Njani ubuchwepheshe Ethernet Fast

Kangangexesha elide desyatimegabitnaya womnatha kuphela kwendlela ukudibanisa iikhompyutha. Nangona le ndlela waba eziliqela iimpawu (plug-terminators, uphawu yokungqubana, ukutshatisa izinto ukuvimba yomtshangatshangiso), kubalulekile kakhulu. Le mishini azibizi ufakelo - elula, kwaye isantya 1.25 MB / s isuti wonke. Nangona kunjalo, umthamo data ezosulela ekubeni ezinkulu qho ngonyaka, kwaye neemfuno network zekhompyutha some. Ngoko ke, kule minyaka 90 ukuya endaweni isigqibo lixesha weza iteknoloji Fast Ethernet. basiwa ingqalelo, "nezifo ebantwaneni" Mbit-10 networks zoyiswe kuphuhliso iminqweno kubasebenzisi kunye nabenzi.

Ethernet Fast. incazelo

Ixesha lokuzalwa 1992 nako kuqwalaselwa kunyaka ubuchwepheshe a. Kungelo xesha ukuba iqela yeenkampani abathatha inxaxheba ekudalweni kwezixhobo networking, kuquka 3Com, SYNOptics kunye nabanye eziliqela udale umbutho okhethekileyo edityanelweyo ebizwa ngokuba "Fast Ethernet Alliance". imisebenzi yayo ziquka uhlalutyo inkqubela abenzi ezahlukeneyo, nenokuthi isetyenziswe ukwenza izisombululo ukudluliselwa data ngesantya esiphezulu. Ngaphezu koko, imigaqo ukusekwa kunye nokusasazwa iipakethi idatha kufuneka kwahluka kakhulu ukusuka uthungelwano megabit-10. Oku kuyimfuneko ukuze kugcinwe wokuhambelana ukufikelela CSMA / CD.

Kulo nyaka kwi IEEE Association neMigangatho kwasekwa, msebenzi lowo ukufunda kwenziwa ziinkampani ze megabit-100 izisombululo ukufikelela. Yaqala phantsi ke into iinkampani kukumelana oyimfihlo kunye nophuhliso zabo. Wonke developer bafuna ukuqinisekisa ukuba isigqibo sakhe yamkelwe umgangatho.

Ngenxa yoko, njengokuba idla kunjalo, abantu abaninzi kwafuneka ukuba idini yi ukusilela. Umzekelo, ecetywayo ubugcisa 100VG-AnyLAN evela HP kunye AT & T, eyenza umgaqo omtsha ngokupheleleyo lokufikelela Demand Priority, saliwe ngenxa yokuba umva-ehambelanayo kunye nezisombululo ezikhoyo 10Base.

Isiphumo umsebenzi kulwamkelo 1995 of megabit-100 isisombululo standard Fast Ethernet, lo 802.3u isiqu.

iimpawu

Umahluko omkhulu phakathi Ethernet olukhawulezayo owayephambi yayo - 10 mbps Base-T - yaba utshintsho ekuphunyezweni ngokwasemzimbeni.

Ngaphandle wokuhambelana isisombululo ophelileyo, okulungileyo kule netheknoloji:

- ukunyusa izinga data ukuya ku 12.5 Mbytes / s (ngokufanayo 100 mbps);

- ukusetyenziswa yofikelelo oluzenzekelayo;

- amathuba ngokusebenzisa izisombululo eqhelekileyo, ngokuba umsebenzi walondoloza ukudala uthungelwano star-emile, kwaye zingasetyenziswa umqhubi classical: isibini ezijijekileyo kunye nefayibha.

Ekubeni kwifomathi iipakethi data abasebenzi olukhawulezayo Ethernet iye yahlala injalo ngaphakathi kwawo, kuyenzeka ukuba kuzuzwe uhambelwano phantse ngokupheleleyo umva. Ngoko ke, nkqu ngoku, zonke izisombululo womnatha ukuya mbps 100 yaye 1 gigabit ukunika 10-mbps imo (zingasetwa ukuba ukunyanzela kwi kumqhubi).

Noko ke, kukho umahluko. Umzekelo, ixesha zothumelo isakhelo amathuba ziye zancitshiswa phantse 10 amaxesha (enyanisweni, unako ukufikelela nodibaniso olunesantya esiphezulu onjalo).

iimpawu esezirekhodiwe

Njengoko Ethernet ukhetho, musa ukusebenzisa intambo yafakwa, 100 mbps Ethernet olukhawulezayo ifuna uqhagamshelwano kuzo zonke iziphelo amasebe balwamkele. Oku kunokuba amakhadi womnatha weekhompyutha, neenafu kunye hub (hub). On umda ubude line akumiselweyo kuxhomekeke kudidi umqhubi. Ngenxa yoko, esi sibini ephinyaphinyelayo yesihlanu udidi umgama avumelekile kweemitha 100, kodwa ikuvumela ukusebenza ifayibha 400 m (kabini nesiqingatha) ukuya km 2.

Nangona inani labo baphindayo (zabaphindayo) nayo umda, oko akuthethi ukukhusela indalo kothungelwano entsonkothileyo yesiphaluka multi-izibuko yezixhobo ezinjalo.