BreezeNET DS.11 Series BU-DS.11 RB-DS.
Front Matter © 2000 by BreezeCOM Ltd. All rights reserved. No part of this publication may be reproduced in any material form without the written permission of the copyright owner. No part of this publication may be reproduced in any material form without the written permission of the copyright owner. Trade Names BreezeNET and BreezeLINK are trade names of BreezeCOM Ltd. Other brand and product names are registered trademarks or trademarks of their respective companies.
Front Matter FCC Radio Frequency Interference Statement This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.
Front Matter •7 Site information such as possible radio path problems (like trees, machines, and buildings). •8 Distance between devices. •9 Configuration, statistic counters, and error messages as seen on the monitor. •10 Description of problems encountered. To contact BreezeCOM Technical Support, refer to the Technical Support page of the BreezeCOM web site: www.breezecom.com User’s Guide iv BreezeNET BU-DS.11/RB-DS.
Table of Contents TABLE OF CONTENTS 1. INTRODUCTION............................................................................................................................... 1-1 1.1 General ..............................................................................................................................................1-1 1.2 System Description..........................................................................................................................1-1 1.2.1 BreezeNET DS.
Table of Contents 2.7.3 Verifying Correct Operation of the Outdoor Unit .................................................................. 2-17 2.8 Installing the Indoor Unit.............................................................................................................. 2-19 2.8.1 Verifying Correct Operation of the Indoor Unit ..................................................................... 2-20 2.8.2 Reloading Factory Default Settings.....................................................
Table of Contents APPENDIX A. RADIO SIGNAL PROPAGATION .................................................................................1 A.1 Radio Signal Propagation................................................................................................................... 1 A.1.1 Introduction...................................................................................................................................... 1 A.1.2 RF Terms and Definitions .........................................
Table of Contents TABLE OF FIGURES Figure 1-1. DS.11 Outdoor Application ..............................................................................................1-2 Figure 2-1. General Installation Scheme - Pole Mounting ................................................................2-4 Figure 2-2. Holes/Grooves/Screw Holes ......................................................................................... 2-14 Figure 2-3. Pole Mounting Installation Using the Supplied Brackets.................
Introduction 1. INTRODUCTION 1.1 General This chapter describes the scope of this manual and the main features of the BreezeNET BU-DS.11 (Wireless Base Station) and RB-DS.11 (Wireless Bridge Client). Also in this chapter: relevant standards, compatibility issues, product functionality and use of the DS (Direct Sequence) WLAN. 1.2 System Description The BreezeNET DS.11 Wireless Base Station and Wireless Bridge Client are designed to provide long range point-to-multipoint links for outdoor applications.
Introduction 1.3 BreezeNET DS.11 Functional Description The BreezeNET BU-DS.11 and RB-DS.11 can be used as a high speed connection between two remote networks. Server Server Figure 1-1. DS.11 Outdoor Application BU-DS.11 Wireless Base Station The BU-DS.11 is an IEEE 802.11 TGb-compliant base station bridge that is used to connect either a single remote site or multiple remote sites to a central server or Internet connection.
Introduction The RB-DS.11 comes in two options: the basic unit comes with an antenna integrated on the front cover of the Outdoor unit. The RB-DS.11D has no integral antenna, and provides two antenna connectors (on the Outdoor unit) for connection of one or two external antennas. Refer to Section Sections 2.6.4 and 2.6.12 for information on how to select external antennas. When two antennas are connected to the Outdoor unit, the unit supports the antenna diversity feature described in Section 2.6.6.
Introduction 1.4 How to Use This Guide This User's Manual provides instructions for planning and setting up your Wireless LAN. This includes details on how to install each unit, including antennas and accessories. This manual contains the following chapters: ⇒1 Chapter 1: Introduction - Explains how to use this manual and presents the BreezeNET DS.11 series. ⇒2 Chapter 2: Installation - Describes how to install the units. ⇒3 Chapter 3: Using the DS.11 Management Utility - Describes how to use the DS.
