R1520 Dual-SIM Cellular VPN Router

The R1520 router from Robustel is a versatile 4G router with 5 x Ethernet ports, GPS and E-mark certification for in-vehicle use. It is also ideal for Smart Cities and Retail applications.

Other hardware features include optically isolated digital inputs and outputs as well as a 10-bit analogue input capable of interfacing directly with sensors in the range of 0 to 24Vdc or 0 to 20mA.

Despite being cost-effective, the R1520 is a powerful router with high packet-forwarding capability – way beyond the typical requirements of LTE CAT4 networks. 

Many unique software innovations are built on top of RobustOS, these include:


  • RobustVPN – highly flexible hosted VPN service so customers can easily enjoy a “fixed IP router”
  • Data-Guard – invaluable failsafe in case of a system failure and runaway data usage
  • Smart Reboot – SMS tool to push roaming SIMs from a non-working to working state
  • Sniffer – run a Wireshark trace directly on the router for invaluable diagnostic information.


  • Cost-effective & high performance 3G/4G router
  • Rugged design with 9 to 36Vdc power
  • “Global” 4G version available
  • E-mark certification for in vehicle use
  • Optically isolated digital IO
  • 10-bit Analogue interface for direct sensor connections
  • Supports Dual SIMs & Wifi/Ethernet as WAN
  • Cellular keep-alive and fast failover
  • Extensive range of software “apps” for enhanced functionality
  • RobustVPN – hosted service providing a “fixed IP” router
  • IPsec/OpenVPN/GRE/L2TP/PPTP/DMVPN supported
  • Extensive global certifications


Cellular Interface
Number of antennas2
SIM2, Standard SIM or eSIM
Ethernet Interface
Number of ports5 x 10/100 Mbps,

5 LAN by default, can be configured as 1 WAN + 4 LAN

WAN portSupport 802.3af & 802.3at PD feature on ETH0
Magnet isolation protection1.5 KV
WiFi Interface
Number of antennas2
Standards802.11b/g/n, supports AP and Client modes
Frequency bands2.4 GHz
SecurityWEP, WPA, WPA2
Encryption64/128 AES, TKIP
Data speed2*2 MIMO, 300 Mbps
Type1 x DI + 1 x DO, wet contact
Isolation3 KV
Socket form2 * 3-pin 3.5 mm female socket
Level3 to 30V DC = HIGH, 0 to 1 Vdc = LOW
Absolute maximum VDC30V DC(DI/DO)
Absolute maximum ADC100mA(DI/DO)
Analogue Input
Type1 X AI (can be configured as voltage type or current type)
Voltage input range0 to 24 Vdc
Current input range4-20 mA (current-type input requires external resistance, and finally measured by voltage)
Socket form2 * 3-pin 3.5 mm female socket
Signal definitionAI,AGND
Serial Port
Type1 x RS-232 + 1 x RS-485 serial port
Socket form2 * 4-pin 3.5 mm female socket
Signal definitionRXD TXD SGND RTS CTS(RS-232)

Data+ (A),Data- (B),ground(GND);(RS-485)

Device Interface
1 x GPS interface (Optional, depending on the cellular module)
1 x 480Mbps high-speed USB2.0 interface


Reset button1 x reset button (RST button)
RTCExternal RTC clock , Backup energy storage capacitor can be maintained for 2 days
LED indicators1 x RUN, 1 x MDM, 1 x USR, 1 x RSSI, 1 x WiFi
Built-inWatchdog, Timer
Software (Basic features of RobustOS)
Network protocolsPPP, PPPoE, TCP, UDP, DHCP, ICMP, NAT, HTTP, HTTPs, DNS, ARP, NTP, SMTP, Telnet, VLAN, SSH2, DDNS, etc.
VPN tunnelIPsec, OpenVPN, GRE
FirewallDMZ, anti-DoS, Filtering (IP/Domain name/MAC address), Port Mapping, Access Control
Remote ManagementWeb, CLI, SMS
App Center (Available Apps for RobustOS)
Apps*L2TP, PPTP, DMVPN, VRRP, QoS, Captive Protal, WLAN Multi AP, SNMP, Language, RCMS

Power Supply and Consumption
Connector2 pin 3.5 mm socket with lock
Input voltage9 to 36V DC
Power consumptionIdle: 100 mA@12 V

Data link:1.0 A (peak) @12 V

Physical Characteristics
Ingress protectionIP30
Housing & WeightPlastic, 250 g
Dimensions105 x 90 x 46 mm
InstallationsDesktop, wall mounting and 35 mm DIN rail mounting
RegulatoryPlease refer to ORDERING INFORMATION in the ‘Model’ tab
EnvironmentalRoHS 2.0, WEEE
EMIEN 55032: 2012/AC: 2013 (CE & RE) Class B
EMSIEC 61000-4-2 (ESD) Contact Level 2;

IEC 61000-4-3 (RS) Level 2

IEC 61000-4-4 (EFT) Level 2

IEC 61000-4-5 (Surge) Level 2

IEC 61000-4-6 (CS) Level 2

IEC 61000-4-11 (DIP) Level 2