US Robotics USR3520 User Manual page 6

The gateway can be user-customized with Option expansion cards available from select electronics
distributors. The USR3516-EMU Modemulator card that is pre-loaded in the primary expansion slot can
be removed and replaced with another expansion card, and the secondary expansion slot can be loaded
with an expansion card. Contact a USRobotics Sales representative for more details.
The base unit consists of:

Light weight aluminum housing with DIN rail and

Two SMA-type antenna

WLAN, GPS, System, and WWAN LEDs showing system status and signal strength

10/100 MB/s RJ-45 Ethernet interface

Primary expansion slot pre-loaded with USRobotics Modemulator card: USR3516-EMU

9-33 VDC power in with Micro-Fit™, dual row, 4-circuit connector

Available secondary expansion slot

Internal main board with WWAN module, Ethernet interface and GPS

Freescale i.MX280 450MHz Processor
o 64 MB Ram
o 128 MB Flash
o GTM68X WWAN module
Base Unit Versions
Two versions of the base unit exist:

USR3520
o Contains the GTM689 cellular radio module which provides CDMA/EVDO and WCDMA
technology.
o Used in the U.S. and Canada and has the correct

USR803520
o Contains the GTM681 cellular radio module which provides WCDMA technology.
o Used in Europe and has the correct
Revision: 1.00
interfaces: WWAN Main and WWAN Div/GPS
certification and approvals
Copyright 2015 U.S. Robotics Corporation
wall mounting options
certification and approvals
for these countries.
for these countries.
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