QSFP28 denotes the 4 x (24…28) = 100 Gb/s product range with QSFP form factor, used for InfiniBand EDR 100Gb/s ports and 100Gb/s Ethernet (100GbE) ports. The QSFP28 interface is specified in SFF-8679.
CFP, short for C form-factor pluggable, is defined by CFP MSA and supports a single 100 Gbit/s signal like 100GbE or OTU4 or one or more 40 Gbit/s signals like 40GbE, OTU3, or STM-256/OC-768. However, as expected, improvements in technology have allowed higher performance and higher density. Hence the development of the CFP2 and CFP4 specifications. Cisco 100g cfp/100g cfp2 dwdm/coherent 100g cfp at the best online prices at heyoptics!