bài giảng mạng máy tính căn bản chương 7 các công nghệ ethernet ethernet techologies phan vĩnh thuần

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bài giảng mạng máy tính căn bản chương 7 các công nghệ ethernet ethernet techologies phan vĩnh thuần

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Phan Vĩnh Thuần Computer Network 1 CHƯƠNG 7 CÁC CÔNG NGHỆ ETHERNET ETHERNET TECHNOLOGIES Phan Vĩnh Thuần Computer Network 2 Overview • Ethernet has been the most successful LAN technology largely because of its simplicity of implementation compared to other technologies. Ethernet has also been successful because it has been a flexible technology that has evolved to meet changing needs and media capabilities. This module introduces the specifics of the most important varieties of Ethernet. The goal is not to convey all the facts about each type of Ethernet, but rather to develop a sense of what is common to all forms of Ethernet. Phan Vĩnh Thuần Computer Network 3 • Changes in Ethernet have resulted in major improvements over the 10-Mbps Ethernet of the early 1980s. The 10-Mbps Ethernet standard remained virtually unchanged until 1995 when IEEE announced a standard for a 100 Mbps Fast Ethernet. In recent years, an even more rapid growth in media speed has moved the transition from Fast Ethernet to Gigabit Ethernet. The standards for Gigabit Ethernet emerged in only three years. An even faster Ethernet version, 10 Gigabit Ethernet, is now widely available and still faster versions are being developed. Phan Vĩnh Thuần Computer Network 4 • In these faster versions of Ethernet, MAC addressing, CSMA/CD, and the frame format have not been changed from earlier versions of Ethernet. However, other aspects of the MAC sublayer, physical layer, and medium have changed. Copper- based network interface card (NICs) capable of 10/100/1000 operation are now common. Gigabit switch and router ports are becoming the standard for wiring closets. Optical fiber to support Gigabit Ethernet is considered a standard for backbone cabling in most new installations. Phan Vĩnh Thuần Computer Network 5 • Students completing this module should be able to: – Describe the differences and similarities among 10BASE5, 10BASE2, and 10BASE-T Ethernet. – Define Manchester encoding. – List the factors affecting Ethernet timing limits. – List 10BASE-T wiring parameters. – Describe the key characteristics and varieties of 100-Mbps Ethernet Phan Vĩnh Thuần Computer Network 6 – Describe the evolution of Ethernet. – Explain the MAC methods, frame formats, and transmission process of Gigabit Ethernet. – Describe the uses of specific media and encoding with Gigabit Ethernet. – Identify the pinouts and wiring typical to the various implementations of Gigabit Ethernet. – Describe the similarities and differences between Gigabit and 10 Gigabit Ethernet. – Describe the basic architectural considerations of Gigabit and 10 Gigabit Ethernet. Phan Vĩnh Thuần Computer Network 7 7.1.10-Mbps and 100-Mbps Ethernet 7.1.1. 10Mbps Ethernet • 10BASE5, 10BASE2, and 10BASE-T Ethernet are considered Legacy Ethernet. The four common features of Legacy Ethernet are timing parameters, frame format, transmission process, and a basic design rule Phan Vĩnh Thuần Computer Network 8 Phan Vĩnh Thuần Computer Network 9 • 10BASE5, 10BASE2, and 10BASE-T all share the same timing parameters, as shown in the figure (1 bit time at 10 Mbps = 100 nsec = 0.1 µsec = 1 ten-millionth of a second.) Phan Vĩnh Thuần Computer Network 10 • 10BASE5, 10BASE2, and 10BASE-T also have a common frame format. [...]