Kamis, 28 Agustus 2014

e da umarnin a cikin wani

Alama Ring ne irin wani gida yankin na cibiyar sadarwa (LAN) fasaha farko da tunanin fitar da wani IBM maginin abu, Olof Söderblom, a cikin shekara1960s. Its US kafa dokar kare mallakar aka farko da aka yaba, a 1981, aka daga baya ciyar da IBM a ko'ina cikin farkon 1980s. Sa'an nan kuma, sai aka jama'ar IBM a lõkacin da ta Token Ring gine da aka kafa a kan aiki Multi-tashar access raka'a (MSAUs ko MAUs) da kuma IBM They discussed System. The Institute of Electrical and Electronics Engineers ma daidaita da Token Ring as IEEE 802,5. Ko da yake mai nasara a cikin farkon kwanaki, tare da gabatarwar 10-BASE-T (Ethernet) da kuma EIA / Tia 5638 discussed misali, da shahararsa da kuma sunan fadi by farkon 1990s. IBM yi kokarin raya shi ta hanyar wani tsanani Yekuwar kasuwanci kamar yadda kokarin outdo Ethernet cikin sharuddan yi da aminci, amma bai iya daidaita da mayalwaci saka farashi gasar. A yau, IBM ba na goyon bayan, na inganta, ko yayi amfani da Token Ring.


Brief History
Lokacin da aka gwada a 1985 by IBM, da Token Ring ka ruwaito data at 4 Mb / s kuma ƙarshe kai 16 Mb / s alaƙa a 1989 tare da 802,5 misali ana mika su goyi bayan shi. Apollo Computer outdid IBM, a 1981 lokacin da suka gabatar da Apollo Token Ring (ATR), ta hanyar yada a wata 12 Mb / s gudu da kuma tare da Proteon suka gabatar da ProNet-10 Token Ring a 1984 wanda ya kai 10 Mb / s. Abin mamaki ko da yake, IBM ya ba jituwa da ba na biyu na Token Zobba.


A cikin Technology
Kamar yadda kowa zai iya tsammani, kamar yadda sunan bayar da shawarar, da Token Ring LAN ne a lokacin da tashoshin ke da umarnin a cikin wani zobe topology. A cikin wannan zobe, tashoshin za su aika da data daga wannan zobe tashar zuwa wani da wani iko alama a tsakiyar circulating. To pictorially sa, a Token Ring network ne kamar star, tare da madaukai za a kuma daga tsakiyar tashar ga Dandali a waje. An cabled tare da IBM "Type-1" kare Twisted biyu. Duk da haka, wadannan hermaphroditic haɗin suna ba mafi manufa igiyoyi, kamar yadda suke su ne quite babbar, bukata a 3 x 3 cm sarari, kuma Ya sanya har na hadaddun da m filastik guda.

A Token Ring ne m wani gida yankin cibiyar sadarwa yarjejeniya a cikin data link Layer (DLL) na OSI model. Kamar yadda da sunan da ya nuna, shi yana amfani da abin da aka kira wani alama, a uku-byte frame, wanda revolves a kusa da wani zobe a cikin wani madauki. Tun da kowane tashar maimaita wannan hanya na ta yin amfani da alama da zobe, kuma su da nisa da tushe da maƙwabci, wannan shi ne yadda ake samun kafa daga cikin tashoshin. A tashar zai saya da zama dole alama, sa'an nan kuma aika da shi.

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