode, the configuration switches follow the
definitions in Table 2-1.
c
For low-speed mode, the configuration switches follow the
definitions in Table 2-3.
SW2-2
−
CD Delay (low-speed mode only)
SW2-2 ON = 23 milliseconds
OFF = 6 milliseconds
SW2-2 controls the Carrier Detect (CD) delay and is valid for low-
speed mode only. Setting this switch to 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.
SW2-3
−
Turnaround Squelch Delay (low-speed mode only)
SW2-3 ON = 0 milliseconds
OFF = 8 milliseconds
SW2-3 controls the turnaround squelch delay and is valid for low-speed
mode only. Setting this switch to ON configures the modem to enable
its receiver immediately after the Request To Send (RTS) signal is
turned off. When this switch is set to OFF and the modem is configured
for 2-wire mode (SW2-7 set to ON), the modem squelches the receiver
for 8 milliseconds after RTS is turned off to prevent far-end echoes
from causing data errors.