Kule mihla, kwiiprojekthi zonxibelelwano lwenethiwekhi yangoku, ii-transceivers ezibonakalayo,iitransceivers zefiber optical, kunye neemodem ezibonakalayo zinokuthi zisetyenziswe ngokubanzi kwaye zihlonishwe kakhulu ngabasebenzi bokhuseleko.Ke, ngaba uyawazi umahluko phakathi kwezi zintathu zicacileyo?
Imodem ye-Optical luhlobo lwezixhobo ezifana ne-baseband MODEM (imodem yedijithali).Umahluko kwi-baseband ye-MODEM kukuba iqhagamshelwe kumgca wefiber optical ozinikeleyo, oyisignali ye-optical.
Isetyenziselwa ukuguqulwa kwesignali ye-photoelectric kunye ne-interface protocol kwinethiwekhi yendawo ebanzi, kwaye i-router yokufikelela kukufikelela kwinethiwekhi yendawo ebanzi.I-transceiver ye-photoelectric isebenzisa ukuguqulwa kwesignali ye-photoelectric kwinethiwekhi yendawo yendawo, kodwa kuphela ukuguqulwa kwesignali, ngaphandle kokuguqulwa kwe-interface protocol.Isetyenziswa ngokubanzi kumgama omde kwinethiwekhi ye-campus kwaye ayifanelekanga kwindawo apho. iintambo ezijijekileyo ziyasetyenziswa.Ukuze ucacise imodem ye-optical, i-transceiver ye-photoelectric.Kufuneka sazise indawo ezisetyenziswa kuyo.
Imodem yokukhanya, eyaziwa ngokuba yi-single-port optical transceiver, yimveliso eyenzelwe indawo ezikhethekileyo zabasebenzisi.Isebenzisa i-fiber optical fibers kwi-E1 enye okanye i-V. 35 enye okanye i-10BaseT enye i-point-to-point optical transmission terminal equipment.Njengesixhobo sokuhambisa i-relay yothungelwano lwendawo, esi sixhobo sifanelekile kwisixhobo sokuhambisa i-fiber optical terminal yesikhululo esisisiseko kunye nezixhobo zomgca oqeshisiweyo.Kwii-multi-port optical transceivers, ngokuqhelekileyo kuthiwa "i-transceivers optical".Kwi-single-port optical transceivers, zisetyenziswa ngokubanzi kwicala lomsebenzisi.Zisebenza ngokufanayo ne-baseband esetyenziswa ngokuqhelekileyo iMODEM ye-WAN ezinikeleyo yonxibelelwano (yesekethe) yothungelwano."Imodem ye-Optical" kunye ne "Optical Network Unit".
Ii-transceivers ze-Optical ziimveliso zonxibelelwano lwedatha kuphela.Iimveliso zangempela ze-transceiver optical ziyahlukahlukana, ziluncedo kuthungelwano lukamabonakude wentambo, ezinye zokusasaza ngomnxeba, ziluncedo kulawulo lwemizi-mveliso, kwaye ezinye zide zidibanise "ilizwi, idatha, umfanekiso" kunye nezinye iinkonzo ukufikelela kuNye.
I-transceiver ye-fiber optical iqonda ukuguqulwa kwesignali phakathi kwe-mode-mode kunye ne-multi-mode fiber kunye ne-twisted pair kwi-Ethernet.I-transceiver ye-fiber optical yiyunithi yokuguqula imidiya ye-Ethernet etshintshisa umgama omfutshane ojijekileyo weempawu zombane kunye neempawu ze-optical ezikude.Ii-transceivers ze-Optical zisetyenziswa ngokubanzi kwiindawo zangempela zenethiwekhi apho iintambo ze-Ethernet azikwazi ukugqunywa kwaye iifiber zamehlo kufuneka zisetyenziswe ukwandisa umgama wokudlulisa;ngelo xesha, bancedisa ukudibanisa i-mile yokugqibela yemigca yefiber optical kuthungelwano lwendawo yemetropolitan (yeteknoloji ye-Ethernet) kunye neengqimba zangaphandle ezingaphezulu.I-Intanethi nayo idlale indima enkulu.
