Specifications

Chapter 4 – SocketModem (MT2456SMI-22)
Multi-Tech Systems, Inc. Universal Socket Hardware Guide for Developers (S000342F) 90
SocketModem Configuration
Serial Configuration
The MT2456SMI-22 SocketModem with a serial interface uses a 20-pin interface to provide an on-board DAA
with tip and ring connections, audio circuit for call-progress monitoring and serial interface via logic level signals.
Note: The bolded, shaded pins are active MT2456SMI-22 pins.
Top View
Serial SocketModem Pinout
For pin descriptions, see the Universal Pinout Descriptions in Chapter 1.