Amaxabiso ethu aya kuba mahle kwaye akhuphisana ngenxa yokuba sikwazi ukuvelisa kakuhle, nangona amaxabiso enokutshintsha ngokuxhomekeke kubonelelo kunye nezinye izinto ezikwimarike. Siza kukuthumelela uluhlu lwamaxabiso oluhlaziyiweyo emva kokuba inkampani yakho inxibelelane nathi ukuze ufumane ulwazi oluthe kratya.
Hayi ngokwenene. Siza kucaphula ngokwenani lakho. Okukhona uodola okuninzi, kokukhona uya kufumana ixabiso elingcono. Kwaye ukuba ufuna iisampulu zasimahla, nceda unxibelelane nathi nge-imeyile.
Ewe, ewe. Singakunika amaxwebhu anxulumene noko, anjengeSatifikethi soHlalutyo/sokuThotyelwa kweMvumelwano; i-Inshorensi; iMvelaphi, kunye namanye amaxwebhu okuthumela ngaphandle.
Ngokwenani lakho kunye nemodeli ngokweenkcukacha, siza kukunika ixesha elifanelekileyo lokufumana imveliso. Njengesiqhelo, kwiisampuli, ixesha lokufumana imveliso limalunga neentsuku ezisi-7. Kwimveliso enkulu, ixesha lokufumana imveliso liphakathi kweentsuku ezingama-20-30 emva kokufumana intlawulo yedipozithi. Sazise simahla ukuba unayo nayiphi na imfuneko ekhethekileyo.
Ungenza intlawulo kwiakhawunti yethu yebhanki, iWestern Union okanye iPayPal:
Idiphozithi ye-30% kwangaphambili, ibhalansi ye-70% xa ithelekiswa nekopi ye-B/L.
Siqinisekisa izixhobo zethu kunye nomsebenzi wethu. Ukuzinikela kwethu kukuqinisekisa ukuba wanelisekile ziimveliso zethu. Nokuba iwaranti injani na, yinkcubeko yenkampani yethu ukujongana nokusombulula zonke iingxaki zabathengi ukuze wonke umntu aneliseke.
Ewe, sisoloko sisebenzisa ukupakisha okusemgangathweni ophezulu kokuthumela ngaphandle. Sikwasebenzisa ukupakisha okuneengozi okukhethekileyo kwiimpahla eziyingozi kunye nabathumeli abaqinisekisiweyo beendawo zokugcina izinto ezibandayo kwizinto ezinobushushu obuphantsi. Iimfuno zokupakisha ezikhethekileyo kunye neemfuno zokupakisha ezingezizo ezisemgangathweni zinokubangela intlawulo eyongezelelweyo.
Iindleko zokuthumela zixhomekeke kwindlela okhetha ukufumana ngayo impahla. I-Express idla ngokuba yeyona ndlela ikhawulezayo kodwa ikwayeyona ibiza kakhulu. Ukuthutha impahla ngolwandle sisisombululo esifanelekileyo xa kukho imali eninzi. Amaxabiso okuthutha impahla singakunika kuphela ukuba siyazi iinkcukacha zobungakanani, ubunzima kunye nendlela. Nceda unxibelelane nathi ukuze ufumane ulwazi oluthe kratya.
Enyanisweni, umahluko phakathi kwe-OM3 kunye ne-OM4 fiber usekwakheni kwentambo ye-fiber optical. Umahluko kulwakhiwo uthetha ukuba intambo ye-OM4 inokunciphisa okungcono kwaye inokusebenza kwi-bandwidth ephezulu kune-OM3. Yintoni isizathu soku? Ukuze ikhonkco le-fiber lisebenze, ukukhanya okuvela kwi-VCSEL transceiver kunamandla aneleyo okufikelela kwi-receiver kwelinye icala. Kukho amaxabiso amabini okusebenza anokuthintela oku—ukunciphisa ukukhanya kunye nokusabalalisa kwe-modal.
Ukuncitshiswa kwamandla esignali yokukhanya njengoko idluliselwa (dB). Ukuncitshiswa kwamandla kubangelwa kukulahlekelwa kukukhanya ngokusebenzisa izinto ezingasebenziyo, ezifana neentambo, ii-cable splices, kunye nezihlanganisi. Njengoko kukhankanyiwe ngasentla, izihlanganisi ziyafana ngoko ke umahluko wokusebenza kwi-OM3 vs OM4 ukwilahleko (dB) kwintambo. Ifayibha ye-OM4 ibangela ilahleko ephantsi ngenxa yokwakhiwa kwayo. Ukuncitshiswa okuphezulu okuvunyelwe yimigangatho kuboniswe ngezantsi. Ungabona ukuba ukusebenzisa i-OM4 kuya kukunika ilahleko ephantsi ngemitha nganye yentambo. Ukulahleka okuphantsi kuthetha ukuba unokuba neekhonkco ezinde okanye ube nezihlanganisi ezininzi ezidibeneyo kwikhonkco.
