Abstract
In contrast to public or sometimes mixed ownership WAN infrastructure, a Local Area Network (LAN) is usually owned by a single enterprise, the one that is actually using the network for its business purposes. Commonly, a LAN is designed to carryout much greater communications load and greater information bandwidth, often beyond 4-10 Mbps data rate (e.g. 10/100 Mbps is common Fast Ethernet data-rate.). In fact, it is to provide networking infrastructure for common data processing, data packet routing, and switching as in case of ATM switching hubs, digital data switching boards in CSN, and to support plain old telephone (POT) and digital voice communications used by the PBX. Naturally, LAN design is often influenced by rapid changes in IT and ubiquitous application of modern digital technology. As mentioned earlier in Computer Telephony Integration topics, the convergence trends of IT currently play important role in the choice of suitable enterprise LAN.
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