He aha ka ʻokoʻa: OM3 vs OM4?
ʻO ka ʻoiaʻiʻo, ʻo ka ʻokoʻa ma waena o OM3 vs OM4 fiber aia wale nō i ke kūkulu ʻana i ke kaula fiber optic.ʻO ka ʻokoʻa o ke kūkulu ʻana, ʻoi aku ka maikaʻi o ke kaula OM4 a hiki ke hana i ka bandwidth kiʻekiʻe ma mua o OM3.He aha ke kumu o kēia?No ka hoʻohana ʻana i kahi loulou fiber, ua lawa ka mana o ke kukui mai ka transceiver VCSEL e hiki ai i ka mea hoʻokipa ma kēlā ʻaoʻao.ʻElua mau waiwai hoʻokō e hiki ke pale i kēia—optic attenuation a me modal dispersion.
ʻO ka attenuation ka hōʻemi ʻana i ka mana o ka hōʻailona māmā e like me ka lawe ʻia ʻana (dB).Hoʻokumu ʻia ka attenuation ma muli o ka nalowale ʻana o ka mālamalama ma o nā ʻāpana passive, e like me nā uwea, nā ʻāpana kelepona, a me nā mea hoʻohui.E like me ka mea i ʻōlelo ʻia ma luna, ua like nā mea hoʻohui no laila ʻo ka ʻokoʻa o ka hana ma OM3 vs OM4 aia i ka poho (dB) i ke kaula.ʻO ka fiber OM4 ke kumu o nā poho haʻahaʻa ma muli o kāna hana ʻana.Hōʻike ʻia ma lalo nei ka attenuation kiʻekiʻe i ʻae ʻia e nā maʻamau.Hiki iā ʻoe ke ʻike i ka hoʻohana ʻana iā OM4 e hāʻawi iā ʻoe i nā poho haʻahaʻa i kēlā me kēia mika o ke kaula.ʻO nā poho haʻahaʻa, hiki iā ʻoe ke loaʻa nā loulou lōʻihi a i ʻole nā mea hoʻohui i hoʻopaʻa ʻia ma ka loulou.
ʻAe ʻia ka attenuation kiʻekiʻe ma 850nm: OM3 <3.5 dB/Km;OM4 <3.0 dB/Km
Hoʻouna ʻia ka mālamalama ma nā ʻano ʻano like ʻole me ka fiber.Ma muli o nā hemahema o ka fiber, hiki mai kēia mau ʻano i nā manawa ʻokoʻa.Ke piʻi nei kēia ʻokoʻa, hiki ʻoe i kahi i hiki ʻole ke hoʻololi ʻia ka ʻike e hoʻouna ʻia.ʻO kēia ʻokoʻa ma waena o nā ʻano kiʻekiʻe a me nā ʻano haʻahaʻa i ʻike ʻia ʻo ka dispersion modal.Hoʻoholo ka dispersion modal i ka bandwidth modal e hiki ke hana i ka fiber a ʻo ia ka ʻokoʻa ma waena o OM3 a me OM4.ʻO ka haʻahaʻa o ka dispersion modal, ʻoi aku ka kiʻekiʻe o ka bandwidth modal a ʻoi aku ka nui o ka ʻike i hiki ke hoʻouna ʻia.Hōʻike ʻia ka bandwidth modal o OM3 a me OM4 ma lalo nei.ʻO ka bandwidth kiʻekiʻe i loaʻa i ka OM4, ʻo ia ka hoʻopuehu ʻana o ka modal liʻiliʻi a no laila e hiki ai i nā loulou uwea ke lōʻihi a i ʻole e ʻae i nā poho kiʻekiʻe ma o nā mea hoʻohui hou aku.Hāʻawi kēia i nā koho hou aʻe i ka nānā ʻana i ka hoʻolālā pūnaewele.
ʻO ka liʻiliʻi loa o ka fiber Cable Bandwidth ma 850nm: OM3 2000 MHz·km;OM4 4700 MHz·km
E koho iā OM3 a i ʻole OM4?
No ka mea ʻoi aku ka haʻahaʻa o ka attenuation o OM4 ma mua o ka fiber OM3 a ʻoi aku ka kiʻekiʻe o ka bandwidth modal o OM4 ma mua o OM3, ʻoi aku ka lōʻihi o ka lawe ʻana o OM4 ma mua o OM3.
| ʻAno Uila | 100BASE-FX | 1000BASE-SX | 10GBASE-SR | 40GBASE-SR4 | 100GBASE-SR4 |
| OM3 | 2000 mika | 550 mika | 300 mika | 100 mika | 100 mika |
| OM4 | 2000 mika | 550 mika | 400 mika | 150 mika | 150 mika |
Ka manawa hoʻouna: Sep-03-2021