Cisco Aironet 1520 Series User manual

GETTING STARTED GUIDE
Cisco Aironet 1520 Series Outdoor Mesh Access Points
INCLUDING LICENSE AND WARRANTY
1About this Guide
2Introduction to the Access Point
3Unpacking the Access Point
4Becoming Familiar With the Access Point
5Network Deployment Examples
6Preparing the Access Point
7Deploying the Access Point
8In Case of Difficulty
9Cisco 90-Day Limited Hardware Warranty Terms

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1 About this Guide
This guide is designed to familiarize yourself with your Cisco Aironet 1520 Series Outdoor Mesh
Access Point and prepare it for use in your wireless network. Due to the complexity and number of
product options available, this guide does not provide detailed mounting and configuration
instructions. Those instructions can be found in the following documents:
•Cisco Mesh Networking Solution Deployment Guide
•Cisco Aironet 1520 Series Outdoor Mesh Access Point Hardware Installation Guide
•Cisco Aironet 1520 Series Access Point Power Injector Installation Instructions
Detailed configuration information can also be found in the Cisco wireless LAN controller
documentation for the controller and software release you are using. These and other documents are
available on Cisco.com. Follow these steps to access these documents:
Step 1 Browse to http://www.cisco.com.
Step 2 Click Support.A pop-up window appears.
Step 3 Click Wireless under View Information by Product Type. The Select Your Product or
Technology page appears.
Step 4 Enter Cisco Aironet 1520 Series in the Search for a Specific Product field and click Go. The
Cisco Aironet 1520 Series Introduction page appears.
Step 5 Choose the appropriate link for the documentation you want to view or download.
FCC Safety Compliance Statement
The FCC with its action in ET Docket 96-8 has adopted a safety standard for human exposure to radio
frequency (RF) electromagnetic energy emitted by FCC certified equipment. When used with approved
Cisco Aironet antennas, Cisco Aironet products meet the uncontrolled environmental limits found in
OET-65 and ANSI C95.1, 1991. Proper installation of this radio according to the instructions found
in this manual will result in user exposure that is substantially below the FCC recommended limits.

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Declaration of Conformity with Regard to the EU Directive 1999/5/EC
(R&TTE Directive)
This declaration is only valid for configurations (combinations of software, firmware and hardware)
provided and/or supported by Cisco Systems. The use software or firmware not supported/provided
by Cisco Systems may result that the equipment is no longer compliant with the regulatory
requirements.
General Safety Guidelines
Warnings
Safety warnings appear throughout this guide in procedures that may harm you if performed
incorrectly. A warning symbol precedes each warning statement. The warnings below are general
warnings that are applicable to the entire guide. Specific warnings are included in the sections to which
they apply.
Translated versions of the safety warnings in this guide are provided in the Safety Warnings for
Cisco Aironet 1520 Series Outdoor Mesh Access Points document that accompanies this guide.
The translated warnings are also in Appendix A of the Cisco Aironet 1520 Series Outdoor Mesh
Access Point Hardware Installation Guide, which is available at cisco.com.
Warning This warning symbol means danger. You are in a situation that could cause bodily injury.
Before you work on any equipment, be aware of the hazards involved with electrical
circuitry and be familiar with standard practices for preventing accidents. Use the
statement number provided at the end of each warning to locate its translation in the
translated safety warnings that accompanied this device.
Statement 1071
SAVE THESE INSTRUCTIONS
Warning There is the danger of explosion if the battery is replaced incorrectly. Replace the battery
only with the same or equivalent type recommended by the manufacturer. Dispose of
used batteries according to the manufacturer’s instructions. Statement 1015
Warning Do not operate the unit near unshielded blasting caps or in an explosive environment
unless the device has been modified to be especially qualified for such use.
Statement 364

