Cisco 4G-LTE-ANTM-O-3 Installation Guide Page 239
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What to Do Next
Enabling Short Slot Time for 802.11g Radios
You can increase throughput on the 802.11g 2.4-GHz radio by enabling short slot time. Reducing the slot
time from the standard 20 microseconds to the 9-microsecond short slot time decreases the overall backoff,
which increases throughput. Backoff, which is a multiple of the slot time, is the random length of time that a
station waits before sending a packet on the LAN.
Many 802.11g radios support short slot time, but some do not. When you enable short slot time, the wireless
device uses the short slot time only when all clients associated to the 802.11g 2.4-GHz radio support short
slot time.
Short slot time is supported only on the 802.11g 2.4-GHz radio. Short slot time is disabled by default.
In radio interface mode, enter the short-slot-time command to enable short slot time:
ap(config-if)# short-slot-time
Use the no form of the short-slot-time command to disable short slot time.
Performing a Carrier Busy Test
You can perform a carrier busy test to check the radio activity on wireless channels. During the carrier busy
test, the wireless device drops all associations with wireless networking devices for 4 seconds while it conducts
the carrier test and then displays the test results.
In privileged EXEC mode, enter this command to perform a carrier busy test:
dot11 interface-number carrier busy
For interface-number, enter dot11radio 0 to run the test on the 2.4-GHz radio
Use the show dot11 carrier busy command to redisplay the carrier busy test results.
Configuring VoIP Packet Handling
You can improve the quality of VoIP packet handling per radio on access points by enhancing 802.11 MAC
behavior for lower latency for the class of service (CoS) 5 (Video) and CoS 6 (Voice) user priorities.
To configure VoIP packet handling on an access point, follow these steps:
1
Using a browser, log in to the access point.
2
Click Services in the task menu on the left side of the web-browser interface.
3
When the list of Services expands, click Stream.
The Stream page appears.
4
Click the tab for the radio to configure.
5
For both CoS 5 (Video) and CoS 6 (Voice) user priorities, choose Low Latency from the Packet Handling
drop-down menu, and enter a value for maximum retries for packet discard in the corresponding field.
Cisco 800 Series Integrated Services Routers Software Configuration Guide
OL-31704-02 211
Configuring Wireless Devices
Enabling Short Slot Time for 802.11g Radios
- Americas Headquarters 1
- CONTENTS 3
- OL-31704-02 v 5
- OL-31704-02 vii 7
- OL-31704-02 ix 9
- Contents 10
- OL-31704-02 xi 11
- OL-31704-02 xiii 13
- OL-31704-02 xv 15
- OL-31704-02 xvii 17
- OL-31704-02 xix 19
- Error Reporting 407 21
- Exiting the ROM Monitor 409 21
- Audience 23
- Document Organization 23
- Document Conventions 25
- OL-31704-02 xxvii 27
- Product Overview 29
- 2 OL-31704-02 30
- OL-31704-02 3 31
- Cisco 880 Series ISRs 33
- 6 OL-31704-02 34
- OL-31704-02 7 35
- Cisco 890 Series ISRs 36
- Cisco 810 Series ISRs 38
- OL-31704-02 11 39
- 12 OL-31704-02 40
- OL-31704-02 13 41
- 14 OL-31704-02 42
- Basic Router Configuration 43
- Default Configuration 44
- 18 OL-31704-02 46
- Configuring Global Parameters 49
- Configuring WAN Interfaces 50
- 24 OL-31704-02 52
- Data Account Provisioning 53
- Configuring DDR 59
- Configuration for 8705 modem 63
- Push Button in WLAN AP 67
- Configuring Static Routes 69
- Configuring Dynamic Routes 70
- Configuring the NID 75
- Ethernet Data Plane Loopback 78
- OL-31704-02 51 79
- 56 OL-31704-02 84
- On router 2: 93
- Subinterface) 99
- SUMMARY STEPS 100
- DETAILED STEPS 100
- Distribution Delay Two-Way: 103
- OL-31704-02 77 105
- 78 OL-31704-02 106
- Configuring Power Management 107
- Configuring Security Features 109
- Configuring AutoSecure 110
- Configuring Access Lists 110
- Access Groups 111
- Configuring Cisco IOS IPS 112
- URL Filtering 112
- Configuring VPN 113
- 86 OL-31704-02 114
- Configuring the IKE Policy 115
- Enabling Policy Lookup 118
- What to Do Next 122
- Management 129
- Configuring Backup Interfaces 130
- Example: 131
- Console or Auxiliary Port 137
- 116 OL-31704-02 144
- OL-31704-02 117 145
- Configuring ISDN Settings 146
- Configuring Auto-Detect 150
- Configuring Third-Party SFPs 151
- Configuring Ethernet Switches 155
- Ethernet Switches 156
- Spanning Tree Protocol 157
- Cisco Discovery Protocol 157
- Switched Port Analyzer 157
- IGMP Snooping 157
- Overview of SNMP MIBs 158
- Configuring VLANs 160
- 134 OL-31704-02 162
