Additional Port Activation enables upgrade in 8-port increments from 16 to 24, and 24 to 32 ports. The base 200532B Express model activates the first sixteen ports (0 to 15). You may optionally purchase port activation for ports sixteen to twenty-three (first eight-port increment), and ports twenty-four to thirty-one (second eight-port increment). Includes 8 4 Gbps shortwave SFP transceivers