TP-LINK (TL-SM321B-2) 1000Base-BX WDM Bi-Directional SFP Module Up to 2km DDM Hot Swappable 1000Base-BX WDM Bi-Directional SFP Module Adopts the latest standard 1000Base-BX Up to 2 km transmission distance in 9/125 μm SMF (Single-Mode Fiber) Compatible with Small Form Pluggable Multi-Source Agreement (SFP-MSA) Supports Digital Diagnostic Monitoring (DDM) Supports Hot Swappable What This Product Does TP-LINK´s TL-SM321B-2 is developed in accordance with the Small Form Pluggable Multi-Source Agreement (SFP-MSA). As a WDM Bi-Directional optical transceiver, TL-SM321B-2 uses an integrated LC Bi-Directional optical interface connector and the data link is up to 2 km in 9/125 μm SMF (Single-Mode Fiber). Also, TL-SM321B-2 incorporates the Digital Diagnostic Monitoring (DDM) feature which is compatible with SFF-8472. DDM supports real-time monitoring of the transceiver, and shows parameters including the transceiver current which transmits/receives optical power and operating temperature. TP-Links TL-SM321B-2 is used for short-and medium distance fiber network in practice, and it provides fast and stable gigabit fiber connection for switches, routers, servers, et Specification Device Type: Bi-Directional SFP Module Standards and Protocols: \"\"IEEE 802.3z, TCP/IP\"\" Cable: Single-mode Fiber Fiber Type: 9/125 um Single-Mode Data Rate: 1.25 Gbps Wave Length: Tx: 1310 nm Rx: 1550 nm Port Type: LC Simplex Power Supply: 3.3V Environment (): \"\"Operating Temperature: 0–70 °C (32–158 °F) Storage Temperature: -40–85 °C ( -40–185 °F) Operating Humidity: 10–90 RH, Non-Condensing Storage Humidity: 5–90 RH, Non-Condensing\"\" Package Type: Retail Package Weight: 0.0610 kg Warranty: 2 Years