ANSI/TIA-568.1-E organizes commercial cabling into a hierarchical structure consisting of six main elements:
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Covers the cabling from the telecommunications outlet in the work area to the horizontal cross-connect in the TR. ANSI/TIA-568
The “E” revision formally acknowledged that while horizontal cabling (from the closet to the desk) still had a maximum distance of 90 meters of solid copper, the backbone—the spine of the building—could now be a hybrid of fiber and copper, with updated distance limits that made older specs obsolete. ansi tia-568.1-e pdf