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Warning This equipment must be externally grounded using a customer-supplied ground wire
before power is applied. Contact the appropriate electrical inspection authority or an
electrician if you are uncertain that suitable grounding is available.
Statement 366
Warning Read the installation instructions before connecting the system to the power source.
Statement 1004
Warning Only trained and qualified personnel should be allowed to install, replace, or service
this equipment. Statement 1030
Warning Ultimate disposal of this product should be handled according to all national laws and
regulations. Statement 1040
2 Introduction to the Access Point
The Cisco Aironet 1520 Series Outdoor Mesh Access Point (hereafter called the access point) is a
modularized outdoor access point designed for service in mesh networks. The access point can be
configured for one or two radio operation. Its 802.11b/g radio is used primarily for local access and
its 802.11a radio is used to provide wireless backhaul in the mesh. The access point is LWAPP
compliant based on Cisco’s Internetwork Operating System (IOS).
With two radios installed, the access point provides client access on its 802.11b/g radio, point-to-point
bridging, point-to-multipoint bridging and mesh networking on its 802.11a radio. With one radio
installed, the access point provides client access and wireless backhaul over its 802.11b/g radio.
The 5-GHz radio incorporates an Unlicensed National Information Infrastructure (UNII) radio
transceiver that can operate in either the Upper ISM 5.8-GHz frequency band or the 4.9-GHz Public
Safety Band. The 5-GHz radio on the access point is used for backhaul operations to the controller.
Note The 4.9-GHz Public Safety band requires a license and may be used only by qualified Public
Safety operators as defined in section 90.20 of the FCC rules.

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The access point is a standalone unit that can be cable strand or tower mounted. The access point can
also operate as a relay node for other access points not directly connected to a wired network.
Intelligent wireless routing is provided by the patent-pending Adaptive Wireless Path Protocol
(AWPP). This enables each access point to identify its neighbors and intelligently choose the optimal
path to the wired network by calculating the cost of each path in terms of signal strength and the
number of hops required to get to a controller. The access point is configured, monitored, and operated
through a Cisco wireless LAN controller (hereafter called a controller) as described in the appropriate
Cisco Wireless LAN Controller Configuration Guide. The Cisco Mesh Networking Solution
Deployment Guide describes how to plan and initially configure the Cisco mesh network, which
supports wireless point-to-point, point-to-multipoint, and mesh deployments. The controllers use a
browser-based management system, a command-line interface (CLI), or the Cisco Wireless Control
System (WCS) network management system to manage the controller and the associated access points.
The access point is compliant with Wi-Fi Protected Access 2 (WPA2) and employs hardware-based
Advanced Encryption Standard (AES) encryption between wireless nodes to provide end-to-end
security.
3 Unpacking the Access Point
Note When you are unpacking the access point, do not remove the foam blocks attached to the
antenna connectors. The foam protects the antenna connectors during installation.
Follow these steps to unpack the access point:
Step 1 Open the shipping container and carefully remove the contents.
Step 2 Return all packing materials to the shipping container and save it.
Step 3 Ensure that all items listed in the “Package Contents” section are included in the shipment.
Check each item for damage. If any item is damaged or missing, notify your authorized Cisco
sales representative.
Package Contents
Each access point package contains the following items:
•One 1520 series access point
•Installed mounting plate (attached to the back of the access point)
•Ground lug with screw and washer

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•Cisco Aironet 1520 Series Outdoor Mesh Access Point Mounting Instructions
•Translated Safety Warnings for Cisco Aironet 1520 Series Outdoor Mesh Access Points
•This guide
Optional Equipment
Depending on what you ordered, the following optional equipment may be part of your shipment:
•Cable modem (AIR-1520-CM-D2=)
•Battery, 6 amp hour (AIR-1520-BATT-6AH=)
•100BASE-BX10-U rugged SFP (GLC-FE-100BX-URGD=)
•Take-up reel for fiber cable (AIR-1520-FIB-REEL=)
•Pole mount kit (AIR-ACCMK1520=)
•Strand mount kit (AIR-ACCSMK1520=)
•Cable power module and supply (AIR-1520-CAB-PWR=)
•Band installation tool for pole mount kit (AIR-BAND-INS-TL=)
•Street light power tap (AIR-PWR-ST-LT-R3P=)
•AC power cord, 40 ft. (12.2 m) with North American plug (AIR-CORD-R3P-50NA=)
•Power injector (AIR-PWRINJ1500-2=)
•FIPS kit (AIRLAP-FIPSKIT=)
•Third-party lightning arrestors as required by local authorities
4 Becoming Familiar With the Access Point
The following illustrations show identify the access point connections. Before you begin the
installation process, use these illustrations to familiarize yourself with the access point.
Note The illustrations show all available connections for the configuration ordered. Unused
connections are capped to ensure the access point’s watertight integrity. Liquid tight
connectors are provided for all ports, which can be installed prior to or after deploying the
access point.

