Cisco Catalyst 2960-X Configuration Guide

Power Management Modes
The switch supports these PoE modes:
• auto—The switch automatically detects if the connected device requires power. If the switch discovers
a powered device connected to the port and if the switch has enough power, it grants power, updates the
power budget, turns on power to the port on a first-come, first-served basis, and updates the LEDs. For
LED information, see the hardware installation guide.
If the switch has enough power for all the powered devices, they all come up. If enough power is available
for all powered devices connected to the switch, power is turned on to all devices. If there is not enough
available PoE, or if a device is disconnected and reconnected while other devices are waiting for power,
it cannot be determined which devices are granted or are denied power.
If granting power would exceed the system power budget, the switch denies power, ensures that power
to the port is turned off, generates a syslog message, and updates the LEDs. After power has been denied,
the switch periodically rechecks the power budget and continues to attempt to grant the request for
power.
If a device being powered by the switch is then connected to wall power, the switch might continue to
power the device. The switch might continue to report that it is still powering the device whether the
device is being powered by the switch or receiving power from an AC power source.
If a powered device is removed, the switch automatically detects the disconnect and removes power
from the port. You can connect a nonpowered device without damaging it.
You can specify the maximum wattage that is allowed on the port. If the IEEE class maximum wattage
of the powered device is greater than the configured maximum value, the switch does not provide power
to the port. If the switch powers a powered device, but the powered device later requests through CDP
messages more than the configured maximum value, the switch removes power to the port. The power
that was allocated to the powered device is reclaimed into the global power budget. If you do not specify
a wattage, the switch delivers the maximum value. Use the auto setting on any PoE port. The auto mode
is the default setting.
• static—The switch pre-allocates power to the port (even when no powered device is connected) and
guarantees that power will be available for the port. The switch allocates the port configured maximum
wattage, and the amount is never adjusted through the IEEE class or by CDP messages from the powered
device. Because power is pre-allocated, any powered device that uses less than or equal to the maximum
wattage is guaranteed to be powered when it is connected to the static port. The port no longer participates
in the first-come, first-served model.
However, if the powered-device IEEE class is greater than the maximum wattage, the switch does not
supply power to it. If the switch learns through CDP messages that the powered device needs more than
the maximum wattage, the switch shuts down the powered device.
If you do not specify a wattage, the switch pre-allocates the maximum value. The switch powers the
port only if it discovers a powered device. Use the static setting on a high-priority interface.
• never—The switch disables powered-device detection and never powers the PoE port even if an
unpowered device is connected. Use this mode only when you want to make sure that power is never
applied to a PoE-capable port, making the port a data-only port.
For most situations, the default configuration (auto mode) works well, providing plug-and-play operation. No
further configuration is required. However, perform this task to configure a PoE port for a higher priority, to
make it data only, or to specify a maximum wattage to disallow high-power powered devices on a port.
Catalyst 2960-XR Switch Interface and Hardware Component Configuration Guide, Cisco IOS Release 15.0(2)EX1
86 OL-29420-01
Configuring PoE
Power over Ethernet Ports

Cisco Catalyst 2960-X Specifications

General

Console port	RJ-45
USB 2.0 ports quantity	2
SFP module slots quantity	4
Installed SFP modules quantity	-
Gigabit Ethernet (copper) ports quantity	48
Basic switching RJ-45 Ethernet ports type	Gigabit Ethernet (10/100/1000)
Power source	AC
Input current	5 A
AC input voltage	100 - 240 V
Power consumption (typical)	60.9 W
Number of power supply units	1
Redundant power supply (RPS) support	Yes
Operating altitude	0 - 3000 m
Non-operating altitude	0 - 4000 m
Storage temperature (T-T)	-25 - 70 °C
Operating temperature (T-T)	-5 - 40 °C
Operating relative humidity (H-H)	10 - 95 %
Switching protocols	UDP, TCP, RADIUS/TACACS+
Number of VLANs	1023
Networking standards	IEEE 802.1ab, IEEE 802.1D, IEEE 802.1p, IEEE 802.1Q, IEEE 802.1s, IEEE 802.1w, IEEE 802.1x, IEEE 802.3, IEEE 802.3ab, IEEE 802.3ad, IEEE 802.3ae, IEEE 802.3af, IEEE 802.3ah, IEEE 802.3at, IEEE 802.3az, IEEE 802.3u, IEEE 802.3x, IEEE 802.3z
Throughput	107.1 Mpps
Jumbo frames	9216
Number of queues	8
MAC address table	16000 entries
Number of static routes	1000
DHCP features	DHCP server
Authentication	MAC-based authentication, Port-based authentication
Security algorithms	802.1x RADIUS, SNMP, SSH
Access Control List (ACL) rules	3
Switch type	Managed
Switch layer	L2/L3
Safety	UL 60950-1, CAN/CSA-C22.2 No. 60950-1, EN 60950-1, IEC 60950-1, AS/NZS 60950-1
Form factor	1U
Product color	Black
Total Power over Ethernet (PoE) budget	370 W
Power over Ethernet (PoE) ports quantity	24
Power over Ethernet plus (PoE+) ports quantity	12
Memory type	DRAM
Noise level	39 dB
Flash memory	128 MB
Internal memory	512 MB
Processor frequency	600 MHz
Mean time between failures (MTBF)	276870 h

Weight and Dimensions

Depth	368 mm
Width	445 mm
Height	45 mm
Weight	5800 g