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Cisco CGS 2520 Hardware Installation Guide
78-19377-02
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.
PoE LEDDual-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 1-8 for LED descriptions.
SD Flash Memory Card LED
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 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
Table 1-10 SD Flas h Memo ry 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)