MP-622 Installation Guide Trapeze Networks, Inc. 5753 W. Las Positas Blvd. Pleasanton, CA 94588 Tel: +1 925-474-2200 Fax: +1 925-251-0642 Toll-Free: 877-FLY-TRPZ (877-359-8779 For the most current version of all documentation, go to www.trapezenetworks.com Part Number: 730-9502-0270 Rev.
Trapeze Networks Trapeze Networks, Inc. 5753 W. Las Positas Blvd. Pleasanton, CA 94588 Tel: +1 925-474-2200 Fax: +1 925-251-064233 Toll-Free: 877-FLY-TRPZ (877-359-8779) http://www.trapezenetworks.com © 2008 Trapeze Networks, Inc. All rights reserved.
Table of Contents About This Guide Trapeze Networks Mobility System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i-i Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i-i Planning, Configuration, and Deployment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i-ii Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents MX Appliance Recommendation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 Weather Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 Ethernet Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents Chapter 5 Cables and Pinouts Twisted-Pair Cable Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 10/100BASE-TX Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 Straight-Through Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2 Crossover Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents iv MP-622 Installation Guide
About This Guide This guide details how to install a Trapeze Networks™ Mobility Point™ (MP™) access point, model MP-622, in a Trapeze Networks Mobility System™ wireless LAN (WLAN). The MP-622 is suitable for installation outdoors.
About This Guide Trapeze Networks Mobility System Indoor Mobility Point Installation Guide — Instructions and specifications for installing an MP access point and connecting it to an MX. Mobility Point MP-622 Installation Guide (this document) — Instructions and specifications for installing the MP-622 access point and connecting it to an MX. Regulatory Information— Important safety instructions and compliance information that you must read before installing Trapeze Networks products.
About This Guide Trapeze Networks Mobility System Text and Syntax Conventions Trapeze guides use the following text and syntax conventions: Convention Use Monospace text Sets off command syntax or sample commands and system responses. Bold text Highlights commands that you enter or items you select. Italic text Designates command variables that you replace with appropriate values or highlights publication titles or words requiring special emphasis.
About This Guide Warranty and Software Licenses Software version(s) and release number(s) Output of the show tech-support command Wireless client information License levels for RingMaster™ and Mobility Exchange™ (MX™) products Description of any problems and status of any troubleshooting effort Warranty and Software Licenses Current Trapeze Networks warranty and software licenses are available at http://www.trapezenetworks.com/support/warranty.
About This Guide Warranty and Software Licenses original shipment by Trapeze Networks to Customer or (b) if the software was purchased from a Trapeze Networks Authorized Reseller, for a period of ninety (90) days from the date of delivery to Customer commencing not more than ninety (90) days after original shipment date by Trapeze), (“Limited Hardware Warranty”). The date of original shipment from Trapeze Networks will be determined by shipping evidence on file at Trapeze Networks.
About This Guide Warranty and Software Licenses CONTRACT, TORT, NEGLIGENCE, OR OTHERWISE, AND SHALL APPLY EVEN IF THE LIMITED WARRANTY FAILS OF ITS ESSENTIAL PURPOSE. WARRANTY LAWS VARY FROM JURISDICTION TO JURISDICTION, AND THE ABOVE LIMITATIONS AND EXCLUSION OF CONSEQUENTIAL AND INCIDENTAL DAMAGES MAY NOT APPLY TO YOU, DEPENDING UPON YOUR STATE, COUNTRY OR JURISDICTION. 8.
1 1 MP-622 Overview A Trapeze Networks Mobility Point (MP) model MP-622 provides IEEE 802.11 wireless access to the network. MP access points are designed for use with a Trapeze Networks Mobility Exchange (MX). MPs require hardware installation only. All configuration for an MP is performed on the MX. Warning! Installation must be performed by qualified service personnel only. Read and follow all warning notices and instructions marked on the product or included in the documentation.
Package Checklist The MP-622 package includes: One MP-622 Mobility Point (MP) XPS-6201-OUT or XPS-6202-OUT Optional: Lightning protector for outdoor antenna Contact Trapeze Networks if there are any incorrect, missing or damaged parts. If possible, retain the carton, including the original packing materials. Use them again to repack the product in case there is a need to return it. External Hardware Features Figure 1–1. MP Access Point Model MP-622—Bottom View Figure 1–2.
