This document describes the different power options that are available
with these products:
There are no specific requirements for this document.
The information in this document is based on these hardware
The information in this document was created from the devices in a
specific lab environment. All of the devices used in this document started with
a cleared (default) configuration. If your network is live, make sure that you
understand the potential impact of any command.
Technical Tips Conventions for more information on document
Cisco Discovery Protocol is a device discovery protocol that runs on
all Cisco-manufactured equipment, such as routers, bridges, and communication
servers. Each device sends periodic messages to a multicast address and listens
to the messages that others send in order to learn about neighboring devices.
When the Aironet device boots, it sends a CDP packet with the information that
the device is inline power-enabled. Then, the switch, or a comparable device,
can supply the requested power.
The Cisco Aironet APs support local power as well as Power over
Ethernet (PoE), either by an IEEE 802.3af-compliant Power Sourcing Equipment
(PSE) device, such as a switch, or by a device capable that provides the
required power and compliant with Cisco Inline Power. This does not affect the
performance or range of the AP in any way.
The AP disables the radio interfaces when the unit senses that the
power source to which it is connected does not provide enough power. It is
possible, due to the power source, that you need to enter the power source type
in the access point configuration.
If Cisco CDP is enabled, the AP tries to negotiate with the use of CDP.
If CDP tells the AP that it cannot supply the power, the unit shuts down the
radios. CDP is enabled on the Ethernet port of the APs by default. But, CDP is
enabled on the radio port of the access points only when the radio is
associated to another wireless infrastructure device, such as an access point
or a bridge.
If you want to use a power injector to supply power to an AP and if POE
is also available in the network, disable CDP on that port so that the AP draws
power from the Power injector.
Power to Aironet 350 Series equipment is supplied through Category 5
cable to the Ethernet port (inline). There is no separate power socket on the
350 Series equipment. The option to supply power to the devices over the data
cable infrastructure eliminates the need for local power and AC infrastructure
costs. This is the fundamental difference between the 340 and 350 Series
The Aironet 350 Series AP includes a 10/100-Mbps Ethernet uplink for
seamless integration with existing wired LANs. In order to minimize
installation costs, the Aironet 350 Series AP draws operating power from a
powered Ethernet port. This line power configuration works with all Cisco line
power-enabled devices, such as Catalyst switches and line power patch panels.
You can also use a line power injector, which is included with the product, in
order to power the Aironet 350 Series AP.
The voltage requirement for the 350, 1100, and 1200 Series is 48
These diagrams show the power-up options for a 350 Series Aironet AP
You can connect these devices to the 350, 1100, and 1200 Series of
Note: This list is not all-inclusive.
Catalyst 6500/6000 Series Switches:
Catalyst 4500/4000 Series Switches:
Catalyst 3550 Series Switches:
Catalyst XL Series Switches:
48-port Power Patch Panel (WS-PWR-PANEL)
Note: You can use the Power Patch Panel with any switch that does not use
inline power modules. This diagram provides an example:
Power Injector module (AIR-PWRINJ or AIR-PWRINJ3)
The Power Injector module is a simple device with two ports:
One port connected to the bridge or AP
The other port connected to the wired part of the network, such as
a noninline-capable switch or a hub
The module is connected to an AC adapter that provides the connection
to the power cord.
Caution: You can use the Cisco Power Injector with these devices
If you attach any other Ethernet device to the power end of the power
injector, damage to the Ethernet device occurs. These are examples of such
Ethernet devices to avoid:
Note: The maximum distance that is supported for inline power is 100 meters
(m). This distance is the same for every Ethernet connection over Category 5
Note: The references to devices that support inline power were accurate at
the time that this document was written. Check with your local Cisco sales
office or the Products pages on
Cisco.com for a current list of devices
that support inline power devices, such as the IP telephones and the Aironet
The Aironet 1100 Series AP provides a high-speed, secure, affordable,
and easy-to-use WLAN solution that combines the freedom and flexibility of
wireless networking with the features and services that Enterprise networks
require. You can power the Aironet 1100 Series APs with local power or through
inline power from a Power over Ethernet (PoE)-capable device. If the AC power
source is close to the AP, you can use an external power adapter in order to
power up the AP. And, as with the 350 Series equipment, you can use of any of
these devices in order to power up with the PoE option:
Aironet Power Injector products increase the deployment flexibility of
Aironet wireless APs and bridges. The Aironet Power Injectors provide an
alternative power option to local power, inline power-capable multiport
switches, and multiport power patch panels. Refer to the
Aironet Power Injector Data Sheet for more information on Aironet Power
The Cisco Aironet 1140 Series Access Point is a business-ready 802.11n
access point designed for simple deployment and energy efficiency. The
high-performance platform, which offers at least six times the throughput of
