voice over 802.11

[...]... commonly used ATM services 1 LAN Emulation, used for emulation of standard LANs like Ethernet and Token Ring 2 Classical IP and ARP over ATM, used for handling TCP/IP traffic over ATM networks 3 Multiprotocol over ATM, is a mechanism for handling ISO layer 3 protocols transparanet over ATM 18 Ch 4 - WAN, Wide Area Networks When information needs to be sent, the sender negotiates a "requested path" with the... would be similar to determining a method of delivery using US mail One can choose to send 1st class, overnight or budget delivery 19 Ch 4 - WAN, Wide Area Networks Classical IP and ARP over ATM, is a way of making the TCP/IP traffic run over ATM in the most efficient manner possible ATM IP and ARP over ATM service is used by the host and the router in the picture Both the host and the router must usually... traffic characteristics, for instance continuous or bursty, and different system requirements like real time voice and video applications or normal data traffic There are four types of AAL: AAL-1: ATM Adaptation Layer Type 1 offers support for constant bit rate and timedependent traffic such as voice and video AAL-2: ATM Adaptation Layer Type 2 is a placeholder for variable bit rate video transmission,... Relay's maximum speed to 45 Mbps Frame Relay services offer flexible bandwidth over the public network This flexibility is provided through two parameters: CIR, which stands for Committed Information Rate AR, which stands Access Rate The CIR establishes the minimum amount of bandwidth that will be available If the public network gets overloaded, various mechanisms come into play to ensure the CIR is available... use your LAN for different kinds of services, like voice, video and data 13 Ch 4 - WAN, Wide Area Networks ATM is not only used for data communication but also for telecommunication ATM is available at various speeds The most commonly used are 25, 155 and 622 Mbps 14 Ch 4 - WAN, Wide Area Networks The physical layer provides for transmission of cells over a physical medium This physical layer consists... the router must usually be equiped with an ATM network interface card 20 Ch 4 - WAN, Wide Area Networks The ATM Forum's Multiprotocol over ATM (MPOA) specification is the industry's first standard based solution that allows transport of ”Layer 3” protocols transparent over ATM networks At the same time MPOA takes the advantage of the specific benefits that ATM offers, like lower latency, high performance... Frame Relay However, the death of frame Relay will not come about rapidly The advantages of Frame Relay are 1 High bandwidth 2 High capacity 3 Handles much more transferred data than X.25 due to less ”overhead” 4 One physical connection but many logical connections The disadvantages of Frame Relay are 1 An error is detected later than in X.25 2 Not as fast as ATM 12 Ch 4 - WAN, Wide Area Networks ATM... but seen from the LAN side the LANE solution is totally transparent 23 Ch 4 - WAN, Wide Area Networks What will the future hold for ATM? 1 ATM will provide a single network for all types of traffic like voice, data, video and so on This will give improved efficiency and manageability since you only have to manage one network instead of several 2 Because ATM is not based on a specific type of physical . 109 Repudiation 111 Network Architecture 111 Mobility and Security 113 Security Policy: A Range of Options 113 802. 11 Security Measures Beyond WEP 114 Wi-Fi Protected Access 114 802. 1x and EAP. 182 xii Voice over 802. 11 11 Vo802 .11 Reliability 183 Understanding Reliability 183 How Availability Is Calculated 184 Reliability in Wireless Access in a Vo802 .11 Network 186 Redundancy in Vo802 .11. connection to an IP backbone. Vo802 .11: Bypassing the Local Loop The emergence of voice over 802. 11 (Vo802 .11) was made possible by simply moving VoIP over 802. 11 as an access mechanism, thereby