https://www.glsunmall.com/fiber-optic-articles/40g-qsfp-optical-module-introduction.html As an upgrade version of the Quad Small Form-factor Pluggable (QSFP), QSFP+ is a compact, hot-pluggable optical module that can transmit data at up to 40Gbps. It conforms to the SFF-8436 protocol and the QSFP Multi-Source Agreement (MSA). QSFP+ has four independent optical signal sending and receiving channels with a rate of 10Gbps and a total bandwidth of 40Gbps. In the application scenarios of data center, high performance computing network, enterprise core layer and distribution layer, 40G QSFP+ optical transceiver module can provide high-density and low-power 40G Ethernet connection transmission applications. QSFP+ Interface Type The QSFP+ module can be inserted into all devices with QSFP+ interface (and some devices with QSFP28 interface) to realize 40G network connection. Generally speaking, there are two kinds of interfaces for 40G QSFP+ module: LC duplex interface and MTP/MPO interface (hereafter referred to as MTP), which have obvious differences in transmission distance, cable type and whether 4x10G transmission can be achieved. More information can be found in this article: 40G QSFP+MTP optical module and 40G QSFP+LC optical module comparison.