- OL-31704-02 135 163
- Configuring IGMP Snooping 164
- Managing the Switch 165
- Configuring Static Addresses 166
- Voice Ports 167
- Call Control Protocols 168
- Dial Peer Configuration 169
- Other Voice Features 169
- 142 OL-31704-02 170
- Fax Services 171
- 144 OL-31704-02 172
- CHAPTER 9 173
- Legacy Protocol Transport 174
- Configuring Serial Interfaces 175
- Multilink PPP 176
- Keepalive Timer 177
- Frame Relay Encapsulation 177
- Configuring PPP 180
- Configuring Bisync 180
- Enabling the Internal Clock 182
- Setting Transmit Delay 183
- 158 OL-31704-02 186
- OL-31704-02 159 187
- 160 OL-31704-02 188
- Tuning Half-Duplex Timers 190
- 166 OL-31704-02 194
- Configuring Wireless Devices 195
- Root Access Point 196
- OL-31704-02 169 197
- Cisco ScanSafe 198
- OL-31704-02 171 199
- 172 OL-31704-02 200
- Closing the Session 204
- Configuring Wireless Settings 205
- Cisco Express Setup 205
- Configuring Authentication 206
- OL-31704-02 179 207
- Preparing for the Upgrade 210
- Performing the Upgrade 211
- Related Documentation 212
- OL-31704-02 185 213
- Configuring Radio Settings 214
- Radio Tracking 217
- Fast Ethernet Tracking 217
- Overview of Radio Data Rates 218
- Configuring Radio Data Rates 219
- Configuring MCS Rates 221
- 194 OL-31704-02 222
- Enabling World Mode 227
- Transmit and Receive Antennas 229
- Disabling Aironet Extensions 231
- Configuring Protected Ports 234
- Beacon Period and the DTIM 235
- RTS Threshold and Retries 236
- Maximum Data Retries 237
- Configuring WLAN 240
- Displaying Device Information 241
- 214 OL-31704-02 242
- Configuring Security 243
- Configuring MAC Filtering 243
- 216 OL-31704-02 244
- OL-31704-02 217 245
- Station Information 246
- WLAN CLI Interface 247
- Enabling and Disabling WLAN 250
- Configuring the Main SSID 250
- Configuring Guest SSIDs 251
- Hiding an Access Point 252
- Configuring Radio Channel 265
- Configuring 802.11n Options 266
- Configuring the 54g Mode 268
- Configuring the 54g Rate 270
- Configuring 54g Protection 271
- Configuring the Basic Rate 272
- Configuring the RTS Threshold 274
- Configuring the DTIM Interval 274
- Configuring WMM Options 276
- Displaying CPU Statistics 284
- Pinging an Address 286
- OL-31704-02 261 289
- RADIUS Configuration 296
- Defining AAA Server Groups 297
- Default TACACS+ Configuration 301
- Rebooting the Wireless Device 305
- Configuring SNTP 306
- 280 OL-31704-02 308
- Configuring a System Name 310
- Understanding DNS 310
- Creating a Banner 313
- Configuring a Login Banner 314
- Setting up the DHCP Server 321
- Understanding SSH 324
- Configuring SSH 324
- Client ARP Caching 325
- CHAPTER 11 327
- Overview 328
- Configuration Tasks 329
- Configuration Example 336
- Verifying Your Configuration 337
- 310 OL-31704-02 338
- 312 OL-31704-02 340
- Configuring ADSL 344
- Verifying the Configuration 345
- CHAPTER 13 351
- Cisco EnergyWise Support 352
- 4G LTE Wireless WAN 353
- Modem Firmware Upgrade 356
- Troubleshooting 356
- CHAPTER 15 357
- Configuring DHCP and VLANs 358
- Configuration Example: DHCP 360
- CHAPTER 16 365
- 338 OL-31704-02 366
- CHAPTER 17 379
- 352 OL-31704-02 380
- Restrictions 381
- Configuration Examples 385
- Deployment Scenarios 387
- Enterprise Small Branch 388
- OL-31704-02 361 389
- SMB Applications 390
- OL-31704-02 363 391
- 364 OL-31704-02 392
- Getting Started 393
- ADSL Troubleshooting 394
- SHDSL Troubleshooting 394
- VDSL2 Troubleshooting 395
- ATM Troubleshooting Commands 397
- Router# debug atm errors 399
- OL-31704-02 371 399
- Software Upgrade Methods 402
- Recovering a Lost Password 402
- Reset the Router 404
- 380 OL-31704-02 408
- APPENDIX A 409
- Understanding Command Modes 410
- OL-31704-02 383 411
- Getting Help 412
- Using Commands 414
- Abbreviating Commands 415
- Undoing Commands 415
- Command-Line Error Messages 415
- Saving Configuration Changes 416
- Concepts 417
- Network Protocols 418
- Routing Protocol Options 418
- PPP Authentication Protocols 419
- 392 OL-31704-02 420
- Network Address Translation 421
- Easy IP (Phase 1) 421
- Easy IP (Phase 2) 422
- Network Interfaces 422
- ATM for DSL 423
- Dialer Interface 423
- Dial Backup 424
- IP Precedence 425
- Access Lists 426
- ROM Monitor 427
- ROM Monitor Commands 428
- Required Variables 431
- Optional Variables 431
- Configuration Register 433
- Console Download 434
- ROM Monitor Debug Commands 435
- Exiting the ROM Monitor 437
- 410 OL-31704-02 438
- OL-31704-02 IN-1 439
- IN-2 OL-31704-02 440
- OL-31704-02 IN-3 441
- IN-4 OL-31704-02 442
- OL-31704-02 IN-5 443
- IN-6 OL-31704-02 444
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