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Chapter 1
Product Overview
Table 1-9
Port Mode
DUPLX
(duplex)
MAST
(data stack
master)
STACK
(stack member)
PoE+
1. Only Catalyst 3750-X switches.
2. Only switches with PoE or PoE+ ports.
USB Console LED
The USB console LED shows whether there is an active USB connection to the port.
OL-19593-01
Meaning of Switch LED Colors in Different Modes (continued)
Port LED Color
Off
Green
1
Off
Green
Amber
1
Off
Blinking green Stack member number.
Green
2
Off
Green
Alternating
green and
amber
Blinking amber PoE+ is off due to a fault or because it has exceeded a limit set in
Amber
Meaning
Port is operating in half duplex.
Port is operating in full duplex.
The switch is not the stack master.
Note
For a standalone switch, this LED is off.
The switch is the stack master.
Error during stack master election.
No stack member corresponding to that member number.
Member numbers of other stack member switches.
PoE+ is off.
If the powered device is receiving power from an AC power source,
the port LED is off even if the device is connected to the switch port.
PoE+ is on. The port LED is green when the switch port is providing
power.
PoE+ is denied because providing power to the powered device will
exceed the switch power capacity.
the switch software.
PoE+ faults are caused when noncompliant cabling or
Caution
powered devices are connected to a PoE+ port. Use only
standard-compliant cabling to connect Cisco prestandard
IP Phones and wireless access points or
IEEE 802.3af-compliant devices to PoE+ ports. You must
remove from the network any cable or device that causes
a PoE+ fault.
PoE+ for the port has been disabled.
PoE+ is enabled by default.
Note
Catalyst 3750-X and 3560-X Switch Hardware Installation Guide
Front Panel Description
1-11
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