Alvarion BreezeACCESS 4900 Specifications Page 190
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Chapter 4 - Operation and Administration Menus and Parameters
BreezeACCESS 4900 164 System Manual
4.2.6.5.1 RTS Threshold
The RTS Threshold parameter defines the minimum frame size that requires an
RTS/CTS (Request To Send/Clear To Send) handshake. Frames whose size is
smaller than the RTS Threshold value are transmitted directly to the wireless link
without being preceded with RTS frames. Setting this parameter to a value larger
than the maximum frame size eliminates the RTS/CTS handshake for frames
transmitted by this unit.
The available values range from 20 to 4092 bytes for units with HW revision C or
higher, and 20 to 2200 for units with HW revision A or B.
The default value is 60 bytes for SUs.
For AUs with HW revision C or higher, the default is 4092, and for AUs with HW
revision A or B the default is 2200. For AUs the default is 4092. It is
recommended that these values be used to ensure that RTS/CTS is never used in
the AU.
4.2.6.5.2 Minimum Contention Window
The Minimum Contention Window parameter determines the time that a unit
waits from the time it has concluded that there are no detectable transmissions by
other units until it attempts to transmit. The BreezeACCESS 4900 system uses a
special mechanism based on detecting the presence of a carrier signal and
analyzing the information contained in the transmissions of the AU to estimate
the activity of other SUs served by the AU. The target is to minimize collisions in
the wireless medium resulting from attempts of more than one unit to transmit at
the same time.
The system uses an exponential Back-off algorithm to resolve contention between
several units that want to access the wireless medium. The method requires each
station to choose a random number N between 0 and a given number C each time
it wants to access the medium. The unit will attempt to access the medium only
after a time equal to DIFS (for more details refer to “Arbitration Inter-Frame
Spacing (AIFS)” on page 127) plus N time slots, always checking if a different unit
has accessed the medium before. Each time the unit tries to transmit and a
collision occurs; the maximum number C used for the random number selection
will be increased to the next available value. The available values are 7, 15, 31,
63, 127, 255, 511 and 1023.
The Minimum Contention Window parameter is the first maximum number C
used in the back-off algorithm. The higher the number of SUs served by the same
AU, the higher the Minimum Contention Window for each SU should be. In
addition, when the Wireless Link Prioritization Option is enabled, the Minimum
and Maximum Contention Window parameters can be configured to provide
certain units with an advantage over other units.
- BreezeACCESS 1
- System Manual 1
- Document History 2
- Legal Rights 11
- Disclaimer 12
- Limitation of Liability 13
- Electronic Emission Notices 13
- FCC Radiation Hazard Warning 14
- Antenna Compliance Statement 14
- Safety Considerations 14
- Line Voltage 15
- Important Notice 16
- About this Manual 18
- Appendix F - Troubleshooting 19
- Contents 20
- System Description 27
- In This Chapter: 28
- 1.2 Base Station Equipment 31
- 1.3 Subscriber Unit 34
- 1.4 DC Power Injector 35
- 1.6 Networking Equipment 38
- 1.7 Management Systems 39
- 1.8 Specifications 41
- 1.8.2 Data Communication 42
- 1.8.5 Physical and Electrical 44
- 1.8.5.1.2 Connectors 45
- 1.8.5.1.3 Electrical 45
