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Reference Guide
Aironet
Antennas
Cisco
Overview
Executive Overview
This antenna reference guide is intended to provide information to assist in understanding the
®
issues and concerns of antennas used with a Cisco Aironet
Wireless LAN system, or Wireless
Bridge system. It details deployment and design, limitations, and capabilities, and basic
theories of antennas. This document also contains information on the Cisco antennas and
accessories as well as installation scenarios, regulatory information, and technical
specifications and diagrams of the available antennas.
Overview of Antennas
Each Cisco Aironet radio product is designed to perform in a variety of environments.
Implementing the antenna system can greatly improve coverage and performance. To optimize
the overall performance of a Cisco wireless LAN, it is important to understand how to
maximize radio coverage with the appropriate antenna selection and placement. An
antenna system comprises numerous components, including the antenna, mounting hardware,
connectors, antenna cabling, and in some cases, a lightning arrestor. For additional consultation,
please contact your authorized Cisco Aironet partner. Cisco Partners can provide onsite
engineering assistance for complex requirements.
Cisco Systems, Inc.
All contents are Copyright © 2003 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement.
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Summary of Contents for Cisco Aironet AIR-ANT3351
- Page 1 Cisco Aironet partner. Cisco Partners can provide onsite engineering assistance for complex requirements. Cisco Systems, Inc. All contents are Copyright © 2003 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Page 1 of 29...
- Page 2 2.4GHz Spectrum The Cisco Aironet 350 Series uses RF spectrum in the 2.4 GHz unlicensed ISM band. In the U.S., three bands are defined as unlicensed and known as the ISM bands (Industrial, Scientific, and Medical). The ISM bands are as follows: •...
- Page 3 Type of Antennas Cisco offers several different styles of antennas for use in the 2.4GHz ranges. Every antenna offered for sale has been FCC approved. Each type of antenna will offer different coverage capabilities. As the gain of an antenna increases, there is some tradeoff to its coverage area.
- Page 4 Diversity antenna systems are used to overcome a phenomenon known as multipath distortion of multipath fading. It uses two identical antennas, located a small distance apart, to provide coverage to the same physical area. Cisco Systems, Inc. All contents are Copyright © 2003 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Page 4 of 29...
- Page 5 FH systems, it drastically effects the ability to handle multipath issues, further reducing its range compared to present DS systems in high RF reflective sites. Cisco Systems, Inc. All contents are Copyright © 2003 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Page 5 of 29...
- Page 6 LAN infrastructure or by using the wireless repeater functionality built into every Cisco Aironet Access Point. All Cisco Aironet Wireless LAN products are designed to support complex multicell environments transparently through the Cisco patented MicroCellular Architecture.
- Page 7 While it is a low loss cable, it should still be kept to a minimum length. This cable is the only cable type supplied by Cisco for mounting the antenna away from the radio unit. It is offered in four different lengths with one RTNC plug and one RTNC jack connector attached.
- Page 8 Theory of Operation The Cisco Aironet Lightning Arrestor prevents energy surges from reaching the RF equipment by the shunting effect of the device. Surges are limited to less than 50 volts, in about .0000001 seconds (100 nano seconds). A typical lightning surge is about .000002 (2 micro seconds).
- Page 9 30 dB 1000 x -30 dB 0.001 x 40 dB 10,000 x -40 dB 0.0001 x Cisco Systems, Inc. All contents are Copyright © 2003 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Page 9 of 29...
- Page 10 -40 dBm 0.0001 mW 1. The 1, 2, 5, 20, 50, and 100 mW transmit power settings for the Cisco Aironet 350 Series radios correspond to 0, 3, 7, 13, 17, and 20 dBm. Outdoor Range The range of a wireless link is dependent upon the maximum allowable path loss. For outdoor links this is a straightforward calculation as long as there is clear line of sight between the two antennas with sufficient clearance for the Fresnel zone.
