Multi-Tech Systems MT5600SMI-L32, MT5600SMI-XL34, MT5600SMI-P92 manual Parallel Pin Configurations

Chapter 2 – Mechanical Specifications

Parallel Pin Configurations

The parallel interface SocketModem uses a 22-pin interface to provide an on-board DAA with tip and ring connections, audio circuit for call-progress monitoring, and parallel interface.

			Figure 2–3. Parallel SocketModem Pins
	Pin Descriptions for a Parallel SocketModem Device
Pin #	Signal Name	I/O	Description
1	Tip	I/O	Telephone Line Interface – TIP
2	Ring	I/O	Telephone Line Interface – RING
24	–RESET	I	Modem Reset (CMOS input 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.
			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.
25	A1		Host Bus Address Line 1
26	DGND	GND	Digital Ground
27	D7	O	Host Bus Data Line 7
29	D2	O	Host Bus Data Line 2
30	INT	O	Host Bus Interrupt Line, Active High, Resets on Low
31	A0	I	Host Bus Address Line 0

Multi-Tech Systems, Inc. SocketModem MT5600SMI Developer’s Guide 11