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Chapter 2 – Activation and Installation
Multi-Tech Systems, Inc. MultiModem CDMA Wireless Modem User Guide 14
Power
Plug the power supply cable into the modem.
For two-piece transformer power supply (International).
• Connect the AC cord receptacle into the transformer block.
• Connect the AC cord plug into the mains power outlet.
For one-piece transformer power supply (North America).
• Connect between the MultiModem power receptacle and the mains power outlet.
For optional direct-DC powering.
• Connect the direct-DC power supply cable into the DC power source on the vehicle or machine in
which you are mounting the modem. Be sure the GND connection is correct.
• Connect red wire to + (positive) and black wire to – (negative).
Note: Units shipped with the universal AC power supply are not suited for installation in hazardous
locations.
Note: For automotive application: according to the type of application, you can use permanent “+” or key-
switched “+”. Connect the power supply to its source (for example, in a mobile situation, to the
vehicle’s DC fuse/terminal block).
Warning: Do not connect your wireless modem directly to a vehicle’s battery for your power
source. Doing so may cause power spikes. If you wish to use the battery as a power source,
add a filtering device to the DC input.