Installation Manual

Part 1 − Universal Socket Connectivity Chapter 1 – Universal Socket Connectivity
Multi-Tech Systems, Inc. Universal Socket Hardware Guide for Developers (S000342M) 15
Pin Signal
Name
In/Out Description
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 Powe
r
. 3.3V or 5VDC power, depending upon the build.
62
MICV I
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
Speake
r
. Dual purpose output for call progress signals or speakerphone functions.
Call Progress signaling on MT5692SMI and MT2492SMI 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 MT9234SMI is an analog output.
Speakerphone Output on the MT5692SMI 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.