Ukunciphisa okuphezulu okuvunyelweyo kwi-850nm: OM3<3.5 dB/Km; OM4<3.0 dB/km
Ukukhanya kudluliselwa kwiindlela ezahlukeneyo ecaleni kwefayibha. Ngenxa yokungafezeki kwifayibha, ezi ndlela zifika ngamaxesha ahlukeneyo kancinci. Njengoko lo mahluko usanda ekugqibeleni ufikelela kwinqanaba apho ulwazi oludluliselwayo lungenakukwazi ukucaciswa. Lo mahluko phakathi kweendlela eziphezulu nezisezantsi waziwa ngokuba yi-modal dispersion. I-modal dispersion imisela i-modal bandwidth enokusebenza kuyo ifayibha kwaye lo ngumahluko phakathi kwe-OM3 kunye ne-OM4. Okukhona i-modal dispersion iphantsi, kokukhona i-modal bandwidth iphezulu kwaye kokukhona ulwazi olunokudluliselwa lukhulu. I-modal bandwidth ye-OM3 kunye ne-OM4 iboniswe ngezantsi. I-bandwidth ephezulu ekhoyo kwi-OM4 ithetha i-modal dispersion encinci kwaye ngaloo ndlela ivumela amakhonkco eentambo ukuba abe made okanye ivumela ilahleko eziphezulu ngokusebenzisa izihlanganisi ezidityanisiweyo ngakumbi. Oku kunika ukhetho oluninzi xa ujonga uyilo lwenethiwekhi.
I-Bandwidth yeCable yeFiber encinci kwi-850nm: OM3 2000 MHz·km; OM4 4700 MHz·km
Ungasazisa ngenkathalo malunga neemeko zokusingqongileyo apho ezi mveliso ziza kusetyenziswa khona, unokukhetha iinkcukacha ezineenkcukacha ezifana nokufuma, ubushushu, kunye nezinto zejoloji. Singanikezela ngezinto ezenziwe ngentambo/ifayibha edityanisiweyo kunye namaxabiso ukuhlangabezana neemfuno zakho ezithile. Kukho neenketho zemveliso ezenziwe ngokwezifiso.
Intambo yefayibha iqulathe oku kulandelayo:
I-Core**: Iglasi/i-silica ecocekileyo kakhulu (ububanzi obuyi-8-62.5µm) yokuhambisa ukukhanya.
Isigqubuthelo**: Umaleko wangaphandle onesalathisi esisezantsi sokukhanyela ukuze uqulathe ukukhanya.
Ukwaleka**: Umaleko we-acrylate okhuselayo (250µm).
Amalungu okuqina**: Iintambo ze-Aramid/iintonga ze-fiberglass.
Ijakethi yangaphandle**: Izinto ze-PE/PVC/LSZH zokukhusela okusingqongileyo.
| **Ipharamitha** | **Imo enye (SMF)** | **Imo ezininzi (MMF)** |
|----------------------|- ...
| Ububanzi obuphambili | 8-10µm | 50/62.5µm |
Umgama | 80-120km | ≤550m (OM4) |
| I-bandwidth | Ayinamda (ngokwethiyori) | Inqunyelwe kukusasazwa kwe-modal |
| Ixabiso | Ephezulu (imithombo yelaser) | Ephantsi (i-LED/i-VCSEL) |
| **Sebenzisa Ityala** | I-Telecom/5G backhaul | Amaziko edatha/iKhampasi |
Ubuchwepheshe be-SDM buquka:
Iifayibha ze-Multi-core (MCF)**: Iifayibha eziyi-7-19, eziboniswe njenge-1Pbps transmission.
Iifayibha zemowudi ezimbalwa (FMF)**: Iindlela ezininzi zokukhanya kwisiseko ngasinye.
Inzuzo yomqhubi*: Inciphisa ukuxinana kwemibhobho; i-NTT ifake i-MCF kwi-metro yaseTokyo.
