I-Network Integrated Services Network (ISDN) ubuchwepheshe benethiwekhi obusekela ukudluliswa kwedatha kwezwi kanye ne-traffic traffic ngesikhathi esifanayo kanye nokusekelwa kwevidiyo nefeksi. I-ISDN yathola ukuthandwa emhlabeni jikelele phakathi neminyaka yama-1990 kodwa ikakhulukazi isetshenziselwa ubuchwepheshe obuningi bokuxhumana nobude besikhathi eside.
Umlando we-ISDN
Njengoba izinkampani zethungiselwano zishintsha kancane kancane ingqalasizinda yefoni yazo kusukela ku-analog kuya kudijithali, ukuxhuma ezindaweni zokuhlala kanye namabhizinisi ngamanye (okubizwa ngokuthi "inethiwekhi yokugcina imitha") kwahlala kumazinga endala wokukhombisa kanye netambo yethusi. I-ISDN yenzelwe njengendlela yokudlulisela lobu buchwepheshe ku-digital. Amabhizinisi atholakala kakhulu ku-ISDN ngenxa yenani elikhulu lamafoni edesksi nemishini yefeksi amanethiwekhi awo adingekayo ekusekeleni ngokuthembeka.
Ukusebenzisa i-ISDN ye-Inthanethi ukufinyelela
Abantu abaningi baqala ukuthola i-ISDN njengenye indlela yokufinyeleleka kwe-intanethi ye -dial-up . Nakuba izindleko zesevisi ye-intanethi ye-ISDN yokuhlala ephakeme kakhulu, abanye abathengi bazimisele ukukhokha ngaphezulu kwenkonzo ekhangisa kuze kube ngu-128 Kbps ngesivinini sokuxhuma kufana nokuvinjelwa kwe-56 Kbps (noma okuhamba kancane) kokudayela.
Ukubhekezela ku-intanethi ye-ISDN kudinga i- modem yedijithali esikhundleni se- modem yokudayiswa yendabuko, kanye nenkontileka yesevisi nomhlinzeki wesevisi we-ISDN. Ekugcineni, isivinini esikhulu se-network esisekelwa ubuchwepheshe obusha be- intanethi ye-intanethi njenge- DSL yakhipha amakhasimende amaningi kude ne-ISDN.
Nakuba abantu abambalwa baqhubeka bewasebenzisa ezindaweni ezingaphansi kwezindawo lapho izinketho ezingcono zingatholakali, abahlinzeki abaningi be-intanethi baqede ukusekela kwabo nge-ISDN.
I-Technology Behind ISDN
I-ISDN isebenzisa imigqa ejwayelekile yocingo noma imigqa ye- T1 (imigqa ye-E1 kwamanye amazwe); ayisekeli ukuxhumana okungenantambo). Izindlela zokuguqula ezijwayelekile ezisetshenziselwa amanethiwekhi we-ISDN zivela ensimini yezokuxhumana, kuhlanganise no-Q.931 ukusetha ukuxhumeka no-Q.921 ukuthola ukuxhumana.
Izinguquko ezimbili eziyinhloko ze-ISDN zikhona:
- Isixazululo sezinga eliyisisekelo (i-BRI-ISDN) : Ifomu le-ISDN ukuthi abathengi bayakubona njengendlela yokufinyeleleka kwe-inthanethi, i-BR isebenza ngemigqa yocingo yocingo yethusi njalo isekela amazinga we-128 Kbps kokubili kokulayishwa nokulandwa. Iziteshi ezimbili ze-64 Kbps ezibizwa ngokuthi iziteshi zokuphatha (ezibizwa nangokuthi i-DS-0 izixhumanisi zokuxhumana) zithwala idatha ngenkathi umzila we-16 Kbps ulawula ulwazi lokulawula. Abanikezeli be-Telecom ngezinye izikhathi bayabiza le nsizakalo ye- ISDN2 ebhekisela kokusethwa kwesiteshi kwedatha ezimbili.
- Isixazululo sokulinganisa okuyisisekelo (PRI-ISDN) : Le fomu ephakeme kakhulu ye-ISDN isekela ukuhamba okugcwele kwe-T1 ka-1.544 Mbps (futhi kufika ku-2.048 Mbps ku-E1). Ku-T1, i-PRI isebenzisa iziteshi ezingu-23 ezifanayo eziphethe ithrekhi engu-64 Kbps, uma kuqhathaniswa neziteshi ezimbili ezinjalo ze-BRI. EYurophu nase-Asia, abahlinzeki bavame ukubiza le nsizakalo ye- ISDN30 njengoba imigqa ye-E1 esetshenziswa kulawo mazwe asekela iziteshi ezingu-30 eziphethe.
Ifomu lesithathu le-ISDN elibizwa nge- Broadband (B-ISDN) nalo lichazwe. Ifomu eliphambili kakhulu le-ISDN laklanyelwe ukuba lifinyelele kuma-Mbps amakhulu, ligijime ngamakhodi e-fiber optic futhi isebenzise i- ATM njengendlela yobuchwepheshe bayo bokushintsha. I-ISDN ye-broadband ayifinyelelanga ukusetshenziswa okujwayelekile.