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Black rectangular adapter with USB-C port, RJ45 jack and dual SIM slots

Fervit

Fervit NGFF M.2 4G/5G to USB-C Adapter Dual SIM RJ45 PoE RTL8125BG Black

SKU CH-B8JB-ZW4VT

Connects 3042/3052 4G/5G modules via USB-C with dual SIM slots and 2.5 Gbps RJ45 PoE using RTL8125BG

  • Connect 4G or 5G modules via USB-C
  • Dual SIM slots support Micro and Nano cards
  • 5 Gbps Ethernet with auto-negotiation to 1 Gbps
  • PoE module powers the adapter over Ethernet
  • Fits 3042 and 3052 M.2 module sizes

Purpose-built bridge

This adapter converts a 3042 or 3052 M.2 4G/5G module into a USB-C peripheral with dual SIM slots and a 2.5 Gbps RJ45 port. It targets integrators and mobile professionals who need wired Ethernet and cellular fail-over in a single compact device.

Build integration

The board draws power and data over USB-C while the PoE module can supply upstream equipment, reducing the need for separate injectors. Dual SIM support via AT command lets the host switch carriers without physical access, and the Realtek RTL8125BG controller handles 2.5 Gbps, 1 Gbps and 100 Mbps negotiation automatically.

Sustained operation

The Ethernet controller maintains backwards-compatible link speeds during prolonged transfers, avoiding renegotiation drops when network conditions shift. Thermal load stays within the adapter’s passive envelope because the RTL8125BG is designed for continuous 2.5 Gbps throughput without active cooling.

Highlights

  • Connect 4G or 5G modules via USB-C
  • Dual SIM slots support Micro and Nano cards
  • 5 Gbps Ethernet with auto-negotiation to 1 Gbps
  • PoE module powers the adapter over Ethernet
  • Fits 3042 and 3052 M.2 module sizes

Specifications

BrandFervit

Questions about this item

What is the maximum sustained Ethernet speed the Realtek RTL8125BG controller can maintain?

The 2.5 Gbps Ethernet port negotiates automatically between 2.5 Gbps, 1 Gbps and 100 Mbps connections for stable throughput.

How much heat or noise does the adapter produce when running continuously?

The adapter has no fan and draws power from the USB-C bus, so it runs silently with minimal heat during all-day use.

Which M.2 module sizes and SIM formats must I already have for this adapter to work?

You need a 3042 or 3052 type 4G/5G module plus standard, Micro or Nano SIM cards; dual-SIM operation is handled by AT commands.

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