40 Installing the Nortel Ethernet Routing SwitchWARNINGDisconnecting 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 65).Checking Light Emitting Diode (LED) on the Nortel Ethernet RoutingSwitch 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 LEDsThe following diagrams illustrate the components on the front panels of theNortel Ethernet Routing Switch 4500 Series switches:• "Nortel Ethernet Routing Switch 4548GT" (page 41)• "Nortel Ethernet Routing Switch 4548GT-PWR" (page 41)• "Nortel Ethernet Routing Switch 4550T" (page 41)• "Nortel Ethernet Routing Switch 4550T-PWR" (page 41)• "Nortel Ethernet Routing Switch 4526FX" (page 42)• "Nortel Ethernet Routing Switch 4526T" (page 42)• "Nortel Ethernet Routing Switch 4526T-PWR" (page 43)• "Nortel Ethernet Routing Switch 4526GTX" (page 43)• "Nortel Ethernet Routing Switch 4526GTX-PWR" (page 44)• "Nortel Ethernet Routing Switch 4524GT" (page 43)For detailed explanations of the states indicated by each front panel LEDtype, see the following sections:• "Switch LED state indicators" (page 44)• "Port LED state indicators" (page 45)• "SFP transceiver Port LED state indicators" (page 46)Nortel Ethernet Routing Switch 4500 SeriesInstallation GuideNN47205-300 (322811-B) 03.01 Standard5.1 19 November 2007Copyright © 2007, Nortel Networks.
