User`s manual

Installation
18 User’s Manual - DSP19.2 Fast Poll Modem
S2-5 and S2-6 − Cable Equalizer (Fast-Poll Mode Only)
y S2-5 ON = Enable TX Cable Equalizer
S2-5 OFF = Disable TX Cable Equalizer (default)
y S2-6 ON = Enable RX Cable Equalizer
S2-6 OFF = Disable RX Cable Equalizer (default)
If you use the DSP19.2 as a limited-distance modem over pilot wire or unloaded cables, you
may need to improve or extend the modem’s polling performance on long transmission lines
by using the modem’s internal fixed Compromise Cable Equalizer when polling on long
metallic circuits. The cable equalizer is active only when the modem is in QAM fast-poll
mode (2400 bps or higher).
S2-7 − Anti-streaming
y S2-7 ON = Anti-streaming is active
S2-7 OFF = Anti-stream is inactive (default)
Typically, anti-streaming is used in multi-point applications to prevent a malfunctioning slave
data terminal or RTU from occupying the line indefinitely. When anti-streaming is active, the
modem can transmit data for a maximum of 27 seconds before the transmitter turns off
automatically. The modem then looks for an ON-to-OFF RTS transition before proceeding
with normal operation. Anti-streaming can be selected in either high-speed or low-speed
mode.
S2-10 − RTS-CTS Delay (Bell 202 Mode Only)
y S2-10 ON = 33.0 ms delay
y S2-10 OFF = 8.0 ms delay (default)
Switches S2-10 determines the duration of the RTS-CTS delay in Bell 202 mode.
For V.23 mode, the RTS-CTS delay is fixed at 33 ms.