Specifications

Chapter 1 – Universal Socket Connectivity
Multi-Tech Systems, Inc. Universal Socket Hardware Guide for Developers (S000342F) 22
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
9 RI
7 RTS
5 GND
3 TXD
1 DCD
J2 and J13
2 RXC 1 TXC
Table of Switch Blocks
Switch Blocks and Board
Orientation
Module Style Board Labels & Block
Settings – S4
Board Labels & Block
Settings – S3
Non-ISDN
SocketModems
and
SocketEthernet IP
“MODEM
ETHERNET”
“MT ISDN /
ETHERNET
MODEM”
Standard ISDN
“ALT ISDN
MT ISDN”
“MT ISDN /
ETHERNET
MODEM”
Alternate ISDN
“ALT ISDN
MT ISDN”
“ALT ISDN”
Note: ALT stands for alternate ISDN