Difference between QSFP, QSFP+ and QSFP28

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, 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 upto 100 Gbps of speed.


 

QSFP –

Abbreviation stands for Quad Small Form Factor Pluggable.

QSFP is available for use in both singlemode and multimode and can to support 4 independent channels that can individually transmit at up to 1.25 Gbps per channel for an total speed of above 4 Gbps.

 

QSFP+

Abbreviation stands for Quad Small Form Factor Pluggable Plus.

QSFP+ supports Ethernet, Fibre Channel and Infiniband at 10Gbp/s per channel up to a maximum of 4 channels for a total speed of 40Gbp/s.

 

QSFP28 –

QSFP28 combines speeds of 28Gbps per channel for a total speed of 100Gbps. The QSFP28 interface is highly flexible and can be used in the following combinations.

  • 100 Gbps
  • 2 X 50 Gbps
  • 4 X 25 Gbps

The comparison between 3 flavors is shared below –

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