400g transceiver

What is the difference between 400G SR4.2 and 400G SR8

400GBASE-SR4.2 400GBASE-SR4.2, also called 400GBASE-BD4.2, is a 4-pair, 2-wavelength multimode solution that supports reaches of 70m (OM3), 100m (OM4), and 150m (OM5). It is not only the first instance of an IEEE 802.3 solution that employs both multiple pairs of fibers and multiple wavelengths, but also the first Ethernet standard to use two short wavelengths …

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What’s the difference between 400GBASE-LR8 and 400GBASE-LR4?

Both QSFP-DD and OSFP transceivers can transmit at 400Gbps using 8 lanes of 50Gbps PAM4 or 4 lanes at 100Gbps PAM4. But what’s the real difference behind 50Gbps PAM4 and 100Gbps PAM4? How do we achieve this transition? Pre-requirements Modulation For all optical transceivers transmitting up to 100Gbps, a NRZ mechanism (binary non-return to zero) …

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