existing 802.11a/g networks, prepares the business for the next wave of mobile
devices and applications. Designed for sustainability, the 1140 series delivers
high performance from standard 802.3af Power over Ethernet. One of these
options can be used to power the 1140 series AP:
Note: AP draws a total power of 12.95W. When deployed using PoE, the power
drawn from the power sourcing equipment will be higher by some amount dependent
on the length of the interconnecting cable. This additional power may be as
high as 2.45W, bringing the total system power draw (access point + cabling) to
The nominal voltage for 1200 Series APs is 48 VDC, and the AP is
operational up to 60 VDC. You can power the 1200 Series APs in one of these
Caution: Voltage that is higher than 60 VDC can damage the equipment. You
cannot provide redundant power to 1130 AG and 1200 Series APs with both DC
power to the power port and inline power that a patch panel or switch to the AP
Ethernet port provides. If you apply power to the AP from both sources, the
switch or power patch panel can shut down the port to which the AP
There are certain circumstances where an AP can end up without
sufficient power and disable its radios. Assume that a 1130 AG Lightweight AP
is connected to a controller. The lightweight AP is connected to a power
injector as well as to a switch that is not capable of providing the inline
While the AP boots, with its Intelligent Power Management feature, it
negotiates with the switch via Cisco Discovery Protocol messages in order to
provide the necessary power to the AP. Even though the power injector is
connected to the AP, the AP that uses this Intelligent Power Management feature
gives priority to the Cisco Discovery Protocol information in order to identify
whether or not the switch can provide the power. Therefore, after the Cisco
Discovery Protocol message shows that the switch does not provide sufficient
power (since it is not an inline power capable switch), the AP disables its
radios. At this time, the status LED of the AP turns orange and this error
message is recorded:
[ERROR] : AP <Ap mac-address> has not enough in-line power
to enable radio slot 1
In order to overcome this problem, issue the config ap
power injector enable <Ap name as shown on the
controller> installed command on the controller
that is connected with this AP. This command is available from controller
version 220.127.116.11. Ensure that you use the correct version in the
This command specifies that a power injector is used in order to supply
sufficient power to the AP.
The Aironet 1240 AG Series AP ships with a 100- to 240-VAC power supply
that provides 48 VDC to locally power the AP. You can order the Aironet 1240 AG
series to ship without the power supply. If you intend to power the AP from an
inline power-capable switch, you do not require the power supply.
Note: The power injector does not come with a power supply. Instead, the
power injector uses the power supply from the AP. If you intend to use the
power injector, be sure that the power supply is included with your AP. If you
previously ordered the AP without a power supply, you need to order a spare
power supply in order to use the power injector.
The Cisco Aironet 1250 Series is an enterprise-class 802.11n access
point designed for challenging RF environments. A dual-band rugged indoor
access point, the 1250 Series supports data rates of up to 600 Mbps to provide
users with reliable and predictable coverage for high-bandwidth data, voice,
and video applications. 1250 series APs can be powered using these
Cisco Catalyst switch port capable of sourcing 20W or
Cisco AP1250 Power Injector (AIR-PWRINJ4)
Cisco AP1250 Local Power Supply (AIR-PWR-SPLY1)
802.3af switch (AP1250 with single radio
The Cisco Aironet 1400 Series Wireless Bridge ships with all of the
components and accessories necessary to complete most deployments. These
components and accessories include:
The Cisco Aironet Power Injector LR for supplying power to the
bridge without expensive electrician costs (Power Injector).
The power injector also extends the distance the Cisco 1400 Series
Wireless Bridge can be installed from the network (see
The Cisco Aironet 1400 Series Multifunction Mount, with its
innovative design, provides greater ease of installation and flexibility. The
mount comes complete with stainless steel hardware to improve corrosion
Two lengths of shielded Dual RG-6 cables and a building entry point
grounding block, all with F-Type connectors for use with the Cisco Aironet
Power Injector LR and connection to the bridge unit.
A power supply and cord, enough coaxial sealant for all outdoor
connectors, and corrosion-proof gel to protect grounding
The Power Injector LR converts the standard 10/100 baseT Ethernet
category 5 RJ-45 interface that is suitable for weather-protected areas to a
dual F-Type connector interface for dual coax cables that are more suitable for
harsh outdoor environments. While providing a 100baseT interface to the Cisco
Aironet 1400 Series, the Power Injector LR also provides power to the unit over
the same cables with a power discovery feature that protects other appliances
from damage should they accidentally be connected. As an added benefit to the
installer, Auto MDIX is built in. This allows the dual cables to be swapped and
maintains the same functionality. In order to support longer cable runs from
your infrastructure network switch or router, the Power Injector LR is designed
to accommodate 100 m coaxial cable run plus 100 m of indoor cat5 cable, to
enable total cable runs up to 200 meters. Lightning and surge protection is
also included at the F-Type connector interface to provide added protection to
your network infrastructure devices. Refer to
Aironet 1400 Series Wireless Bridge for more information.
