The Finisar FTLF1321P1BTL-HW is a high-performance, enhanced Small Form-factor Pluggable (eSFP) optical transceiver designed for SONET OC-48, SDH STM-16, and Gigabit Ethernet applications. This module operates at a nominal wavelength of 1310nm over single-mode fiber (SMF), supporting data rates up to 2.488 Gbit/s. It is specifically engineered for intermediate reach connectivity, enabling reliable data transmission over distances up to 2 kilometers. The "HW" designation indicates specific compatibility and optimization for Huawei networking hardware, ensuring seamless integration and telecommunication-grade reliability.The transceiver features a duplex LC optical interface and utilizes a high-stability laser transmitter. It supports Digital Diagnostic Monitoring (DDM), providing real-time access to critical operating parameters such as laser bias current, optical output power, received optical power, internal temperature, and supply voltage. Designed for industrial-grade environments, this module supports an extended operating temperature range, making it suitable for deployment in various outdoor and indoor cabinets. The hot-swappable eSFP form factor allows for non-disruptive installation and maintenance. The FTLF1321P1BTL-HW is compliant with the SFP Multi-Source Agreement (MSA), SONET/SDH standards, and meets Class 1 laser safety requirements.