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Table of Contents
Summary of Contents for Cabletron Systems RoamAbout 802.11
- Page 1 RoamAbout 802.11 Outdoor Antenna Site Preparation Guide 9033153...
- Page 3 Notice Notice Cabletron Systems reserves the right to make changes in specifications and other information contained in this document without prior notice. The reader should in all cases consult Cabletron Systems to determine whether any such changes have been made.
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Page 5: Table Of Contents
Table of Contents Overview ...1 Requirements ...2 Lightning protection...2 Grounding system ...2 Line of sight ...2 Factors that can reduce antenna range ...5 Required Data for Antenna Installation Company...6 The Fresnel Zone ...6 Other Considerations...8 Antenna Options...9 RoamAbout 14-dBi Directional Antenna ...9 RoamAbout 7-dBi Omni-Directional Antenna ...13 Verify Component Connector Polarity...15 Reviewing the Site Preparation Checklist...16... -
Page 7: Overview
Site Preparation Guide Overview This guide describes the site requirements that are needed for the successful installation of RoamAbout Outdoor Antennas. It is intended for sales engineers or site evaluators. The outdoor antenna uses RF antenna technology, which lets you extend your LAN from building to building. -
Page 8: Requirements
Site Preparation Guide Requirements Lightning protection A lightning rod must be placed close to the antenna mast or wall bracket. This is required to protect the antenna from direct lightning strikes. Grounding system Direct earth grounding of the antenna and the lightning arrestor is necessary to protect the installation from lightning and the build-up of static electricity. - Page 9 Antenna height requirements (mast): At least 5 feet (1.5 meters) above the roof line if you are mounting it on a roof. High enough to achieve a line of sight if you are mounting it on the wall of a building.
- Page 10 Site Preparation Guide Figure 2: Potential Obstacles to Line of Sight (not to scale) Building blocking line of sight Power lines blocking line of sight 100_02 Trees blocking line of sight...
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Page 11: Factors That Can Reduce Antenna Range
Site Preparation Guide Figure 3: Large Reflecting Surfaces 100_03 Large storage tanks which are common in industrial areas Factors that can reduce antenna range Large reflecting surfaces that are parallel or partly perpendicular to the radio signal cause reflections of the radio signal. Examples of reflecting surfaces are buildings with low-emissivity (low-e) glass, crowded parking lots, water, moist earth, moist vegetation, and above-ground power or telephone lines. -
Page 12: Required Data For Antenna Installation Company
Site Preparation Guide Required Data for Antenna Installation Company The Fresnel Zone You need a clear line-of-sight between antennas to set up an outdoor installation that meets your requirements in terms of range and throughput performance. NOTE The shape of the radio beam, also defined as the Fresnel Zone, is bulged in the middle. The exact shape and width of the Fresnel Zone is determined by the path length and frequency of the radio signal. - Page 13 Figure 4: Fresnel Zone Cable Length Refer to the following table to determine the minimum clearance required for your installation as defined by the distance between the antennas. Distance Between Antennas (1) kilometers (miles) (1.3) (2.2) (4.0) (6.0) Site Preparation Guide Cable Length 2844-01-03A...
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Page 14: Other Considerations
Site Preparation Guide Other Considerations The strength of each transmitted signal must be considered when planning your antenna installation. Two parameters are usually listed to indicate transmitted signal strength: output power of the radio transmitter, and gain of the antenna system. •... -
Page 15: Antenna Options
Antenna Options RoamAbout 14-dBi Directional Antenna The RoamAbout 14-dBi Directional Antenna is a high-gain antenna for the 2.4 GHz frequency band. The antenna is a totally enclosed 16-element Yagi designed for point-to-point communications. It has a typical VSWR of 1.5:1 and is less than 2:1 over the entire frequency band. The gain is 14-dBi and the half-power beamwidth is 30 degrees. - Page 16 Site Preparation Guide Mechanical • Size • Mounting Method Cable • Type • Length • Color Connector • FCC Countries • ETSI Countries • France • Japan Electrical • Frequency Range • VSWR • Nominal Impedance • Gain • Front-to-Back Ratio •...
- Page 17 Figure 5: Typical Outdoor Yagi Configuration Low Loss Cable (2) Wall Mount Enclosure (3) Pigtail Connection (4) Access Point (5) Adapter Card (6) Cabletron Systems Lightning Protector (7) Power Transformer (included with Access Point) Ethernet Power Connection Connection Site Preparation Guide Antenna (1) OUTDOOR INDOOR...
- Page 18 Site Preparation Guide The following lists components and part numbers typically used in an outdoor antenna configuration. Refer to the RoamAbout web site listed on page iii for the latest information. Packaged Kit/ Component OUTDOOR ANTENNA KIT Contents: Antenna 50’ Low-Loss Cable Wall Mount Enclosure CSIAP-WM Pigtail Connection Access Point...
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Page 19: Roamabout 7-Dbi Omni-Directional Antenna
RoamAbout 7-dBi Omni-Directional Antenna The RoamAbout 7-dBi Omni-Directional Antenna is a broadband antenna for the 2.4 GHz frequency band featuring an omni-directional pattern with a nominal gain of 7 dBi. This antenna is encapsulated in a weatherproof protective covering. With the hardware provided, this vertically-polarized antenna can be mounted on an antenna mast with an outside diameter of up to 51mm (2 in). - Page 20 Site Preparation Guide Figure 6: Low Loss Cable (2) Wall Mount Enclosure (3) Pigtail Connection (4) Access Point (5) Adapter Card (6) 7-dBi Omni-Directional Antenna Low-Loss Cable: 6m (20 ft), 15m (50 ft), or 22m (75 ft) Wall Mount Enclosure Pigtail Connection Access Point Adapter Card...
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Page 21: Verify Component Connector Polarity
Verify Component Connector Polarity The components supplied with your Outdoor Antenna Kit are configured with either Standard-N connectors or Reverse Polarity-N connectors, subject to the country where the kit was purchased. Refer to the following table to verify that the polarity of each connector is correct for your installation. -
Page 22: Reviewing The Site Preparation Checklist
Site Preparation Guide Reviewing the Site Preparation Checklist Lightning protection Determine the mounting location for the lightning rod (positioned near the antenna). Ensure an earth ground location for the antenna structure and lightning arrestor. Mounting requirements Determine the type of mounting that is required (tripod, wall mount, etc.) Consider that three guy wires are needed for each 10-foot (3 meter) section of the mast;... -
Page 23: For Additional Assistance
Phone Internet mail Login Password To send comments or suggestions concerning this document, contact the Cabletron Systems Technical Writing Department via the following email address: TechWriting@cabletron.com Make sure to include the document Part Number in the email message. http://www.cabletron.com http://www.cabletron.com/wireless (603) 332-9400 http://www.cabletron.com/support/forms...