- Page 11 (Earth Curvature) ft. with no obstructions Cisco.com provides an Outdoor Bridge Range Calculation Utility that calculates the Fresnel zone and maximum range based upon cable types and lengths; transmitter and receiver models; and antennas. The utility can be found at: www.cisco.com/go/aironet/calculation.
- Page 12 Transmitter means 9dBi antenna, 28dB transmitter means 12dBi antenna). Because we are operating at 20dBm, which is 10dB below the 30dBm level, we can increase the out antenna by 30dB. However Cisco has never tested, and therefore is not certified with any antenna larger than 21dBi.
- Page 13 (but only 11 Mbps to a single client). The channel allocation scheme is illustrated in Figure 9. Cisco Systems, Inc. All contents are Copyright © 2003 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Page 13 of 29...
- Page 14 2447 2452 2457 – 2462 – 2467 – – 2472 – – 2484 – – – Cisco Systems, Inc. All contents are Copyright © 2003 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Page 14 of 29...
- Page 15 “squint” or beam-tilt. It is designed to be mounted on a round mast. Cisco Systems, Inc. All contents are Copyright © 2003 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Page 15 of 29...
- Page 16 Provides lightning and related energy surges at the antenna from reaching the radio circuitry. A ground ring is included. Cisco Systems, Inc. All contents are Copyright © 2003 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Page 16 of 29...
- Page 17 Antenna Connector MMCX (2) Dimensions (H x W x D) 6.5 x 7.0 x 2.12 in. Cisco Systems, Inc. All contents are Copyright © 2003 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Page 17 of 29...
- Page 18 Dimensions (H x W x D) 5.3 x 2.8 x 0.9 in. Mounting Drop ceiling cross member mount Cisco Systems, Inc. All contents are Copyright © 2003 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Page 18 of 29...
- Page 19 RP-TNC Dimensions (H x W x D) 6.65 x 4.78 x .82 in. Mounting Wall mount Cisco Systems, Inc. All contents are Copyright © 2003 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Page 19 of 29...
- Page 20 25 degrees Antenna Connector RP-TNC Dimensions (H x W x D) 12 x 5 x 1 in. Cisco Systems, Inc. All contents are Copyright © 2003 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Page 20 of 29...
- Page 21 Antenna Connector RP-TNC Dimensions (H x W) 9 x 1.25 in. Mounting Drop ceiling cross member—indoor only Cisco Systems, Inc. All contents are Copyright © 2003 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Page 21 of 29...
- Page 22 70 degrees Antenna Connector RP-TNC Dimensions (H x W x D) See Drawing Mounting Wall mount Cisco Systems, Inc. All contents are Copyright © 2003 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Page 22 of 29...
- Page 23 RP-TNC Dimensions (H x W x D) 4.88 x 4.88 x .6 in. Mounting Wall mount Cisco Systems, Inc. All contents are Copyright © 2003 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Page 23 of 29...
- Page 24 70 degrees Antenna Connector RP-TNC Dimensions (H x W x D) See Drawing Mounting Wall mount Cisco Systems, Inc. All contents are Copyright © 2003 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Page 24 of 29...
- Page 25 50 degrees Antenna Connector RP-TNC Dimensions (H x W) 11.5 x 1.125 in. Mounting Mast mount—indoor/outdoor Cisco Systems, Inc. All contents are Copyright © 2003 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Page 25 of 29...
- Page 26 7 degrees Antenna Connector RP-TNC Dimensions (H x W) 40 x 1.25 in. Wind Rating 100MPH Cisco Systems, Inc. All contents are Copyright © 2003 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Page 26 of 29...
- Page 27 25 degrees Antenna Connector RP-TNC Dimensions (H x W) 18 x 3 in. Wind Rating 110MPH Cisco Systems, Inc. All contents are Copyright © 2003 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Page 27 of 29...
- Page 28 12.4 degrees Antenna Connector RP-TNC Dimensions (H x W) 24 x 15.5 in. Wind Rating 110MPH Cisco Systems, Inc. All contents are Copyright © 2003 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Page 28 of 29...
- Page 29 U.S. and certain other countries. All other trademarks mentioned in this document or Web site 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.