QSFP stands for quad small form-factor pluggable, and it is an evolution of SFP, which stands for small form-factor pluggable. In terms of usability and functionality, QSFP transceivers are very similar to SFP transceivers in most ways. Just like SFP transceivers, QSFP optics are hot-pluggable fiber optical transceivers and they support many of the same communication standards including Fibre Channels, SONET, and Ethernet.
However, the big difference between QSFP and SFP is the quad form of QSFP transceivers. This quad form factor of QSFP allows for different data rate options. By using four transmission and reception channels, QSFP transceivers can get speeds up to 40 Gigabit Ethernet (40GbE). While QSFP optics may have a higher price point, the significant difference in bandwidth capabilities may allow network operators to save costs while upgrading data throughput. As QSFP optics serve as the pathways to 40G and beyond, they are dependable solutions for site-to-site interconnects and high bandwidth applications in data centers and server farms.
In order to achieve 40G connections and beyond, QSFP transceivers can play an efficient, yet powerful role in building future-proof network infrastructures.