... level Phan Vĩnh Thuần Computer Network 15 • As can be seen from the third and fourth wave forms in the graphic, the binary bit values are indicated by the direction of change during any given bit period The waveform voltage levels at the beginning or end of any bit period are not factors when determining binary values Phan Vĩnh Thuần Computer Network 16 Phan Vĩnh Thuần Computer Network 17 • Legacy Ethernet. .. recommended for new installations Phan Vĩnh Thuần Computer Network 21 • 10BASE5 systems are inexpensive and require no configuration, but basic components like NICs are very difficult to find as well as the fact that it is sensitive to signal reflections on the cable 10BASE5 systems also represent a single point of failure Phan Vĩnh Thuần Computer Network 22 Phan Vĩnh Thuần Computer Network 23 • 10BASE5... becomes easier to violate maximum delay limits as the network grows Phan Vĩnh Thuần Computer Network 18 • The timing limits are based on parameters such as: – Cable length and its propagation delay – Delay of repeaters – Delay of transceivers – Interframe gap shrinkage – Delays within the station Phan Vĩnh Thuần Computer Network 19 • 10-Mbps Ethernet operates within the timing limits offered by a series... favorable and this prolonged its use in certain applications Phan Vĩnh Thuần Computer Network 24 • Because the medium is a single coaxial cable, only one station can transmit at a time or else a collision will occur Therefore, 10BASE5 only runs in halfduplex resulting in a maximum of 10 Mbps of data transfer Phan Vĩnh Thuần Computer Network 25 7. 1.3 10 BASE2 • 10BASE2 was introduced in 1985 Installation... stranded central conductor Each of the maximum five segments of thin coax may be up to 185 meters long and each station is connected directly to the BNC “T” connector on the coax Phan Vĩnh Thuần Computer Network 27 Phan Vĩnh Thuần Computer Network 28 • Only one station can transmit at a time or else a collision will occur 10BASE2 also uses half-duplex The maximum transmission rate of 10BASE2 is 10 Mbps... stations attached Interactive Media Activity Phan Vĩnh Thuần Computer Network 29 7. 1.4 10BASE-T • 10BASE-T was introduced in 1990 10BASE-T used cheaper and easier to install Category 3 unshielded twisted pair (UTP) copper cable rather than coax cable The cable plugged into a central connection device that contained the shared bus This device was a hub Phan Vĩnh Thuần Computer Network 30 • It was at the... 33 Interactive Media Activity Phan Vĩnh Thuần Computer Network 34 7. 1.5 10BASE-T wiring and architecture • 10BASE-T links generally consist of a connection between the station and a hub or switch Hubs are multi-port repeaters and count toward the limit on repeaters between distant stations Hubs do not divide network segments into separate collision domains Phan Vĩnh Thuần Computer Network 35 • Because... protocols without rewiring Phan Vĩnh Thuần Computer Network 32 • The figure shows the pinout arrangement for a 10BASE-T connection The transmitting pair on the receiving side are connected to the receiving pair on the attached device • Half duplex or full duplex is a configuration choice 10BASE-T carries 10 Mbps of traffic in half-duplex mode and 20 Mbps in full-duplex mode Phan Vĩnh Thuần Computer Network... stations There can also be no more than three populated segments between any two distant stations Phan Vĩnh Thuần Computer Network 20 7. 1.2 10Base5 • The original 1980 Ethernet product 10BASE5 transmitted 10 Mbps over a single thick coaxial cable bus 10BASE5 is important because it was the first medium used for Ethernet 10BASE5 was part of the original 802.3 standard The primary benefit of 10BASE5 was length... as an extended star topology Originally 10BASE-T was a half-duplex protocol, but full-duplex features were added later The explosion in the popularity of Ethernet in the mid-to-late 1990s was when Ethernet came to dominate LAN technology Phan Vĩnh Thuần Computer Network 31 • 10BASE-T also uses Manchester encoding A 10BASE-T UTP cable has a solid conductor for each wire in the maximum 90 meter horizontal . Phan Vĩnh Thuần Computer Network 1 CHƯƠNG 7 CÁC CÔNG NGHỆ ETHERNET ETHERNET TECHNOLOGIES Phan Vĩnh Thuần Computer Network 2 Overview • Ethernet has been the most successful. 10 Gigabit Ethernet. Phan Vĩnh Thuần Computer Network 7 7.1.10-Mbps and 100-Mbps Ethernet 7. 1.1. 10Mbps Ethernet • 10BASE5, 10BASE2, and 10BASE-T Ethernet are considered Legacy Ethernet. The. Phan Vĩnh Thuần Computer Network 10 • 10BASE5, 10BASE2, and 10BASE-T also have a common frame format. Phan Vĩnh Thuần Computer Network 11 Phan Vĩnh Thuần Computer Network 12 • The Legacy Ethernet

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