Kedu ihe bụ GPON?
Teknụzụ GPON (Gigabit-Capable PON) bụ ọgbọ ọhụrụ nke ọkọlọtọ brọdband passive optical integrated access standard dabere na ọkọlọtọ ITU-TG.984.x.Ọ nwere ọtụtụ uru dị ka bandwit dị elu, arụmọrụ dị elu, mkpuchi buru ibu, njirimara onye ọrụ bara ụba, wdg Ọtụtụ ndị na-arụ ọrụ na-ewere ya dị ka nkà na ụzụ dị mma maka ịmepụta brọdband na mgbanwe mgbanwe nke ọrụ netwọk ịnweta.
Òtù FSAN bu ụzọ wepụta GPON na Septemba 2002. Dabere na nke a, ITU-T mezuru mmepe ITU-T G.984.1 na G.984.2 na Maachị 2003 ma mechaa G. na February na June 2004. Standardization of 984.3 .N'ihi ya, a na-emecha guzobe ezinụlọ ọkọlọtọ nke GPON.
Ntọala ntọala nke ngwaọrụ dabere na teknụzụ GPON yiri nke PON dị.Ọ bụkwa OLT (optical line terminal) nke etiti ụlọ ọrụ, ONT / ONU nke njedebe onye ọrụ (ọnụahịa netwọk anya ma ọ bụ ngwa netwọk anya), na ngwaọrụ abụọ mbụ jikọtara site na otu ọnọdụ.The Optical fiber (SM fiber) na passive splitter (Splitter) bụ nke ODN (Optical Distribution Network) na usoro njikwa netwọkụ mejupụtara.
Maka ụkpụrụ PON ndị ọzọ, ọkọlọtọ GPON na-enye bandwidth dị elu nke na-enwetụbeghị ụdị ya na ọnụego mgbada ruru 2.5 Gbit/s, yana njirimara asymmetric ya dabara adaba maka ahịa ọrụ data brọdband. Ọ na-enye nkwa ọrụ zuru oke nke QoS, ma na-ebu mkpụrụ ndụ ATM. na/ma ọ bụ okpokolo agba GEM.Ọ nwere ọkwa ọrụ dị mma, nkwa QoS na ohere ọrụ zuru oke.Mgbe ị na-ebu okpokolo agba GEM, enwere ike ịdepụta ọrụ TDM n'ime okpokolo agba GEM, yana okpokolo agba 8 kHz (125 μs) nwere ike kwado ọrụ TDM ozugbo.Dị ka ọkọlọtọ teknuzu klaasị ụgbọelu, GPON na-akọwapụtakwa usoro nchebe yana ọrụ OAM zuru ezu na ọkwa netwọk ohere.
N'ụkpụrụ GPON, a kọwapụtara ụdị ọrụ a chọrọ nkwado nke ọma: ọrụ data (ọrụ Ethernet, gụnyere ọrụ IP na iyi vidiyo MPEG), ọrụ PSTN (POTS, ọrụ ISDN), na ahịrị raara onwe ya nye (T1, E1, DS3, E3, na ọrụ ATM).) na ọrụ vidiyo (vidiyo dijitalụ).A na-edepụta ọtụtụ ọrụ dị na GPON na sel ATM ma ọ bụ okpokolo agba GEM maka nnyefe, na-enye nkwa QoS kwekọrọ maka ụdị ọrụ dị iche iche.