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Hardware Quick Reference for LANCOM 1790-4G+ Router

Quick setup guide for the LANCOM 1790-4G+ router. Includes hardware connection instructions, SIM card installation, LED status indicators, and technical specifications.

Quick answers from the manual

Quick answer

  • The LANCOM 1790-4G+ is a high-performance mobile VPN router. To set it up, connect the cellular antennas, WAN cable, and power adapter. Insert the SIM card into the bottom slot if using cellular connectivity. p. 1

Key actions

  • Connect antennas p. 1
  • Insert SIM card p. 1
  • Connect power p. 1

First start

  • Connect antennas, WAN, and Ethernet cables, insert SIM card, and connect power adapter. p. 1

Problems and fixes

Device reset

Short press the Reset button to restart; long press to reset.

p. 1

Maintenance and reset

  • Use the Reset button (operated with a paper clip) for restart or reset. p. 1

Technical specifications

Parameter Value Meaning Pages
Power supply 12 V DC External power adapter with bayonet connector p. 1
Power consumption Max. 9 W Maximum power draw p. 1

Where to find it in the PDF

  • Hardware Quick Reference p. 1
Table of contents

Manual images

Click an image to enlarge
SIM card slot location Page 1 LED status table Page 1

Quick guide from the manual

The LANCOM 1790-4G+ is a high-performance mobile VPN router. This guide provides essential information for hardware installation, including antenna connection, SIM card insertion, and port configuration. Ensure the device is operated with a professionally installed power supply and that ventilation slots remain clear at all times.

Installation and Connection

SIM card slot location
SIM card slot location
  1. LTE / 4G Antennas: Connect the two supplied cellular antennas to the connectors labeled Ant 1 and Ant 2.
  2. WAN Interface: Connect your WAN modem to the WAN interface using the provided Ethernet cable with dark green connectors.
  3. Ethernet Interfaces: Use the cable with green-colored connectors to connect one of the ETH 1 to ETH 3 interfaces to your PC or LAN switch.
  4. SIM Card Slot: Located on the bottom of the device. Release the SIM-card holder, lever it upwards, slide the SIM card into the guide slot, and press the holder down until it clicks into place.
  5. Configuration Interface: Use the serial interface for configuration (requires an optional serial configuration cable).
  6. USB Interface: Connect a USB printer or USB memory stick as needed.
  7. Power: Connect the power cable and turn the bayonet connector 90° clockwise until it clicks into place. Use only the supplied power adapter.

Setup Notes

  • The power plug must be freely accessible at all times.
  • For desktop operation, attach the adhesive rubber footpads.
  • Do not place objects on top of the device.
  • Keep all ventilation slots clear of obstruction.
  • For wall mounting, use the supplied drilling template.
  • Rack installation is possible with the optional LANCOM Rack Mount.

LED Status Indicators

The device features several LEDs to indicate status:

LED status table
LED status table
  • Power: Indicates device operation and LMC (LANCOM Management Cloud) status.
  • Online: Shows WAN connection status.
  • WAN: Indicates synchronization and data transmission status.
  • ETH: Shows network device connection and data traffic.
  • 4G: Indicates cellular interface status, logon, and hardware errors.
  • VPN: Shows VPN connection status.
  • Reset: Use a paper clip for a short press to restart or a long press to reset the device.

Technical Specifications

  • Power Supply: 12 V DC, external adapter (230 V) with bayonet connector.
  • Power Consumption: Max. 9 W.
  • Environment: Temperature 0–40 °C; humidity 0–95% (non-condensing).
  • Interfaces: 4G (Ant 1, Ant 2), WAN (Gigabit Ethernet), 3x ETH (Gigabit Ethernet), USB 2.0, Serial Config (V.24).
  • Housing: Robust synthetic housing, wall-mountable, Kensington lock.

Manufacturer information

LANCOM Systems GmbH

Brand profile
Manufacturer website https://www.lancom-systems.com Support https://support.lancom-systems.com Manufacturer manuals https://www.lancom-systems.com

Practical help

Common problems

4G LED is permanently red

Indicates a hardware error or the module is unavailable.

Power LED is blinking red/green

Configuration password is not set; the device data is currently unprotected.

WAN LED is permanently red

Indicates a WAN connection error.

Device not connecting to LMC

Check for 3x green inverse blinking on the Power LED, which indicates an LMC communication error.

Before use

  • Ensure the power plug is freely accessible.
  • Attach adhesive rubber footpads if using on a desktop.
  • Keep ventilation slots clear of obstruction.
  • Use only the supplied power adapter.
  • Ensure the SIM card is correctly inserted into the bottom slot.

Specs in practice

Power Consumption
Maximum 9 W; ensure the power source can handle this load.

Images and diagrams

  • Ant 1/2: Connect cellular antennas here.
  • WAN: Connect your internet modem here.
  • ETH 1-3: Connect local network devices here.
  • SIM Slot: Located on the bottom of the unit.

Model compatibility

  • Supports LANCOM AirLancer antennas for 4G/3G.
  • USB port supports USB printers, serial devices, or USB drives (FAT file system).

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Manual page author

Emily Carter

User documentation editor

Prepares concise manual descriptions and highlights the most useful setup, operation, and maintenance information for readers.