Okokuqala, kufuneka siqonde iiparamitha ezahlukeneyo zeiimodyuli zamehlo, apho kukho iintlobo ezintathu eziphambili (i-wavelength ephakathi, umgama wokudluliselwa, izinga lokudluliselwa), kunye nokwahlukana okuphambili phakathi kweemodyuli ze-optical nazo zibonakaliswa kula manqaku.
1.Ubude obuphakathi
Iyunithi yobude bombindi yinanometer (nm), okwangoku kukho iindidi ezintathu eziphambili:
1) 850nm (MM,iindlela ezininzi, ixabiso eliphantsi kodwa umgama omfutshane wothumelo, ngokubanzi kuphela i-500m yosasazo);
2) 1310nm (SM, imodi enye, ilahleko enkulu kodwa i-dispersion encinci ngexesha lokudluliselwa, ngokuqhelekileyo isetyenziselwa ukuhanjiswa ngaphakathi kwe-40km);
I-3) I-1550nm (i-SM, i-mode eyodwa, ilahleko ephantsi kodwa i-dispersion enkulu ngexesha lokudluliselwa, ngokuqhelekileyo isetyenziselwa ukuhanjiswa kwexesha elide ngaphezu kwe-40km, kwaye ikude kakhulu inokudluliselwa ngokuthe ngqo ngaphandle kwe-relay 120km).
2. Umgama wothumelo
Umgama wothumelo ubhekisa kumgama apho imiqondiso ye-optical inokuhanjiswa ngokuthe ngqo ngaphandle kokukhulisa i-relay. Iyunithi ziikhilomitha (ekwabizwa ngokuba ziikhilomitha, iikhilomitha). Iimodyuli ze-Optical ngokubanzi zineenkcukacha ezilandelayo: i-multi-mode 550m, i-mode eyodwa-15km, i-40km, i-80km kunye ne-120km, njl. Linda.
3.Izinga losulelo
Izinga lothumelo libhekiselele kwinani leebhithi (iibhithi) zedatha ethunyelwa ngesekhondi, kwi-bps. Izinga lokudluliselwa liphantsi njenge-100M kwaye liphezulu njenge-100Gbps. Kukho amazinga amane asetyenziswa ngokuqhelekileyo: 155Mbps, 1.25Gbps, 2.5Gbps kunye ne-10Gbps. Izinga losulelo ngokuqhelekileyo lihle. Ukongezelela, kukho iintlobo ze-3 zesantya se-2Gbps, i-4Gbps kunye ne-8Gbps yeemodyuli ze-optical kwiinkqubo zokugcina optical (SAN).
Emva kokuqonda ezi parameters ezintathu zemodyuli yokubona, ngaba unayo ingqiqo yokuqala yemodyuli yokubona? Ukuba ufuna ukuqonda ngakumbi, masijonge ezinye iiparameters zemodyuli yokubona!
I-1.Ukulahleka kunye nokusabalalisa: Zombini zichaphazela kakhulu umgama wokuhanjiswa kwemodyuli ye-optical. Ngokuqhelekileyo, ilahleko yekhonkco ibalwa kwi-0.35dBm / km ye-1310nm imodyuli ye-optical, kwaye ukulahlekelwa kwekhonkco kubalwa kwi-0.20dBm / km ye-1550nm imodyuli ye-optical, kwaye ixabiso lokusabalalisa libalwe liyinkimbinkimbi kakhulu, ngokuqhelekileyo libhekisela kuphela;
I-2.I-Loss kunye ne-chromatic dispersion: Ezi zimbini iiparameters zisetyenziselwa ukuchaza umgama wokuhanjiswa kwemveliso, ukukhutshwa kwe-optical emission yeemodyuli ze-optical kunye ne-wavelengths eyahlukeneyo, amazinga okuhambisa kunye nemigama yokudlulisa Amandla kunye nokufumana ukuqonda kuya kuhluka;
3.Udidi lweLaser: Okwangoku, ezona lasers zisetyenziswa kakhulu yiFP kunye neDFB. Izixhobo ze-semiconductor kunye nesakhiwo se-resonator yezi zibini zihluke. Iilaser zeDFB zibiza kakhulu kwaye zisetyenziswa ikakhulu kwiimodyuli zamehlo ezinemigama yothumelo engaphezulu kwe-40km; ngelixa ii-laser ze-FP zitshiphu, Ngokuqhelekileyo zisetyenziselwa iimodyuli ze-optical kunye nomgama wokudluliselwa ongaphantsi kwe-40km.