Installation 2. INSTALLATION 2.1 Quick Start to Wireless Networking Perform the following steps to configure a WLAN for the first time: 1. Physically connect the BU-DS.11/RB-DS.11 units to the Ethernet LAN. Make sure they are switched on. The DS.11 wireless network will be up and running immediately. If you are content with the default settings of the BU-DS.11/RB-DS.11 units, you can stop right here. It is more likely however, that you want to assign different radio frequencies to each BU-DS.11/RBDS.
Installation 2.2 Packing List When you first open the package, verify that the unit is complete with the following components: •1 Indoor unit •2 Outdoor unit (includes integrated antenna or antenna connectors for optional connection to external antennas) •3 Pole mounting kit for the Outdoor unit (2 U-bolts that fit up to 2” poles) •4 110/220 VAC Power Cord (may be open-ended, depending on destination country) 2.
Installation 2. Mount the Outdoor unit and the external antennas (optional). Connect the Outdoor unit to the antenna if installing external antennas. Note: The FCC 15.203 requirement prohibits the connection of external antennas with standard Ntype connectors. In order to meet this requirement, the external antenna connectors provided on DS.11D models (with no integral antenna) are non-standard, featuring left-handed (counterclockwise) rotation. 3.
Installation Antenna Antenna (BU-DS11D (BU-DS.11D and RB-DS.11Dand units only) RD-DS11D units only) OUTDOOR ANT 1 Outdoor Unit Ground Cable to Grounding Point Indoor to Outdoor Unit Cable INDOOR Indoor Unit To LAN To Mains Figure 2-1. General Installation Scheme - Pole Mounting User's Guide 2-4 BreezeNET BU-DS.11/RB-DS.
Installation 2.5 Guidelines for Placement of BU-DS.11 Units Each Wireless Base Station in the network forms the center of a cell, or BSS. The placement of BU-DS.11 units should be such that cells overlap slightly, to guarantee seamless wireless connectivity everywhere. Neighboring BU-DS.11 units should preferably send and receive on different channels for maximum throughput. Creating a cell plan for your site can be complicated, and is usually done by experts equipped with special measuring equipment.
Installation 2.6 Outdoor Installation Considerations This chapter describes various considerations to take into account when planning an outdoor installation including site selection, antenna alignment, antenna polarization, antenna seal, and cell size. 2.6.1 Co-locating DS.11 Outdoor Units Up to 3 BU-DS.11 or RB-DS.11 units can be co-located on the same building top or tower. Each unit is assigned to one of the non-overlapping channels, 1, 6, or 11.
Installation Minimal Path Loss Path loss is determined mainly by several factors: •4 Distance between sites – Path loss is lower and system performance better when distances between sites are shorter. •5 Clearance – Path loss is minimized when there exists a clear line of sight. The number, location, size, and makeup of obstacles determine their contribution to path loss. •6 Antenna height – Path loss is lower when antennas are positioned higher.
Installation 2.6.3 Rooftop Installation WARNING! Rooftop antenna installations are extremely dangerous! Incorrect installation may result in death, serious injury and/or damage. Such installations should be performed by professional antenna installers only! Rooftop installations offer several advantages: •1 Increased antenna range. •2 Fewer obstacles in path. •3 Improved performance due to greater height. •4 Reduced multipath problems. 2.6.4 Antennas for Outdoor Applications The BreezeNET DS.
Installation 2. Mount the antennas as high as possible. 3. Connect the coaxial cable to the BU-DS.11 at the main site. 4. Connect the coaxial cable to the RB-DS.11 at the remote site. 5. Power on both units. 6. Synchronize the units by aligning the antennas at the main and remote sites until maximum signal quality is obtained. Check the signal quality RSSI bar on the bottom panel of the RBDS.11 bottom panel.
