User's Manual

Chapter 3 – SocketModem (MT5634SMI-34 & MT5634SMI-92)
Multi-Tech Systems, Inc. Universal Socket Hardware Guide for Developers (S000342D) 68
SocketModem Configuration
Serial Configuration
The MT5634SMI SocketModem uses a 20-pin interface to provide an on-board DAA with tip and ring connections,
audio circuit for call-progress monitoring, LED driver for call status annunciation, and serial interface.
Note: The bolded, shaded pins are the active MT5634SMI pins.
Serial SocketModem Pinout
Note: Pin 6 is RX- for the SocketEthernet IP. For ISDN, Pin 6 is RX+.
Pin 7 is RX+ for the SocketEthernet IP. For ISDN, Pin 7 is RX-.
For pin descriptions, see the Universal Pinout Description on pages 10-12.