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The Modem Data Splitter is a device that can connect two computers or terminals to one modem without switching. The Modem Data Splitter can be used to combine two 9-pin DTE ports to one 9-pin DCE port.
All signals entering the female DCE connectors on pin 3 (transmit data), pin 4 (data terminal ready), and pin 7 (request to send) are diode OR'd together and appear as outputs on the male DTE connector. Pin 1 (carrier detect), pin 2 (receive data), pin 6 (data set ready), and pin 8 (clear to send) are all signals entering the male DTE connector and are connected straight through as outputs on the two female DCE connectors. Signal ground is connected straight through to all ports on pin 5.