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4.4 CONTROL SIGNALS
Sub-channel control signals are combined to provide a composite signal to the main channel.
Control signals from the main channel are passed to all sub-channels in parallel.
The following are details of control signals:
4.4.1 Main Channel Control Signals
4.4.1.1 RSD-20/V.35
RTS (DCD)
In RTS/DCD (CONTROL/INDICATION) contention mode – Follows RTS (DCD) of the selected
sub-channel.
In Data Contention mode –“ON” if RTS (DCD) of one of the sub-channels is “ON”.
CTS
“ON” only when the CTS signals of all active sub-channels are “ON”. A sub-channel is active if it
is connected to a modem and the DSR signal is “ON” (Enables connection of dial-up modems to
the RSD-10).
DSR (DTR)
“ON” if DTR (DSR) of one of the sub-channels is “ON”.
4.4.1.2 RSD-20/X.21
CONTROL/INDICATION
Is dependent upon contention mode and “C/I to MAIN” jumper
If the “C/I to MAIN” jumper is selected for the “sub-channel” state, and the contention mode is
data, then the C/I to MAIN is “ON” if the C/I of one of the sub-channels is “ON”.
If “C/I to MAIN” jumper is in the “ON” state, then the C/I to MAIN is always “ON”, regardless of
the contention mode.
4.4.2 Sub-channel Control Signals
4.4.2.1 RSD-20/V.35
RTS (DCD)
Follows the main channel RTS (DCD) (Unless the sub-channel is disabled).
CTS
In RTS contention mode – Selected channel follows CTS signal of main channel.
In Data Contention mode – sub-channel receives CTS from main channel immediately after it
raises RTS. (Unless the sub-channel is disabled).
DSR (DTR)
Follows the main channel DSR (DTR)
4.1