LED Indicators The LEDs are used for RSSI signal strength measurements to aim directional antennas and to indicate the state of the AP. The access point includes eight status LED indicators, as shown below. The LEDs are viewed right to left as you look at the back of the MP. 802.11b/g Wireless Link/Activity 11b/g 11a Power Power Link Ethernet Link/Activity 802.11a Wireless Link/Activity The table below describes the system status LEDs.
The table below describes the wireless status LEDs in RSSI mode. LED Status Description 11a (three LEDs) Off No signal detected or the 802.11a radio is disabled. Slow Flashing Green The 802.11a radio is enabled with a low level signal. Fast Flashing Green Indicates a medium level signal. On Green Indicates a high level signal. Off No signal detected or the 802.11b/g radio is disabled. 11b/g (three LEDs) Slow Flashing Green The 802.11b/g radio is enabled with a low level signal.
The wireless bridge appears as an Ethernet node and performs a bridging function by moving packets from the wired LAN to the remote end of the wireless bridge link. Note: The power injector module does not support Power over Ethernet (PoE) based on the IEEE 802.3af standard. The wireless bridge unit must always be powered on by being connected to the power injector module. Power Injector Module The MP-622 receives power through the network cable connection using Power-over-Ethernet (PoE) technology.
Water Tight Test Point Do not remove or loosen this screw. If you do, you can damage the unit. Warning! Wall- and Pole-Mounting Bracket Kits The MP-622 includes bracket kits that can be used to mount the unit to a wall, pole, radio mast, or part of a tower structure. Lightning Protector for Outdoor Antenna If you are using the MP-622 with an outdoor antenna, Trapeze Networks strongly recommends installing an external lightning protector for the antenna.
Security through 64/128/152-bit Wired Equivalent Protection (WEP) or 128-bit Advanced Encryption Standard (AES) encryption Scans all available channels and selects the best channel and data rate based on the signal-to-noise ratio. Manageable through an easy-to-use web-browser interface, command line (via Telnet), or SNMP network management tool.
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2 2 MP-622 Network Configurations This chapter illustrates network configurations supported for the MP-622. Infrastructure Configuration In an infrastructure topology, the MP-622 provides access to a wired LAN for 802.11a/b/g wireless workstations. Since the MP-622 has a weatherproof casing, it can be installed outdoors (for example, on a pole) to provide network access to clients located outside. Figure 2–1.
WLAN Mesh Configuration WLAN mesh services allow an MP to provide wireless services to clients without a wired interface for the MP. Instead of a wired interface, the MP has a radio link to another MP with a wired interface. WLAN mesh services can be used at sites where running Ethernet cable to a location is inconvenient, expensive or impossible. Note that power must be available at the location where the Mesh AP is installed.
Wireless Bridge Configuration You can use WLAN mesh services in a wireless bridge configuration, with MP-622 units serving as bridge endpoints in a transparent Layer 2 bridge. A typical application of wireless bridging is to provide network connectivity between two buildings using a wireless link, as shown in the following illustration. Figure 2–3.
Figure 2–4.
3 3 Installing and Connecting an MP-622 Note: Before installing an MP, you might need to generate a network plan and an MP work order with RingMaster. (See RingMaster Network Plan and Work Orders below.) Installation Requirements and Recommendations For best results, follow these requirements and recommendations before installing an MP-622.
Installing and Connecting an MP-622 Installation Requirements and Recommendations Rain — The MP-622 is weatherproofed against rain. Also, prolonged heavy rain has no significant effect on the radio signal. However, it is recommended to apply weatherproof sealing tape around the Ethernet port and antenna connectors for extra protection. If moisture enters a connector, it may cause a degradation in performance. Snow and Ice — Falling snow, like rain, has no significant effect on the radio signal.
Installing and Connecting an MP-622 Installing an MP-622 Installing an MP-622 The MP-622 includes a bracket kit for mounting the unit to a 1.5 to 2 inch diameter steel pole or tube. The pole-mounting bracket allows the unit to be mounted to part of a radio mast or tower structure. The unit also has a wall-mounting bracket kit that enables it to be installed on a building wall or roof when using external antennas. Hardware installation of the MP-622 involves these steps: 1.
