The QSFP28-ER-50G Module supports up to 40km link lengths over OS2 SMF via a LC duplex connector. The built-in digital diagnostics monitoring (DDM) allows access to real-time operating parameters via the I2C interface. When this type of optical module is used to interconnect with a WDM device, the 1+1 protection switching duration on the client side of the WDM device is longer than 50 ms. If the module needs to reach the nominal data, the board FEC function. When you perform a self-loop for a 50GBASE-ER 40 km optical module, an optical attenuator must be used. Note: The preview effect may be slightly different from the source document. This 02312AXF is 100% genuine Huawei product. It won't have any compatibility problem with your Huawei devices. And the Huawei High Speed Transceiver, QSFP28, 1311nm, 50Gb/s, 1. 5dBm, 8dBm, -15dBm, Straight LC, SMF, 40km is factory new with original packaging. Buy it now and enjoy risk free purchase. 50GBASE-ER QSFP28 PAM4 Transceiver Module (SMF, 1310nm, 40km, LC, DOM) SPECIFICATIO HeyOptics provides 50G QSFP28 ER PAM4 optical modules and other 50G transceivers in 50GBASE-LR (10km) and 50G BiDi QSFP28 (bidirectional 1271/1331nm) modules which designed for 5G mid-haul and back-haul. The FS® 50GBASE Quad Small Form-Factor Pluggable (QSFP28/SFP56) portfolio offers customers a wide variety of high-density and low-power 50 Gigabit Ethernet connectivity options for data center, high-performance computing networks, enterprise core and distribution layers, and service provider.