Classic Ethernet
Classic Ethernet is a family of 10 Mbit/s Ethernet standards, which is the first generation of Ethernet standards. In 10BASE-X, the 10 represents its maximum throughput of 10 Mbit/s, BASE indicates its use of baseband transmission, and X indicates the type of medium used. Classic Ethernet includes coax, twisted pair and optical variants. The first Ethernet standard was published in 1983 and classic Ethernet operating at 10 Mbit/s was the dominant form of Ethernet until the first standard for Fast Ethernet was approved in 1995.[1]
Varieties
[edit]| Name | Standard | Status | Media | Connector | Transceiver Module | Reach in m | # Media (⇆) | # Lambdas (→) | # Lanes (→) | Notes |
|---|---|---|---|---|---|---|---|---|---|---|
| Classic coaxial Ethernet - (Data rate: 10 Mbit/s - Line code: PE - Line rate: 20 MBd - Full-Duplex / Half-Duplex) | ||||||||||
| 10BASE5 Thick Ethernet DIX Standard | 802.3-1983 (CL8) | obsolete 09/2003 | Coax RG-8X (50 Ω) | AUI, N, Vampire tap | MAU | 500 | 1 | N/A | 1 | LAN; original standard; electrical bus topology with collision detection; uses a single coaxial cable into which you literally tap a connection by drilling into the cable to connect to the core and screen. |
| 10BASE2 Thin Ethernet ThinNet Cheapernet | 802.3a-1988 (CL10) | obsolete 09/2011 | Coax RG-58 (50 Ω) | BNC, EAD/TAE-E | 185 | 1 | N/A | 1 | LAN; dominant standard from the mid to late 1980s; electrical bus topology with collision detection; coaxial cable connects machines together, each machine using a T-connector to connect to its NIC. Requires terminators at each end. | |
| Classic fibre Ethernet - (Data rate: 10 Mbit/s - Line code: PE - Line rate: 20 MBd - Full-Duplex / Half-Duplex) | ||||||||||
| FOIRL | 802.3d-1987 (CL9.9) | superseded | Fibre 850 nm | ST | MAU | OF: 1k | 2 | 1 | 1 | original standard for Ethernet over fiber; uses any optical fiber with up to 4 dB/km attenuation and at least 150 MHz bandwidth; superseded by 10BASE-FL |
| 10BASE-FL | 802.3j-1993 (CL15/18) | largely obsolete | Fibre 850 nm | ST | FDDI: 2k | 2 | 1 | 1 | Nodes | |
| 10BASE-FB | 802.3j-1993 (CL15/17) | largely obsolete | Fibre 850 nm | ST | FDDI: 2k | 2 | 1 | 1 | synchronous inter-repeater connections | |
| 10BASE-FP | 802.3j-1993 (CL15/16) | obsolete | Fibre 850 nm | ST | FDDI: 1k | 2 | 1 | 1 | passive, repeaterless star network; Market Failure, never implemented | |
Fibre-based standards (10BASE-F)
[edit]10BASE-F, or sometimes 10BASE-FX, is a generic term for the family of 10 Mbit/s Ethernet standards using fiber-optic cable. In 10BASE-F, the 10 represents a maximum throughput of 10 Mbit/s, BASE indicates its use of baseband transmission, and F indicates that it relies on a medium of fiber-optic cable. The technical standard requires two strands of 62.5/125 μm multimode fiber. One strand is used for data transmission while the other is used for reception, making 10BASE-F a full-duplex technology. There are three different variants of 10BASE-F: 10BASE-FL, 10BASE-FB and 10BASE-FP. Of these only 10BASE-FL experienced widespread use.[2] With the introduction of later standards 10 Mbit/s technology has been largely replaced by faster Fast Ethernet, Gigabit Ethernet and 100 Gigabit Ethernet standards.
FOIRL
[edit]Fiber-optic inter-repeater link (FOIRL) is a specification of Ethernet over optical fiber. It was specially designed as a back-to-back transport between repeater hubs to decrease latency and collision detection time, thus increasing the possible network radius. It was replaced by 10BASE-FL.[2]
10BASE-FL
[edit]10BASE-FL is the most commonly used 10BASE-F specification of Ethernet over optical fiber. In 10BASE-FL, FL stands for fiber optic link. It replaces the original fiber-optic inter-repeater link (FOIRL) specification, but retains compatibility with FOIRL-based equipment. When mixed with FOIRL equipment, the maximum segment length is limited to FOIRL's 1000 meters.[2]
10BASE-FB
[edit]The 10BASE-FB is a network segment used to bridge Ethernet hubs. Here FB abbreviates FiberBackbone. Due to the synchronous operation of 10BASE-FB, delays normally associated with Ethernet repeaters are reduced, thus allowing segment distances to be extended without compromising the collision detection mechanism. The maximum allowable segment length for 10BASE-FB is 2000 meters. This media system allowed multiple half-duplex Ethernet signal repeaters to be linked in series, exceeding the limit on the total number of repeaters that could be used in a given 10 Mbit/s Ethernet system. 10BASE-FB links were attached to synchronous signaling repeater hubs and used to link the hubs together in a half-duplex repeated backbone system that could span longer distances.[2]
10BASE-FP
[edit]In 10BASE-FP, FP denotes fibre passive. This variant calls for a non-powered optical signal coupler capable of linking up to 33 devices, with each segment being up to 500 m in length. This formed a star network centered on the signal coupler. A LAN implementing this standard was applied as a branch LAN to construct an all-optical fiber hierarchical integrated LAN with a high-speed LAN (FDDI, etc.) as the backbone.[2][3]
See also
[edit]References
[edit]- ^ "IEEE Standards for Local and Metropolitan Area Networks: Supplement - Media Access Control (MAC) Parameters, Physical Layer, Medium Attachment Units, and Repeater for 100 Mb/s Operation, Type 100BASE-T (Clauses 21-30)". IEEE Standards Association. Retrieved 2023-06-04.
- ^ a b c d e Charles E. Spurgeon (2014). Ethernet: The Definitive Guide (2nd ed.). O'Reilly Media. ISBN 978-1-4493-6184-6.
- ^ Parker, Tim (2000-07-10). "Obscure standard may make you flip for fibre". ProQuest Computer Science Journals. 13 (11). Rogers Publishing Limited. ProQuest 274984076.
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