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Figure 1 shows the access point bottom connectors.
Figure 1 Access Point Bottom Connectors
Note Antenna port 5 is not shown in this illustration. The port is reserved for future use and will
be located midway between antenna ports 4 and 6.
1AC power connector 5Power-over-Ethernet (PoE) Out Ethernet connector
2Reserved for future use 6LEDs
3Antenna port 6 7Antenna port 4
4Fiber optic connector 8PoE-In Ethernet connector

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Figure 2 shows the access point left side and top connectors.
Figure 2 Access Point Left Side and Top Connectors
1Fiber connector 4Antenna port 2
2Cable Power over Cable (PoC) connector 5Antenna port 3
3Antenna port 1

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Figure 3 shows the access point right side connections.
Figure 3 Access Point Right Side Connections
Radio Operation
The 2.4-GHz radio supports three antennas for multi-input, single output (MISO) operation. The
radio uses three receivers to support maximum ratio combining (MRC) to enhance receiver
performance. MRC is a technique that combines the signals from multiple receivers in a manner to
optimize the signals. MRC can provide up to 3 dB of increased receive signal strength.
The access point does not support both radios configured for backhaul support.
1Ground screw holes 2DC power connector

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External Antennas
Warning In order to comply with radio frequency (RF) exposure limits, the antennas for this
product should be positioned no less than 6.56 ft (2 m) from your body or nearby persons.
Statement 339
Warning Do not locate the antenna near overhead power lines or other electric light or power
circuits, or where it can come into contact with such circuits. When installing the
antenna, take extreme care not to come into contact with such circuits, because they
may cause serious injury or death. For proper installation and grounding of the antenna,
please refer to national and local codes (for example, U.S.:NFPA 70, National Electrical
Code, Article 810, Canada: Canadian Electrical Code, Section 54). Statement 1052
Warning Only trained and qualified personnel should be allowed to install, replace, or service this
equipment.
Statement 1030
The access point is equipped with three N-type radio frequency (RF) connectors (antenna ports 1, 2,
and 3) on the top of the unit for external antennas to support multiple input single output (MISO)
operation as shown in Figure 1. The access point also has three N-type RF connectors (antenna ports
4, 5, and 6) on the bottom of the unit for external antennas as shown in Figure 2. When using the
optional Cisco compact omnidirectional antennas, the 2.4- and 5-GHz antennas connect directly to
the access point. The Cisco omnidirectional antennas use vertical polarization.
The access point can also be equipped with specific third-party external antennas (see Table 1), subject
to local regulatory requirements. If you install third-party antennas, be sure to install them with all
waterproofing steps recommended by the third-party manufacturer. For additional information, see
the documentation shipped with the antenna.
Note The FCC limits the amount of power this device can transmit. Power transmitted is a
combination of the amplification of the signal and the antenna gain. The access point has been
designed to operate with the antennas listed below having a maximum gain of 8 dBi for
2.5-GHz and 17 dBi for 5-GHz antennas. Antennas not included in this list or having a higher
gain are strictly prohibited for use with the access point. The required antenna impedance is
50 ohms.

