Amanethiwekhi Ethempulethi Ye-Token Awubuchwepheshe be-LAN
Ethuthukiswe yi-IBM phakathi nama-1980 njengenye indlela e- Ethernet , iThokheni Ring iyinhlangano yokuxhumana kwedatha yokuxhumana yamanethiwekhi wendawo (LANs) lapho amadivaysi axhunyiwe kwenkanyezi noma nge-topology ye-ring. Isebenza emgqeni wesi-2 we- OSI model .
Kusukela ngawo-1990, i-Token Ring yancipha kakhulu ekuthandeni futhi kancane kancane isuswa kwamanethiwekhi ebhizinisi njengoba ubuchwepheshe be-Ethernet baqala ukubusa imiklamo ye-LAN.
I-Standard Token Ring isekela kuphela ku-16 Mbps kuphela . Ngawo-1990, isenzo semboni esibizwa ngokuthi i- High Speed Token Ring (HSTR) sathuthukile ubuchwepheshe bokukhulisa i-Token Ring kuya ku-100 Mbps ukuncintisana ne-Ethernet, kodwa isithakazelo esanele emakethe sasikhona kumikhiqizo ye-HSTR nobuchwepheshe buyekelwa.
Indlela Ring Yokwesiphayini Isebenza Ngayo
Ngokungafani nazo zonke ezinye izinhlobo ezijwayelekile zezingxenyana ze-LAN, i-Token Ring igcina eyodwa noma ngaphezulu ozimele idatha ezijwayelekile ezihamba ngokuqhubekayo ngenethiwekhi.
Lezi ozimele zikwabelana ngamadivayisi axhunyiwe kunethiwekhi njengalokhu:
- Uhlaka ( iphakethe ) lufika kudivayisi elandelayo ekulandeleni kwezingoma.
- Leyo divayisi ihlola ukuthi ngabe ifreyimu iqukethe umyalezo okubhekiswe kuyo. Uma kunjalo, idivayisi isusa umlayezo kusuka kuhlaka. Uma kungenjalo, ifreyimu ayinalutho (ebizwa ifreyimu yohwebo ).
- Idivayisi ephethe ifreyimu inquma ukuthi ingabe ithumela umlayezo. Uma kunjalo, kufaka idatha yomlayezo kuhlaka lwesikhombisi bese uyiphakamisa ku-LAN. Uma kungenjalo, idivayisi idedula ifreyimu yesikhombisi kudivayisi elandelayo ngokulandelana ukuze iqoke.
Ngamanye amazwi, ngomzamo wokunciphisa ukuhlanganiswa kwenethiwekhi, idivayisi eyodwa kuphela isetshenziswa ngesikhathi. Izinyathelo ezingenhla ziphindaphindiwe ngokuqhubekayo kuwo onke amadivaysi kwindandatho yeshokheni.
Amatsheni amathrekhi amathathu anesimiso sokuqala nesokugcina esichaza ukuqala nokuphela kwesakhiwo (okusho ukuthi bawubheke imingcele yefreyimu). Futhi ngaphakathi kwethokheni yi-byte yokulawula ukufinyelela. Ubude obude besabelo sedatha ngu-4500 bytes.
Indlela Ring Yokwesiphayili Iqhathanisa Ne-Ethernet
Ngokungafani nenethiwekhi ye-Ethernet, amadivayisi ngaphakathi kwenethiwekhi ye-Token Ring angaba nekheli elifanayo le-MAC ngaphandle kokubangela izinkinga.
Nazi umehluko ohlukile:
- Ukukhonjwa kwamanethiwekhi we-Token Ring kuyabiza ngaphezu kwe-CAT 3 / 5e ye-Ethernet. Futhi amanani amaningi kunamakhadi enethiwekhi yeToken Ring namachweba.
- Amanethiwekhi we-Token Ring angalungiswa lapho ama-node athile angaba khona kuqala kunabanye, into engavunyelwe nge-Ethernet engenakulinganiswa.
- Njengokukhulunywe ngenhla, amanethiwekhi we-Token Ring asebenzisa amathokheni ukuze ugweme ukungqubuzana, kuyilapho amanethiwekhi e-Ethernet (ikakhulukazi lapho ama-hubs asetshenziselwa) ajwayelekile. Yingakho amanethiwekhi e-Ethernet asebenzisa ukushintsha.