“QSFP 100G SM SR” is Cisco’s part number QSFP-100G-SM-SR: a 100G QSFP28 transceiver for duplex single-mode fiber that reaches up to 2 km. It is technically a “Lite” version of 100G CWDM4. The name looks contradictory, because standard 100GBASE-SR4 runs over multimode fiber, but here “SM” means single-mode and “SR” means short reach compared with […]