Sometimes I use these terms loosely. Here an article that explain the 3 fiber optic transceivers QSFP, QSFP+ and QSFP28
Taken from the article “Difference between QSFP, QSFP+, QSFP28“
Here are some main points
- The QSFP specification supports Ethernet, Fibre Channel, InfiniBand and SONET/SDH standards with different data rate options.
- QSFP transceivers support the network link over singlemode or multimode fiber patch cable.
- Common ones are 4x10G QSFP+, 4x28G QSFP28
- QSFP+ are designed to support 40G Ethernet, Serial Attached SCSI, QDR (40G) and FDR (56G) Infiniband, and other communication standards
- QSFP+ modules integrate 4 transmit and 4 receive channels plus sideband signals. Then QSFP+ modules can break out into 4x10G lanes.
- QSFP28 is a hot-pluggable transceiver module designed for 100G data rate.
- QSFP28 integrates 4 transmit and 4 receiver channels. “28” means each lane carries up to 28G data rate.
- QSFP28 can do 4x25G breakout connection, 2x50G breakout, or 1x100G depending on the transceiver used.
- Usually QSFP28 modules can’t break out into 10G links. But it’s another case to insert a QSFP28 module into a QSFP+ port if switches support.
- QSFP+ and QSFP28 modules can support both short and long-haul transmission.