Cisco Systems CGS 2520 manual Port LEDs, PoE LED, Color Description, LED Color Meaning

Chapter 1 Product Overview

LEDs

Table 1-7	RJ-45 and USB Console Port LEDs
LED		Color	Description
RJ-45 console port		Green	RJ-45 console port is active.; USB console port LED is off
		Off	Port is not active; USB console port is active
USB console port		Green	USB console port is active; RJ-45 console port LED is off
		Off	Port is not active; RJ-45 console port is active

Port LEDs

RJ-45 ports and SFP module slots have port LEDs. Port LEDs, as a group or individually, provide information about the switch and about the individual ports.

Table 1-8 Meaning of Port LED Colors

LED Color	Meaning
Off	No link or port was administratively shut down
Green	Link present but not sending or receiving data
Blinking green	Activity. Port is sending or receiving data
Alternating	Link fault. Error frames can affect connectivity, and errors such as excessive
green-amber	collisions, CRC errors, and alignment and jabber errors are monitored for link
	faults
Amber	Port is blocked by Spanning Tree Protocol (STP) and is not forwarding data.
	After a port is reconfigured, the port LED is amber for up to 30 seconds as
	STP searches for loops.

PoE LED

Table 1-9	PoE LED
Color		Meaning
Off		PoE/PoE+ not enabled
Green		PoE/PoE+ enabled and ports are functioning correctly
Alternating green and amber		PoE/PoE+ enabled but power is disconnected or has failed on a
		low-priority port
Blinking amber		PoE/PoE+ enabled but power is disconnected or has failed on a
		high-priority port
Amber		PoE/PoE+ enabled and a PoE/PoE+ circuit failure is detected

	Cisco CGS 2520 Hardware Installation Guide
OL-31444-01		1-11