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Note To reduce potential radio interference to other users, the antenna type and its gain should be
chosen so that the equivalent subtropical radiated power (EIRP) is not more than required for
successful communication.
Table 1 lists the supported external 2.4- and 5-GHz antennas.
Antenna Configurations
Two antenna configurations are available, based on how the access point is mounted. The cable strand
mounting configuration uses three antennas and the tower mount configuration uses four antennas.
Table 2 identifies the antenna ports used and explains the configurations.
Table 1 External 2.4- and 5-GHz Antennas
Part Number Model Gain (dBi)
AIR-ANT2450V-N 2.4-GHz compact omnidirectional1
1. The compact omnidirectional antennas mount directly on the access point.
5.5
AIR-ANT2480V-N 2.4-GHz omnidirectional 8.0
AIR-ANT5180V-N 5-GHz compact omnidirectional2
2. The compact omnidirectional antennas mount directly on the access point.
8.0
4.9-GHz compact omnidirectional3
3. Use of the 4.9-GHz band requires a license and may be used only by qualified Public Safety operators as defined in
section 90.20 of the FCC rules.
7.0
AIR-ANT58G10SSA-N 5-GHz sector 9.5
AIR-ANT5114P-N 4.9- to 5-GHz patch214.0
AIR-ANT5117S-N 4.9- to 5-GHz 90-degree sector217.0
Table 2 Antenna Ports and Configurations
Antenna Port Product Configuration
Cable Strand Mount
(Two Antenna Receive MRC Access and
One Backhaul)
Pole Mount
(Three Antenna Receive MRC Access and
One Backhaul)
1 2.4-GHz receive only 5-GHz receive and transmit
2 5-GHz transmit and receive No connection
3 2.4-GHz transmit and receive 2.4-GHz receive only

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Power
Warning Installation of the equipment must comply with local and national electrical codes.
Statement 1074
Warning This equipment must be externally grounded using a customer-supplied ground wire
before power is applied. Contact the appropriate electrical inspection authority or an
electrician if you are uncertain that suitable grounding is available. Statement 366
Warning Do not work on the system or connect or disconnect cables during periods of lightning
activity. Statement 1001
Caution Do not place the power injector in an unprotected outdoor environment because water
could get into the power injector and cause a short circuit and possible fire.
The access point supports the following power sources:
•Power-over-Ethernet—1520 power injector
•AC power—100 to 480 VAC
•Quazi-AC power-over-cable (POC)—40 to 90 V
•External 12 VDC power
4 No connection 2.4-GHz receive only
5 No connection No connection
6 No connection 2.4-GHz transmit and receive
Table 2 Antenna Ports and Configurations (continued)
Antenna Port Product Configuration
Cable Strand Mount
(Two Antenna Receive MRC Access and
One Backhaul)
Pole Mount
(Three Antenna Receive MRC Access and
One Backhaul)

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Warning Connect the unit only to DC power source that complies with the Safety Extra-Low
Voltage (SELV) requirements in IEC 60950 based safety standards Statement 1033
•Internal 6 ampere-hour battery
The access point can be connected to more than one power source. The access point detects available
input sources and switches to the preferred power source using the following prioritization:
•AC or POC power
•External DC power
•1520 power injector PoE power
•Internal battery power
Warning This unit might have more than one power supply connection. All connections must be
removed to de-energize the unit. Statement 1028
Note You can reconfigure the power source default prioritization. For more information, see the
documentation for the controller you are using.
Warning To reduce the risk of fire, use only No. 26 AWG or larger telecommunication line cord.
Statement 1023
Caution To provide inline PoE, you must use the 1520 series power injector. Other power
injectors, PoE switches, and 802.3af power sources cannot provide adequate power,
which may cause the access point to malfunction and cause over-current conditions at the
power source. You must ensure that the switch port connected to the access point has PoE
turned off.
Caution Do not install the power injector and the power outdoors. They must be installed indoors.

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Caution When the access point is installed outdoors or in a wet or damp location, the AC branch
circuit that is powering the access point should be provided with ground fault protection
(GFCI), as required by Article 210 of the National Electrical Code (NEC).
Three AC power cord options are available:
•40-ft (12.2-m) power cord for light pole installations in the US and Canada. One end of the power
cord is terminated with an access point AC power connector and the other end is terminated
with an AC plug (AIR-CORD-R3P-50NA=).
•40-ft (12.2-m) power cord for use outside the US and Canada. One end of the power cord is
terminated with an access point AC power connector and the other end is unterminated.
(AIR-CORD-R3P-50UE=).
•4-ft (1.2-m) streetlight power tap adapter for light pole installations in the US and Canada
(AIR-PWR-ST-LT-R3P=).
Ethernet (PoE) Ports
The access point supports an Ethernet uplink port (POE-In) and a downlink port (POE-Out). The
access point’s Ethernet uplink port uses an RJ-45 connector (with weatherproofing) to link the access
point to the 10BASE-T, 100BASE-T, or 1000BASE-T network. The Ethernet cable is used to send and
receive Ethernet data and to optionally supply inline 56-VDC power from the power injector. The
minimum length of this cable must be not less than 10 feet (3 meters).
The access point’s downlink Ethernet port uses an RJ-45 connector (with weatherproofing) to provide
LAN connectivity and IEEE 802.3af power to a peripheral customer device, such as a camera or sensor
gateway. The BVI MAC addresses are printed on the label on the side of the access point
Tip The access point senses the Ethernet and power signals and automatically switches internal
circuitry to match the cable connections.
Caution To provide inline PoE, you must use the 1520 series power injector. Other power
injectors, PoE switches, and 802.3af power sources can not provide adequate power,
which may cause the access point to malfunction and cause possible over-current
conditions at the power source.

