Milesight UF31 5G Dongle

Milesight UF31 5G Dongle (UF31-554AE)

The Milesight UF31 is a compact 5G dongle providing global 5G NSA/SA, 4G LTE, and WCDMA connectivity for industrial and commercial deployments. It delivers download speeds of up to 2.5 Gbps via a Gigabit Ethernet port or USB 3.0 Type-C output, and supports SIM cards from network operators across most countries worldwide. The UF31 covers the widest 5G Sub-6 GHz band set in its class, including N1, N3, N5, N7, N8, N20, N28, N38, N40, N41, N77, N78, and N79.

A quad-core ARM Cortex-A55 processor running at 2 GHz and 1 GB LPDDR4X RAM give the UF31 the headroom to run OpenVPN and IPsec tunnels, an iptables firewall, DHCP server, and Milesight DeviceHub management simultaneously. Built-in GPS/GLONASS/Beidou/Galileo/QZSS with a dedicated SMA antenna port adds GNSS location capability without additional hardware. The metal enclosure measures 90 x 72 x 15 mm and supports desktop, wall mount, and DIN rail installation.

Key Features

• Global 5G Sub-6 GHz SA/NSA with 4G LTE and WCDMA fallback – up to 2.5 Gbps download
• 5G NR bands: N1/N3/N5/N7/N8/N20/N28/N38/N40/N41/N77/N78/N79
• LTE FDD: B1/B3/B5/B7/B8/B18/B19/B20/B28/B32 | LTE TDD: B38/B40/B41/B42/B43/B46
• 1 × Gigabit Ethernet LAN port and 1 × USB 3.0 Type-C for host connectivity or power input
• Quad-core ARM Cortex-A55 2 GHz CPU with 1 GB LPDDR4X RAM and 1 GB NAND Flash
• Built-in GPS/GLONASS/Beidou/Galileo/QZSS – dedicated SMA antenna connector
• OpenVPN (up to 3 clients + server) and IPsec (up to 3 clients + server) VPN support
• Iptables firewall with ACL, port mapping (DNAT), DMZ, and SYN-flood protection
• 1 × Micro SIM slot (3FF) with manual band locking for network optimisation
• Hardware watchdog for automatic recovery from cellular or system faults
• Power via 5-24 VDC terminal block or 5V/3A USB Type-C; typical draw 3.9 W
• Operating temperature -20°C to +50°C; IP30 metal enclosure; wall and DIN rail mounting
• Web GUI, CLI, and Milesight DeviceHub cloud management

Applications

Industrial Automation and Machine Connectivity

The UF31 connects CNC machines, PLCs, and SCADA systems to 5G networks via Ethernet, replacing wired broadband where cabling is impractical. Its compact form factor suits embedded installation inside control cabinets. Band locking lets engineers pin the device to a specific 5G NR band for consistent throughput.

Video Surveillance Backhaul

IP cameras and NVRs with Gigabit Ethernet ports connect directly to the UF31 LAN port for cellular uplink. The iptables firewall and port mapping rules control inbound access to camera streams. A fixed IP SIM card enables persistent remote viewing without a VPN.

Mobile and Vehicle-Mounted Connectivity

The UF31 runs from a 5-24 VDC vehicle power supply without additional regulation. The built-in GNSS receiver tracks vehicle position and forwards NMEA data to a server via the GPS IP forwarding feature. This suits fleet telematics, dashcam uplink, and mobile work platforms.

Smart Office and Digital Media

The UF31 provides a 5G uplink for digital signage players, conference room screens, and kiosk terminals where structured Ethernet cabling is unavailable. USB 3.0 Type-C output connects directly to host devices without a separate Ethernet adapter.

Temporary and Pop-Up Site Connectivity

The UF31 delivers fast 5G internet to construction sites, event venues, and temporary office locations. Its sub-20 mm profile and low 3.9 W power draw suit battery or solar power installations. See our temporary site connectivity service for short-term SIM rental options.

Robotics and Embedded Systems

The UF31 mounts directly inside robot enclosures and autonomous vehicles. USB Type-C provides both power and data to the host computing board. The hardware watchdog and ping detection ensure the cellular link recovers automatically from faults without operator intervention.

Frequently Asked Questions

What is the difference between the Milesight UF31 and a standard 4G router?

The UF31 is a 5G dongle rather than a full router. It provides a single Gigabit Ethernet LAN output and a USB 3.0 Type-C port for host connectivity. It does not have multiple LAN ports or Wi-Fi. It is intended for embedded installation inside equipment or for direct point-to-point connectivity between a single host device and the 5G network. For multi-port and Wi-Fi applications, consider the Milesight UR75 5G router or the Teltonika 5G router range.

Does the UF31 support VPN, and what types?

Yes. The UF31 supports both OpenVPN and IPsec VPN. It can run up to three simultaneous OpenVPN clients plus an OpenVPN server, and up to three IPsec clients plus an IPsec server. Configuration is via file import (OVPN format) or through the web GUI. For background on VPN use with cellular devices, see our guide to VPN on cellular routers.

What SIM card does the Milesight UF31 need?

The UF31 uses a standard Micro SIM (3FF format). For most UK industrial deployments requiring remote access or CCTV backhaul, a fixed IP SIM card is recommended so the device has a persistent, addressable IP address. For deployments requiring international roaming, see our roaming SIM cards. Contact our team for SIM advice specific to your application.

What 5G bands does the UF31 support, and is it compatible with UK 5G networks?

The UF31 covers 5G NR bands N1, N3, N5, N7, N8, N20, N28, N38, N40, N41, N77, N78, and N79. UK operators use primarily N1, N3, N7, N20, N28, N77, and N78, all of which the UF31 supports. The device also includes full LTE band coverage for 4G fallback on all major UK operators. Band locking is available in the web GUI to pin the modem to specific bands for speed or coverage optimisation.

Can the UF31 be powered by USB?

Yes. The UF31 accepts power via the USB Type-C port at 5V/3A, in addition to the 2-pin 3.5 mm terminal block accepting 5-24 VDC. Both inputs include surge protection and reverse polarity protection on the DC input. Typical power consumption is 3.9 W.

What is Milesight DeviceHub and does the UF31 support it?

DeviceHub is Milesight’s cloud-based remote management platform. It provides centralised monitoring, bulk configuration, and firmware management for fleets of UF31 devices. The UF31 connects to DeviceHub by account name or authentication code from the System menu in the web GUI.

Related Products and Further Reading

The UF31 works alongside a Milesight-compatible IoT SIM card for 5G connectivity in the UK. For deployments needing Wi-Fi or multiple LAN ports, the Teltonika 5G router range provides a broader feature set. External 5G antennas improve signal in shielded enclosures – see our 5G antenna range for options compatible with the UF31’s SMA connectors. For applications requiring VPN tunnels, read our guide to VPN on cellular routers.