Tare da haɓaka sadarwa, bayanan da ake buƙata don watsawa ba murya kawai ba ne, har ma da rubutu, bayanai, hotuna, da bidiyo.Haɗe tare da haɓaka fasahar sadarwar dijital da fasahar kwamfuta, a cikin 1970s da 1980s, T1 (DS1) / E1 tsarin jigilar kaya (1.544 / 2.048Mbps), X.25 frame relay, ISDN (Integrated Services Digital Network) da FDDI (Fiber Optical). bayanan da aka rarraba) da sauran fasahohin hanyar sadarwa.Tare da zuwan jama'ar bayanai, mutane suna fatan cewa hanyoyin watsa bayanai na zamani za su iya samar da da'irori da ayyuka daban-daban cikin sauri, ta fuskar tattalin arziki, da kuma yadda ya kamata.Koyaya, saboda kasancewar ayyukansu guda ɗaya, ƙayyadaddun haɓakawa, da iyakancewar bandwidth, fasahar hanyar sadarwa da aka ambata a sama suna cikin ainihin gyare-gyare ko haɓakawa a cikin tsarin ba su da taimako.SDHan inganta shi a ƙarƙashin wannan yanayin.Daga cikin fasahohin hanyoyin sadarwa na hanyoyin sadarwa na fiber na gani daban-daban, tsarin hanyar sadarwa ta hanyar amfani da fasahar SDH ita ce aka fi amfani da ita.Haihuwar SDH ta warware matsalar rashin iya ci gaba da ci gaba da ci gaban cibiyar sadarwa na baya da kuma bukatun sabis na mai amfani saboda iyakancewar bandwidth na kafofin watsa labaru na inbound, da kuma matsalar samun damar "bottleneck" tsakanin mai amfani da cibiyar sadarwa mai mahimmanci. , kuma a lokaci guda, ya ƙara yawan adadin bandwidth akan hanyar sadarwar watsawa.Yawan amfani.Tun da aka ƙaddamar da fasahar SDH a ​​cikin 1990s, ya kasance fasaha mai girma da kuma daidaitaccen fasaha.Ana amfani dashi sosai a cikin hanyoyin sadarwar kashin baya kuma farashin yana raguwa da ƙasa.Aikace-aikacen fasaha na SDH a ​​cikin hanyar sadarwa na iya rage girman bandwidth a cikin cibiyar sadarwar.Ana kawo fa'idodi da fa'idodin fasaha a cikin fagen samun damar cibiyoyin sadarwa, yin cikakken amfani da SDH synchronous multiplexing, daidaitattun musaya na gani, ikon sarrafa cibiyar sadarwa mai ƙarfi, ƙarfin topology na cibiyar sadarwa mai sauƙi da babban dogaro don kawo fa'idodi, da fa'idodin dogon lokaci a cikin ginin ci gaban hanyoyin sadarwa .