Installation 2.6.10 Link Distance For open outdoor areas with an unobstructed line of sight between the BU-DS.11 and the wireless bridge, the suggested maximum distance is: BU-DS.11 with external antennas up to 24Km (15 miles) in the USA Note: Up to 15Km in Europe The maximum distance of 24Km/15 miles is achieved using 24 dBi antennas. The maximum distance of 15Km is achieved using 18 dBi antennas. 2.6.11 Using Outdoor Range Tables Outdoor installations must have a clear line-of-sight.
Installation Model Ant. Gain Cable Length Kit Contains: Ideal for: Dispersio n Dimensions HxWxD UNI-8.5Ext 8.5 dBi 8-ft UNI-8.5 Antenna Mounting Hardware 8-ft Cable Assembly Short range outdoor multipoint links 75°H/ 60° V 4"x3.7"x1.2" UNI-11P-75 11 dBi 30-ft UNI-11P-75 Antenna Mounting Hardware 30-ft Cable Assembly ISPs, school districts, and campus area networks requiring wide dispersion patterns 75°H/ 28° V 11"x7.5"x3.
Installation Table 2-3. ETSI Available Antennas (Europe and Rest-of-World) Note: Model Ant. Gain Cable Length Kit Contains: Ideal for: Dispersion Dimensions HxWxD OMNI-2 2 dBi N/A 2 OMNI-2 Antennas Proprietary SMA Converting “D” Models for use indoors 360°H/ 60° V 3"x.5" Tubular OMNI-6 6 dBi 3m OMNI-6 Antenna 90° Mount Bracket 3m RG58 Cable Extending indoor range of Access Points and station adapters 360°H/ 26° V 13"x0.75" Tubular UNI-8.5 8.5 dBi 6m UNI-8.
Installation 2.6.13 Precautions Note: Detached antennas, whether installed indoors or out, should be installed ONLY by experienced antenna installation professionals who are familiar with local building and safety codes and, wherever applicable, are licensed by the appropriate government regulatory authorities. Failure to do so may void the BreezeNET Product Warranty and may expose the end user to legal and financial liabilities.
Installation •4 Metal bands (9/16” wide, minimum 12” long) Figure 2-2 shows the locations of the holes, grooves and screw holes on the rear side of the unit. Figure 2-3 illustrates the method of installing an unit on a pole using the supplied brackets. Note: Make sure to install the unit with the bottom panel (the panel with the signal strength bar and LEDs) facing downward. Figure 2-2. Holes/Grooves/Screw Holes Figure 2-3.
Installation 2.7.1 Connecting the Ground and Antenna Cables The Ground terminal (marked is located on the bottom panel of the Outdoor unit, shown in Figure 2-4. The Antenna RF connectors (marked 1 and 2 respectively) are located on the top panel of the Outdoor unit. 1. Connect one end of the grounding cable to the Ground terminal and connect the other end to a good ground connection. 2. Connect an RF cable between each ANT connector and the antenna.
Installation 2.7.2 Connecting the Indoor-to-Outdoor Cable 1. Remove the two screws holding the waterproof seal assembly to the Outdoor unit and remove the waterproof seal. 2. Unscrew the top nut from the waterproof seal. 3. Route an uncrimped straight Ethernet cable (8-wire, 24 AWG pin-to-pin) through the top nut and the waterproof seal. Refer to Appendix B for instructions on preparing the RJ-45 cable connector. Note: The 8-wire cable should be shielded. 1. Insert and crimp the RJ45 connector. 2.
Installation 2.7.3 Verifying Correct Operation of the Outdoor Unit To verify proper operation, view the LED indicators located on the bottom panel of the outdoor unit as shown in Figure 2-4. Table 2-4 lists the various LED states.
