Integrated Services Digital Network (ISDN) inyanzvi yehutaneti inotsigira kudhindwa kwedhizha kwezwi pamwe chete nedhidziro rwemashoko pamwe chete nekutsigirwa kwevhidhiyo ne fax. ISDN yakave yakakurumbira munyika yose muma1990 asi yakanyanya kuendeswa mberi nemichina yakareba yakakura yekutengesa mitambo.
The History of ISDN
Sezvo makambani ekufambisa terevhizheni akachinja zvinyorwa zvavo kubva kuAnalogog kusvika kuDhijitori, kuwirirana kune imwe nzvimbo dzekugara uye mabhizinesi (anonzi "makiromita ekupedzisira" network) yakaramba ichinyanya kuratidza maitiro nematare emhangura. ISDN yakagadzirirwa senzira yekuendesa teknolojia iyi kune digital. Mabhizimisi akawanikwa zvakakosha muSDN nekuda kwemafaira makuru emafereksi nemichina yefeksi mitambo yavo inoda kutsigira zvakasimba.
Kushandisa ISDN yeInternet Access
Vanhu vazhinji vakatanga kusvika pakuziva nezveSDN seimwe nzira yekutamba kwepaIndaneti kuwanikwa. Kunyange zvazvo mutengo wekugara kweIndaneti yeIndaneti yepamusoro yakange yakakwirira, vamwe vatengi vaida kubhadhara zvimwe zvebasa rakaparidzirwa kusvika 128 Kbps kufambidzana kwepamusoro maererano ne 56 Kbps (kana kuti inononoka) kukurumidza kuvhara.
Kutarisana neIndaneti yeIndaneti yaida digital modem panzvimbo yekodha-dial-up modem, kusanganisira kambani yebasa neIndaneti. Pakupedzisira, iyo yakakwirira yakanyanya mitambo yakatsigirwa neukwe itsva yebandaneti yeInternet Broadband sezvakaitwa DSL yakaita kuti vatengi vese vaende kure neSDN.
Kunyange zvazvo vanhu vashomanana vachiri kuramba vachichishandisa munzvimbo dzisingasviki dzevanhu pane zvisarudzo zviri nani zvisingasviki, vazhinji vanopa Indaneti vakapedza rubatsiro rwavo kune ISDN.
Iko Technology kuburikidza neSDN
ISNN inoenderera mberi pamusoro pematarenda eunowirirana kana t1 miganhu yeT1 (E1 inowanikwa kune dzimwe nyika); haiti kutsigira wireless connections). Nzira dzinoshandiswa pakugadzirisa nzira dzinoshandiswa pamasetere eIndaneti dzinobva mumunda wekutengesa, kusanganisira Q.931 yekugadzirisa kusangana uye Q.921 yekubatanidza kwekubatana.
Kusiyana kukuru kweSDN kune:
- Mutengo Wakawandisa Wokuwedzera (BRI-ISDN) : Maitiro eSDN ayo vatengi vanoona seInternet access option, BRI inoshanda pamusoro pemigero yefoni yenguva dzose uye inotsigira nhamba yematare ye 128 Kbps yezvose zviri kubudiswa nekutorwa. Mamwe ma 64 Kbps nheyo dze data dzinonzi midziyo yevatakuri (inonziwo DS-0 mazano mumiterevhizheni) inotakura data apo shanyi ye16 Kbps inotarisira mashoko ekudzora. Telecom vanopa dzimwe nguva vanodanawo basa iri ISDN2 rinotaura nezvekugadzirisa dhizinesi mbiri.
- Purogiramu Yepamusoro Pfupi (PRI-ISDN) : Iyi fomu yakakurumidza yeSDN inobatsira T1 yakazara T1 1.544 Mbps (uye kusvika 2.048 Mbps paE1). Pamusoro peT1, PRI inoshandisa 23 mimwe miviri yevatakuri nzira dzese dzinotakura 64 Kbps dzemugwagwa, zvichienzaniswa nemigwagwa 2 yakadaro yeBriti. MuEurope neAsia, vateresi vanowanzoidza basa iri ISDN30 semitsara E1 inoshandiswa munyika idzodzo inotsigira nharaunda 30 yevatakuri.
Nzira yechitatu yeSDN inonzi Broadband (B-ISDN) yakatsanangurwa zvakare. Iyi fomu yakakwirira zvikuru yeSDN yakagadzirirwa kukwira kusvika kumazana eMbps, inomhanya pamusoro pefiber optic cables uye kushandisa ATM sekushandura kwayo teknolojia. Broadband ISDN haina kumbobvira yashandiswa kushandiswa.