The MikroTik S-4554LC80D is a professional solution consisting of a pair of SFP modules designed for long-distance fiber optic connections. This set is developed to reliably establish point-to-point connections up to 80 kilometers. Operating in an industrial temperature range, this module pair delivers stable performance even in harsh environmental conditions, making it ideal for infrastructure projects such as inter-city connections, campus networks, or remote data center links. The technical strengths of this product are high durability and advanced monitoring features. The wide operating temperature range from -40°C to +85°C makes the product suitable for use in both cold climates and hot industrial environments. Thanks to the DDM (Digital Diagnostic Monitoring) feature, critical parameters such as optical power, temperature, and voltage can be monitored remotely in real time, enabling early detection of potential issues and preventing network outages. Additionally, the bidirectional (BiDi) modules operating at 1490nm and 1550nm wavelengths allow data exchange over a single fiber, reducing fiber infrastructure costs. The MikroTik S-4554LC80D is fully compatible with all MikroTik routers and switches that have SFP or SFP+ cages. This module pair is an excellent choice for network administrators and system integrators who want to connect two distant buildings, campuses, or city centers with high bandwidth and low latency. With its long range, single fiber requirement, and robust construction, it stands out as a reliable backbone connection component for telecom operators, internet service providers, and enterprise networks. Technical Specifications: - Product Code: S-4554LC80D - Connection Format: SFP - Data Rate: 1.25G - Maximum Distance: 80 km - Fiber Mode: Single Mode (SM) - Connector Type: LC - Operating Temperature: -40°C to +85°C - Wavelength: 1490nm/1550nm (BiDi) - Contents: Pair of S-45LC80D and S-54LC80D - Compatibility: MikroTik products with SFP/SFP+ cages - Monitoring: DDM (Digital Diagnostic Monitoring)