Installation User's Guide Name Description Functionality RSSI Bar on BU-DS.11 units Series of LEDs Indicates the number of RB-DS.11 units associated with the BU-DS.11; for each LED that lights up, one RB-DS.11 is associated. Bar0 (red) 1 Bar1 (green) 2 Bar2 (green) 3 Bar3 (green) 4 Bar4 (green) 5 Bar5 (green) 6-7 Bar6 (green) 8-15 Bar7 (green) 16-31 Bar8 (green) 32-63 Bar9 (yellow) 64-128 2-18 BreezeNET BU-DS.11/RB-DS.
Installation 2.8 Installing the Indoor Unit According to the specific conditions of the installation, route the Indoor-to-Outdoor cable into the building so that it conveniently reaches the Indoor unit to ensure minimal interference, leaving some spare. The cable is supplied open ended at the side of the Indoor unit, to allow for conveniently threading it into the building through a hole that is as small as possible. Assemble the connector and cover plug supplied with the cable.
Installation Note: If the power cord supplied with the unit is open ended, connect to it a power plug appropriate to the country in which the unit is being installed. The color codes of the cable are: brown phase ~ blue neutral 0 yellow/green grounding The operating AC mains voltage of the Indoor unit is marked on the rear panel of the unit. 3.
Installation Name Description Functionality POWER Power indication Lights Green when the Indoor unit supplies 48VDC to the Outdoor unit; OFF when no power is supplied. LINK Self Test and Remote Ethernet Link indication OFF - Self test failed and no Ethernet link. Green – Self test passed and remote Ethernet link is OK. Blinking Green – Self test passed (instantaneously blinks when the baseband cable is connected, regadless of the Ethernet link status). BreezeNET BU-DS.11/RB-DS.
Installation 2.8.2 Reloading Factory Default Settings The Reset button, located on the Indoor unit front panel, is used to restore the factory default parameter settings of the Outdoor unit (in the event that the default settings were changed via an SNMP management station). To reset the unit: 1. Disconnect the power cable from the Indoor unit. 2. Insert a paper clip and press the Reset button while inserting the power cable back into its socket at the same time. 2.8.
The DS.11 Management Utility 3. THE DS.11 MANAGEMENT UTILITY The DS.11 Management utility is an SNMP-based (Simple Network Management Protocol) utility that provides a consistent view of the wireless network. The system administrator can use the DS.11 Management utility to control a large number of DS.11 units from a single location. The management utility can be used to manage the following DS.11 units: BU-DS.11 and RB-DS.
The DS.11 Management Utility 3.1 DS.11 Management Utility Main Window The DS.11 Management utility main window consists of two main areas, as can be seen in Figure 31: •1 The IP Address and Community Selection area - In this area, you select the community string and address of the unit you wish to manage or edit.
The DS.11 Management Utility 3.1.1 Assigning and Editing IP Addresses Manually 1. Click the button. The Set IP dialog box is displayed. Figure 3-2. The Set IP Dialog Box 2. Type the parameters in the appropriate fields and click OK; the MAC address is written underneath the unit. A message box is displayed notifying you when the changes are to take affect. This feature can be used only if the Manager is on the same Ethernet segment as the unit and not behind the router.
The DS.11 Management Utility 3.1.3 IP/SNMP Tab Software upgrades can be downloaded to DS.11 units using the TFTP protocol. The IP/SNMP tab allows you to define or edit the IP parameters for the DS.11 units, used for the download procedure. Figure 3-4. IP/SNMP Tab User's Guide 3-4 BreezeNET BU-DS.11/RB-DS.
The DS.11 Management Utility 3.1.3.1 Assigning and Editing IP Parameters Using Network Autodiscovery Type the known Read/Write Community string in the Community field (the default string is Public for read and Private for read/write). Select a unit address as describe in Section 0. The unit's Read-Read/Write Community strings appear in the SNMP Communities area of the window, and the unit's parameters appear in the IP Parameters area of the window: •1 Read - The read only community string of the unit.
