The MikroTik S-3553LC20D is a professional solution consisting of a pair of 1.25G SFP transceiver modules designed for long-distance fiber optic connections. Manufactured for use with single-mode fiber cables, this set offers high performance and reliability for connections up to 20 kilometers. It serves as an effective connection bridge in data center connections, campus networks, or metropolitan infrastructure projects where copper cabling is insufficient. With an LC type connector, it is directly compatible with commonly used fiber infrastructure. The technical strengths of this product include a wide operating temperature range and DDM (Digital Diagnostic Monitoring) support. Its ability to operate stably even in harsh environmental conditions from -40°C to +70°C provides confidence in both indoor and outdoor installations. Thanks to the DDM feature, critical parameters such as optical power level, temperature, and voltage can be monitored in real time, enabling early detection of potential issues and proactive network management. Additionally, one module in the set operates at 1310nm/1550nm and the other at 1550nm/1310nm wavelengths, providing an ideal match for full-duplex communication. The MikroTik S-3553LC20D has been tested and is compatible with many MikroTik devices such as RB260GS, RB2011 series, and CCR1036-12G-4S. It also works seamlessly with other brand switches and routers that have standard SFP ports. This feature allows flexible integration into your existing network infrastructure. The product is an ideal choice for network administrators or system integrators who want to create a high-speed, low-latency, and reliable fiber backbone between two different devices. It delivers strong performance in applications requiring high bandwidth, such as inter-site connections, in-building fiber distribution, or security camera systems. Technical Specifications: - Product Code: S-3553LC20D - Product Type: SFP Transceiver Pair - Data Rate: 1.25 Gbps - Maximum Distance: 20 km - Fiber Type: Single Mode (SM) - Connector Type: LC UPC - Operating Temperature: -40°C to +70°C - Wavelength (S-35LC20D): Transmit 1310nm / Receive 1550nm - Wavelength (S-53LC20D): Transmit 1550nm / Receive 1310nm - Feature: DDM (Digital Diagnostic Monitoring) Support - Form Factor: SFP - Compatibility: MikroTik and other SFP devices