Teltonika

Teltonika TRB256

Industrial NB-IoT Gateway

Black Teltonika TRB256 device with antenna connectors on a red background.

Teltonika TRB256 NB-IoT Gateway

The TRB256 is an industrial 4G LTE NB-IoT gateway designed to be applied to a broad range of IoT solutions. The device is equipped with multiple interfaces, such as I/Os, RS232, RS485, and an Ethernet port, additionally boasting dual SIM functionality for continuous connectivity. This industrial-grade gateway also supports the 450 MHz frequency band, offering superior LTE signal penetration compared to standard frequencies, making it an optimal choice for a diverse range of M2M applications.

Teltonika TRB256 NB-IoT Gateway Features

Millbeck are a Teltonika Diamond Distributor.

Connectivity

4G/LTE Cat M1/Cat NB1, NB2/EGPRS

450 MHz BAND

Greater LTE signal penetration and increased connectivity coverage

DUAL SIM

Auto-failover, backup WAN, and more switching scenarios

Interfaces

Ethernet, I/Os, and Serial (RS232, RS485) interfaces with 16-pin terminal block

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Vertical pattern of small gray dots on a white background, denser at the left fading towards the right.

Why Connect with Millbeck

Millbeck specialises in the cellular hardware and SIMs that sit between an industrial device and the network it depends on. The kind of work where the spec decisions made on day one decide whether the deployment is still online in year five.

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Featured case study

Cellular Connectivity for Smart Building Energy Monitoring

Resources

Latest news & insights

KB
Aug 12, 2026

Failover and Backup Connectivity

Failover connectivity uses a second network path, usually cellular, so operations keep running when the primary line fails. This guide covers automatic failover architectures, Teltonika's dual modem routers, and why the SIM behind the router matters as much as the hardware itself.

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News
Aug 4, 2026

Teltonika EOL Announcement for RUTX-Series

Teltonika has officially placed its entire RUTX router range into End of Life.

Teltonika RUTX Series Enters End of Life
Insights
Aug 4, 2026

Teltonika Dual Modem Routers for IoT

Why dual modem routers give IoT deployments real redundancy, and how Teltonika's RUTC42, RUTM56 and RUTM52 compare for 4G, 5G and edge use cases.

Image of a Teltonika RUTM56 dual modem router with the Millbeck logo above, on an abstract tiled background