Installing and Connecting an MP-622 Installing an MP-622 1. Place the V-shaped part of the bracket around the pole and tighten the securing nuts just enough to hold the bracket to the pole. (The bracket may need to be rotated around the pole during the alignment process.) Figure 3–1. Attaching the Bracket to the Pole 2. Fit the edges of the V-shaped part into the slots in the rectangular plate, and use the included nuts to tightly secure the MP-622 to the bracket.
Installing and Connecting an MP-622 Installing an MP-622 3. Attach the adjustable rectangular plate to the bridge with supplied screws. 4. Attach the bridge with bracket to the plate already fixed to the pole. 5. Use the included nuts to secure the wireless bridge to the pole bracket. Note that the wireless bridge tilt angle may need to be adjusted during the antenna alignment process. Be sure to take account of the antenna polarization direction.
Installing and Connecting an MP-622 Installing an MP-622 Mounting on Larger Diameter Poles There is also a method for attaching the pole-mounting bracket to a pole that is 2 to 5 inches in diameter using an adjustable steel band clamp (not included in the kit). A steel band clamp up to 0.5 inch (1.27 cm) wide can be threaded through the main part of the bracket to secure it to a larger diameter pole without using the U-shaped part of the bracket. This method is illustrated in the following figure.
Installing and Connecting an MP-622 Installing an MP-622 3. Drill four holes in the wall that match the screws and wall plugs included in the bracket kit, then secure the bracket to the wall. 4. Use the included nuts to tightly secure the MP-622 to the bracket. Connecting External Antennas For some applications, when deploying an MP-622, you must mount external antennas and connect them to the unit. Typically, access point operation requires a 2.4 GHz antenna, and bridge link operation requires a 5.
Installing and Connecting an MP-622 Installing an MP-622 b. Attach the ground-wire terminal lug, lock washer, and hex nut to the lightning arrestor, in the order shown in Figure 3–4 below. Note: To meet regulatory requirements, you must ensure that the external antenna specified with the set ap radio antennatype command exactly matches the external antenna attached to the MP-622 external antenna port. Figure 3–4.
Installing and Connecting an MP-622 Installing an MP-622 Figure 3–5. Connecting External Antennas to the MP-622 2.4 GHz N-type Connector 5 GHz External High-gain Panel Antenna 5 GHz N-type Connector 2.4 GHz External Omnidirectional Antenna RF Coaxial Cable Connecting Cables to the Unit 1. Attach the Ethernet cable to the Ethernet port on the MP-622. 2. For extra protection against rain or moisture, apply weatherproofing tape (not included) around the Ethernet connector. 3.
Installing and Connecting an MP-622 Installing an MP-622 Figure 3–6. Attaching an Ethernet Cable to the MP-622 Connecting the Outdoor Power Supply For instructions on connecting the outdoor power supply to the MP-622, refer to Installing an Outdoor Power Supply (Model XPS-620x-OUT). Be sure to contact a fully qualified electrician to perform the installation.
Installing and Connecting an MP-622 Installing an MP-622 1. Connect the Ethernet cable from the wireless bridge to the RJ-45 port labeled “Output” on the power injector. 2. Connect a straight-through unshielded twisted-pair (UTP) cable from a local LAN switch to the RJ-45 port labeled “Input” on the power injector. Use Category 5e or better UTP cable for 10/ 100BASE-TX connections. Warning! You must align the UTP cable with the pins in the RJ-45 “Input” port.
Installing and Connecting an MP-622 Installing an MP-622 When the bridge is connectedd to power, the LEDs indicate as follows: LED Power Link 11a (Three LEDs) 11g (Three LEDs) Color Indicates Green The bridge is powered up and operating normally. Off The bridge is not receiving power or there is a fault with the power supply. Amber The system is under cold reset status. Green The bridge has a 10/100 Mbps Fast Ethernet connection, but there is no activity.
