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MultiModemISI Hybrid Series, ISIHI-2S 129
Appendix
Appendix C: Pin Assignments
The MultiModem Hybrid Series comes with either U-interface or S/T-interface network
connection cable, and analog fax/modem DAA. The U-interface connection cable is for
direct ISDN line connection, which does not need any extra ISDN NT1 device. The S/T-
interface connection cable is for connecting to NT1. Both the U- and S/T-interface use an
RJ-45 phone jack but with different pin assignments. The bundled RJ-45 phone cord can
be used for both U- or S/T-interface connections. The fax/modem DAA uses an RJ-11
phone jack to connect to PSTN (analog telephone line) directly.
The RJ-45 Pin-outs of U-interface
Pin 1 Not connected
Pin 2 Not connected
Pin 3 Not conntected
Pin 4 Signal
Pin 5 Signal
Pin 6 Not connected
Pin 7 Not connected
Pin 8 Not connected
The RJ-45 Pin-outs of S/T-interface
Pin 1 Not connected
Pin 2 Not connected
Pin 3 Transmit signal (T1)
Pin 4 Receive signal (R1)
Pin 5 Receive signal (R2)
Pin 6 Transmit signal (T2)
Pin 7 Not connected
Pin 8 Not connected
The RJ-11 Pin-outs of Analog Fax/Modem DAA
Pin 1 Not connected
Pin 2 Not connected
Pin 3 Tip
Pin 4 Ring
Pin 5 Not connected
Pin 6 Not connected