I-X.25 yayiyi-suite yeprotocol ye-protocol ekhethiweyo kuma-1980
I-X.25 yayisisigxina esilandelayo seprotocol esetyenziselwa ukuhanjiswa kwepakethi-switched network-wide WAN . Umgaqo-nkqubo uyisethi yemigaqo nemigaqo. Izixhobo ezimbini ezilandela iinkqubo ezifanayo ziyakwazi ukuqonda kunye nokutshintsha idatha.
Imbali ye X.25
I-X.25 yaveliswa ngee-1970 ukuqhuba ilizwi phezu kwemizila yocingo ye-analog - intanethi- up -kunye nenye yeenkonzo ezindala kakhulu zokupakisha ipakethe. Izicelo eziqhelekileyo ze-X.25 zazibandakanya amanethiwekhi omatshini oomatshini ozenzekelayo kunye namanethiwekhi okuqinisekiswa kwekhadi lokuthenga ngetyala. I-X.25 nayo ixhase iintlobo ezahlukeneyo zokugcina izixhobo kunye nesicelo sevava. I-1980 yayiyi-teydays ye-teknoloji ye-X-25 xa isetyenziselwa iinqununu zedatha yoluntu iCompuserve , iTymnet, iTenenet nabanye. Kwiminyaka yokuqala ye-90, amaninzi ama-X.25 amanethiwekhi athatyathwa yi- Frame Relay e-US Amanye amanethiwekhi amaninzi asekudala ngaphandle kwe-US aqhubeka nokusebenzisa i-X.25 kude kube kutshanje. Uninzi amanethiwekhi amaninzi afunayo i-X.25 ngoku isebenzisa iProtokholi ye-intanethi engqongqo. I-X-25 isasetyenziselwa kwezinye iATM kunye namanethiwekhi okuqinisekiswa kwekhadi lokuthenga ngetyala.
Uhlobo lwe-X-25
Iipakethi nganye ze-X.25 ziquke kwii-128 zeedatha. I-X.25 inethiwekhi ithathe idilesi yepakethi kwisixhobo sokubakho, ukuhanjiswa, kunye nokubuyiswa kwakhona kwindawo ekuya kuyo. I-X.25 iteknoloji yokuhanjiswa kweepakethe ayifakwanga kuphela ukutshintshela kunye neendlela zokucwangcisa inethiwekhi kodwa kunye nephutha ukuhlola nokubuyiswa kwelo logic kufuneka ukuba ukungaphumeleli kokunikezelwa kwenzeke. I-X.25 ixhasana ngeengxoxo ezininzi ngokuxeshanye ngee-multiplexing iipakethi kunye nokusebenzisa iziteshi zokunxibelelana.
I-X-25 inikezelwa ngamacandelo amathathu esiseko:
- Uluhlu lwesimo
- Uluhlu lwekhonkco lweenkcukacha
- Umgca wePakethi
I-X-25 ilandelelanisa i- OSI Reference Model , kodwa i-X-25 izalathisi zifana nomgca wendawo, uluhlu lwekhonkco lwedatha kunye nocingo lwenethiwekhi yomzekelo oqhelekileyo we- OSI .
Ngenxa yokwamukelwa kwe- Intanethi ye- intanethi (IP) njengomgangatho wemigangatho yenkampani, izicelo ze-X.25 zihanjiswe kwisisombululo esincinci zisebenzisa i-IP njengendlela yokucwangciswa kwenethiwekhi kunye nokubeka endaweni ephantsi kwe-X.25 nge- Ethernet okanye nge-hardware entsha ye- ATM .