The DS.11 Management Utility Figure 3-5. General Info Tab •1 Firmware - The current firmware version. •2 Hardware - The current hardware version. •3 System Name - The name of the selected unit. •4 Location - Location of the selected unit. •5 MAC Address - MAC address of the selected unit. •6 BSS Address - In the RB-DS.11, this defines the BSS address (the BU-DS.11 that the unit is associated with). In the BU-DS.11, it defines the MAC address of the unit.
The DS.11 Management Utility Table 3-1. Frequency Selection List Channel Selection Frequency 1 2412 MHz 2 2417 MHz 3 2422 MHz 4 2427 MHz 5 2432 MHz 6 2437 MHz 7 2442 MHz 8 2447 MHz 9 2452 MHz 10 2457 MHz 11 2462 MHz •1 CW Win - select the contention window size to 15 or 31. The contention window backoff algorithm is a well know method used to resolve contention between different stations wanting to access the medium.
The DS.11 Management Utility Figure 3-7. RSSI Tab Select an IP address as explained previously in Section 0. In the Associated Stations table, you can see all the stations associated with the selected unit and their signal quality. 3.1.7 Counters Tab Figure 3-8. Counters Tab Select a counter and drag it to the icon to view the graph. •1 Transmit Fragment - The number of transmitted frames.
The DS.11 Management Utility •2 Tx Frame Count - The number of frames transmitted to the wireless media. The count includes the first transmission of data frames (without retransmissions), and the number of control and management frames. •3 Multicast Tx Frames- The number of transmitted multicast frames. •4 Rx Fragments - The number of frames received, including data, control, and duplicate data frames. •5 Multicast Rx - The number of received multicast frames.
The DS.11 Management Utility WARNING! This will erase all settings. Configuration - Click Import/Export to import or export a complete set of configuration parameters to an external file. 3.1.9 Log Tab Figure 3-10. Log Tab When an event occurs, a trap is sent to the defined host address. The Log tab allows you to configure the host address to which the traps are sent. A list of the last traps is displayed in the event log area, below the Local IP field. User's Guide 3-10 BreezeNET BU-DS.11/RB-DS.
The DS.11 Management Utility The default host address is the IP address of the PC running the DS.11 Management utility. 1. Select the IP address as explained in Section 0. The selected address appears in the Local IP field. 2. Click the button to register this address as the host address. 3. Repeat Step 2 for all the IP addresses you wish to send traps to. 3.1.10 Security Tab Figure 3-11. Security Tab The BU-DS.11 can use one of the following authentication algorithms (as defined in the 802.
The DS.11 Management Utility •1 Default Key ID – Sets the default key for encryption in the Authentication process. This is the encryption key that will be used for transmissions between the station and the BU-DS.11. •2 WEP Key – Define the encryption keys used for transmissions between the station and the BU-DS.11. Specify each key by clicking the appropriate WEP Key row (First, Second, Third or Fourth) and entering 10 Hex digits (5 pairs of characters) for each of the 4 keys. 3.1.
System Troubleshooting 4. SYSTEM TROUBLESHOOTING The following troubleshooting guide provides answers to some of the more common problems which may occur when installing and using the BreezeNET DS.11. If problems not mentioned in this guide should arise, checking the Ethernet and WLAN counters may help (see Section 3.1.7). If the problem persists, please feel free to contact your local distributor or the BreezeCOM Technical Support Department. 4.1 Troubleshooting Guide Table 4-1.
System Troubleshooting Problem and Indication Possible Cause Corrective Action Failure to establish wireless link (“D” models/external antennas) 1. Power supply to units may be faulty. 1. Verify power to units. 2. Cables may be improperly connected 3. There may be some problem with antenna installation. 2. Verify that all cables are connected securely. 3. Refer to previous Section and verify wireless link between the units. 4.
Software DownLoad Procedure 5. SOFTWARE DOWNLOAD PROCEDURE 1. Set the unit's IP address, using the DS.11 Management utility, and verify that the PC's IP address belongs to the same Subnet Mask as the unit. 2. Ping the unit's IP address. Make sure that the Ping replies are being received. 3. Use the TFTP utility on the PC: i) Syntax: TFTP [-i] destination host [PUT] source file [password] ii) Example: TFTP -i 199.203.141.30 put ap1100.
