| An understanding of the public switched telephone network (PSTN) and how it is potentially going to be replaced is best grasped by understanding its three major components: access, switching, and transport. Access pertains to how a user accesses the network. Switching refers to how a call is “switched” or routed through the network, and transport describes how a call travels or is “transported” over the network.
What, technically speaking, is 802.11b and how does it relate to IEEE 802.11? This chapter covers the technology of transmitting data over the airwaves, the process of that transmission, and the topologies and components of wireless networks. Thousands of enterprises worldwide are “cutting the wires” to their LANs to enjoy greater productivity from their unwired workforce. The 802.11b technology also presents the potential to save money on infrastructure (wiring buildings for networks) and telecommunications services. Because Vo802.11 is VoIP transmitted on 802.11, it is necessary to understand how this transmission medium functions. Just as voice has been transmitted over asynchronous transfer mode (ATM), frame relay, X.25, and the Internet Protocol, it can also be transmitted on 802.11. This chapter discusses how 802.11 works. From this, the reader will gain a better understanding of how 802.11 can be used to transmit voice. |