Site na mmepe nke nzikọrịta ozi, ozi achọrọ ka ebufe abụghị naanị olu, kamakwa ederede, data, onyonyo, na vidiyo.Ejikọtara ya na mmepe nke nkwurịta okwu dijitalụ na nkà na ụzụ kọmputa, na 1970s na 1980s, T1 (DS1) / E1 ụgbọelu usoro (1.544 / 2.048Mbps), X.25 frame relay, ISDN (Integrated Services Digital Network) na FDDI (Fiber Optical). kesara data interface) na teknụzụ netwọkụ ndị ọzọ.Site na ọbịbịa nke ọha ozi, ndị mmadụ na-atụ anya na netwọk mgbasa ozi nke oge a nwere ike ịnye sekit na ọrụ dị iche iche ngwa ngwa, n'ụzọ akụ na ụba na nke ọma.Otú ọ dị, n'ihi monotonicity nke ọrụ ha, mgbagwoju anya nke mgbasawanye, na njedebe nke bandwit, nkà na ụzụ netwọk ndị a kpọtụrụ aha n'elu bụ naanị na Mgbanwe mbụ ma ọ bụ nkwalite n'ime usoro ahụ anaghịzi enye aka.SDHe mepụtara n'okpuru ndabere a.N'ime teknụzụ netwọọdụ netwọọdụ ikuku ikuku dị iche iche, sistemụ netwọkụ nweta site na iji teknụzụ SDH bụ nke a na-ejikarị.Ọmụmụ SDH na-edozi nsogbu nke enweghị ike ịnọgide na-enwe ọganihu nke netwọk azụ azụ na ihe ndị ọrụ ọrụ chọrọ n'ihi njedebe bandwit nke mgbasa ozi inbound, na nsogbu nke ịnweta "bottleneck" n'etiti onye ọrụ na netwọk bụ isi. , ma n'otu oge ahụ, ọ na-abawanye ụba nke bandwidth na netwọk mgbasa ozi.Ọnụego ojiji.Kemgbe mmalite nke teknụzụ SDH na 1990, ọ bụ teknụzụ tozuru oke na ọkọlọtọ.A na-ejikarị ya eme ihe na netwọk azụ azụ na ọnụ ahịa na-agbada na ala.Ngwa nke teknụzụ SDH na netwọk ohere nwere ike belata nnukwu bandwidth na netwọk isi.Uru na teknuzu uru na-webata n'ime ubi nke ohere netwọk, na-eme n'ụzọ zuru ezu ojiji nke SDH synchronous multiplexing, ọkọlọtọ ngwa anya interfaces, ike netwọk management ike, mgbanwe netwọk topology ike na elu pụrụ ịdabere na-eweta uru, na ogologo oge uru na-ewu na mmepe nke netwọk ohere .