The TP-Link ISM321B-20 is an industrial-grade 1000Base-BX WDM bi-directional Small Form-factor Pluggable (SFP) transceiver designed to extend fiber optic network reach using a single strand of single-mode fiber. Utilizing WDM technology, this module transmits and receives signals simultaneously over different wavelengths (TX at 1310 nm, RX at 1550 nm), significantly reducing fiber infrastructure costs.

Key highlights include hot-pluggable design for maximum deployment flexibility, compliance with SFP-MSA standards, and Digital Diagnostic Monitoring (DDM) capability allowing real-time transceiver monitoring. Engineered for harsh environments, it supports an industrial operating temperature range from -40°C to 85°C.

The ISM321B-20 supports gigabit data rates of 1.25 Gbps compliant with IEEE 802.3z standards and can transmit data up to 20 km over single-mode fiber. It features a reliable LC/UPC connector type and operates on a 3.3V typical power supply. This compact, robust module is FCC and CE certified ensuring safety and emission compliance.

Ideal for industrial networking deployments requiring long-distance, cost-effective, and reliable fiber connectivity with environmental resilience.

Warranty: Comes with a limited 3-year warranty for peace of mind.