Dorelink
Dorelink
While Finland is a global leader in 5G deployment, the underlying Synchronous Digital Hierarchy (SDH) and SONET infrastructures remain critical for utility grids, railways, and maritime communications. The 155M (STM-1) and 622M (STM-4) SFP modules serve as the vital link between legacy reliability and modern high-speed backbones.
Unlike standard modules, transceivers deployed in Finnish outdoor cabinets (from Lapland to Helsinki) must withstand extreme temperature fluctuations. Our industrial-grade 155M SFP modules are tested for -40°C to +85°C operation, ensuring zero packet loss during harsh Nordic winters.
In the global market, the demand for 155M/622M SFP modules has shifted from mainstream telecom to highly specialized industrial niches. These modules are now primarily used in SCADA systems, power line protection, and oil & gas pipeline monitoring where low-latency stability is preferred over raw throughput.
Dorelink’s R&D focus for the 155M/622M series is not just on legacy support, but on Information Gain through Digital Diagnostics (DDM). Our latest modules offer enhanced real-time monitoring of optical power, temperature, and voltage, allowing Finnish system integrators to predict failures before they occur in remote locations.
Ensuring E-E-A-T (Experience, Expertise, Authoritativeness, and Trustworthiness) in every fiber
Dorelink Optical Communications Co., Ltd., established in 2016, represents the pinnacle of optical module engineering. With over 12 years of industry experience, we have mastered the nuances of transceiver compatibility. Our facility in China, spanning 18,500㎡, mirrors the rigorous standards expected by Finnish manufacturers. Every 155M/622M SFP module undergoes a multi-stage validation process, including Incoming Material Inspection (IQC), Process Quality Control (IPQC), and Final Reliability Testing with high-temperature aging.
Our quality control team consists of 45 professionals dedicated to ensuring that every module shipped to Finland meets CE, RoHS, and FCC standards. We understand the high cost of technician dispatch in Finland; therefore, our MTBF (Mean Time Between Failures) is among the highest in the industry, minimizing the need for on-site maintenance in remote Finnish territories.
A: Yes, our modules are programmed with vendor-specific firmware to ensure 100% compatibility with Nokia, Ericsson, Cisco, Hirschmann, and Moxa equipment used extensively in Finland. We offer customized EEPROM coding for seamless integration.
A: All our products comply with the EU’s RoHS and WEEE directives. We provide full documentation for environmental compliance and CE certification required for Finnish industrial and governmental tenders.
A: Absolutely. We manufacture 155M SFP modules with reaches of up to 80km and 120km on single-mode fiber (SMF), specifically designed for long-haul connectivity in sparsely populated regions.
A: Yes, with a team of 120 engineers, we offer full OEM/ODM services including hardware modification, custom firmware, and private labeling to meet your specific project requirements.