Installing and Connecting an MP-622 Installing an MP-622 Figure 3–7. 10/100 Cat 5 Cable Installation 1. Insert a Cat 5 cable with a standard RJ-45 connector as shown in Figure 3–7. For connection to an MP, use a straight-through cable. 2. When the link is activated, observe the MP LED for the port on the MX: MX Port LEDs for MP Connections Meaning Solid green For an MP access point active link, all the following are true: MP has booted. MP has received a valid configuration from the MX switch.
Installing and Connecting an MP-622 Installing an MP-622 Aligning Antennas for Bridge or Mesh Links If you are installing MP-622 units for wireless bridge or Mesh Services operation, after the units have been mounted, connected, and the radios are operating, the antennas must be accurately aligned to ensure optimum performance on the bridge or mesh links. This alignment process is particularly important for long-range point-to-point links.
Installing and Connecting an MP-622 Installing an MP-622 When aligning the antennas the MP with the antenna that is being aligned to must be set to send link-calibration packets. Use the following command to setup the MP that the MP-622 is being aligned with. set ap num radio num link-calibration mode {enable | disable} Link-calibration should be disabled under normal operation of the MP.
Installing and Connecting an MP-622 Installing an MP-622 3 – 16 MP-622 Installation Guide
4 4 MP-622 Technical Specifications This chapter lists the technical specifications for the Trapeze Networks MP-622. For detailed compliance information, see the Regulatory Information document. The Trapeze Regulatory Information document is located at: http://www.trapezenetworks.com/support/contact_support/ and can be downloaded in PDF format. Note: Table 4– 1 lists the mechanical and compliance specifications. Table 4– 2 lists the MAC address allocation scheme.
MP-622 Technical Specifications Federal Communication Commission Interference Statement Table 4– 1. MP-622 Mechanical and Compliance Specifications (continued) Specification Description Maximum Clients 64 for the radio interface set to access point mode Modulation Types 802.11a: BPSK, QPSK, 16-QAM, 64-QAM 802.11g: CCK, BPSK, QPSK, OFDM 802.11b: CCK, BPSK, QPSK Network Configuration Access Point Mode: Infrastructure Bridge Mode: Point-to-point and point-to-multipoint Operating Frequency 802.11a: 5.
MP-622 Technical Specifications Industry Canada Statement This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
MP-622 Technical Specifications MAC Addresses MAC Addresses Each MP-622 is assigned a unique block of 64 MAC addresses. Each radio has 32 MAC addresses and can therefore support up to 32 SSIDs, with one MAC address assigned to each SSID as its BSSID. The MAC address block is listed on a label on the back of the MP. If the MP is already deployed and running on the network, you can display the MAC address assignments by using the show {ap | dap} status command.
MP-622 Technical Specifications Antenna Specifications Table 4– 3. 8 dBi Omnidirectional (2.4 GHz) Antenna Specifications (continued) Specification Description Impedance 50 Ohms Connector N type, male Radome Material: Fiber glass Color: Gray-white Environmental Survival Wind Speed: 134.22 mph (216 km/hr) Temperature: -40 °F to 176 °F (-40 °C to 80 °C) Humidity: 95% @ 131 °F (55 °C) Mechanical Dimensions: 22.8 x 0.82 in (diameter) (58 x 2.1 cm) Weight: 0.
MP-622 Technical Specifications Antenna Specifications 13.5 dBi 120-Degree Sector Table 4– 5. 13.5 dBi 120-Degree Sector Antenna Specifications 4–6 Specification Description Model Number ANT-5120-OUT Frequency Range 5.150 - 5.875 GHz Gain 13.5 dBi VSWR 2.
MP-622 Technical Specifications Antenna Specifications 10 dBi 120-Degree Sector Table 4– 6. 10 dBi 120-Degree Sector Antenna Specifications Specification Description Model Number ANT-1120-OUT Frequency Range 2.4 - 2.5 GHz Gain 10 dBi VSWR 1.5 : 1 max Polarization Linear, vertical HPBW Horizontal: 120° Vertical: 15° Downtilt 0° Power Handling 10 W (cw) Impedance 50 Ohms Connector N type, female Radome Material: ABS Color: Gray, white Environmental Survival Wind Speed: 134.
