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6.4
Signal Paths through Multiplexers
The following diagram shows the signal flow between data ports of an
SRX Host multiplexer and an SPL Drop multiplexer.
SRX Host Port
SPL Drop Port
Transmit Data to Receive Data is the normal required path for data
flow.
RTS to DCD is a hardware handshake path used to wake up the remote
device. Many host computers require DCD to issue a login prompt.
Busy to CTS is the hardware flow control path. For CTS/Busy flow
control, the hardware flow control pin of the attached device must be
wired to Busy on the multiplexer.
The DSR output of the multiplexer port is always asserted (high).
Data Terminal Ready (DTR) is an input to the SPL Drop data ports
which is passed through to the attached modem
TxD
RxD
RTS
CTS
DSR
DCD
BUSY
TxD
RxD
RTS
CTS
DSR
DCD
BUSY
DTR
