Cisco Systems CGS252016S8PC manual PoE LED, Dual-Purpose Port LEDs, SD Flash Memory Card LED

Chapter 1 Product Overview

Cable Side

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		Not enabled
Green		Enabled and ports are functioning correctly
Alternating green and amber		Enabled but power is disconnected or has failed on a low-priority port
Blinking amber		Enabled but power is disconnected or has failed on a high-priority port
Amber		Enabled and a PoE circuit failure is detected

Dual-Purpose Port LEDs

The dual-purpose port LEDs identify the connection as either a copper-based connector or an SFP module. The ports can autonegotiate, or you can manually configure each dual-purpose port as either 10/100/1000 with copper connectors or as an SFP-module port, but not as both types at the same time. See Table 1-8for LED descriptions.

SD Flash Memory Card LED

Table 1-10	SD Flash Memory Card LED
Color		System Status
Off / blinking green		Transfer in progress
Blinking amber		Not present (slow blinking); unsupported SD flash memory card is
		detected (fast blinking)

Cisco CGS 2520 Hardware Installation Guide

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