Compact industrial routers designed to provide robust and high-speed wireless Internet connectivity over 3G or LTE cellular network for industrial, M2M/IoT and commercial applications.

Devices can be efficiently employed at remote automation facilities. It is recommended to use the GTR routers in M2M solutions area, where quick and secure data transmission over the protected channel is required.

Linux-based OpenWrt operating system capabilities (Firewall, NAT, VPN, etc.) allow creating secure VPN networks and ensure reliable communication system functioning between various nodes.

Application Areas
— AMR/AMI systems, smart grids
— Small business, SOHO network
— Power and energy industry
— POS terminals, ATM, vending
— Security systems (alarm, warning, IP video surveillance etc.)


GTR routers are manufactured in robust aluminum enclosure and can be mounted on a wall or DIN rail.
Series includes the following model lines:

GTR30 - 3G Router line, modem speed – up to 7.2 Mbps GTR40 - 4G Router line, modem speed – up to 100 Mbps


ModelConnection TypeGPSSupercapacitor


2 x Ethernet 10/100Base-TX (LAN/WAN)

Cellular 3G or 4G modem providing secure Internet connection in any place, where the mobile operator's network coverage is available

2 x SIM card slots providing communication channel redundancy

Hardware Watchdog timer for router reboot in case of software failures

4 x I/O lines supporting three operation modes: voltage measurement, resistive sensors connection, load control

Linux-based OpenWrt® operating system allows to create secure VPN networks and install user software packages to customize router configuration

1 x RS-232, 1 x RS-485 serial ports. Modbus-TCP - Modbus RTU/ASCII conversion

Temperature compensated real-time clock (RTC) providing high timekeeping accuracy


Additional options can be selected depending on user requests:

GPS module for precise location determination and high accuracy time synchronization (up to 1 msec)

Supercapacitor that provides router back-up power supply for two minutes in case external power supply is disabled


The main function of industrial 4G/3G GTR router series is to ensure reliable connectivity solution for AMR/SCADA systems to easily monitor and control remote equipment.

Router provides secure remote access for IoT devices over the 4G network. To create an IoT network, connect meters, sensors, PLCs, to GTR IO lines. IO lines can be configured to operate in 3 modes: voltage measurement, connection of resistive sensors, and load management.

In addition, GTR routers have RS-232 and RS-485 serial ports and support  Modbus RTU/ASCII to Modbus TCP conversion, that is, act as a gateway, providing a transparent data transfer channel between devices.

Router is managed using Linux-based OpenWrt operating system. All parameters can be easily configured via the convenient Web Interface.


GTR30 / GTR40
Network ParametersGTR30:
Frequency Range – HSPA 900/2100
Rate (DL/UL) – 7.2Mbps (DL)/5.76Mbps (UL)

Frequency Range – LTE B1/B3/B7/B8/B20, UMTS/HSPA+ B1/B5/B8
Rate (DL/UL) – 100Mbps (DL)*/50Mbps (UL)
*no more than 30 Mbps under real conditions
CPUNXP i.MX287 454 MHz
RAM Memory128 Mb
Flash memory256 Mb
Power SupplyVoltage: DC 10 ~ 50 V
Current: 400 mA (24 V)
Connector: MicroFit 4-pin
Ethernet2 x RJ-45 10/100 Mbps
USB1 x USB2.0 A type (Host/Device)
SIM2 x mini-SIM
RS-2321 x DB9-M. Rate: 1200-15200 bps.
RS-4851 x 2-pin terminal block. Rate: 1200-115200 bps. Termination resistor: connected 120 Ohm
IO linesx4
Operating modes: voltage measurement, resistive sensors connection, load control.
Max. voltage: 50V (max. measurable voltage: 18V).
Max. current (per channel): 60mA
SD card1 x microSD
Operating SystemOpenWrt (Linux-based)
Network ServicesGRE, IPIP, OpenVPN, L2TP, PPTP, PPPoE etc, NAT, MPLS, DHCP (server/client)
Management- LuCI web interface
- command line (SSH)
Protocol ConversionModbus RTU/ASCII ↔ Modbus TCP
Reliability- dual SIM card slots,
- hardware watchdog timer,
- Multi-WAN
SecurityIPSec/VPN, Firewall IPRoute, IP/MAC filtering
Antenna connector1 x SMA(f)
Dimensions (L x W x H)97 x 78 x 36 mm
Weight180 gr
EnclosureAluminum Alloy (IP30)
Operating temperature-40°C…+70°C
Warranty2 years