Installing Accessories 6. INSTALLING ACCESSORIES This chapter introduces some of the accessories available for specific installations, and describes how to install them. 6.1 RFS 122 Radio Frequency Splitter The RFS 122 Radio Frequency Splitter is used to split the RF signal generated by a transmitter into two signals. These signals are then sent to two different and independent antennas. The RFS 122 enables radio transmission using two directional antennas connected to the same port of the BreezeNET DS.
Technical Specifications 7. TECHNICAL SPECIFICATIONS 7.1 Supported Standards • Compliant with ETS 300 328 and ETS 300 826 (CE marked) • IEEE 802.11 TGb standard for Wireless LAN at 11 and 5.5 Mbps • IEEE 802.11 standard for 1 and 2 Mbps • Most of the major networking protocols (including IP, IPX) 7.2 Power Specifications Power Supply Input (via Indoor unit) 207VAC - 253VAC 250mA OR 100VAC - 120VAC 500mA AC Mains option is factory wired.
Technical Specifications Dependable upon Antenna type , system app. & country regulation. Frequency range 2.4-2.4835 Ghz Number of channels 13 (3 non-overlapping) 11 (3 non-overlapping) 4 (1 non-overlapping) 7.5 Sensitivity @ 1Mbps -92dBM, IE-5 BER @ 2Mbps -88dBM, IE-5 BER @ 5.5Mbps -87dBM, IE-5 BER @ 11Mbps -85dBM, IE-5 BER 7.6 Configuration and Management Configuration and setup SNMP and Windows-based Manager utility Site survey Yes LED indicators Yes SNMP management Yes 7.
Technical Specifications 7.9 Environmental Indoor Unit Outdoor Unit Operating temperature (ambient) 0°C to 40°C (32°F to 104°F) -40°C to 50°C (-40°F to 122°F) Storage temperature -5°C to 70°C (23°F to 158°F) -5°C to 70°C (23°F to 158°F) Operating humidity 10% to 90% (non-condensing) 10% to 90% (non-condensing) Storage humidity 10% to 90% (non-condensing) 10% to 90% (non-condensing) BreezeNET BU-DS.11/RB-DS.
Appendix A. Radio Signal Propagation APPENDIX A. RADIO SIGNAL PROPAGATION A.1 Radio Signal Propagation A.1.1 Introduction This section explains and simplifies many of the terms relating to antennas and RF (Radio Frequency) used when dealing with an RF installation system. The following diagram depicts a typical radio system: Figure A-1. A Typical Radio System A radio system transmits information to the transmitter.
Appendix A. Radio Signal Propagation P dBm = 10 x Log P mw For example: 1 Watt = 1000 mW; P dBm = 10 x Log 1000 = 30 dBm 100 mW; P dBm = 10 x Log 100 = 20 dBm For link budget calculations, the dBm convention is more convenient than the Watts convention. Attenuation Attenuation (fading) of an RF signal is defined as follows: Figure A-2.
Appendix A. Radio Signal Propagation At 2.4 Ghz, this formula is: 100+20xLog(RKm) BreezeNET BU-DS.11/RB-DS.
Appendix A. Radio Signal Propagation Antenna Characteristics Isotropic Antenna A hypothetical antenna having equal radiation intensity in all directions. Used as a zero dB gain reference in directivity calculation (gain). Antenna Gain A measure of directivity. It is defined as the ratio of the radiation intensity in a given direction to the radiation intensity that would be obtained if the power accepted by the antenna was radiated equally in all directions (isotropically).
Appendix A. Radio Signal Propagation Figure A-5. Radiation Pattern of Directional Antenna Antenna Beamwidth The directiveness of a directional antenna. Defined as the angle between two half-power (-3 dB) points on either side of the main lobe of radiation. BreezeNET BU-DS.11/RB-DS.
