Uyini Umehluko: OM3 vs OM4?
Eqinisweni, umehluko phakathi kwe-OM3 vs OM4 fiber usekwakhiweni kwentambo ye-fiber optic.Umehluko ekwakhiweni kusho ukuthi ikhebula le-OM4 linokunciphisa okungcono futhi lingasebenza kumkhawulokudonsa ophezulu kune-OM3.Siyini isizathu salokhu?Ukuze isixhumanisi sefayibha sisebenze, ukukhanya okuvela kusidluliseli se-VCSEL kunamandla anele okufinyelela kumamukeli ngakolunye uhlangothi.Kunamanani amabili okusebenza angavimbela lokhu—ukuncipha kokubona kanye nokuhlakazeka kwe-modal.
I-Attenuation ukunciphisa amandla esignali yokukhanya njengoba idluliswa (dB).Ukunciphisa kubangelwa ukulahlekelwa ekukhanyeni ngezingxenye ze-passive, njengezintambo, izinsimbi zekhebula, nezixhumi.Njengoba kushiwo ngenhla izixhumi ziyafana ngakho umehluko wokusebenza ku-OM3 vs OM4 usekulahlekeni (dB) kukhebula.I-OM4 fiber idala ukulahlekelwa okuncane ngenxa yokwakhiwa kwayo.Ukuncishiswa okuphezulu okuvunyelwe izindinganiso kuboniswe ngezansi.Ungabona ukuthi ukusebenzisa i-OM4 kuzokunika ukulahlekelwa okuphansi imitha ngayinye yekhebula.Ukulahlekelwa okuphansi kusho ukuthi ungaba nezixhumanisi ezinde noma ube nezixhumi ezixhumene kakhulu kusixhumanisi.
Ukunciphisa okuphezulu okuvunyelwe ku-850nm: OM3 <3.5 dB/Km;I-OM4 <3.0 dB/Km
Ukukhanya kudluliselwa ngezindlela ezahlukene eduze kwefayibha.Ngenxa yokungapheleli ku-fiber, lezi zindlela zifika njengezikhathi ezihluke kancane.Njengoba lo mehluko ukhula ugcina ufinyelele lapho ulwazi oludluliswayo lungakwazi ukuqoshwa.Lo mehluko phakathi kwezindlela eziphakeme neziphansi kakhulu waziwa ngokuthi i-modal dispersion.Ukuhlakazwa kwe-modal kunquma umkhawulokudonsa we-modal ifayibha engasebenza kuwo futhi lona umehluko phakathi kwe-OM3 ne-OM4.Ukuncipha kokuhlakazeka kwe-modal, kuyanda umkhawulokudonsa we-modal kanye nenani elikhulu lolwazi olungadluliswa.I-modal bandwidth ye-OM3 ne-OM4 ikhonjisiwe ngezansi.Umkhawulokudonsa ophezulu otholakala ku-OM4 usho ukuhlakazeka kwemodi encane futhi ngaleyo ndlela uvumela izixhumanisi zekhebula ukuthi zibe zinde noma zivumele ukulahlekelwa okuphezulu ngezixhumi ezixhumene kakhulu.Lokhu kunikeza izinketho eziningi uma ubheka ukwakheka kwenethiwekhi.
I-Minimum Fiber Cable Bandwidth ku-850nm: OM3 2000 MHz·km;OM4 4700 MHz·km
Khetha i-OM3 noma i-OM4?
Njengoba ukuncishiswa kwe-OM4 kungaphansi kune-OM3 fibre futhi umkhawulokudonsa we-modal we-OM4 uphakeme kune-OM3, ibanga lokudlulisela le-OM4 lide kune-OM3.
| Uhlobo lweFiber | 100BASE-FX | 1000BASE-SX | I-10GBASE-SR | 40GBASE-SR4 | 100GBASE-SR4 |
| OM3 | 2000 Amamitha | 550 Amamitha | 300 Amamitha | 100 Amamitha | 100 Amamitha |
| OM4 | 2000 Amamitha | 550 Amamitha | 400 Amamitha | 150 Amamitha | 150 Amamitha |
Isikhathi sokuthumela: Sep-03-2021