Nekuvandudzwa kwekutaurirana, ruzivo runodikanwa kufambiswa harisi izwi chete, asiwo zvinyorwa, data, mifananidzo, uye vhidhiyo.Yakabatana nekuvandudzwa kwekutaurirana kwedhijitari uye tekinoroji yekombuta, mumakore ekuma1970 nema1980, T1 (DS1)/E1 mutakuri masisitimu (1.544/2.048Mbps), X.25 furemu relay, ISDN (Integrated Services Digital Network) uye FDDI ( Optical fiber yakagoverwa data interface) uye mamwe matekinoroji etiweki.Nekuuya kwesangano reruzivo, vanhu vanotarisira kuti nharembozha dzemazuva ano dzekufambisa mashoko dzinogona kupa matunhu akasiyana siyana nemasevhisi nekukurumidza, mune zveupfumi, uye zvinobudirira.Nekudaro, nekuda kweiyo monotonicity yebasa ravo, kuomarara kwekuwedzera, uye kuganhurirwa kwebandwidth, iyo yakataurwa pamusoro apa network tekinoroji inongori mukutanga Kugadziridzwa kana kuvandudzwa mukati megadziriro haichabatsiri.SDHyakagadzirwa pasi pemamiriro ezvinhu aya.Pakati peakasiyana Broadband optical fiber access network tekinoroji, iyo yekuwana network system uchishandisa SDH tekinoroji ndiyo inonyanya kushandiswa.Kuberekwa kweSDH kunogadzirisa dambudziko rekusakwanisa kuenderera mberi nekugadzirwa kwemusana wetiweki uye zvinodiwa zvebasa remushandisi nekuda kwekugadzirisa bandwidth yezvinyorwa zvinopinda mukati, uye dambudziko rekuwana "bottleneck" pakati pemushandisi uye core network. , uye panguva imwe chete, yakawedzera huwandu hukuru hwebhanwidth pane network yekutumira.Utilization rate.Kubva pakaunzwa tekinoroji yeSDH muma1990, yanga iri tekinoroji yakakura uye yakajairika.Inoshandiswa zvakanyanya mumambure network uye mutengo uri kuderera nekudzika.Iko kushandiswa kweSDH tekinoroji mune yekuwana network inogona kudzikisa yakakura bandwidth mune yepakati network.Zvakanakira uye zvehunyanzvi zvakanakira zvinounzwa mumunda wekuwana network, ichishandisa zvizere SDH synchronous multiplexing, yakajairwa optical interfaces, ine simba network manejimendi kugona, flexible network topology kugona uye kuvimbika kwakanyanya kuunza mabhenefiti, uye mabhenefiti enguva refu mukuvaka uye. kuvandudzwa kwekuwana network.