40GBASE-LR4 CWDM and PSM QSFP+ Transceiver Links
There are 40GBASE-SR4 QSFP+ transceivers and 40GBASE-LR4 QSFP+ transceivers. It's known that 40GBASE-SR4 uses a parallel multimode fiber (MMF) link to achieve 40 G. It offers 4 independent transmit and receive channels, each capable of 10 G operation for an aggregate data rate of 40G over 100 meters of OM3 MMF or 150 meters of OM4 MMF. While for 40GBASE-LR4 QSFP+ transceivers, there are two kinds of links. One is coarse wavelength division multiplexing and the other is parallel single-mode fiber. What's the difference?
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