HighSpeedEthernet

HighSpeedEthernet - High Speed Ethernet Dr. Sanjay P....

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High Speed Ethernet Dr. Sanjay P. Ahuja, Ph.D. Professor School of Computing, UNF
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Hubs and Switches
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3 Hubs and Switches … Shared Medium Hub The total capacity in the shared medium hub configuration (figure 15.12 b) is the same as that of shared bus (figure 15.12 a). Advantages: Exploits standard building wiring practices in cable layout. Maintenance is easier. Uses UTP. Switches Advantages: No change required to software or hardware of attached devices to convert a bus LAN to a switched LAN. Each attached device has a dedicated capacity equal to that of the entire original LAN. Switch scales easily.
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4 LAN Protocols
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5 IEEE 802.3 (Ethernet) Frame Format
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6 IEEE 802.3u ( Fast Ethernet) Operates at 100 Mbps. It is compatible with the regular Ethernet which operates at 10 Mbps and uses CSMA/CD MAC protocol. This is done by reducing the maximum distance between two stations to 250 m as opposed to 2500 m in the Ethernet. The minimum frame size is still 64 bytes as in the Ethernet. Physical Layer options of Fast Ethernet: 100BASE-T is any of several Fast Ethernet standards for twisted pair cables, including: 100BASE-TX (100 Mbps over two-pair Cat5 or better cable) is the predominant form of Fast Ethernet. The segment length for a 100BASE-T cable is limited to 100 m, the same as in Ethernet and Gigabit Ethernet. A typical cat 5 cable contains 4 pairs and can therefore support two 100BASE-TX links. 100BASE-T4 (100 Mbps over four-pair Cat3 or better cable, now defunct). Data stream was split into 3 separate data streams, each with an effective data rate = 331/3 Mbps. 100BASE-FX is a version of Fast Ethernet over optical fiber. It uses a 1300 nm light wavelength transmitted via two strands of optical fiber, one for receive (RX) and the other for transmit (TX). Maximum length is 2 kms for full-duplex over multimode optical fiber.
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7 IEEE 802.3z ( Gigabit) Ethernet Configuration Workgroup represents high-performance workstations and servers. The 100/1000 Mbps hub supports workstations and servers and 100 Mbps hubs via the 100 Mbps links and supports 1-Gbps links for backbone connectivity. Gigabit Ethernet retains the CSMA/CD MAC protocol and frame format as its 10 Mbps and 100 Mbps predecessors.
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8 Gigabit Ethernet Physical Layer Options 1000BASE-LX uses long wavelength laser (1,270–1,355 nm) and is specified to work over a distance of up to 5 km over 10 μm single-mode fiber. This is preferred for campus backbones and similar applications. It can also run over all common types of multi-mode fiber with a maximum segment length of 550 m. 1000BASE-SX
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This note was uploaded on 07/29/2011 for the course CNT 6707 taught by Professor Ahuja during the Spring '11 term at UNF.

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HighSpeedEthernet - High Speed Ethernet Dr. Sanjay P....

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