Ezi fibers:
- Khokela ukukhanya emoyeni (hayi kwiglasi), unciphise ukubambezeleka nge-31% (1.46μs/km vs. 2.13μs/km).
- Izicelo ezijoliswe kuzo: i-HFT (urhwebo oluqhelekileyo), iinethiwekhi ze-quantum.
*Umngeni*: Ukunciphisa amandla aphezulu (~3dB/km) xa kuthelekiswa ne-0.17dB/km ye-SMF.
A: Iindawo ezintathu ekugxilwe kuzo:
1. I-Fronthaul**: Sebenzisa iifayibha ze-G.654.E (ukulahleka okuphantsi, indawo enkulu esebenzayo) kwii-wavelengths ezingaphezulu kwe-400G.
2. Iiseli ezincinci**: Iintambo ezincinci (≤6mm ububanzi) zokusetyenziswa kweendawo ezixineneyo zasezidolophini.
3. Ukuhlanganiswa kwe-SDN**: Yenza kube ngokuzenzekelayo ukwabiwa kwezixhobo zefayibha nge-OpenROADM.
A:Iingenelo ziquka:
- Ukunciphisa iindleko ngama-30% ngokusebenzisa uyilo olungenabungqina bomthengisi (umz., iVodafone's Open Fiber Initiative).
- Uhlaziyo olukhawulezileyo (iimodyuli zefayibha ezifakelwayo nezidlalwayo).
A:** Uvavanyo olubalulekileyo:
I-OTDR (i-Optical Time Domain Reflectometer)**: Ilinganisa ukulahleka/ukuqhekeka kwe-splice.
Uvavanyo Lokulahlekelwa Kokufakwa**: Ukuqinisekiswa kokulahleka kwe-dB ukusuka ekuqaleni ukuya ekupheleni.
Uvavanyo lokuSasazwa kweChromatic**: Kubalulekile kwiinkqubo ezihambelanayo ezingaphezulu kwe-100G.
1. **Inyathelo 1**: Fumana impazamo ngaphakathi kwe-3m usebenzisa i-OTDR enesisombululo esiphezulu.
2. **Inyathelo lesi-2**: Sebenzisa izixhobo zokukhasa iifayibha zerobhothi ukuze zilungiswe phantsi komhlaba.
3. **Inyathelo lesi-3**: Sebenzisa ii-fusion splicers ezine-≤0.02dB splice loss.
Iintlobo eziphambili ziquka:
-Ifayibha yemowudi enye (SMF):** Yenzelwe ukudluliselwa komgama omde, i-bandwidth ephezulu (umz., ubude bamaza obuyi-1310/1550nm).
-Ifayibha ye-Multimode (MMF):** Isetyenziselwa umgama omfutshane (umz., i-OM1/OM2/OM3/OM4/OM5 kwi-850/1300nm).
Iintambo zangaphakathi/zangaphandle:** Uyilo olunezixhobo, olungenazixhobo, oluneribhoni, okanye olunemibhobho ekhululekileyo.
-iintambo ezikhethekileyo:** FTTH (iintambo zeDrop), iintambo zasemanzini, iintambo zomoya, njl.njl.
cinga:
- **Umgama:** I-SMF ye >1km; I-MMF ye ≤500m (iyahluka ngokwezinga ledatha).
- **Ixabiso:** Ii-transceivers ze-MMF zibiza kancinci kodwa i-SMF inikezela ngokukhusela kwixesha elizayo.
- **Usetyenziso:** I-SMF ye-telecom/i-long-haul; I-MMF yeendawo zedatha/ii-LAN.
Izikhokelo eziphambili:
- Kuphephe ukudlula **ukutsalwa koxinzelelo** (umz., ≤150N kwi-SMF).
- Gcina ubuncinane **i-radius egobileyo** (umz., i-20mm kwiintambo zokupeyinta).
- Sebenzisa **izihlanganisi/izihlanganisi** ezifanelekileyo (LC/SC/MPO) kwaye ucoce iziphelo ze-ferrule.
- Vavanya nge **OTDR/power meters** emva kokufakelwa.
Ngokwesiqhelo **iminyaka engama-20–25**, kodwa kuxhomekeke koku:
- Izinto ezibangela imeko-bume (ukufuma, ukuvezwa yi-UV).
- Uxinzelelo loomatshini (ukugoba, ukungcangcazela).
- Ukuqhubela phambili kwezobuchwepheshe kunokubangela uphuculo ngaphambi kokuba i-EOL iqale.