content: What do you think they use to build the internet? Did you notice the distance specs for one of the modules in the article?:  The 400-Gbps modules provide reaches of 2 km (QSFP-DD FR8) and 10 km (QSFP-DD LR8) using eight 50-Gbps lanes with PAM4 modulation.  Who the fuck needs those distances for a LAN?