The enterprise office networking environment is considerably intricate, encompassing a wide range of business transactions and distinct network strategies for each business segment. Moreover, there is a diverse array of terminal devices, including large displays, printers, telephones, and cameras, among others. It is imperative to guarantee that all terminal types can concurrently receive power and transmit data. QSFPTEK employs a 3-Tier architecture, capable of supporting multiple network types and offering flexible network expansion. To accommodate the increased load demands of the core layer, S7600-32C 100G switches are utilized, featuring Multi-Chassis Link Aggregation (MLAG) for bandwidth expansion and redundancy. This highly efficient system facilitates prompt upgrades and provides isolation in the event of a malfunction, ensuring secure data transmission. The aggregation layer utilizes the L3+ S7300-24X2C switch, which supports iStack and 40G/100G uplink capabilities. Access layer devices are equipped with PoE+ and iStack support, enabling connection and power supply for a large number of terminal devices.