Sierra Wireless MP 875 - Manual (Page 14)

MP 875 Modem User Guide
Supported GSM radio frequencies
The MP 875 modem has tri-band capability on HSDPA and
UMTS networks, operating on:
• 850 MHz
• 1900 MHz
• 2100 MHz
and quad-band capability on EDGE and GPRS, operating on:
• 850 MHz
• 900 MHz
• 1800 MHz
• 1900 MHz
USB, Ethernet, or serial
computer connection
You can connect the MP modem to a USB, Ethernet (RJ45), or
serial (DB9) port on a computer. When connected to a USB or
Ethernet port, the MP modem behaves like a network card.
When connected to a serial port, the MP modem behaves like a
dial-up modem.
Virtual serial port
The MP modem supports four virtual serial ports (VSPs).
Three are reserved for internal use by the MP modem. The
remaining VSP, which is called Sierra Wireless Application
Interface 2, is assigned to a specific COM port that varies
between users. This VSP can be used, for example, to send AT
commands, or to run applications such as HyperTerminal
®
.
Special MP modem modes such as GPS that are supported on
a serial port are also available on the virtual port. For example,
with the virtual port enabled, a mapping application on your
computer that normally listens for GPS messages on a serial
port listens for those same messages on the virtual port.
The MP modem virtual serial port is available on both USB
and Ethernet interfaces. For information on enabling a virtual
serial port, see the MP 3G Modems AT Command Reference
(document #2130810).
14 2130808