MP-622 Technical Specifications Antenna Specifications 18 dBi 18-Degree Panel Table 4– 7. 18 dBi 18-Degree Panel Antenna Specifications Specification Description Model Number ANT-5PNL-OUT Frequency Range 4.9 - 5.875 GHz Gain 18 dBi VSWR 2.0 : 1 max Polarization Linear, vertical HPBW Horizontal: 18° Vertical: 18° Downtilt 0° Power Handling 5 W (cw) Impedance 50 Ohms Connector N type, female Radome Material: ABS Color: Gray, white Environmental Survival Wind Speed: 134.
MP-622 Technical Specifications Foreign Regulatory Requirements Safety Compliance Power Cord Safety Please read the following safety information carefully before installing the device: Installation and removal of the unit must be carried out by qualified personnel only Warning! The unit must be connected to an earthed (grounded) outlet to comply with international safety standards. Do not connect the unit to an A.C. outlet (power supply) without an earth (ground) connection.
MP-622 Technical Specifications Foreign Regulatory Requirements Power Cord Set The supply plug must comply with CEE7/7 (“SCHUKO”) Europe The mains cord must be or marked and be of type HO3VVF3GO.75)minimum). IEC-320 receptacle Veuillez lire à fond l'information de la sécurité suivante avant d'installer l’appareil: AVERTISSEMENT: L’installation et la dépose de ce groupe doivent être confiés à un personnel qualifié.
MP-622 Technical Specifications Foreign Regulatory Requirements Germany Bitte unbedingt vor dem Einbauen des Geräts die folgenden Sicherheitsanweisungen durchlesen (Germany): WARNUNG: Die Installation und der Ausbau des Geräts darf nur durch Fachpersonal erfolgen. Das Gerät sollte nicht an eine ungeerdete Wechselstromsteckdose angeschlossen werden. Das Gerät muß an eine geerdete Steckdose angeschlossen werden, welche die internationalen Sicherheitsnormen erfüllt.
MP-622 Technical Specifications Foreign Regulatory Requirements 2. Legen Sie den V-förmigen Teil der Halterung um den Mast und ziehen Sie die Befestigungsmuttern gerade so fest an, dass sie die Halterung am Mast festhalten. (Die Halterung muss während der Ausrichtung eventuell um den Mast herumgezogen werden.) V-förmige Halterung 3. Stecken Sie die Ränder der V-förmigen Halterung in die Aussparungen in der rechteckigen Platte und ziehen Sie die Muttern fest an.
MP-622 Technical Specifications Foreign Regulatory Requirements 4. Befestigen Sie die verstellbare, rechteckige Platte mit den beigefügten Schrauben an der Bridge. 5. Befestigen Sie die Bridge mit Halter an der am Mast angebrachten Platte. Befestigen Sie die drahtlose Bridge mit den beigefügten Muttern an der Halterung. Berücksichtigen Sie dabei die Ausrichtung der Antennenpolarisierung; alle Antennen in einem Link müssen mit derselben Polarisierung montiert werden.
MP-622 Technical Specifications Foreign Regulatory Requirements Verwenden der Halterung für Wandmontage Montieren Sie das Gerät anhand folgender Schritte mit der Halterung für Wandmontage an eine Wand: Note: Achtung: Die Halterung für Wandmontage ist nicht dafür vorgesehen, dass die integrierte Antenne der drahtlosen Bridge ausgerichtet werden kann. Sie ist für die Geräteverwendung mit einer externen Antenne gedacht. 1.
MP-622 Technical Specifications Foreign Regulatory Requirements 4. Befestigen Sie die drahtlose Bridge mit den beigefügten Muttern an der Halterung. 5. Verbinden Sie das Ethernet-Kabel (und das Netzkabel, falls erforderlich) mit den Anschlüssen auf der Vorderseite der Bridge. Anschließen der externen Antennen Die in der Bridge eingebaute Antenne ist ihre Hauptantenne. Für einige Anwendungen, z.B.
MP-622 Technical Specifications Foreign Regulatory Requirements 3. Versiegeln Sie die Antennenanschlüsse mit wasserdichtem Klebeband, um zu verhindern, dass Wasser in die Anschlüsse eindringt. 2.4 GHz Anschluss Typ N 5 GHz Anschluss Typ N Externe 5 GHz Antenne mit hoher Verstärkung Externe 2,4 GHz Antenne mit kugelförmiger Richtcharakteristik HF-Koaxialkabel Anschließen der Kabel an das Gerät 1. Verbinden Sie das Ethernet-Kabel mit dem Ethernet-Port der drahtlosen Bridge. 2.
