Ohlelweni lokuxhumana lwe-digital division multiplexing zokuxhumana, ukuze kuhlukaniswe kahle amasiginali wesikhathi, isiphetho sokuthumela kufanele sinikeze uphawu lokuqala lohlaka ngalunye, futhi inqubo yokuthola nokuthola lolu phawu ekugcineni ibizwa ngokuthi ukuvumelanisa ifreyimu.Kunezinhlobo ezimbili zokuvumelanisa ifreyimu: indlela yokuvumelanisa yokuqala-stop bese ufaka indlela yeqembu lekhodi yokuvumelanisa ekhethekile.
Indlela yokuvumelanisa yokuqala-ukumisa:Iqembu lekhodi ngokwalo linolwazi lwalo lokuqoqa ngokusebenzisa isimiso sekhodi ekhethekile yombhalo wekhodi ekugcineni kokuthumela.
Ukufaka indlela yeqembu lekhodi yokuvumelanisa ekhethekile:Kubhekiselwa ekufakeni amakhodi amaningana okuvumelanisa ohlaka lokuvumelanisa ngokulandelana kwezimpawu ezidlulisiwe.
Ikakhulukazi kunezinhlobo ezimbili zokufakwa endaweni eyodwa kanye nokufaka isikhawu. Ukufakwa endaweni eyodwa, okwaziwa nangokuthi ukufakwa okuhambisanayo, kudinga ukuthi ibhulokhi ekhethekile yokuvumelanisa uzimele ibe nezici ezinhle kakhulu zokuhlanganisa okuzenzakalelayo. Iqembu lekhodi yokuvumelanisa yozimele elivame ukusetshenziswa yikhodi ye-Barker. Ukufakwa kwesikhawu. Okwaziwa nangokuthi ukufakwa okusabalalisa, ukulandelana kwe-periodic cyclic elula kuvame ukusetshenziswa njengekhodi yokuvumelanisa yozimele, futhi kufakwa ngokufanayo ekusakazeni ikhodi yolwazi.
Isizathu sokuthi kungani isendlalelo sesixhumanisi sedatha sihlanganisa izingcezu zibe ozimele futhi sizidlulisele ukuthi uma kwenzeka iphutha, uhlaka olunamaphutha kuphela olungadluliswa kabusha, futhi akudingekile ukuthi kudluliselwe kabusha yonke idatha, ngaleyo ndlela kuthuthukiswe ukusebenza kahle. Amasheke ngokuvamile abalwa kuhlaka ngalunye. Uma uhlaka lufika endaweni, i-checksum iyabalwa futhi, futhi uma ihlukile kune-checksum yoqobo, iphutha lingatholwa.
Okungenhla incazelo yolwazi "ye-OSI-Data Link Layer-Frame Synchronization Function" elethwa i-Shenzhen HDV photoelectric Technology Co., Ltd. Imikhiqizo yokuxhumana ekhiqizwe ikhava yenkampani:
Izigaba zamamojula: amamojula we-fiber optical, Amamojula we-Ethernet, amamojula we-fiber optical transceiver, amamojula okufinyelela kwefiber optical, Amamojula we-SSFP optical, futhiImicu ye-Optical SFP, njll.
I-ONUisigaba: EPON ONU, AC ONU, i-fiber optical ONU, I-CATV ONU, I-GPON ONU, XPON ONU, njll.
OLTikilasi: Ukushintsha kwe-OLT, I-GPON OLT, I-EPON OLT, ukuxhumanaOLT, njll.
Imikhiqizo yemojula engenhla ingahlinzeka ngosekelo lwezimo zenethiwekhi ezahlukahlukene. Ithimba le-R&D elichwepheshile neliqinile lingasiza amakhasimende anezinkinga zobuchwepheshe, futhi ithimba lebhizinisi elicabangayo nelichwepheshile lingasiza amakhasimende ukuthi athole amasevisi ekhwalithi ephezulu ngesikhathi sokubonisana kwangaphambilini nomsebenzi wangemuva kokukhiqiza. Siyakwamukela ku Xhumana nathi nganoma yiluphi uhlobo lombuzo.
