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The QSFP can be used as a fiber optic solution with speed and density superior to the 4-channel CX4 interface. Since four channels of data can be supported at 10Gbps per channel at the same port volume of the XFP, the density of the QSFP can be 4 times that of the XFP product and 3 times that of the SFP+ product. The QSFP interface with 4 channels and higher density than the CX4 has been adopted by the InfiniBand standard.
The picture of QSFP Cable Wire and Connector:
The pin definition of the QSFP interface plug defined in the Infiniband(tm) specification is shown in the following figure:
The correspondence between QSFP socket pins and interface plug pins defined in the infiniband specification is shown in the following figure:
QSFP socket interface logic circuit design reference:
1. Switch, router, host adapter bus
2. Enterprise storage
3. High-density, high-speed I/O
4. Multi-channel interconnection