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Cisco CGS 2520 Hardware Installation Guide
OL-31444-01
Chapter 1 Product Overview
LEDs
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.
PoE LED
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
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
green-amber
Link fault. Error frames can affect connectivity, and errors such as excessive
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.
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
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