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QSFP28 optical modules are one of the latest developments in high-speed networking. These quad small form-factor pluggable transceivers combine four transmit and four receive channels (each rated for data rates up to 28 Gbps), giving you a total bandwidth of 100 Gbps. QSFP28 modules are high-density optical transceivers ideal for data communications systems (100 Gigabit Ethernet). The “28” in QSFP28 stands for the 25 Gbps to 28 Gbps per lane electrical interfaces. Such modules convert electrical signals to optical signals and vice versa to enable ultra-fast data transmission over fiber optic cables. The following figure provides a quick comparison of different types of QSFP28 modules . Read More:- https://www.cbo-it.de/shop/was-sie-bei-der-auswahl-des-100g-qsfp28-optikmoduls-fuer-ihr-netzwerk-beachten-sollten