37NOTE:• To guarantee the functionality of the SFP ports, always use H3C SFP transceiver modules on the H3CS3100V2-52TP Switch.• The SFP transceiver modules available for this switch are subject to change over time. For the mostup-to-date list of SFP transceiver modules, consult your H3C sales representative or technical supportengineer.• For the SFP transceiver module specifications, see theH3C Low End Series Ethernet Switches PluggableModules Manual.• For how to install or remove an SFP module, see theH3C Pluggable SFP/SFP+/XFP TransceiverModules Installation Guide.Combo interfaceA combo interface has one fiber SFP port and one 1000Base-T copper Ethernet port. These two portsshare one port number and cannot work simultaneously. When you activate one port, the other portautomatically shuts down.On the front panel of an S3100V2-52TP switch, the copper combo ports are marked in the port number+ T format, and the fiber SFP combo ports are marked in the port number + S format, as shown in Figure29.Figure 29 Identify the combo ports on the S3100V2-52TP front panelLEDsSystem status LEDThe system status LED shows the operating status of the switch.Table 11 System status LED descriptionLED Status DescriptionSteady green The switch is operating properly.PWRFlashing green (1Hz) The switch is performing power-on self test (POST).