Multi-Tech Systems MT2834BLR - Manual (Page 15)

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Chapter 2 - Installation
2.4.1 Out of Service/Test Jumper
When the MT2834 is Out Of Service (OOS), it is busy to incoming calls. In
the Test (default) setting, the modem drives pin 25 high when the modem
is in Test mode. In the OOS (optional) setting, the computer or terminal
forces pin 25 high and puts the modem in a busy condition. Note that
jumper (shorting) plugs are not shipped with the MT2834, but is provided
by Multi-Tech’s Tech Support group on request.
2.4.2 MI/MIC Option Jumper
To activate MI/MIC option (Mode Indicate/Mode Indicate Common
Interface), you must first move MI/MIC jumper plugs. The $MI command,
then controls this function (AT$MI1 enables MI/MIC and AT$MI0 disables
MI/MIC). This option is for applications where the modem's dialing
capability is not used, and dialing is done by an external device (such as a
801 dialer, a computer, or a PBX/CBX system dialer).
Test Setting
(Factory Default)
OOS Setting
(Optional)
MI/MIC Disabled
(Factory Default) MI/MIC Enabled
(Optional)
MI/MIC MI/MIC