Cisco AIR-ANT2451NV-R Quick start guide

Cisco Systems, Inc.
www.cisco.com
Cisco Aironet Dual Band MIMO Low Profile
Ceiling Mount Antenna (AIR-ANT2451NV-R)
This document outlines the specifications for the AIR-ANT2451NV-R dual band MIMO low profile
ceiling mount antenna and provides instructions for mounting it. The antenna operates in the 2.4- and
5-GHz frequency ranges and is designed for indoor use.
The following information is provided in this document.
•Technical Specifications, page 2
•System Requirements, page 5
•Safety Precautions, page 5
•Installation Notes, page 5
•Installing the Antenna, page 6
•Obtaining Documentation and Submitting a Service Request, page 9

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Technical Specifications
Technical Specifications
Antenna type 6-element
Omnidirectional
Operating frequency
range
2400–2500 MHz
5150–5850 MHz
Nominal input
impedance
50 Ohms
VSWR 2:1 or less
(both bands)
Peak gain 2.4 GHz 2.5 dBi
Peak gain 5 GHz 3.5 dBi
Polarization Linear
Azimuth plane
(3 dB beamwidth)
Omnidirectional
Elevation plane 2.4 GHz
(3 dB beamwidth)
63°
Elevation plane 5 GHz
(3 dB beamwidth
55°
Diameter 8.6 in (21.8 cm)
Thickness 1.8 in (4.6 cm)
Cable 3 ft (91.4 cm) plenum
rated (blue markers
indicate 5 GHz
antennas)
Connector RP-TNC plug
Environment Indoor only
Operating temperature 32° F to 131° F
(0° C to 55° C)
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Technical Specifications
2.4-GHz Antenna #1 Azimuth and Elevation Patterns 5-GHz Antenna #1 Azimuth and Elevation Radiation
Patterns

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Technical Specifications
2,4-GHz Antenna #2 Azimuth and Elevation Patterns 5-GHz Antenna #2 Azimuth and Elevation Radiation
Patterns
2.4-GHz Antenna #3 Azimuth and Elevation Patterns 5-GHz Antenna #3 Azimuth and Elevation Radiation
Patterns

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System Requirements
System Requirements
This antenna is designed for indoor use with Cisco Aironet 802.11N radio devices that use six RP-TNC
connectors (three 2.4-GHz and three 5-GHz).
Safety Precautions
Translated versions of the following safety warnings are provided in the Safety Warnings for Cisco
Aironet Antennas, which is available at http://www.cisco.com.
For your safety, and to help you achieve a good installation, please read and follow these safety
precautions. They may save your life!
1. If you are installing an antenna for the first time, for your own safety as well as others, seek
professional assistance. Your Cisco sales representative can explain which mounting method to use
for the size and type antenna you are about to install.
2. Select your installation site with safety as well as performance in mind. Remember: electric lines
and phone lines look alike. For your safety, assume that any line can kill you.
3. Call your electric power company. Tell them your plans and ask them to come look at your proposed
installation. This is a small inconvenience considering your life is at stake.
4. If any part of the antenna system should come in contact with an electric line, don’t touch it or try
to remove it yourself. Call your local power company. They will remove it safely.
5. If an accident occurs with the electric lines, call for qualified emergency help immediately.
Installation Notes
Antennas transmit and receive radio signals which are susceptible to RF obstructions and common
sources of interference that can reduce throughput and range of the device to which they are connected.
Follow these guidelines to ensure the best possible performance:
•Keep the antenna away from metal obstructions such as heating and air-conditioning ducts, large
ceiling trusses, building superstructures, and major power cabling runs. If necessary, use a rigid
conduit to lower the antenna away from these obstructions.
•The density of the materials used in a building’s construction determines the number of walls the
signal can pass through and still maintain adequate signal strength. Consider the following before
choosing the location for your antenna:
– Signals penetrate paper and vinyl walls with little change to signal strength.
– Signals penetrate only one or two solid and pre-cast concrete walls without degrading signal
strength.
– Signals penetrate three or four concrete and wood block walls without degrading signal
strength.
– Signals penetrate five or six walls constructed of drywall or wood without degrading signal
strength.
– Signals will likely reflect off a thick metal wall and may not penetrate it at all.
– Signals will likely reflect off a chain link fence or wire mesh spaced between 1 and 1 1/2 in.
(2.5 and 3.8 cm). The fence acts as a harmonic reflector that blocks the signal.

