H3C S5500V2-28F-SI交换机 LS-5500V2-28F-SI(24个100/1000Base-X千兆SFP口,8个Combo 10/100/1000Base-T自适应以太网端口(与后8个SFP口Combo),2个千兆SFP口,2个万兆SFP+口)