Multitech CC1600 Series, Owner'S Manual

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Chapter 2 - Installation and Connection
2.5 OOS (Busy Out) Toggle Switch
The MT2834BLR contains a two-position OOS switch on the front panel. This switch can be used to
create a “busy out” (OOS) condition for the modem (i.e., take the modem off-hook).
To place a modem in the Busy condition, move the OOS toggle switch to the (BUSY) position. The
modem then goes off-hook, its OOS and OH LEDs light, and incoming calls to this modem get a busy
signal. If you suspect a problem with a particular modem, you can use the BUSY switch to have an
optional device (such as a “hunt group”) that looks for a non-busy line to perform a “roll over” to the
next available modem while you check the status of the Busy modem.
2.5.1 Out of Service/Test Jumper
When the MT2834BLR 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.
Test Setting OOS Setting
(Default Setting) (Optional Setting)
2.5.2 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).
M/MIC Option Disabled M/MIC Option Enabled
(Factory Default Setting) (Optional Setting)