Sierra Wireless MP 875 - Manual (Page 29)

Hardware and Software Installation
Note: Ensure that all wires are
correctly spliced or crimped.
Improper grounding and wire
connections may lead to
equipment damage or safety
hazards.
Power connections
Connecting the MP modem’s power wires properly is
important—poor connections can damage the wiring, the MP
modem, or the vehicle’s electrical system, and can be
dangerous.
Correct wire splicing
You can splice the wires of the power harness to the car
wiring. Proper splicing is essential to reliable operation of the
MP modem. Do NOT use “quick taps”; they reduce the
integrity of the wire that is cut and let moisture into the cable.
An appropriate method of splicing is to strip a small portion of
the insulation, solder the wires together, then heat-shrink the
connection to re-insulate it.
Crimp terminals
If suitable terminal connection points are available on the
vehicle for power and ignition sense, then using automotive
crimp terminals is recommended. When using crimp
terminals, do not leave bare wire exposed. Do not use a crimp
terminal for more than one wire unless it is designed for that
purpose.
Step 4—Connect MP modem to
computer cable to the MP modem
The MP modem connects to:
• A computer through a USB, Ethernet, or serial port.
• Other optional devices through the DB15HD I/O
connector.
Note: Do not connect the MP modem to the computer until you have
installed the software.
The MP modem connects to a computer using:
• A USB cable (with a Type A connector on the computer
end and a Type B connector on the MP modem end). The
maximum of the USB cable is 5.5-m (18 feet). These cables
are readily available from many suppliers.
• An Ethernet cable with RJ-45 connectors. The type of cable
you use affects the performance of the MP modem. The
minimum requirement for the Ethernet cable is an
unshielded twisted pair (UTP) cable, category 3 or 4. For
better performance, use a shielded, category 5 cable. The
theoretical maximum length is 100-m (328 feet).
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