A flexible outdoor wireless bridge or access-point solution is provided
through the combination of the Cisco Aironet 1300 Series, a power injector, and
options for both antennas and mounting. This diagram shows how the units
The Power Injector LR2 converts the standard 10/100 BaseT Ethernet
category 5 RJ-45 interface that is suitable for weather-protected areas to a
dual F-Type connector interface for dual coaxial cables that are more suitable
for harsh outdoor environments. This port is unconfigurable. While providing a
100baseT interface to the Cisco Aironet 1300 Series, the Power Injector LR2
also provides power to the unit over the same cables with a power discovery
feature that protects other appliances from damage should they accidentally be
connected. The ports on the switch are set for auto-speed and auto-duplex, and
auto-MDIX. Port 0 on the switch is used for the coaxial link to the bridge and
port 1 on the switch is used for the RJ-45 jack on the power injector. The
other switch ports are unused. For more information, refer to
Aironet 1300 Series Outdoor Access Point/Bridge and
Aironet 1300 Series Access Point/Bridge Power Injector.
You can use either of these methods in order to power the Aironet 1500
Power that is supplied at the top of streetlight poles is AC power.
Use the Aironet 1500 Series Streetlight Power Tap in order to plug the AP into
this power source.
When an Aironet 1500 Series AP is installed on the roof of a
building, you can use a power injector in order to supply PoE. The power
injector converts AC power into DC power and sends the power along with the
Ethernet signal to the AP. Use the Aironet 1500 Series Power Injector, along
with the Aironet 1500 Series Outdoor Ethernet Cable, in order to power the AP.
Do not use any other power injector. You need to specify the country-specific
power cord with the power injector.
Note: You must use only the power injector that is specified for this
model of access point in order to power up these APs. Power options such as PoE
switches, and 802.3af power sources do not provide adequate power, which can
cause the access point to malfunction and cause over-current conditions at the
Note: You must ensure that the switch port connected to the access point
has PoE turned off in order to avoid the AP being powered up through a PoE
Note: This is because when the AP is powered through PoE switches, the AP
experiences poor signal strength when implemented in a long distance range. APs
powered through Power Injector do not experience this problem.
The Aironet 1000 Series Lightweight AP is an 802.11a/b/g dual-band,
zero-touch configuration and management AP. It delivers secure, cost-effective
wireless access with advanced WLAN services for Enterprise deployments. You can
power the 1000 Series Lightweight APs with the PoE option or with an external
power supply. IEEE standards-based 802.3af PoE allows you to power the 1000
Series Lightweight APs over unused pairs in the Ethernet cable. A power
injector or a switch with inline power is necessary in order to power the AP
with the PoE option. The external power supply option allows the 1000 Series
Lightweight APs to be easily moved during the site survey in order to verify
radio frequency (RF) building characteristics.
The Cisco 2000 Series WLC supports up to six lightweight APs, which
makes it ideal for small- to medium-sized Enterprise facilities, such as branch
offices. The PoE option is not supported on the 2000 Series WLC because the
controller does not supply PoE. In order to use PoE to power APs, you must use
a Cisco PoE injector or an external third-party PoE injector. The controller is
powered by an external power supply that accepts power from an electrical
outlet (100 to 240 VAC, 50 to 60 Hz).
The Cisco® 2106 Wireless LAN Controller works in conjunction with Cisco
lightweight access points and the Cisco Wireless Control System (WCS) in order
to provide system-wide wireless LAN functions. As a component of the Cisco
Unified Wireless Network, the Cisco 2106 Wireless LAN Controller presents
network administrators with the visibility and control necessary to effectively
and securely manage business-class WLANs and mobility services, such as voice,
guest access, and location services.
The 2100 controller is powered by an external power supply that accepts
power from an electrical outlet (100 to 240 VAC, 50 to 60 Hz).
Cisco 2100 series controllers have eight 10/100 copper Ethernet
distribution system ports through which the controller can support up to six
access points. Two of these ports (7 and 8) are Power over Ethernet (PoE)
enabled and can be used to provide power directly to access points that are
connected to these ports.
The Cisco 4100 Series WLCs and 4400 Series WLCs are designed for
medium- to large-sized Enterprise facilities. Both series support the PoE
option. You can use the PoE option to power the lightweight APs that connect to
the controller. In addition, each 4400 WLC supports an optional redundant power
supply in order to ensure maximum availability.
The Cisco 5500 Series Wireless Controller is a highly scalable and
flexible platform that enables systemwide services for mission-critical
wireless in medium to large-sized enterprises and campus environments. The
controller can be powered using one or two power supply units. When the
controller is equipped with two power supply units, the power supplies are
redundant. Either power supply continues to power the controller should the
other power supply unit fail. Also, the power supplies are hot swappable; you
do not need to remove power from the controller to replace a power supply. For
more information on power supply to the WLC, refer to
a Power Supply Unit section of the
5500 Series Wireless Installation Guide.