MP-622 Technical Specifications Foreign Regulatory Requirements Erdungsleitung Ethernet-Kabel Anschließen des PoE Injectors So schließen Sie die drahtlose Bridge an eine Stromquelle an: Achtung: Installieren Sie den PoE Injector nicht im Freien. Das Gerät darf nur in Innenräumen installiert werden. Warning! Note: Hinweis: Der Ethernet-Port der drahtlosen Bridge unterstützt kein PoE (Power over Ethernet) auf Basis des IEEE 802.3af-Standards.
MP-622 Technical Specifications Foreign Regulatory Requirements 3. Stecken Sie den Netzleitungsstecker direkt in den standardmäßigen Netzanschluss des Injector-Moduls. 4. Verbinden Sie das andere Ende der Netzleitung mit einer geerdeten, 3-poligen Netzstromquelle. Note: Hinweis: Bei internationaler Verwendung müssen Sie eventuell die Netzleitung austauschen. Sie müssen eine Netzleitung verwenden, die für den Steckdosentyp in Ihrem Land geprüft und abgenommen ist. 5.
5 5 Cables and Pinouts This chapter describes the wiring and pin assignments for the cables and connectors that can be used with the MP-622. Twisted-Pair Cable Assignments For 10/100BASE-TX connections, a twisted-pair cable must have two pairs of wires. Each wire pair is identified by two different colors. For example, one wire might be green and the other, green with white stripes. Also, an RJ-45 connector must be attached to both ends of the cable.
The RJ-45 Input port on the power injector is wired with MDI pinouts. This means that you must use crossover cables for connections to PCs or servers, and straight-through cable for connections to switches or hubs. However, when connecting to devices that support automatic MDI/MDI-X pinout configuration, you can use either straight-through or crossover cable. Table 5– 1.
8-Pin DIN Connector Pinout The Ethernet cable from the power injector connects to an 8-pin DIN connector on the MP-622. This connector is described in the following figure and table. Figure 5–4. 8-Pin Ethernet DIN Connector 2 1 3 7 4 8 5 6 Table 5– 2.
Figure 5–5.
6 6 Wireless Bridge Link Planning The MP-622 supports fixed point-to-point or point-to-multipoint wireless links. A single link between two points can be used to connect a remote site to a larger core network. Multiple bridge links can provide a way to connect widespread Ethernet LANs. For each link in a wireless bridge network to be reliable and provide optimum performance, some careful site planning is required. This chapter provides guidance and information for planning your wireless bridge links.
Radio Path Planning Although the MP-622 uses IEEE 802.11a radio technology, which is capable of reducing the effect of multipath signals due to obstructions, the wireless bridge link requires a “radio line-of-sight” between the two antennas for optimum performance. The concept of radio line-of-sight involves the area along a radio link path through which the bulk of the radio signal power travels. This area is known as the first Fresnel Zone of the radio link.
Antenna Height A reliable wireless link is usually best achieved by mounting the antennas at each end high enough for a clear radio line of sight between them. The minimum height required depends on the distance of the link, obstacles that may be in the path, topology of the terrain, and the curvature of the earth (for links over 3 miles). For long-distance links, a mast or pole may need to be constructed to attain the minimum required height.
(66 ft), so a 2.3 m (7.5 ft) mast or pole must be constructed on its roof to achieve the required antenna height. Building B is only three stories high, or 9 m (30 ft), but is located at an elevation that is 12 m (39 ft) higher than building A. To mount an antenna at the required height on building B, a mast or pole of only 1.3 m (4.3 ft) is needed. Never construct a radio mast, pole, or tower near overhead power lines.
Radio Interference The avoidance of radio interference is an important part of wireless link planning. Interference is caused by other radio transmissions using the same or an adjacent channel frequency. You should first scan your proposed site using a spectrum analyzer to determine if there are any strong radio signals using the 802.11a channel frequencies. Always use a channel frequency that is furthest away from another signal.
6-6 MP-622 Installation Guide