4. I-fiber interface ye-Optical: Iimodyuli ze-SFP optical zizo zonke i-LC interfaces, iimodyuli ze-GBIC optical zizo zonke i-SC interfaces, kunye nezinye i-interfaces ziquka i-FC kunye ne-ST;
5. Ubomi benkonzo yemodyuli ye-optical: umgangatho ofanayo wamazwe ngamazwe, iiyure ze-7 × 24 zomsebenzi ongaphazamisekiyo kwiiyure ezingama-50,000 (ezilingana neminyaka emi-5);
6. Okusingqongileyo: Ubushushu bokusebenza: 0~+70℃; Ubushushu bokugcina: -45 ~ + 80 ℃; Umbane osebenzayo: 3.3V; Inqanaba lokusebenza: TTL.
Ke ngokusekwe kwintshayelelo engentla kwiiparamitha zemodyuli ye-optical, masiqonde umahluko phakathi kwemodyuli ye-SFP ye-optical kunye ne-SFP + imodyuli yokukhanya.
1.Inkcazo ye-SFP
I-SFP (i-pluggable form-factor encinci) ithetha i-form-factor pluggable encinci. Yimodyuli eplaggable enokuxhasa i-Gigabit Ethernet, i-SONET, i-Fiber Channel kunye neminye imigangatho yonxibelelwano kunye neplagi kwi-port ye-SFPtshintsha. Inkcazo ye-SFP isekelwe kwi-IEEE802.3 kunye ne-SFF-8472, enokuxhasa ukukhawuleza ukuya kwi-4.25 Gbps. Ngenxa yobukhulu bayo obuncinci, i-SFP ithatha indawo ye-Gigabit Interface Converter (GBIC) eqhelekileyo, ngoko ikwabizwa ngokuba yi-mini GBIC SFP. NgokukhethaIimodyuli ze-SFPngamaza ahlukeneyo kunye namazibuko, izibuko zombane ezifanayo kwitshintshainokudityaniswa kwizihlanganisi ezahlukeneyo kunye neefiber optical of wavelengths ezahlukeneyo.
2.Inkcazo ye-SFP +
Ngenxa yokuba i-SFP ixhasa kuphela izinga losulelo lwe-4.25 Gbps, elingenako ukuhlangabezana neemfuno ezikhulayo zabantu kwizantya zenethiwekhi, i-SFP + yazalwa phantsi kwale mvelaphi. Owona mlinganiselo uphezulu wothumelo lweSFP+inokufikelela kwi-16 Gbps. Ngapha koko, i-SFP+ yinguqulelo ephuculweyo ye-SFP. Inkcazo ye-SFP + isekwe kwi-SFF-8431. Kwiinkqubo ezininzi namhlanje, iimodyuli ze-SFP + zihlala zixhasa i-8 Gbit / s Fiber Channel.Imodyuli ye-SFP + ithathe indawo yeemodyuli ze-XENPAK kunye ne-XFP ezazisetyenziswa ngokuqhelekileyo ekuqaleni kwe-10 Gigabit Ethernet ngenxa yobukhulu bayo obuncinci kunye nokusetyenziswa kakuhle, kwaye iye yaba yimodyuli. eyona modyuli idumileyo ye-optical kwi-10 Gigabit Ethernet.
Emva kokuhlalutya inkcazo engentla ye-SFP kunye ne-SFP +, kunokugqitywa ukuba umehluko omkhulu phakathi kwe-SFP kunye ne-SFP + yizinga lokudluliselwa. Kwaye ngenxa yamaxabiso ahlukeneyo edatha, izicelo kunye nemigama yothumelo nayo yahlukile.