iiPowering on the switch·················································································································································· 30Maintenance and troubleshooting ···························································································································· 31Software loading failure ················································································································································ 31Power supply failure ······················································································································································ 31Fan failure ······································································································································································· 33Configuration terminal problems ·································································································································· 33Appendix A Chassis views and technical specifications ························································································ 34Chassis views ································································································································································· 34S5120-28C-EI ························································································································································ 34S5120-52C-EI ························································································································································ 35S5120-24P-EI ························································································································································· 36S5120-48P-EI ························································································································································· 36S5120-28C-PWR-EI ··············································································································································· 37S5120-52C-PWR-EI ··············································································································································· 38Technical specifications ················································································································································· 40Appendix B Ports and LEDs ······································································································································· 43Ports ················································································································································································· 43Console port ·························································································································································· 4310/100/1000Base-T Ethernet port ···················································································································· 43SFP port ·································································································································································· 43Combo interface ···················································································································································· 43LEDs ················································································································································································· 44System status LED··················································································································································· 44RPS status LED ························································································································································ 45Port mode LED························································································································································ 45Seven-segment LED ················································································································································ 4510/100/1000Base-T auto-sensing Ethernet port status LED ············································································ 47SFP port status LED ················································································································································ 48Interface card status LED······································································································································· 49Appendix C FRUs and compatibility matrixes ········································································································· 50Interface cards ································································································································································ 50SFP/SFP+/XFP transceiver modules and SFP+/CX4 cables ····················································································· 50Appendix D Lightning protection of the switch ········································································································ 53Installation of lightning arrester for ac power (socket strip with lightning protection) ············································ 53Index ··········································································································································································· 55