User's Manual

Chapter 7 – SocketModem ISDN (MT128SMI)
Multi-Tech Systems, Inc. Universal Socket Hardware Guide for Developers (S000342D) 107
SocketModem ISDN Configuration
Serial Configuration
The MT128SMI SocketModem uses a 23-pin interface.
Note: The bolded, shaded pins are the MT128SMI active pins.
SocketModem ISDN Pinout
Note: Pin 6 is RX+ for ISDN. For the SocketEthernet IP, Pin 6 is RX-.
Pin 7 is RX- for ISDN. For the SocketEthernet IP, Pin 7 is RX+.