A single Flex Stack connection between two members is a full duplex 10 Gbps connecton. Each Cisco Catalyst 2960-S member supports two Flex Stack connections. Each Flex Stack member can simultaneously send & receive Ethernet traffic over both stack links at line rate, effectively giving 20 Gbps of stack bandwidth per member. Up to four switches can stacked together using Flex Stack to form a single logical switch. Logical switch is another term used to identify a stack of switches.