What Is Ethernet | Part 2

What Is Ethernet | Part 2

Varieties of Ethernet

Besides the frame types mentioned above, most of the differences between the varieties of Ethernet are summarized in variations of speed and cabling. Therefore, in general, the stack of network protocol software will work identically on most types below.

The following sections provide a brief summary of all the official Ethernet media types. In addition to these standards, many vendors have implemented proprietary media types for various reasons, often to support longer distances over fiber optic cabling.

Some early varieties of Ethernet

  • Xerox Ethernet – the original Ethernet implementation, which had two versions, Version 1 and Version 2, during its development. The frame format of version 2 is still in common use.
  • 10BASE5 (also called Thicknet) – this early IEEE standard uses a single coaxial cable that you could literally sticking a connection cable to connect to the core. It is an obsolete, though due to its widespread deployment in the past, may still be used by some systems.
  • 10BROAD36 – Obsolete. An early standard supporting Ethernet over longer distances. Modulation techniques used broadband similar to those employed in cable modem systems, and operated over coaxial cable.
  • * 1BASE5 – An early attempt to standardize a solution of low-cost LAN operates at 1 Mbit / s and was a commercial failure.
  • StarLAN 1-The first implementation of Ethernet on twisted pair wiring.

10 Mbit / s Ethernet

  • 10BASE2 (also called ThinNet or Cheapernet) – A coaxial cable connects the 50-ohm machines, each using a T adapter to connect your NIC. Requires terminators at each end. For many years this was the dominant standard Ethernet 10 Mbit / s.
  • 10BASE5 (also called Thicknet) – Specification baseband Ethernet 10 Mbps, which uses the standard (thick) coaxial cable-based band of 50 ohms. It is part of the specification of physical layer baseband IEEE 802.3, has a maximum distance of 500 meters per segment.
  • 10-StarLAN: First implementation of Ethernet on twisted pair cabling to 10 Mbit / s. This was later evolved into the 10BASE-T.
  • 10BASE-T – runs over 4 wires (two twisted pair) cable in a cat-3 or cat-5. A hub or switch sits in the middle and has a port for each network node. This is also the configuration used for 100BASE-T and Gigabit.
  • FOIRL – Fiber Optic Link between repeaters. This is the original standard for Ethernet over fiber.
  • 10BASE-F – a generic term for a new family of standards for Ethernet 10 Mbit / s 10BASE-FL, 10BASE-FB and 10BASE-FP. Of these only 10BASE-FL is in common use (all using the optical fiber as the physical environment).
  • 10BASE-FL – An updated version of the standard FOIRL.
  • 10BASE-FB – Intended for backbones connecting a number of hubs or switches, is now obsolete.
  • 10BASE-FP – A passive star network that required no repeater, has never been implemented.

Fast Ethernet

* 100BASE-T – A term for any of the three standard for 100 Mbit / s

Ethernet over twisted pair cable.

Includes 100BASE-TX, 100BASE-T4 and 100BASE-T2.

* 100BASE-TX – Uses two pairs, but requires cat-5 cable.

Configuration

” star-shaped identical to 10BASE-T. 100Mbit / s.

* 100BASE-T4 – 100 Mbit / s ethernet over cat-3 cabling (Used in 10BASE-T installations).

Uses all four pairs in the cable. Now obsolete, cat-5 cabling is the default.

Limited Half-Duplex.

* 100BASE-T2 – There are no products.

100 Mbit / s ethernet over cat-3 cabling. Supports full-duplex, and uses only two pairs. It is functionally equivalent to 100BASE-TX, but supports old cable.

* 100BASE-FX – 100 Mbit / s Ethernet over optical fiber. Using 62.5 micron multimode fiber is limited to 400 meters.

Gigabit Ethernet

  • 1000BASE-T – 1 Gbit / s over copper cabling category 5e or 6.
  • 1000BASE-SX – 1 Gbit / s over fiber.
  • 1000BASE-LX – 1 Gbit / s over fiber. Optimized for longer distances over single-mode fiber.
  • 1000BASE-CX – A transport solution for short (up to 25m) to run ethernet 1 Gbit / s in a special copper cable. Precedes the 1000BASE-T and is now obsolete.

10-Gigabit Ethernet

The new 10-gigabit Ethernet standard encompasses seven different media types for LAN, MAN and WAN. He is currently specified by a supplementary standard, IEEE 802.3ae, and will be incorporated into a future version of IEEE 802.3.

* 10GBASE-SR – designed to support short distances over fiber cabling, multi-mode, ranging from 26m to 82m depending on the type of cable. It also supports operation in the 300m multi-mode fiber of 2000 MHz

* 10GBASE-LX4 – uses division multiplexing wavelengths to support distances between 240m and 300m in multi-mode cabling. Also supports 10 km with single-mode fiber.

* 10GBASE-LR and 10GBASE-ER – these standards support 10 km and 40 km respectively over single-mode fiber.

* 10GBASE-SW, 10GBASE-LW and 10GBASE-EW. These varieties use the WAN PHY, designed to interoperate with OC-192 / STM-64 SONET / SDH. They correspond to the physical layer to 10GBASE-SR, 10GBASE-LR and 10GBASE-ER respectively, and hence use the same types of fiber and support the same distances. (There is no WAN PHY standard corresponding to 10GBASE-LX4).

They use peer to peer connection, connecting only two devices. (FUNIVERSA – 2010 – MPE-GO – Computer Technician)
10 gigabit Ethernet is very new, and remains to be seen which standard will gain commercial acceptance.

Related Standards

These networking standards are not part of IEEE 802.3 Ethernet standard, but support the Ethernet frame format, and are able to interoperate with it.

  • Wireless Ethernet (IEEE 802.11) – often running at 2 Mbit / s (802.11legacy), 11 Mbit / s (802.11b) or 54 Mbit / s (802.11g).
  • 100BaseVG – An early contender to the Ethernet 100 Mbit / s. It runs over Category 3 cabling. Uses four pairs. A failure commercially.
  • TIA 100BASE-SX – Promoted by the Telecommunications Industry Association (TIA). 100BASE-SX is an alternative implementation of Ethernet 100 Mbit / s fiber; is incompatible with the official 100BASE-FX. Its main feature is interoperability with 10BASE-FL, supporting auto-negotiation between 10 Mbit / s and 100 Mbit / s, a feature lacking in the official standards due to the use of wavelengths of different LED. It is targeted for use in the installed base of fiber networks to 10 Mbit / s.
  • TIA 1000BASE-TX – Promoted by the Telecommunications Industry Association, was a commercial failure, and no products exist. 1000BASE-TX uses a simpler protocol than the official 1000BASE-T standard, but requires Category 6 cabling.

Study: From Wikipedia, the free encyclopedia. The text is available under the Creative Commons.

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