- 1.8.5.2.1 Mechanical 45
- 1.8.5.2.2 Connectors 46
- 1.8.5.2.3 Electrical 46
- 1.8.5.3.1 Mechanical 47
- 1.8.5.3.2 Connectors 47
- 1.8.5.3.3 Electrical 48
- 1.8.7 Environmental 49
- Installation 50
- 2.1 Installation Requirements 52
- 2.1.1.2.2 AU-E-BS Access Unit 53
- Figure 2-3: 61
- Equipment 68
- Commissioning 74
- 3.1.1 Initial Configuration 76
- Section 3.3 77
- Table 3-1: Basic Parameters 77
- 3.1.2 Country Code Selection 78
- Maximum Modulation Level 82
- 3.4 Operation Verification 84
- Base station) 87
- (Modular Base Station) 87
- Operation and Administration 88
- 4.1.2 Common Operations 92
- 4.2 Menus and Parameters 93
- 4.2.2.1 Show Unit Status 94
- 4.2.3 Unit Control Menu 99
- 4.2.3.1 Reset Unit 100
- 4.2.3.2 Default Settings 100
- 4.2.3.2.1 Set Defaults 101
- Parameters Group Parameter 103
- 4.2.3.3 Change Unit Name 105
- 4.2.3.4 Change Password 105
- 4.2.3.5 Flash Memory Control 105
- 4.2.3.6 Log Out Timer 106
- 4.2.3.9 Event Log Menu 107
- 4.2.3.9.4 Event Log Upload 108
- 4.2.3.10 Feature Upgrade 109
- 4.2.3.11 SW Version Download 110
- 4.2.3.13 LED Mode 113
- 4.2.3.13.2.1 LED 1 to 8 114
- 4.2.3.13.2.1.1Threshold Type 114
- 4.2.3.13.2.1.2Threshold Mode 114
- 4.2.4.1 IP Parameters 115
- 4.2.5 Site Survey Menu 118
- 4.2.5.1 Traffic Statistics 119
- 4.2.5.1.2 WLAN Counters 120
- » Beacons (AU only) 121
- 4.2.5.2 Ping Test 124
- SNR_Memory_Factor 125
- 4.2.5.4 MAC Address Database 126
- ◊ The MAC address of the AU 127
- ◊ The MAC address of the SU 131
- 4.2.5.8 Link Capability 133
- 4.2.6.1 IP Parameters 135
- 4.2.6.1.4 DHCP Client 136
- 4.2.6.1.5 Show IP Parameters 137
- 4.2.6.2.1 ESSID Parameters 137
- 4.2.6.2.1.1 ESSID 139
- 4.2.6.2.1.2.2 Operator ESSID 139
- 4.2.6.2.3.1 Sub-Band Select 141
- 4.2.6.2.3.2 Frequency 141
- 4.2.6.2.4.1 Sub-Band Select 141
- 4.2.6.2.5.1 Best AU Support 143
- 4.2.6.2.7.1 Transmit Power 146
- 4.2.6.2.7.1.1 Transmit Power 146
- 4.2.6.2.7.4.1 ATPC Option 149
- 4.2.6.2.8 Antenna Gain 150
- 4.2.6.2.9.3 Fairness Factor 152
- 4.2.6.2.13 Spectrum Analysis 155
- 4.2.6.2.16.4 OFDM Weak Signal 159
- 4.2.6.2.17.1 Calculation Mode 160
- 4.2.6.2.17.2 Forced Value 161
- 4.2.6.2.18.1 Run Calibration 161
- 4.2.6.3.7.1 Send SNMP Traps 166
- 4.2.6.4 Bridge Parameters 167
- 4.2.6.4.1 VLAN Support 168
- 4.2.6.4.1.3 VLAN Link Type 171
- 4.2.6.4.1.3.2 Trunk Link 171
- 4.2.6.4.1.3.3 Hybrid Link 172
- 4.2.6.4.1.9.1 VLAN Rule # 179
- 4.2.6.4.1.9.2 Show Rule List 183
- 4.2.6.4.2.1 Filter Options 183
- 4.2.6.4.4 Bridge Aging Time 186
- 4.2.6.5.1 RTS Threshold 190
- 4.2.6.5.9 Burst Mode 194
- 4.2.6.5.9.1 Burst Mode Option 195
- 4.2.6.6 Service Parameters 202
- 4.2.6.6.3.2.3 DSCP Threshold 211
- » RTP & RTCP 212
- » RTP Only 212
- 4.2.6.6.3.3.3 TCP Port Ranges 213
- 4.2.6.6.3.4.3 IP Range Mask 215
- 4.2.6.6.4.1 DRAP Support 219
- 4.2.6.6.4.2 UDP Port 219
- 4.2.6.6.4.4 DRAP TTL 219
- 4.2.6.7 Security Parameters 220
- 4.2.6.7.3 Security Mode 221
- 4.2.6.7.6 Key # 1 to Key # 4 222
- 4.2.6.8.1 Select Country Code 223
- Appendix 224
- Main Version Number :4.5.16 227
- Shadow Version Number :5.0.13 227
- SU Cable 233
- Parameters Summary 236
- In This Appendix: 237
- E.1 Parameters Summary 238
- E.1.2 IP Parameters 240
- E.1.5 Bridge Parameters 244
- E.1.6 Performance Parameters 247
- E.1.7 Service Parameters 248
- E.1.8 Security Parameters 251
- Troubleshooting 252
- F.2 SU Association Problems 255
- F.3 Low Throughput Problems 256
- SNR Maximum Modulation Level 257
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