The maximum permissible optical power attenuation between OLT optical ports to ONT input is 28dB, which is by utilizing the so-called Class B optical network elements. 5GE, FE, and GE optical modules. Optical modules are encapsulated in different modes to provide different. The S-Class Cisco 40GBASE-SR4-S QSFP module supports link lengths of 100 and 150 meters, respectively, on laser-optimized OM3, and OM4/OM5 multimode fibers. QSFP-40G-SR4-S is aligned to IEEE 40GBASE-SR4 optical specifications which support high-bandwidth 40G optical links over 12-fiber parallel. To meet the demands of various transmission rates, different-rate optical modules have emerged: 1. 6T optical modules, 800GE optical modules, 400GE optical modules, 100GE optical modules, 40GE optical modules, 25GE optical modules, 10GE optical modules, GE optical modules, FE optical modules, and so. The High-Speed Network Communications Module (HS-NCM) pro-vides NOTIFIER®'s N16, NFS-320, NFS-640, NFS2-640, NFS-3030, and NFS2-3030 Fire Alarm Control Panels, NCD, NCA, and NCA-2 Network Control Displays and Annunciators, and DVC Digital Voice Command with a means to connect to High-Speed. A single mode SFP transceiver is an optical module that uses laser-based transmission over single mode fiber to deliver long-distance, high-speed data communication, typically at 1310nm or 1550nm wavelengths. To ensure maximum quality, Extreme selects and tests the most reliable, highest-performing optical transceivers on the market, and then warrants their availabil iability testing reflects an ongoing commitment to quality.