Download 92313-vG System Description

System Description
Ascom VoWiFi System
TD 92313EN
Contents
1 Introduction .................................................................................................................... 2
1.1 Abbreviations and Glossary ................................................................................... 2
2 WLAN............................................................................................................................... 6
2.1 WLAN Infrastructure ............................................................................................... 6
2.1.1 Autonomous Access Points ........................................................................... 6
2.1.2 Controller-Based Access Points ..................................................................... 7
2.2 RF Modulation Standard.......................................................................................... 7
2.2.1 802.11b/g RF Modulation Standard .............................................................. 7
2.2.2 802.11a RF Modulation Standard .................................................................. 8
2.2.3 802.11n RF Modulation Standard .................................................................. 9
2.3 Access Control and Security .................................................................................. 12
2.3.1 ESSID (Extended Service Set Identifier)........................................................ 12
2.3.2 MAC Address Filtering .................................................................................. 12
2.3.3 WEP............................................................................................................... 13
2.3.4 WPA™ ........................................................................................................... 13
2.3.5 WPA2™ ......................................................................................................... 13
2.3.6 Proactive Key Caching (Opportunistic Key Caching) .................................... 14
2.3.7 Certificate-Based Authentication ................................................................. 14
2.4 Quality of Service (QoS) ........................................................................................ 15
2.4.1 802.11e ........................................................................................................ 15
2.4.2 WMM™ (WME™) ........................................................................................... 15
2.4.3 TSPEC Call Admission Control ....................................................................... 16
2.4.4 WMM™ Power Save ...................................................................................... 16
2.5 Cisco Compatible Extensions (CCX) ....................................................................... 16
2.6 802.11h................................................................................................................. 16
3 VoWiFi ........................................................................................................................... 17
3.1 VoIP Signalling Protocols....................................................................................... 17
3.1.1 H.323 ............................................................................................................ 17
3.1.2 H.450 Supplementary Services for H.323.................................................... 17
3.1.3 Session Initiation Protocol (SIP) ................................................................... 17
3.2 VoWiFi Standards .................................................................................................. 18
4 Ascom VoWiFi System Overview................................................................................. 18
4.1 Supported Standards ............................................................................................ 20
4.1.1 VoWiFi Handset ............................................................................................ 20
4.2 System Functions .................................................................................................. 20
7 September 2011 / Ver. G