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Catalyst 3550 Switch Hardware Installation Guide
OL-6155-01
Chapter 1 Product Overview
Front-Panel Description
SPEED Port speed The port operating speed: 10, 100, or 1000 Mbps.
LINE PWR
2
Port inline power The inline power status: on or off.
1. Not available on Catalyst 3550-24PWR switches
2. Available only on Catalyst 3550-24PWR switches
Table 1-5 Meaning of LED Colors in Different Modes
Port Mode LED Color Meaning
STATUS
(port status)
Off No link, or port was administratively shut down.
Solid green Link present.
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 a link-fault indication.
Solid amber Port is blocked by Spanning Tree Protocol (STP) and is not
forwarding data.
Note After a port is reconfigured, the port LED can remain amber
for up to 30 seconds as STP checks the switch for possible
loops.
Blinking amber Port is blocked by STP and is sending or receiving packets.
UTIL
1
(utilization)
1. Not available on Catalyst 3550-24PWR switches
Green Port LEDs display backplane utilization on a logarithmic scale. (See
Figure 1-4 through Figure 1-8.)
Amber Peak total backplane utilization over the last 24 hours.
DUPLX
(duplex)
Off Port is operating in half duplex.
Green Port is operating in full duplex.
SPEED
10/100 and 10/100/1000 ports
Off Port is operating at 10 Mbps.
Green Port is operating at 100 Mbps.
Blinking green Port is operating at 1000 Mbps.
GBIC ports
Off Port is not operating.
Blinking green Port is operating at 1000 Mbps.
LINE PWR
2
2. Available only on Catalyst 3550-24PWR switches
Off Inline power is off.
Green Inline power is on.
If the Cisco IP Phone is receiving power from an AC power source,
the port LED is off even if the IP phone is connected to the switch
port. The LED turns green only when the switch port is providing
power.
Table 1-4 Port Mode LEDs (continued)
Mode LED Port Mode Description