Appendix A. Radio Signal Propagation System Characteristics Receiver Sensitivity The minimum RF signal power level required at the input of a receiver for certain performance (e.g. BER). EIRP (Effective Isotropic Radiated Power) The antenna transmitted power. Equal to the transmitted output power minus cable loss plus the transmitting antenna gain.
Appendix A. Radio Signal Propagation In conclusion, the received signal power is above the sensitivity threshold, so the link should work. The problem is that there is only a 2 dB difference between received signal power and sensitivity. Normally, a higher margin is desirable due to fluctuation in received power as a result of signal fading.
Appendix A. Radio Signal Propagation Clear Line of Sight A clear line of sight exists when no physical objects obstruct viewing one antenna from the location of the other antenna. A radio wave clear line of sight exists if a defined area around the optical line of sight (Fresnel Zone) is clear of obstacles. Fresnel Zone The Fresnel zone is the area of a circle around the line of sight. The Fresnel Zone is defined as follows: Figure A-7.
Appendix A. Radio Signal Propagation When at least 80% of the first Fresnel Zone is clear of obstacles, propagation loss is equivalent to that of free space. BreezeNET BU-DS.11/RB-DS.
Appendix B. Preparing the Indoor-to-Outdoor Cable APPENDIX B. PREPARING THE INDOOR TO OUTDOOR CABLE The Indoor-to-Outdoor cable provides pin-to-pin connection on both sides. It is supplied openended at the one side, to allow the installer to conveniently route the cable into the waterproof seal off the Outdoor unit. Figure 7-1 shows the wire pair connections required for the Indoor-to-Outdoor cable. 1 2 1+2 3 4 5 6 7 8 4+5 7+8 3+6 Figure 7-1.
Appendix C. DS.11 FAQ APPENDIX C. DS.11 FAQ How many BU-DS.11 or RB-DS.11 units can be co-located on the same building top or tower? You can co-locate up to 3 BU-DS.11 or RB-DS.11 units on the same structure. Each unit is assigned to one of the non-overlapping channels, 1, 6, or 11. What is the antenna separation requirement for co-locating BU-DS.11 or RB-DS.
Appendix C. DS.11 FAQ Why are there 11 channels and only 3 usable? The IEEE802.11 specification calls out 11 selectable channels (USA) between 2414MHz and 2462MHz. Because of the transmission bandwidth of the DS modulation, only 3 channels are nonoverlapping. Those are channels 1, 6, and 11, therefore, only 3 systems may be co-located.
Appendix C. DS.11 FAQ Can I downgrade my DS.11 firmware? Yes, an earlier version of firmware can overwrite a newer version. Can I keep the previous version of firmware? No and yes. The previous version of firmware can not be kept on the DS.11 itself, but can be stored on your PC and loaded if needed. Does DS.11 support 802.1Q VLAN? Yes, but the support is limited to transparent operation. Meaning, DS.11 does not take any action on 802.1Q frames, but will transparently pass them within a VLAN network.
Appendix C. DS.11 FAQ What is the maximum number of networked PC’s the BU-DS.11/RB-DS.11 can learn? 1024 network MAC addresses can be learned by the BU-DS.11/RB-DS.11. Can the BU-DS.11/RB-DS.11 be used for multi-point as well as point to point links? Yes. The BU-DS.11 can support multiple RB-DS.11 units creating a multi-point network. How many RB-DS.11 units can one BU-DS.11 support? The maximum number of associations is 128. What is the practical limit to the number of client bridges per BU-DS.
Appendix C. DS.11 FAQ The DS.11 comes with a Windows based manager utility. With this utility you can configure link parameters and monitor signal quality and RSSI (received signal strength indication). Optimizing antenna alignment is done using the signal quality and RSSI display. Any computer on the network can use this utility to manage the BU-DS.11/RB-DS.11. Is the DS.11 compatible with other DS equipment from other vendors? Yes.
