TP-Link 10/100 Mbps WDM Media Converter

The TP-Link TL-FC111A-20 is a 100M WDM media converter that provides one 10/100 Mbps RJ-45 copper port and one 100M SC single-mode fiber port. It converts electrical Ethernet signals to optical signals and back, enabling long-distance data transmission over single-mode fiber up to 20 km. The compact black unit supports standard IEEE Ethernet rates and includes LED indicators for link, activity and power for simple monitoring.

Advantages

Using wavelength division multiplexing (WDM), the TL-FC111A-20 transmits on 1550 nm and receives on 1310 nm, allowing bidirectional traffic over a single fiber and reducing fiber cabling needs. The converter can operate as a standalone desktop device or be mounted in TP-Link’s TL-FC1420 rack for centralized installation. Auto MDI/MDI-X negotiation is supported on the TX (copper) port for straightforward connection to switches or hosts.

Suitable for

• Long-distance Ethernet extension between buildings or across a campus
• Park and perimeter security camera networks
• Wireless backhaul where fiber is available but fiber count is limited
• Small office or branch links requiring single-mode fiber connectivity

Key specifications

• Maximum data transfer rate: 100 Mbit/s
• Ethernet LAN (RJ-45) ports: 1 (10/100 Mbps)
• Fiber ports quantity: 1 (SC connector, single-mode)
• Maximum transfer distance: 20,000 m (20 km)
• Wavelengths: transmit 1550 nm / receive 1310 nm (WDM)
• Power: 5 V DC, 0.6 A
• Colour: Black

How to use

Connect the RJ-45 copper port to your Ethernet switch, router or device and connect the SC single-mode fiber to the fiber span. Ensure the paired converter at the remote end uses the complementary wavelengths (transmit 1310 nm / receive 1550 nm). Power the unit with the supplied 5 V DC adapter and verify LEDs for power, link and activity to confirm operation. For rack installation, place units in the TL-FC1420 chassis following the rack instructions.

Recommendations

Install in dry, ventilated locations and use single-mode SC fiber of appropriate quality. Verify fiber polarity and use the TL-FC111A-20 in matched pairs with complementary wavelengths for correct bidirectional communication over a single fiber.