Cisco 3750G-12S Hardware Installation Guide - Page 28

Port Mode, Port LED Color, Meaning, Table 1-6, Meaning of LED Colors in Different Modes on the Switch - 3750 error switch

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10/100 and 10/100/1000 Ports Chapter 1 Product Overview Table 1-6 Port Mode PoE1 Meaning of LED Colors in Different Modes on the Switch Port LED Color Meaning Off PoE is off. If the powered device is receiving power from an AC power source, the port LED is off even if the powered device is connected to the switch port. Green PoE is on. The port LED is green only when the switch port is providing power. Alternating green and amber PoE is denied because providing power to the powered device will exceed the 370 W switch power capacity. Blinking amber PoE is off due to a fault. STAT (port status) DUPLX (duplex) Caution PoE faults are caused when noncompliant cabling or powered devices are connected to a PoE port. Only standard-compliant cabling can be used to connect Cisco pre-standard IP Phones and wireless access points or IEEE 802.3af-compliant devices to PoE ports. A cable or device that causes a PoE fault must be removed from the network. Amber PoE for the port has been disabled. Note PoE is enabled by default. Off No link, or port was administratively shut down. 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, cyclic redundancy check (CRC) errors, and alignment and jabber errors are monitored for a link-fault indication. 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 and receiving packets. Off Port is operating in half duplex. Green Port is operating in full duplex. 1-18 Catalyst 3750 Switch Hardware Installation Guide OL-6336-10

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1-18
Catalyst 3750 Switch Hardware Installation Guide
OL-6336-10
Chapter 1
Product Overview
10/100 and 10/100/1000 Ports
Table 1-6
Meaning of LED Colors in Different Modes on the Switch
Port Mode
Port LED Color
Meaning
PoE
1
Off
PoE is off. If the powered device is receiving power from an AC
power source, the port LED is off even if the powered device is
connected to the switch port.
Green
PoE is on. The port LED is green only when the switch port is
providing power.
Alternating
green and
amber
PoE is denied because providing power to the powered device will
exceed the 370 W switch power capacity.
Blinking amber
PoE is off due to a fault.
Caution
PoE faults are caused when noncompliant cabling or
powered devices are connected to a PoE port. Only
standard-compliant cabling can be used to connect Cisco
pre-standard IP Phones and wireless access points or
IEEE 802.3af-compliant devices to PoE ports. A cable or
device that causes a PoE fault must be removed from the
network.
Amber
PoE for the port has been disabled.
Note
PoE is enabled by default.
STAT
(port status)
Off
No link, or port was administratively shut down.
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, cyclic redundancy check (CRC) errors, and
alignment and jabber errors are monitored for a link-fault
indication.
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 and receiving packets.
DUPLX
(duplex)
Off
Port is operating in half duplex.
Green
Port is operating in full duplex.