Alvarion BreezeACCESS 4900 Specifications Page 256
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Appendix F - Troubleshooting Low Throughput Problems
BreezeACCESS 4900 230 System Manual
F.3 Low Throughput Problems
* The throughput results are for net TCP traffic (excluding protocols overheads)
Table F-3: Low Throughput Problems
Problem and Indication Possible Cause Corrective Action
Low throughput is suspected
(Check the dominant
Modulation Level in Per rate
Counters and see expected
throughput in the "Expected
Throughput" table below)
Ethernet link problems
Verify proper settings of Ethernet operation mode
(actual Ethernet speed of 100 Mbps).
Check Ethernet counters
Wrong configuration of
Maximum Modulation
level
Verify that Maximum Modulation level is not set to a
value that is not too low according to the
"Recommended Maximum Modulation Level" table
below.
Low throughput of
multicast/broadcast traffic
Non-optimal
configuration of
Multicast Modulation
level
A value that is too low (see the "Recommended
Maximum Modulation Level" table below) may
degrade throughput of broadcast and multicast
traffic.
High retransmissions rate Interference problems
(retransmissions rate
in excess of 15%)
Check for interference using the Spectrum Analysis
Mode. If necessary, change the operating frequency
of the AU.
Table F-4: Expected Throughput in Mbps, TCP session @ 10 MHz Bandwidth Burst Mode Enabled,
Concatenation Enabled
Modulation Level Uplink Downlink Aggregate
(Bi-directional)
1 2.5 2.3 2.4
2 3.5 3.2 3.5
3 4.8 4.7 4.8
4 6.9 6.6 6.9
5 8.8 8.9 9.1
6 12.1 12.7 12.8
7 15.3 17.1 16.3
8 16.6 18.6 17.8
- 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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