Ngokwesantya, i-transceiver ye-fiber optical inokwahlulwa ibe yi-10M enye, i-100M i-fiber optical transceiver,I-10/100M i-adaptive fiber optical transceiverkunye ne-1000M i-fiber optical transceiver.I-10M kunye ne-100M ii-transceivers zisebenza kwinqanaba lomzimba, kunye neemveliso ze-transceiver ezisebenza kule layer phambili idatha ye-bit by bit.Le ndlela yokuthumela ineenzuzo zesantya sokuthumela ngokukhawuleza, izinga eliphezulu lokungafihli, ukulibaziseka okuphantsi, njl., Kungcono ukuhambelana kunye nokuzinza, kwaye ifanelekile ukusetyenziswa kwiikhonkco eziqingqiweyo.
I-10/100M i-fiber optical transceiver isebenza kwi-data link layer.Kulo maleko, i-transceiver ye-fiber optical isebenzisa indlela yokugcina kunye ne-forward ukuze ifunde idilesi ye-MAC yomthombo wayo, idilesi ye-MAC yokufikela, kunye nedilesi ye-MAC yokufikela kwipakethi nganye efunyenweyo.Idatha, ipakethe yedatha ithunyelwa emva kokuba i-CRC cyclic redundancy check igqityiwe.Okokuqala, inokuthintela ezinye izakhelo ezingalunganga ekusasazekeni kwinethiwekhi kwaye zithathe izixhobo zenethiwekhi ezixabisekileyo.Kwangaxeshanye, inokuthintela ukulahleka kwepakethe yedatha ngenxa yokuxinana kwenethiwekhi.
Ngokwesakhiwo, inokwahlulwa ibe yi-desktop yohlobo lwe-fiber transceiver kunye nohlobo lwe-rack optical fiber transceiver.I-desktop optical fibre transceiver ifanelekile kumsebenzisi omnye, njengokuhlangana ne-uplink yokutshintsha okukodwa kwipaseji.I-Rack-mounted fiber optic transceivers ifanelekile ukuhlanganiswa kwabasebenzisi abaninzi.
Ngokutsho kwefiber, inokwahlulwa ibe yi-multi-mode fiber transceiver kunye ne-fiber-mode-fiber transceiver.Ngenxa yeendlela ezahlukeneyo ze-optical fibers ezisetyenzisiweyo, umgama wokuhanjiswa kwe-transceiver uhlukile.Umgama wothumelo jikelele we-multi-mode transceiver uphakathi kweekhilomitha ezi-2 kunye neekhilomitha ezi-5, ngelixa i-transceiver yemodi enye inokugubungela uluhlu olusuka kwiikhilomitha ezingama-20 ukuya kwi-120 yeekhilomitha.Kufuneka kucaciswe ukuba ngenxa yomahluko kumgama wothumelo, amandla okuhambisa, ukufumana ubuntununtunu kunye ne-wavelength ye-fiber optic transceiver ngokwayo nayo iya kwahluka.Amandla okudlulisa amandla e-5km optical fiber transceiver ngokuqhelekileyo phakathi kwe-20 ukuya kwi-14db, kwaye ukuva ukuva ukuva -30db, usebenzisa i-wavelength ye-1310nm;ngelixa amandla okuhambisa i-120 km optical fiber transceiver ubukhulu becala phakathi kwe-5 ukuya kwi-0dB, kwaye ukuva ukuva ukuva ngu--38dB, usebenzisa i-1550nm wavelength.
Ngokwenani leentsinga zamehlo, inokohlulwa ibe yi-fiber-optical transceiver enye kwayei-transceiver ebonakalayo yefayibha ezimbini.Ifayibha enye kukuqonda ukuba idatha ifumana kwaye ithunyelwa kwifiber ebonakalayo.Olu hlobo lwemveliso lwamkela itekhnoloji yolwahlulo lwe-wavelength multiplexing, kwaye i-wavelengths esetyenziswayo ubukhulu becala yi-1310nm kunye ne-1550nm.Ngenxa yokusetyenziswa kwe-wavelength division multiplexing, iimveliso ze-fiber transceiver enye ngokubanzi zinophawu lokunciphisa umqondiso omkhulu.Okwangoku, uninzi lwe-fiber optic transceivers kwimarike zimveliso ezimbini zefiber, ezikhulileyo kwaye zizinzile.
Ewe, oku ngasentla kukwaziswa malunga nomahluko phakathi kwe-transceiver optical, i-fiber optical transceiver kunye nemodem ebonakalayo.Ndiyathemba ukuba inokuba luncedo kuwe!