COURIER HIGH SPEED MODEMS
MI/MIC OPERATIONS (EXTERNAL MODEMS ONLY)
DESCRIPTION
Mode Indicate/Mode Indicate Common (MI/MIC) closure is required by some installations whose existing hardware does the dialing. The modems do not Auto Dial.
In these situations, the modem must be forced off hook in Originate mode. This is done by shorting (closing) two of the pins (not Tip and Ring) in the phone connector. The modem is then ready to go online and accept data when it connects with the number dialed by the system equipment.
Courier modems are shipped with MI/MIC disabled, that is, for normal use. To set the modems for MI/MIC closure, you must do two things: physically set jumpers on the modem’s printed circuit board, and enable bit 5 of Register S34 (ATS34=32 or ATS34.5=1). We recommend you then write that setting to NVRAM as a
Once you've set Register S34, have the system force the modem off hook by closing the MI/MIC leads in the phone line connector. The modem's OH (Off Hook) status light, or LED, goes on when the modem goes off hook.
SETTING THE MI/MIC JUMPERS
You'll have to dismantle the modem case to set the two jumper switches on the printed circuit board, as follows:
1.Power off the modem and disconnect all of its cables.
2.Turn the modem upside down. Remove the two square vinyl feet near the back of the case, on either side of the bottom label's DIP switch diagram. Be careful to put the vinyl feet aside, upside down, where they won't become stuck to another object.
3.Remove the two Phillips screws located in the wells beneath the vinyl feet.
4.Gently pry off the plastic volume
5.Raise the back end of the case bottom until it is at about a 60° angle; lift it away from inside the front of the modem. Put the case bottom aside.
Additional Operations
