Specifications

Chapter 1 – Universal Socket Connectivity
Multi-Tech Systems, Inc. Universal Socket Hardware Guide for Developers (S000342C) 12
Pin
Signal
Name
I/O
Type
Description
38 –CTS O
Clear to Send (Active Low). –CTS is controlled by the module to indicate whether or
not the module is ready to transmit data. –CTS ON indicates to the DTE that signals
on TXD will be transmitted. –CTS OFF indicates to the DTE that it should not transfer
data on TXD.
39 –DCD O
Data Carrier Detect (Active Low). –DCD output is ON (low) when a data
connection is established and the module is ready to send/receive data.
40 –DTR or
PIO6
I
Data Terminal Ready (Active Low). The –DTR input is turned ON (low) when the
DTE is ready to communicate. –DTR ON prepares the modem to be connected, and,
once connected, maintains the connection. –DTR OFF places the modem in the
disconnect state under control of the &Dn and &Qn commands.
Note: When the –DTR pin is not in use, it should be tied low.
SocketWireless Bluetooth (MTS2BTSMI): PIO6 – User definable I/O pin PIO6.
Defaults as input.
41 GND GND
Logic Ground.
42 SPK- O/O
Wireless GSM/GPRS and CDMA (future).
43 SPK+ O/I
Wireless GSM/GPRS and CDMA (future).
56 –LED FDX O
LED Full Duplex (Active Low). LED Output. During normal operation, this pin lights
the FDX LED to indicate a full duplex mode.
57 –LED ACT O
LED Active (Active Low). LED Output. During normal operation, this pin lights the
Activity LED when transmitting or receiving. It flashes at a rate of 50ms high and
50ms low when active.
58 –LEDLINK O
LED LINK (Active Low). LED Output. During normal operation, this pin lights the
LINK LED to indicate a good link is detected.
59 –LEDCOL O
LED Collision (Active Low). LED Output. During normal operation, this pin lights the
COL LED to indicate a collision. It flashes at 50ms high and 50ms low when active.
60 –LEDSPD O
LED Speed (Active Low). LED Output. During normal operation, this pin lights the
SPEED LED to indicate 100Mbps is selected.
61 VCC PWR
DC Input Power. 3.3 V or 5 V DC power, depending upon the build.
62 MICV I/O
Single-Ended Microphone. Single-ended microphone input for dial-up
SocketModem speakerphone and TAM functions.
63 AGND GND
Analog Ground. Analog ground is tied common with DGND on the SocketModem.
To minimize potential ground noise issues, connect audio circuit return to AGND.
64 SPKR O
Speaker. Dual purpose output for call progress signals or speakerphone functions.
Call Progress signaling on MT5600SMI, MT5656SMI, and MT2456SMI-22 is a
square wave output that can be optionally connected to a low-cost single-ended
speaker; e.g., a sounducer or an analog speaker circuit.
Call progress on the MT5634SMI is an analog output.
Speakerphone Output on the MT5656SMI is under the control of +FCLASS. This is
a single-ended analog output. SPKR is tied directly to the CODEC. One side of a
differential AC output coupled through a 6.8K ohm resistor and capacitor.