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Cable Option
The factory-orderable cable option provides a cable modem and Power-over-Cable capabilities for the
access point for high-speed data transfer and Internet access. When the cable option is installed, the
access point uses its F-type cable connection to receive both data and power. Data is passed between
wireless clients on the mesh network to the cable company’s network via the access point’s internal
cable modem. In this configuration, the access point receives operating power from the cable. For
detailed installation information, see the Cisco Aironet 1520 Series Outdoor Access Point Hardware
Installation Guide. Configuration information can be found in the controller configuration guide of
the controller you are using.
Fiber Option
Warning Class 1 laser product. Statement 1008
The factory-orderable fiber option provides a fiber input and output capability. Fiber is data is
transmitted and received over a single-strand fiber cable which is connected to the access point using
a rugged 100BASE-BX10-U fiber small factor pluggable (SFP) module. For convenience, two fiber
connections are available on the access point. One connection is on the bottom of the unit (shown on
Figure 1) and the other on the left side (shown on Figure 2). Client data is passed to the network
controller through the fiber connection via a fiber capable switch. For detailed installation information
about the fiber option, see the Cisco Aironet 1520 Series Outdoor Mesh Access Point Hardware
Installation Guide. Configuration information can be found in the controller configuration guide of
the controller you are using.
5 Network Deployment Examples
The access point is a wireless device designed for wireless client access and point-to-point bridging,
point-to-multipoint bridging, and point-to-multipoint mesh wireless connectivity. The access point
provides 5-GHz backhaul capability to link with another access point to reach a wired network
connection or to provide repeater operations for other access points.
The access point plays two primary radio roles: a root access point (hereafter called a RAP) or a
non-root access point (hereafter called a MAP), which is the default role of all access points. When the
access point has a wired Ethernet or cable connector connection to the controller (through a switch),
the radio role is called a RAP. In order to be considered a RAP, the access point must be configured as
a RAP. A RAP is a parent node to any bridging or mesh network. A controller can support one or more

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RAPs, each one parenting the same or different wireless networks. There can be more than one RAP
for the same mesh network for redundancy. RAPs and MAPs can support wireless clients on the
2.4-GHz band.
When the access point does not have a wired Ethernet connection to the controller (through a switch),
the radio role is called a MAP. The MAPs have a wireless connection (through the backhaul interface)
to other MAPs and finally to a RAP which has an Ethernet connection through a switch to the
controller. MAPs may also have a wired Ethernet connection to a local LAN and serve as a bridge
endpoint for that LAN (using a point-to-point or point-to-multipoint bridge connection).
Wireless Backhaul
The access point supports wireless backhaul capability using the 5-GHz radio to bridge to another
access point to reach a wired network connection to a controller as shown in Figure 4. The access point
connected to the wired network is considered a RAP in this configuration. The remote access point is
considered a MAP and transfers wireless client traffic to the RAP for transfer to the wired network.
Lightweight access point protocol (LWAPP) control traffic is also transferred over this bridged link.
Figure 4 Access Point Backhaul Example
Point-to-Point Bridging
The access points can be used to extend a remote network by using the 5-GHz backhaul radio to bridge
the two network segments as shown in Figure 5. To support Ethernet bridging, you must enable
bridging on the controller for each access point.
Wireless client access is supported; however, if bridging between tall buildings, the 2.4-Ghz wireless
coverage area may be limited and possibly not suitable for direct wireless client access.
148438
(5.8 Ghz) (2.4 Ghz)

