TIA-942 maps a data center's cabling into six functional areas (ER, MDA, HDA, EDA, IDA, and ZDA) so that moves, adds, and changes happen with less risk and higher uptime. That structured approach is the foundation for reliable connectivity and clean cable pathways in any facility. LAN/SAN switches are located within the EDA cabinet or rack. When done right, structured cable design allows data centers. Ever tried explaining core, distribution, and access network layers to someone who isn't a network engineer? Blank stares, right? I've been there—watching eyes glaze over as I describe the backbone of every functioning enterprise network. But here's the thing: understanding these three-layer.