TAILIEUCHUNG - ADC KRONE - Guide - Fundamentals of Ethernet Technology
Tham khảo tài liệu 'adc krone - guide - fundamentals of ethernet technology', công nghệ thông tin, quản trị mạng phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | WHITE PAPER WHITE Fundamentals of Ethernet Technology Fundamentals of Ethernet Technology This white paper provides a brief tutorial on Ethernet – a family of standards that defines several well-established 10 Mbps networking technologies and three newer, high-speed offerings, Fast Ethernet, Gigabit Ethernet, and 10 Gigabit Ethernet. It is intended for carrier network professionals, experts in the circuit- switched technologies employed in public switched telephone networks (PSTN) but often new to Ethernet and data networking. Why Study Ethernet? Ethernet is becoming an important carrier network technology. For many years, it was relegated to office LANs (local area network), connecting PCs, servers, and printers. Recent high-speed implementations, however, make Ethernet a viable candidate to provide new carrier-based services such as: • Voice over IP (VoIP), a technology that enables voice calls over data networks. This may one day eliminate the need for separate voice and data facilities. • Metropolitan area networks (MANs), high-bandwidth pipes that can link company data centers over a 15 to 20 mile area • Ethernet in the First Mile (EFM), an emerging standard that may compete with DSL and cable modems to bring voice, video, and data to homes The PSTN and Ethernet The PSTN and Ethernet were designed for very different purposes. The result is different technologies, at least in two key areas: switching techniques and network access methods. Circuit-Switching: A Voice-Friendly Technology Have you ever heard a television news anchor question a distant reporter over a satellite link? You probably have, and it’s quite likely that the moments of dead air between the question and the response made you uncomfortable. That’s what latency does to conversation. Designers of the public telephone network understood this, so they created circuit-switched networks to minimize it. In these networks, an end-to-end circuit is established (Figure 1) before a conversation begins, .
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