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Figure 5 Point-to-Point Bridging Example
Point-to-Multipoint Bridging
The access points can be used as a RAP to connect multiple remote MAPs with their associated wired
networks. By default this capability is turned-off for all access points. To support Ethernet bridging,
you must enable bridging on the controller for each access point. Wireless client access can be provided
over the bridging link; however, if bridging between tall buildings, the 2.4-Ghz wireless coverage area
may be limited and possibly not suitable for direct wireless client access.
Figure 6 illustrates an example of access point-to-multipoint bridging.
Figure 6 Point-to-Multipoint Bridging Example
148440
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Mesh Network
The access point is typically deployed in a mesh network configuration. In a typical mesh deployment,
one or more RAPs have a wired network connection through a switch to a controller. Other remote
MAPs without wired network connections use the backhaul feature to optimally link to a RAP that is
connected to the wired network. In the mesh network, the links between the access points are referred
to as the backhaul links.
Intelligent wireless routing is provided by the patent-pending Adaptive Wireless Path protocol
(AWPP). This enables each MAP to identify its neighbors and intelligently choose the optimal path to
the RAP with the wired network connection by calculating the cost of each path in terms of signal
strength and the number of hops required to get to a controller with signal strength given priority since
signal strength determines the bandwidth available for backhaul.
Figure 7 illustrates a typical mesh configuration using MAPs and RAPs.
Figure 7 Typical Mesh Configuration Using MAPs and RAPs
148441
WCS
Network
RAP
MAP 1 MAP 2 MAP 3
MAP 4 MAP 6
MAP 5
MAP 7 MAP 8 MAP 9

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Layer 3 Network Operation
The access points support Layer 3 network operation. Access points and controllers in Layer 3
configurations use IP addresses and UDP packets, which can be routed through large networks.
Layer 3 operation is scalable and recommended by Cisco. Figure 8 illustrates a typical Layer-3 wireless
network configuration containing access points and a controller.
Figure 8 Typical Layer 3 Access Point Network Configuration Example
6 Preparing the Access Point
The access point is a radio device which is susceptible to common causes of interference that can
reduce throughput and range. Follow these basic guidelines to ensure the best possible performance:
•For information on planning and initially configuring your Cisco mesh network, refer to the Cisco
Mesh Networking Solution Deployment Guide or the Cisco Aironet 1500 Series Wireless Mesh
AP Design Guide. These documents are available on cisco.com.
•Do not install the access point in an area where structures, trees, or hills obstruct radio signals to
and from the access point.
•You can install the access point at any height, but best throughput is achieved when the access
points are mounted at the same height.
Note To perform path loss calculation and to determine how far apart to install access points,
consult an RF planning expert.
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Site Surveys
Cisco recommends that you perform a site survey before installing the equipment. A site survey reveals
problems that can be resolved before the network is operational. Because 802.11a is unlicensed, there
may be sources of interference from other 802.11a wireless devices (especially in multi-tenant
buildings) that could degrade your 802.11 signals. A site survey can determine if such interference
exists.
A proper site survey involves temporarily setting up mesh links and taking measurements to determine
whether your antenna calculations are accurate. Determine the correct locations and antenna types
before you drill holes and route cables and mounting equipment.
Tip When power is not readily available during a site survey, use an unrestricted power supply
(UPS) to temporarily power the mesh link.
Consider the following operating and environmental conditions when performing a site survey:
•How far is your wireless link?
•Has a previous site survey been conducted?
•Do you have a clear Fresnel zone between the access points or radio line of sight?
•What is the minimum acceptable data rate within the link?
•Do you have the correct antenna?
•Do you have access to both of the mesh site locations?
•Do you have the proper permits, if required?
•Do you have a partner? Never attempt to survey or work alone on a roof or tower.
•Have you configured the access points before you go onsite? It is always easier to resolve
configurations or device problems first.
•Do you have the proper tools and equipment to complete your survey?
Avoiding Damage to Radios in a Testing Environment
The radios on outdoor units (bridges) have higher transmit power levels than radios on indoor units
(access points). When you test high power radios in a link, you must avoid exceeding the receiver’s
maximum receive input level. At levels higher than the normal the receiver’s operating range, packet
error rate (PER) performance is degraded. At even higher levels, the receiver can be permanently
damaged.