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CCNA 1 Chapter 6 , Part 1 Ethernet Technologies. By Your Name. Objectives. 10 Mbps and 100 Mbps 1000 Mbps and Gigabit Ethernet. Ethernet Family Tree. 10 Mbps Ethernet. 10BASE - 5, 10BASE - 2, and 10BASE-T Ethernet are considered Legacy Ethernet. - PowerPoint PPT Presentation
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CCNA 1 Chapter 6, Part 1
Ethernet Technologies
By
Your Name
Copyright 2003 www.ciscopress.com
Objectives
• 10 Mbps and 100 Mbps
• 1000 Mbps and Gigabit Ethernet
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Ethernet Family Tree
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10 Mbps Ethernet
• 10BASE-5, 10BASE-2, 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.
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10BASE-5
• 10BASE-5 systems also represent a single point of failure.
• 10BASE-5 uses Manchester encoding.
• Each of the maximum 5 segments of thick coax may be up to 500 meters in length.
• The cable is large, heavy, and difficult to install.
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10BASE-2
• 10BASE-2 also uses Manchester encoding. • Only 1 station can transmit at a time; otherwise a
collision will occur. • It uses half duplex. • The maximum transmission rate is 10 Mbps. • There may be up to 30 stations on any individual
10BASE-2 segment.
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10BASE-T
• 10BASE-T also uses Manchester encoding.• 10BASE-T uses cheaper and easier-to-install
Category 3 unshielded twisted-pair (UTP) copper cable rather than coax cable.
• 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.
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10BASE-T Wiring and Architecture
• 10BASE-T links generally consist of a connection between the station and a hub or switch.
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100 Mbps
• 100 Mbps Ethernet is also known as Fast Ethernet.
• The two technologies that became important are 100BASE-TX, which is copper UTP based, and 100BASE-FX, which is multimode optical fiber based.
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1000BASE-TX
• 100BASE-TX uses 4B/5B encoding, which is then scrambled and converted to multilevel transmit-3 levels or MLT-3.
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1000BASE-FX
• A fiber version desired for backbone applications as well as connections between floors and buildings where copper is less desirable, and also in high noise environments
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Fast Ethernet Architecture
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1000 Mbps and 10 Gigabit Ethernet
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1000 Mbps Ethernet
• The 1000 Mbps Ethernet or Gigabit Ethernet standards represent transmission using both fiber and copper media.
• The 1000BASE-X standard (IEEE 802.3z) specifies a 1-Gbps full duplex over optical fiber.
• The 1000BASE-T standard (IEEE 802.3ab) uses a media of Category 5 or higher UTP.
• 1000BASE-TX, 1000BASE-SX, and 1000BASE-LX use the same timing parameters.
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1000BASE-T
• 1000BASE-T standard is interoperable with 10BASE-T and 100BASE-TX.
• 1000BASE-T uses all 4 pairs of wires instead of the traditional 2 pairs of wires used by 10BASE-T and 100BASE-TX.– This provides 250 Mbps per pair. With all 4 wire pairs,
this provides the desired 1000 Mbps.
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1000BASE-SX and LX
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Gigabit Ethernet Architecture
• Daisy-chaining, star, and extended star topologies are all allowed.
• It is recommended that all links between a station and a hub or switch be configured for autonegotiation to permit the highest common performance.
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10 Gigabit Ethernet
• IEEE 802.3ae was adapted to include 10-Gbps full-duplex transmission over fiber-optic cable.
• When using single-mode fiber as the transmission medium, the maximum transmission distance is 40 kilometers (25 miles).
• Some discussions between IEEE members have begun that suggest the possibility of standards for 40-, 80-, and even 100-Gbps Ethernet.
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10 Gigabit Ethernet Architectures
• 10 Gigabit Ethernet uses two separate encoding steps.
• The encoded data provides synchronization, efficient usage of bandwidth, and improved signal-to-noise ratio characteristics.
• All 10GbE varieties use optical fiber media.
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Future of Ethernet
• Ethernet has gone through an evolution from Legacy → Fast → Gigabit → MultiGigabit technologies.
• The future of networking media is threefold: – Copper (up to 1000
Mbps, perhaps more) – Wireless (approaching
100 Mbps, perhaps more)
– Optical fiber (currently at 10,000 Mbps and soon to be more)
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