“Classic Ethernet”的意思、由来-开放百科全书

词条

Classic Ethernet

释义

Varieties
10BASE-F
10BASE-FL 10BASE-FB FOIRL 10BASE-FP
References

Classic Ethernet is a generic term for the 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.

Varieties

Name	Standard	Status	Media	OFC or RFC	Transceiver Module	Reach (km)	# Media	Lanes (⇅)	Notes
Classic Ethernet - (Data rate: 10 Mbit/s - Line code: PE - Line rate: 20 MBd - Full-Duplex / Half-Duplex)}}
{{nowrap>Thick Ethernet}} DIX Standard	802.3-1983}} (CL8)	obsolete 09/2003}}	Coax RG-8X (50 Ω)}}	AUI, N, Vampire tap}}	MAU	0.5	1	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.
{{nowrap>Thin Ethernet}} ThinNet Cheapernet	802.3a-1988}} (CL10)	obsolete 09/2011}}	Coax RG-58 (50 Ω)}}	BNC, EAD/TAE-E}}		0.185	1	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.
10BASE-T}}	0.1	2	1
FOIRL	802.3d-1987 (CL9.9)}}	superseded}}	Fibre {{fontcolour\|red\|850 nm}}}}	ST}}		OF: 1}}	2	1	original standard for Ethernet over fiber; uses any optical fiber with up to 4 dB/km attenuation and at least 150 MHz bandwidth; superseded by 10BASE-FL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 {{fontcolour\|red\|850 nm}}}}	ST}}		{{nowrap\|FDDI: 2}}	2	1	Nodes
10BASE-FB}}	802.3j-1993}} (CL15/17)	largely obsolete}}	Fibre {{fontcolour\|red\|850 nm}}}}	ST}}		{{nowrap\|FDDI: 2}}	2	1	synchronous inter-repeater connections
10BASE-FP}}	802.3j-1993}} (CL15/16)	obsolete}}	Fibre {{fontcolour\|red\|850 nm}}}}	ST}}		{{nowrap\|FDDI: 1}}	2	1	passive, repeaterless star network; {{fontcolour\|red\|Market Failure, never implemented}}}}

10BASE-F

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 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 a three different variants of 10BASE-F: 10BASE-FL, 10BASE-FB and 10BASE-FP. Of these only 10BASE-FL experienced widespread use.^[1] With the introduction later standards 10 Mbit/s technology has been largely replaced by faster Fast Ethernet, Gigabit Ethernet and 100 Gigabit Ethernet standards.

10BASE-FL

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, maximum segment length is limited to FOIRL's 1000 meters.^[1]

10BASE-FB

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.^[1]

FOIRL

Fiber-optic inter-repeater link (FOIRL) is a specification of Ethernet over optical fiber. It was especially designed as a back-to-back transport between repeater hubs as to decrease latency and collision detection time, thus increasing the possible network radius. It was replaced by 10BASE-FL.^[1]

10BASE-FP

In 10BASE-FP, FP denotes Fibre Passive. This variant calls for a non-powered signal coupler to act as optical signal couplers capable of linking up to 33 devices, with each segment being up to 500 m in length. This formed a star-type network centered on the signal coupler. There are no devices known to have implemented this standard.^[1]^[2]

References

1. ^¹²³⁴{{cite book |title=Ethernet: The Definitive Guide |edition=2nd |author=Charles E. Spurgeon |publisher=O'Reilly Media |year=2014 |isbn=978-1-4493-6184-6}}
2. ^{{cite journal |last1=Parker |first1=Tim |title=Obscure standard may make you flip for fibre |journal=ProQuest Computer Science Journals |volume=13 |issue=11 |url=http://search.proquest.com/docview/274984076 |date=2000-07-10 |accessdate=2016-02-28 |publisher=Rogers Publishing Limited}}

1 : Ethernet standards

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