What is the maximum data transfer speed this media converter can support over its 20 km range?

The media converter supports a maximum data transfer speed of 10/100 Mbps.

Questions & Answers: TP-Link TL-FC111B-20 | 10/100 Mbps WDM SFP to RJ45 Fiber Media Converter | Fiber to Ethernet Converter | 10/100 Mbps RJ45 Port to 100Base-FX Single-Mode Fiber | Extend Fiber Distance Up to 20 km

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TP-Link TL-FC111B-20 | 10/100 Mbps WDM SFP to RJ45 Fiber Media Converter | Fiber to Ethernet Converter | 10/100 Mbps RJ45 Port to 100Base-FX Single-Mode Fiber | Extend Fiber Distance Up to 20 km

Designed to convert 100BASE-FX SC fiber to 100Base-Tx copper media or vice versa
Auto-negotiation of Half-Duplex/Full-Duplex transfer mode
Supports auto MDI/MDIX for TX port
TL-FC111B-20 adopts WDM (wavelength division multiplexing) technology, helping send and receive data at a distance up to 20 km with only one single-mode fiber, which saves half of the cable deployment cost for customers compares to dual-fiber deployment.
Wavelength: Tx 1310 nm, Rx 1550nm; Compatible TP-Link model: TL-FC111A-20

$360^.99 –