Multi-Tech Systems MT5600SMI-P34 Serial Pin Configurations, Available with or without LED Pins

Chapter 2 – Mechanical Specifications

Serial Pin Configurations

The serial interface use an 16-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.

				Figure 2–2. Serial SocketModems Pins
				Available with or without LED Pins
			Pin Descriptions for Serial SocketModem Devices
Pin	Signal	I/O		Description
#	Name	Type
1	Tip	I/O		Tip Signal from Telco. Tip connection to the phone line (RJ11 Pin 3).
				SocketModem is Tip/Ring is polarity insensitive.
2	Ring	I/O		Ring Signal from Telco. Ring connection to the phone line (RJ11 Pin 4).
				SocketModem is Tip/Ring is polarity insensitive.
24	–RESET	I		Modem Reset (with weak pull-up). The active low –RESET input resets the
				SocketModem logic and returns the AT command set to the original factory
				default values or to "stored values" in NVRAM. –RESET is tied to VCC
				through a 400ms time constant circuit for "Power-on-Reset" functionality. The
				modem is ready to accept commands within 6.5 seconds of power-on or reset.
				Reset must be asserted for a minimum of 300 ns.
26	DGND			Ground
29	DCDIND			DCD LED. Output from 74AC05 with 1500 Ohms pull-up.
30	RXIND			RX LED. Output from 74AC05 with 1500 Ohms pull-up.

Multi-Tech Systems, Inc. SocketModem MT5600SMI Developer’s Guide 9