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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

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

Cisco Aironet Dual Band MIMO Low Profile Ceiling Mount Antenna (AIR-ANT2451NV-R)

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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

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.

Cisco Aironet Dual Band MIMO Low Profile Ceiling Mount Antenna (AIR-ANT2451NV-R)

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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.

Cisco Aironet Dual Band MIMO Low Profile Ceiling Mount Antenna (AIR-ANT2451NV-R)

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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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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

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

Cisco technical documentation as an RSS feed and delivers content directly to your desktop using a

reader application. The RSS feeds are a free service.

Cisco and the Cisco logo are trademarks or registered trademarks of Cisco and/or its affiliates in the U.S. and other countries. To view a list of

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.

Cisco Aironet Dual Band MIMO Low Profile Ceiling Mount Antenna (AIR-ANT2451NV-R)

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