https://www.fluxlight.com/content/Tech-Docs/Juniper%20JNP-QSFP-40G-LR4.pdf
The module converts 4 inputs channels of 10 Gbps electrical data to 4 CWDM optical signals, and multiplexes them into a single channel for 40Gbps optical transmission
It contains a duplex LC connector for the optical interface and a 148-pin connector for the electrical interface
