The Huawei CloudEngine S7700 Series is a top-tier Modular Core Switch platform—offering scalable throughput, PoE integration, secure VXLAN fabrics, MACsec, and wireless AC capabilities. The S7706 chassis is 10 U high (1 U = 44. The switching capacity and port density of all four models is expandable. Key components. Huawei's S7706 Assembly Chassis offers a robust and scalable network solution designed for high-performance enterprises. With chassis options like the S7703, S7706, and S7712, this series delivers flexible port expansion, PoE support, advanced virtualization, MACsec security, and intelligent. S7700 series switches (S7700 for short) are high-end smart routing switches designed for next-generation enterprise networks.