Alvarion BreezeNET PRO.11 Guía de usuario Pagina 189
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Appendix
BreezeNET PRO.11
9-33 User’s
Guide
Exponential Back-off means that each time the station chooses a slot and happens
to collide, it will increase the maximum number for the random selection
exponentially.
The 802.11 standard defines an Exponential Back-off Algorithm, that must be
executed in the following cases:
• When the station senses the medium before the first transmission of a packet,
and the medium is busy
• After each retransmission, and
• After a successful transmission
The only case when this mechanism is not used is when the station decides to
transmit a new packet and the medium has been free for more than DIFS.
The following figure shows a schematic of the access mechanism:
Figure 9-17. Access Mechanism
9.5.4 How Does a Station Join an Existing Cell
When a station wants to access an existing BSS (either after power-up, sleep mode,
or just entering the BSS area), the station needs to get synchronization information
from the Access Point (or from the other stations when in ad-hoc mode, which will
be discussed later).
The station can get this information by one of two means:
- User’s Guide 1
- Front Matter 2
- TABLE OF CONTENTS 5
- Table of Contents 6
- TABLE OF FIGURES 10
- Table of Figures 11
- 1. INTRODUCTION 13
- Introduction 14
- BreezeNET PRO series 15
- 1.4.2 Startup Procedure 25
- 1.4.3 AP-10 Access Point 25
- 1.4.4 SA-10 Station Adapter 26
- 1.4.5 SA-40 Station Adapter 26
- 1.4.6 WB-10 Wireless Bridge 26
- 1.4.7 SA-PCR Station Adapter 27
- 2. BASIC INSTALLATION 29
- 2.3 Position the Unit 30
- Basic Installation 32
- 10), and for Access Points 33
- 2.6.2 Access Point LEDs 34
- SETUP AND MANAGEMENT 35
- 3.2 Configuration Screens 36
- 3.3 Main Menu 39
- 3.4 System Configuration Menu 39
- 3.4.1 Station Status 40
- 3.4.2 IP and SNMP Parameters 41
- Table 3-1. Hopping Sequences 42
- 3.4.4 Bridging 45
- 3.4.5 Station Control 46
- 3.5 Advanced Settings Menu 48
- 3.5.2 Performance 49
- 3.5.3 Radio 50
- 3.5.4 Rate 50
- 3.5.5 AP Redundancy Support 50
- 3.6 Site Survey Menu 51
- 3.6.1 System Counters 52
- MAC address 56
- Official Version: 4.4.1 57
- Date: 26 May 1999 15:10:33 57
- 3.6.1.5 Reset All Counters 58
- 3.6.2 Survey Software 59
- RSSI to dBm 61
- 3.6.4 Event Log 62
- 3.7 Access Control Menu 63
- SETUP, AND MANAGEMENT 65
- For Windows 95A 70
- For Windows 95B 71
- 4.3.3 Initial Configuration 75
- 4.5.1 Station Status Tab 78
- 4.5.2 WLAN Parameters Tab 79
- 4.5.3 Station Control Tab 80
- 4.5.5 Power Management Tab 83
- 4.5.6 Security Tab 84
- 4.5.7 Maintenance Tab 87
- 4.5.8 Radio Tab 88
- 4.5.9 Performance Tab 89
- Figure 4-19. Survey Log 93
- To run a Site Survey: 95
- BreezeCOM 98
- BreezeNET PRO.11 Series 100
- Configuration Notes 103
- 5.1 System Configurations 105
- 5.1.1.1 Point-to-Point 106
- 5.1.1.2 Point-to-Multipoint 107
- ° radiation pattern 107
- 5.1.1.3 Mobile Applications 107
- Access Point to an Ethernet 109
- Access Points to an Ethernet 111
- 5.1.3 Multicell Configuration 112
- 5.2.1 Site Selection Factors 115
- $QWHQQDV 116
- +HDW6RXUFHV 116
- &HQWUDO/RFDWLRQ 116
- 5.2.2.1 Antenna Diversity 117
- 5.2.3 Construction Materials 118
- 5.2.4 Cell Size 119
- 5.3.1 Site Selection Factors 120
- 5.3.2 Rooftop Installation 121
- 5.3.3.1 Point-to-Point 122
- 5.3.3.2 Point-to-Multipoint 122
- 5.3.3.3 Antenna Alignment 122
- 5.3.3.4 Antenna Diversity 123
- 5.3.3.5 Antenna Polarization 123
- 5.3.4 Antenna Seal 124
- 5.3.5 Cell Size 124
- 5.3.6 Link Distance 124
- D Models, DL Models 127
- – DE Models 128
- Data Rate = 3Mbps, Sen=-71dBm 129
- Data Rate = 1Mbps, Sen=-81dBm 129
- Data Rate = 2Mbps, Sen=-75dBm 130
- Data Rate = 3Mbps, Sen=-67dBm 130
- Meter Heliax cable 131
- BreezeNET PRO.11 units 135
- 5.5 Precautions 137
- 5.5.3 Lightning Protection 138
- 5.5.4 Rain Proofing 138
- 6. ACCESSORY INSTALLATION 139
- 6.1.1 Installing the TPA 24 140
- 6.2.1 Installing the LNA 10 141
- Accessory Installation 142
- 6.4 AL 1 Lightning Arrestor 143
- WARNING! 146
- 7. UPGRADE PROCEDURE 149
- 8. SYSTEM TROUBLESHOOTING 151
- System Troubleshooting 152
- BreezeNET PRO.11 153
- 8.2 Checking Counters 155
- 9. APPENDIX 157
- 9.1.2 Supported Traps 158
- 9.2 Technical Specifications 159
- Appendix 160
- 9-5 User’s 161
- 9-7 User’s 163
- Amplifier 165
- Wired LAN Topology 166
- Wireless LAN Topology 167
- 9-13 User’s 169
- /RDG6KDULQJ 170
- '\QDPLF5DWH6ZLWFKLQJ 171
- 0HGLD$FFHVV 171
- )UDJPHQWDWLRQ 172
- &ROOLVLRQ$YRLGDQFH 172
- &KDQQHOL]DWLRQ 172
- 9.4 Radio Signal Propagation 173
- 5)3RZHU/HYHO 174
- $WWHQXDWLRQ 174
- Isotropic Antenna 175
- Antenna Gain 175
- Radiation Pattern 176
- Side Lobes 176
- Omni-directional Antenna 176
- Directional Antenna 176
- Antenna Beamwidth 177
- Receiver Sensitivity 177
- 6LJQDO)DGLQJ 179
- Clear Line of Sight 180
- Fresnel Zone 180
- 9.5.1 Architecture Components 181
- 9.5.3 The MAC Layer 183
- 9-29 User’s 185
- 9-31 User’s 187
- 9.5.3.5 Inter-Frame Spaces 188
- 9-33 User’s 189
- 9.5.5 Roaming 190
- 9.5.6 Keeping Synchronization 191
- 9.5.7 Security 191
- 9.5.7.2 Eavesdropping 192
- 9.5.7.3 Power Saving 192
- 9.5.8 Frame Types 193
- 9.5.9 Frame Formats 194
- Protocol Version 195
- Type and Subtype 196
- 9-41 User’s 197
- 'XUDWLRQ,' 198
- $GGUHVV)LHOGV 198
- 6HTXHQFH&RQWURO 199
- &5& 199
- 9.5.10.1 RTS Frame Format 199
- 9.5.10.2 CTS Frame Format 200
- 9.5.10.3 ACK Frame Format 200
- 9.5.12 Ad-Hoc Networks 201
- 3 User’s 205
- 5 User’s 207
- 7 User’s 209
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