Checking LEDs on the Nortel Ethernet Routing Switch 4500 Series 33Connecting AC power to the back panelWARNINGDisconnecting the AC power cord is the only way to turn off ACpower to the Nortel Ethernet Routing Switch 4500 Series. Alwaysconnect the AC power cord in a quickly and safely accessiblelocation in case of an emergency. For a translation of thisstatement, see "Translations of safety messages" (page 53).Checking LEDs on the Nortel Ethernet Routing Switch 4500 SeriesThe figures and tables in the following sections describe the LEDs on theNortel Ethernet Routing Switch 4500 Series switches. The tables describeLED operation for a switch that finishes the power-on self-test.Front panel LEDs"Nortel Ethernet Routing Switch 4548GT" (page 34)"Nortel EthernetRouting Switch 4548GT-PWR" (page 34),"Nortel Ethernet Routing Switch4550T" (page 34)"Nortel Ethernet Routing Switch 4550T-PWR" (page 35)and "Nortel Ethernet Routing Switch 4526FX" (page 35)diagrams illustratethe components on the front panels of the Nortel Ethernet Routing Switch4500 Series switches. For detailed explanations of the states indicated byeach front panel LED type, see the following sections:• "Switch LED state indicators" (page 36)• "Port LED state indicators" (page 37)• "SFP transceiver Port LED state indicators" (page 37)Nortel Ethernet Routing Switch 4500 SeriesInstallation GuideNN47205-300 02.01 Standard5.0 23 February 2007Copyright © 2007, Nortel Networks Nortel Networks Confidential.
