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Board Components
Jumper
Description
JP1
Mutes the speaker. Default positions are 1 and 2 (speaker is not muted).
JP2 & 4
Testing interface (debugging) for the RS-232 signals.
JP3
Changes the speed of the driver. For Multi-Tech use only. Default positions are 1
and 2 (transceiver operates normally).
JP6 & JP9
JP6 & JP9 are the 5V / 3.3V regulators. The operating voltage factory default
setting is 3.3V.
JP1 jumper must be set to 3.3V.
Warning – Be sure to that 5V / 3.3V jumper is set to match the requirements of
your SocketModem. If this jumper is set incorrectly, damage to the
SocketModem and/or the Test/Demo card could result.
Caution – Use only the provided Multi-Tech Systems, Inc. transformer with the
Test/Demo board. Use of any other power source will void the warranty and will
likely damage the Test/Demo board and the SocketModem. The transformer
connector is keyed to prevent improper connection to the Test/Demo board.
JP7 & JP13
Testing interface (debugging) for the serial TTL signals.
JP8
Enables/disables the Watchdog interface.
JP10 & JP11
100 OHM terminator for ISDN. Default positions are 1 and 2 (off).
JP12
Ties the TX and RX clock lines together. Default positions are 1 and 2 (transmit
and receiver clock act independently.
JP19
Allows a stereo jack feed. Default is ON. If ON, then left and right stereo
channels are combined and form a mono channel.
Switch 3
Sets the alternate ISDN clock. Default position is OFF (the alternate ISDN clock
is off).
Switch Block
Set the switch to the product being used.
Pins and Corresponding Signals
J4 and J7
10 PWR
8
CTS
6
DSR
4
DTR
2
RXD
J2 and J13
2
RXC
Multi-Tech Systems, Inc. SocketModem GSM Hardware Guide for Developers
9
RI
7
RTS
5
GND
3
TXD
1
DCD
1
TXC
Chapter 5 – The SocketModem Developer Board
26
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