X.25 shine yarjejeniyar sadarwar da aka yi a cikin shekarun 1980
X.25 shi ne tsarin bin ka'idojin da aka yi amfani dashi don sadarwa a kan hanyar sadarwa ta hanyar sadarwa- WAN . Yarjejeniyar wata yarjejeniya ce da aka amince da shi akan ka'idoji da ka'idoji. Na'urorin biyu waɗanda ke bi irin ladabi ɗaya zasu iya fahimtar juna da musayar bayanai.
Tarihin X.25
An kirkiro X.25 a cikin shekarun 1970 don yin murya kan hanyoyin sadarwa na layi na analog ɗin-kuma yana daya daga cikin ayyukan da aka fi sauya mafi sauƙi. Ayyukan al'ada na X.25 sun haɗa da cibiyoyin sadarwa ta atomatik da kuma hanyoyin sadarwar katin bashi. X.25 kuma yana goyan baya ga mahimman lambobin sadarwa da aikace-aikacen uwar garke. A shekarun 1980s sune ne na fasahar X-25 lokacin amfani da hanyar sadarwa ta hanyar sadarwa, Tymnet, Telenet, da sauransu. A cikin farkon 90s, yawancin cibiyoyin X.25 sun maye gurbinsu da Relay Frame in US Wasu tsofaffin cibiyoyin sadarwa a waje da Amurka sun ci gaba da amfani da X.25 har zuwa kwanan nan. Yawancin cibiyoyin da suke buƙatar X.25 yanzu suna amfani da Ƙananan yanar gizo mai ladabi. X-25 har yanzu ana amfani dashi a wasu ATMs da kuma hanyoyin sadarwa na katin bashi.
X-25 Tsarin
Kowane fakitin X.25 ya ƙunshi ƙananan bayanai 128. Cibiyar ta X.25 ta yi amfani da taro ta fakitin saiti a cikin na'ura mai tushe, da aikawa, da kuma shiryawa a wurin. Kasuwancin fasaha na X.25 da aka haɗa ba kawai canzawa da kuma hanyar sadarwa-Layer ba tukuna amma har kuskuren dubawa da retransmission dabaru ya kamata a bayarwa gazawar faruwa. X.25 yana goyan bayan maganganu guda daya ta hanyar ninka kwakwalwa da yin amfani da tashoshin sadarwa ta hanyar sadarwa.
X-25 ya ba da layi guda uku na ladabi:
- Layer jiki
- Jagoran bayanan bayanai
- Layer Layer
X-25 yana ƙaddamar da Model Model Model , amma X-25 layers suna da mahimmanci ga layi na jiki, alamar jigilar bayanai da kuma cibiyar sadarwa na tsarin OSI na yau da kullum.
Tare da karɓar karbar Intanet (IP) a matsayin daidaitattun hanyoyin sadarwar kamfanoni, aikace-aikacen X.25 sun yi gudun hijira zuwa matakan da ba su da rahusa ta yin amfani da IP a matsayin yarjejeniyar Layer cibiyar sadarwa kuma ya maye gurbin ƙananan layin na X.25 tare da Ethernet ko tare da sabon kayan ATM .