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Installation Notes
•Install the antenna away from microwave ovens and 2-GHz cordless phones. These products can
cause signal interference because they operate in the same frequency range as the device to which
your antenna is connected.
Choosing a Mounting Location
The antenna should be mounted clear of any obstructions to the sides of the radiating elements.
Generally, the higher an antenna is above the floor, the better it performs. If possible, find a mounting
place directly above your wireless device to ensure that any additional lead-in cable can be as short as
possible.
Tools and Equipment Required
You need the following tools and equipment, which are not provided.
•A suitable hole cutter capable of creating a 1-in. (2.54-cm) hole in a suspended ceiling tile.
Note We recommend a hole saw, which is available in most home improvement centers and hardware
stores.
•A step ladder high enough to access your ceiling safely.
Installing the Antenna
The antenna is installed to a suspended ceiling tile with a supplied 1 in. (2.54-cm) plastic nut. See
Figure 1 for details.
The antenna terminates with an RP-TNC connector after a short, 3-ft. (91-cm) cable. The mating
connector to the antenna is an appropriate RP-TNC connector.

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Installation Notes
Mounting the Antenna on a Ceiling Tile
Figure 1 Ceiling Tile Mounting Details
Follow these steps to mount the antenna on a suspended ceiling tile.
Step 1 Mark the location on the ceiling tile where you will mount the antenna.
Step 2 Remove the ceiling tile from the ceiling grids.
Step 3 Use a hole cutter to create a a 1-in. (2.54-cm) hole in the ceiling tile.
Step 4 Insert the antenna cables, one at a time, through the hole in the ceiling tile.
Step 5 Line up the plastic nut and washer as shown in Figure 1.
Step 6 Insert the antenna cables, one at a time, through the hole in the plastic nut.
Note Do not use the rubber washer when you mount the antenna on a ceiling tile. The washer is not
required for ceiling tile installations.
Step 7 Make sure that the antenna is properly positioned on the ceiling tile and then tighten the plastic nut
hand-tight as shown in Figure 2.
1Plastic nut 3Ceiling tile
2Antenna cables 4Antenna
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2
3
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Installation Notes
Figure 2 Ceiling Tile Finished Installation
Step 8 Reinstall the ceiling tile.
Step 9 Connect the antenna cables to the access point.
Note The 5-GHz antenna cables are identified by a blue collar near the connectors. Make sure that you
connect these cables to the 5-GHz antenna connection on the access point.
Suggested Cable
Cisco recommends a high-quality, low-loss cable for use with the antenna.
Note Coaxial cable loses efficiency as the frequency increases, resulting in signal loss. The cable should be
kept as short as possible because cable length also determines the amount of signal loss (the longer the
run, the greater the loss).
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Obtaining Documentation and Submitting a Service Request
Obtaining Documentation and Submitting a Service Request
For information on obtaining documentation, using the Cisco Bug Search Tool (BST), submitting a
service request, and gathering additional information, see What’s New in Cisco Product Documentation
at: http://www.cisco.com/c/en/us/td/docs/general/whatsnew/whatsnew.html.
Subscribe to What’s New in Cisco Product Documentation, which lists all new and revised
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Cisco trademarks, go to this URL: www.cisco.com/go/trademarks. Third-party trademarks mentioned are the property of their respective owners. The
use of the word partner does not imply a partnership relationship between Cisco and any other company. (1110R)
Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any
examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only.
Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.
© 2011 Cisco Systems, Inc. All rights reserved.

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