The definitive guide to the QSFP optical module series (40G, 100G, 400G, 800G). Learn the technical differences, evolution path, and optimal selection criteria for QSFP+, QSFP28, QSFP-DD, and OSFP transceivers. QSFP (Quad Small Form-Factor Pluggable) optical modules emerged to meet this demand, becoming a pivotal technology for data center interconnects due to their compact size and exceptional performance. From the initial 40G to today's 800G, the QSFP family has continuously evolved, driving the. This QSFP module guide breaks down the technical specifications, practical deployment scenarios, and decision-making factors to help network engineers select and optimize these transceivers effectively. Comprising five flagship platforms, Centenario, Jesko, Portofino, Gemera, and Cygnus, Broadcom's DSP PAM-4 portfolio covers 100G, 400G, 800G, and 1. 6T PMDs. ules needs to be measured for selecting acceptable modules. However, it is difficult to predict the level of radiation in a fully implemented system because different vendors and users have differe t test methods to quantify the radiation levels of modules. While their switching platform and target speeds were correct, they overlooked a key detail: connector type.