- Designed for on-site gigabit fiber communication - Up to 2 km transmission distance with 9/125 μm SMF (Single-Mode Fiber) - Bidirectional WDM communication on a single fiber - Compatible with Small Form Pluggable Multi-Source Agreement (SFP-MSA) - Supports Digital Diagnostic Monitoring (DDM) - Hot-swappable module design - Work with TL-SM321B-2 as a pair