This document will focus on QSFP, QSFP+ and QSFP28.
Though they look very similar in physical appearance but the transmit data
rates are quite different.
QSFP+ and QSFP28 transceivers look very similar because they all share the same
small form-factor. The QSFP has evolved to QSFP+ to meet 10 Gbps data
rates. The standard is the SFF-8436. Further demand for higher data
rates led to introduction of QSFP28 which supports up to 100 Gbps of
stands for Quad Small Form Factor Pluggable.
available for use in both singlemode and multimode and can support 4
independent channels that can individually transmit at up to 1.25 Gbps per
channel for an total speed of above 4 Gbps.