SFP+ Cages Stewart Connector SFP+ Cages are single and multiport devices designed to meet the requirements of small form factor industry standards. Stewart Connector SFP+ Cages support the growing demand for I/O solutions in fiber channels and Ethernet applications in which improved performance is necessary with increasing data rates. These SFP+ cages support 8Gbps Fibre Channels and 10Gbps Ethernet.