Yadda ya yi da Fast Ethernet fasahar

Na dogon lokaci desyatimegabitnaya cibiyar sadarwa ne kadai hanya zuwa connect da kwakwalwa. Ko da yake wannan dabara da wani yawan siffofin (toshe-terminators, siginar karo, matching da kalaman impedance), shi ne mafi prevalent. A kayan aiki aka gwada da m shigarwa - sauki, da kuma gudun 1.25 MB / s kwat da wando kowa da kowa. Duk da haka, da girma na data ruwaito daga samun girma a kowace shekara, da kuma cibiyar sadarwa hardware da bukatun tsaurara. Saboda haka, a cikin shekaru 90 ya maye gurbin m yanke shawara ya je Fast Ethernet fasaha. aka ɗauke shi zuwa lissafi, "da cututtukan yara" 10-Mbit networks an shawo kan a ci gaba da buri na masu amfani da kuma masana'antun.

Fast Ethernet. description

A lokacin haihuwar 1992 za a iya daukan wani fasahar shekara. A sa'an nan wata ƙungiya daga kamfanonin tsunduma a cikin halittar Networking kayan aiki, ciki har da 3Com, SYNOptics wasu da dama kuma Mun halitta na musamman hadin gwiwa ƙungiya da ake kira "Fast Ethernet Alliance". Its ayyuka sun hada da bincike na da aukuwa na daban-daban masana'antun, wanda za a iya amfani da su haifar da wani high-gudun watsa bayanai mafita. Bugu da ƙari, da ka'idodin samuwar da kuma watsa bayanai fakitoci kada ta kasance ma daban-daban daga cikin 10-megabit networks. Wannan ya zama dole domin ya kula da karfinsu da damar CSMA / CD.

A cikin wannan shekara a cikin IEEE Standards Association aka kafa, wanda aiki ya yi nazarin miƙa ta da kamfanoni na 100-megabit damar mafita. Haka abin ya fara a gefen adawa da kamfanonin da su aukuwa. Kowane developer nema ya tabbatar da cewa shi ne ya yanke shawara da aka soma a matsayin misali.

A sakamakon haka, kamar yadda shi ne sau da yawa haka al'amarin, mutane da yawa da ake yanka ta jayayya. Alal misali, samarwa 100VG-AnyLAN fasahar daga HP da AT & T, wanda aiwatar da wani sabon gaba daya manufa na samun bukatar fifiko, da aka ƙi, domin shi ne ba da baya da baya-jituwa tare data kasance mafita 10Base.

A sakamakon aikin da aka fitarwa a 1995 na 100-megabit bayani Fast Ethernet misali, nadi 802.3u.

Features

Babban bambancin dake tsakanin Fast Ethernet daga da wanda ya riga - 10 Mbps Base-T - wani canji a cikin jiki aiwatar.

Bayan da karfinsu da baya da bayani, babban abũbuwan amfãni daga wannan fasahar ne:

- kara data kudi har zuwa 12.5 Mbytes / s (guda 100 Mbps).

- yin amfani da bazuwar damar.

- da yiwuwar ake ji al'ada mafita, saboda kiyaye aiki don ƙirƙirar wani star-dimbin yawa cibiyar sadarwa, da kuma za a iya amfani da na gargajiya shugaba: Twisted biyu da zare.

Tun da format na Fast Ethernet data fakitoci ma'aikatan ya zauna a cikin wannan, shi ne zai yiwu a cimma kusan cikakkiyar baya karfinsu. Saboda haka, har ma a yanzu, duk cibiyar sadarwa mafita ga 100 Mbps kuma ko da 1 gigabit samar da 10-Mbps yanayin (da shi za a iya kafa tilasta a cikin direba).

Duk da haka, akwai bambance-bambance. Alal misali, frame watsa lokaci jinkiri an rage by kusan sau 10 (a gaskiya, yana yiwuwa a cimma irin wannan babban gudun).

Features segments

Kamar yadda Ethernet zaɓi, ba su yi amfani coaxial na USB, 100 Mbps Fast Ethernet bukatar dangane da duk iyakar da rassan karba. Wannan na iya zama cibiyar sadarwa katunan na kwakwalwa, Dandali da kuma cibiya (Hub). On line tsawon iyakancewa aka aza dangane da irin shugaba. Saboda haka, Twisted biyu na biyar category canja nesa ne mita 100, amma damar aiki fiber 400 m (rabin Duplex) to 2 km.

Ko da yake yawan repeaters (repeater) kuma iyakance, shi bai hana halittar hadaddun cibiyoyin sadarwa na Multi-tashar jiragen ruwa kewaye da irin wannan na'urorin.