The S7706 chassis is 10 U high (1 U = 44. Figure 4-21 and. g switches designed for next-generation enterprise networks. The S7700 design is based on Huawei's intelligent multi-layer switching technology to provide intelligent service optimization methods, such as MPLS VPN, traffic analysis, comprehensive H-QoS policies, controllable multicast, load. ei S7706 Assembly Chassis. Agile features supported in V200R005C00 and later versions 3. Innovative Cluster Switching System (CSS) 4. Left-to-rear air flow, high-density wiringThe S7700 series is available in three models: S7703, S7706, and S7712.