With the EX4200, you have the option of a 24 port (24T), or a 48 port (48T) switch. To get 2x20Ports, you could either get the single 48 port switch, or you could get two 24 port switches and dual home them to the core. The internal switching capacity is 88Gbps for the 24, and 128Gbps for 48 port switch.