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Chapter 2 – SocketModem (MT5600SMI & MT5656SMI)

Multi-Tech Systems, Inc. Universal Socket Hardware Guide for Developers (S000342C) 46

Differences - Legacy Voice Modems and

Current Modems

Differences between the SFxxxD/SP and the MT5656SMI

Note: The SFxxxD/SP is the legacy voice modem with speakerphone I/O.

Pin 54 – “VC” This pin provided a reference voltage that is available from the data pump. This pin is not

supported on the MT5656SMI SocketModem.

Pin 55 – “~Voice” This function, when active, closes the relay to switch the handset from the telephone line to a

current source to power the handset where it could be used as a speaker and microphone

interface to the modem. This pin is not provided on the SocketModem

Pin 57 – “LCS” (Line Current Sense) When enabled, the LCS input indicates whether the associated handset

of off-hook (high) or on-hook (low). This pin is not available on the MT5656SMI SocketModem,

but the functionality is part of the Smart DAA.

Pin 58 – “Telout” (Telephone Handset Output). This pin is not supported on the SocketModem.

Pin 59 – “Telin” (Telephone Handset Input). This pin is not supported on the SocketModem.

Pin 60 – “Micm” (Microphone Modem Input). This pin is not supported on the SocketModem.

Pin 62 – “Micv” (Microphone Voice Input). This pin is supported on the MT5656SMI SocketModem in the same

way as the "SF" modem.

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Multitech MT5600SMI Dokumentacja Strona 46