Allied Telesis x530 Series - Figure 23: Trunks of 5 Gbps Ports for Stacks of Three Switches

x530 Series Installation Guide for Virtual Chassis Stacking
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A trunk of 5Gbps Multi-speed ports for a stack of three or more switches
can have two or four ports per switch. Refer to Figure 23.
Figure 23. Trunks of 5Gbps Ports for Stacks of Three Switches