I-OLT iyintloko yomsebenzi wemvondo we-Layer 3?

I-Optical Line Terminal, noma i-OLT, yintlango elithandwa kakhulu kumhlaba wombuzo wocota. Amamphetheli, am-OLT zizikhona ngokulandelayo kwindawo yokuthumela idatha yakho emigca lenkululeko. Zisebenzisa ngakumbi kwiisistimu sezifayethu. Leesistimuni zingabhalise ukhetho lwesayithi lokugcina kusebe sasebenzi nge-intanethi elincinci, uzokusetyenziswa ukuze uphumele online icontenti kunye neezicateleni.

Izixhobo ezinamkelo ngazo nge-OLT ziyi: Ngokushesha, zihlaleni ukusetyenziswa komthengwana wo-Voice over IP (VoIP) okusetshenziswa ngabantu ukukhethelela izicall eziyindlela le-intanethi. Izicall ezifayethu zikhona, apha ungabonisa umbuzo wakho nokuba ungene ngaphandle, kunye nokufinyelela ukufika kuhlanganisi kwesayithi kunye nebusiness ngokuphi ndawonye. Kodwa, ngapha ke amathengwana amadaluwe amanani akhetho kwiintlobo ezimbili zeekhompyutha, xa kunjalo amathengwana amadaluwe amanani akhetho kwiintlobo ezimbili zeekhompyutha.

Amanyange amathengwana amadaluwe amanani akhetho kwiintlobo ezimbili

Ngoko ke ukuze siyibona ngaphi sithi ukuthi i-OLT ayikho isimo se-layela 3, kufuneka sifunda okuningi nge-OSI Model. Imodel yesi OSI yilisemva lokusebenzisa njenge-terminology yokuvamileyo ukubheka ngokwesetyenziso lowo difana idilesi le-network ya kompyutha zikhululekile. Izi-7 layela zingasimangalala ukukhumiselela ukuxhumana ngalo magama, ngoba yayingezantsi layelenti ngokwezinto ezizithile.

Elayela langoku elijongisiweyo ngu-physical layer. Layelo usebenzisa ukuthi udlale amabite ezingqina ngaphandle kwezicabango esebenzisa amacabhedzelo. Layela lesibini ngingu-data link layer. Layelo luhlola ukuthi umngeni wamandla wabo babekhethwe ukufika kwisekhono sesinye. Ngakwesonto, sihlaba kwi-layela lesithathu, elinganiswa ngu-network layer. Ukugcina kufanele kuleso layela. Ukugcina kukho ukususa kwisekhono esinye, futhi amandla akugcinwa ngokuba zinikwe imigomo ye-layela 3.

I-OLT ingasebenzisa ukuthatha amandla apho kukho ukuthi udli amandla phakathi kwesinye olt fiber iinkqubo kodwa aluhlola amalendlela angqaleka. Izixhobo zabo zikhuthaza ukufuneka kuhluke iinkqubo zesiye ngaphandle kwezinto ezinikezayo, njengomsebenzi wemvume we-router okanye icomputer. Izixhobo zakho zihluke izinto eziphathelene nazo zokuba ziziphindaphindi ukuba idatha isetyenziswa phakathi kwezinye izindlela.

Izandiso Eziphathelene Zokugcina Kwi-Layer 3 Ukulula

Ukulula, ngokubanzi nokuphambili kwisixa lokuhlola nokuthetha amalendelela amahlongo esebenza lona ukuba amadatagram ayithumele phakathi kwenkqubo. Ukulula kuluhlola ngamaxesha we-3 ixhobo elisebenza ngokulula amarules amakhulu amaziveleyo kunye neziBGP. I-Border Gateway Protocol (BGP) kunye ne-IS-IS (Intermediate System to Intermediate System)

Amarules amanze ukuthi usebenze ukususa idatha ngokungaphezulu kunye nokungabuyiselwa ont modems umendo. Zingena izinto zomdlalo nokuthi kuvimbeni kweendaweni, umendo wokulayisha amandla, kunye nokulayisheka okukhethwe ngaphandle kokuthi ukuhlala kwenze imali. Ngokugcina, i-OLTs aziqondisi ukuthi bayahlala ukubuyeleya ipakethi yedatha emuva kwindawo yokugcino, kodwa abaningi amaxwebhu angazange azikhethwe ukuba zakhiwe ukuthi zifundise ukuphatha. Yintoni, i-OLTs ziziphathe njenge-ndawo ezidingekayo, yinto engeziqondisi ukuthi zifundise ukuphatha komdalo wesintshontolo, ngoko ukuthi zifundise uprosesu kodwa aziphathelani ngenkathi zikhetha ukuthi data zikhulume ngaphambili.

Ukubona Ukusebenza kwe-OLT

Ukungaba i-OLTs zizibini nezinye iindlela zezimali, phakathi konke kuhlelwa ngalokho? I-OLTs zinakwenzeka ngaphakathi kwesayithi esebenzisa indawo yesityathelo. Umsebenzi omphumela wabo kukuthi bakhuluma edatha ngokuyenza ukufaka amandla ngokushesha kwiindawo eziphakamisayo. Ungabhekisele ukuthi i-OLTs zibe ngokwemanzelo; zikhubaza edatha ngokuzihlanganiswa ngokushesha kunye no-WDM.

Ukuxhasa okanye ukugqibela i-signal esetyeni (WDM) yintyalo engaxhaselwa ngenqanawe yokuthi inxalenye yesayithi siyinqanawe, okanye imibala, ezityeni. Umsebenzisi wesandla olunye ulahleka idatha ngokwesayithi esebenzayo. Oku kuvumela amaqhawekazi abini nokuthi akufanele ahlale ngaphandle kokubhalisana ngeenye. Ngokulungile, i-OLT zingakwazi ukufumana imisebenzi eziphathelwayo. Ziqhenya, isiqhele, idatha, lokuthi uzame ukususa kweendaba, okanye uzama ukudibana nesicwangciso sokusebenza (QoS) ukuze usebenze leenkulumano enye yeesayithi ye-Internet.

I-Truth ye-OLT — Lapho Akwenziwa Kwiilayenti zeNetworking?

Ngoku, i-OLT zizikhanketho ezidingekileyo kwezinto zophandle lokuhlola industrial switch isiqephesi. Ngokubhebunye kakhulu, zisebenzisa ukuthi bafinyelele amaxesha edatha endaweni yokugcina. Kuningi ukubhekisisa ukuba i-OLTs ayikho amandla zakwezi 3 ngoba azisebenzela izicatshululo ezintathu. Ngokugcineneyo, i-OLTs aziqaphelile ukubeka izicatshululo, kodwa ngakwesobizo sonye sosebenzelo sokuxhasa esiphakeme sesiqephesi. Bayodibana ngephakamiso langokuqinisekisa phakathi komoya wesithunzi wesethembinkosi nokumaxwebhu osebenza abasebenzela. Siyazi ngangoko inkazini yezinto eziphathelayo i-OLTs kwisixhumanisi esisodwa sisikhathi sokusebenzela kwiThink Tides. Ngisho emva kokucabanga lokusebenza, apho sifuna ukufaka le nto olusha kunye nezimali ezindaweni ezidingekayo ukusetyenziswa kwegama lakho.