The maximum data rate for a QSFP (Quad Small Form-factor Pluggable) module is 40 gigabits per second (Gbps) for QSFP+ and 100 Gbps for QSFP28.

The 40G QSFP+ PSM is a high-performance, low-power, long-duration interconnect solution supporting 40G Ethernet, Fibre Channel, and PCIe, with a look-and-feel, optical/electrical connectivity, and digital diagnostic interfaces designed primarily based on the QSFP+ multi-source protocol.

It benefits as a highly integrated 4-channel optical module with the advantage of higher port density, and also saves a lot of cost for the whole system operation. The optical port adopts PSM (Parallel Single Mode) Parallel Single Mode technology with 8 single mode fibers, and achieves an effective transmission of 10km by using a 4-channel parallel design MPO/MTP interface.

It is a combination of four full-duplex channels, each capable of transmitting up to 10Gb/s of data, providing an aggregated rate of 40Gb/s. The 40G LR4 PSM Optical Module operates on the same principle as the 40G SR4 QSFP+ Optical Module, which is based on the conversion of electrical signals to optical signals by an array of lasers, and then converted into optical signals by an array of photodetectors. electrical signals by the photodetector array. The difference is that 40G LR4 PSM optical modules are commonly connected to single-mode ribbon fibers, which means that the parallel optical signals are sent in parallel through eight single-mode fibers.