GPON ndi chiyani?
Tekinoloje ya GPON (Gigabit-Capable PON) ndi m'badwo waposachedwa wa Broadband passive optical Integrated access standard yotengera mulingo wa ITU-TG.984.x. Ili ndi zabwino zambiri monga bandwidth yayikulu, kuchita bwino kwambiri, kuphimba kwakukulu, komanso mawonekedwe ogwiritsira ntchito olemera. Ogwiritsa ntchito ambiri amawona ngati ukadaulo wabwino kwambiri wopezera ma Broadband ndikusintha kwathunthu kwa mautumiki a netiweki.
GPON idaperekedwa koyamba ndi bungwe la FSAN mu September 2002. Pachifukwa ichi, ITU-T inamaliza kupanga ITU-T G.984.1 ndi G.984.2 mu March 2003, ndipo inamaliza G.984.1 ndi G.984.2 mu February ndi June. 2004. 984.3 standardization. Pomaliza adapanga banja lokhazikika la GPON.
Mapangidwe oyambira a zida zozikidwa paukadaulo wa GPON ndi wofanana ndi wa PON yomwe ilipo. Amapangidwanso ndiOLT(optical line terminal) ku ofesi yapakati ndi ONT/ONU(optical network terminal kapena yotchedwa optical network unit) kumbali ya ogwiritsa. ODN (Optical Distribution Network) yopangidwa ndi SM fiber ndi passive splitter (Splitter) ndi dongosolo loyang'anira maukonde.
Pamiyezo ina ya PON, muyezo wa GPON umapereka chiwongolero chapamwamba chomwe sichinachitikepo, chokhala ndi liwiro lotsika mpaka 2.5Gbit/s, ndipo mawonekedwe ake asymmetric amatha kusintha bwino msika wama data a burodibandi. Imapereka chitsimikizo chathunthu cha QoS, ndipo imanyamula ma ATM ndi (kapena) mafelemu a GEM nthawi yomweyo. Ili ndi kuthekera kwabwino kopereka milingo yautumiki, kuthandizira chitsimikizo cha QoS ndi mwayi wopeza ntchito zonse. Mukanyamula mafelemu a GEM, mautumiki a TDM amatha kujambulidwa ku mafelemu a GEM, ndipo mafelemu a 8kHz (125μs) amatha kuthandizira mwachindunji ntchito za TDM. Monga mulingo waukadaulo wapa telecommunication, GPON imatchulanso njira yodzitetezera ndikumaliza ntchito za OAM pamlingo wolumikizira netiweki.
Muyeso wa GPON, mitundu ya mautumiki omwe akufunika kuthandizidwa akuphatikizapo mautumiki a data (mautumiki a Ethernet, kuphatikizapo IP services ndi MPEG kanema mitsinje), ntchito za PSTN (POTS, ISDN services), mizere yodzipereka (T1, E1, DS3, E3, ndi ntchito za ATM). ) Ndi ntchito zamakanema (kanema wa digito). Ntchito zingapo mu GPON zimajambulidwa ku ma cell a ATM kapena mafelemu a GEM otumizira, omwe angapereke zitsimikizo zofananira za QoS zamitundu yosiyanasiyana yautumiki.