Newnex FireNEX-U4F20G USB4 Fiber Repeater | 20Gbps Aggregate • 2× USB-A 10Gbps • 700m (5Gbps) / 300m (10Gbps) • OS2 Duplex LC

Newnex FireNEX™-U4F20G is a high-performance USB fiber optic repeater built for long-distance USB connectivity in environments where copper cables fail fast or fail loudly (EMI, ground noise, distance limits, all the classics).

For host systems equipped with a USB4 or Thunderbolt USB-C port, the Local Unit transmits USB over EMI-free single-mode fiber to a Remote Unit that provides two USB 3.2 Gen 2 Type-A (10Gbps) ports for device connectivity. The system supports up to 20Gbps aggregate bandwidth across the fiber link.

Distance depends on USB speed (important)

FireNEX-U4F20G is optimized for two common high-speed USB tiers, and the maximum distance changes depending on which one your device negotiates:

• USB 3.2 Gen 1 (5Gbps): up to 700 meters
• USB 3.2 Gen 2 (10Gbps): up to 300 meters

That means you can push significantly farther for 5Gbps-class devices, while still achieving true long-run performance for 10Gbps devices.

Host stability and compatibility

The upstream USB-C port on the Local Unit supports hot-plug operation, designed to help avoid host reboots if the fiber link is disconnected or if the Remote Unit loses power.

The system uses native USB drivers and works with Windows, macOS, and Linux. It remains backward compatible with USB 3.0 and USB 2.0/1.1 devices, while requiring a USB4 or Thunderbolt host for the upstream connection.