Sierra Wireless MP 875 User Manual

Hardware and Software Installation

Rev 1.5 Jul.08

Install the antennas and cables

Note: When connecting the cables, hand-tighten the connectors; do
not use tools.

To install the Main RF, GPS, and AP antennas:

Mount each antenna according to the instructions
provided with it.

Thread the antenna cables to the MP modem. Secure the
cables as necessary.

Note: To avoid RF interference
problems and possible damage
to the MP modem, do not power
on the MP modem before
connecting the Main RF
antenna.

Connect the Main RF antenna cable to the TNC connector
on the rear of the MP modem.

If you are using GPS, connect the GPS antenna cable to the
GPS antenna connector on the rear of the MP modem.

If you are using WAP, connect the AP antenna cable to the
AP antenna connector on the rear of the MP modem.
(MP 875 only)

Figure 3-5: The MP modem’s SMA connector for the GPS and AP antennas
(top), and the TNC connector for the Main RF antenna (bottom).

The AP antenna must be installed by a professional and there
must be a separation of at least 20 cm. between the AP antenna
and the main RF antenna.

Note:

Step 3 — Install the power harness

In a typical installation, the MP modem is connected to the
vehicle’s battery with the power harness. The MP modem
supports a voltage range between 9 volts direct current (VDC)
and 36 VDC, and is designed for both 12 VDC and 24 VDC
vehicle electrical systems.

GPS antenna

Main RF antenna

AP antenna

Serial Host

Main RF

USB Host

GPS

Ethernet Host

Power

I/O