Iinkqubo zanamhlanje zokugcina azikhuli kuphela kwii-terabits kwaye zinezinga eliphezulu lokudlulisa idatha, kodwa zifuna amandla amancinci kwaye zithatha indawo encinci.Ezi nkqubo zikwafuna uqhagamshelo olungcono ukubonelela ngokuguquguquka ngakumbi.Abaqulunqi bafuna unxibelelwano oluncinci ukubonelela ngeereyithi zedatha ezifunekayo namhlanje okanye kwixesha elizayo.Kwaye okuqhelekileyo ukusuka ekuzalweni ukuya ekuphuhlisweni kwaye ngokuthe ngcembe kuvuthiwe kukude nomsebenzi wosuku.Ngokukodwa kwishishini le-IT, nayiphi na iteknoloji ihlala iphucula kwaye iguqukela ngokwayo, njengokuba i-Serial Attached SCSI (SAS) inkcazo.Njengomlandeli we-SCSI ehambelanayo, inkcazo ye-SAS sele ikhona ixesha elide.
Kwiminyaka eyadlulayo i-SAS, iinkcukacha zayo ziphuculwe, nangona iprotocol esisiseko igciniwe, ngokusisiseko akukho tshintsho luninzi kakhulu, kodwa iinkcukacha zomdibaniso wonxibelelwano lwangaphandle ziye zatshintsha ezininzi, oluluhlengahlengiso olwenziweyo. I-SAS ukuziqhelanisa nokusingqongileyo kwemarike, ngala “manyathelo ongezelelweyo ukuya kwiwaka lemayile” ngokuqhubekayo uphuculo, iinkcukacha ze-SAS ziye zakhula ngokwandayo.Izihlanganisi ezidityanisiweyo zeenkcukacha ezahlukeneyo zibizwa ngokuba yi-SAS, kwaye utshintsho ukusuka kwi-parallel ukuya kwi-serial, ukusuka kwitekhnoloji ye-SCSI ehambelanayo ukuya kwi-SCSI eqhagamshelweyo yetekhnoloji (SAS) itshintshe kakhulu iskimu sokuhamba kwentambo.I-SCSI ehambelanayo yangaphambili inokusebenza enye-ekuphelayo okanye umahluko kwiitshaneli ezili-16 ukuya kuthi ga kwi-320Mb/s.Okwangoku, i-interface ye-SAS3.0 exhaphake kakhulu kwindawo yokugcina ishishini isasetyenziswa kwimarike, kodwa i-bandwidth iphindwe kabini ngokukhawuleza njenge-SAS3 engazange iphuculwe ixesha elide, eliyi-24Gbps, malunga ne-75 I-% ye-bandwidth ye-PCIe3.0 × 4 ye-slid-state drive eqhelekileyo.Isidibanisi samva nje seMiniSAS esichazwe kwiinkcukacha ze-SAS-4 sincinci kwaye sivumela ukuxinana okuphezulu.Isidibanisi samva nje seMini-SAS sisiqingatha sobukhulu besiqhagamshelo sokuqala se-SCSI kunye ne-70% yobukhulu besidibanisi se-SAS.Ngokungafaniyo nentambo yokuqala ye-SCSI ehambelanayo, zombini i-SAS kunye ne-Mini SAS zineziteshi ezine.Nangona kunjalo, ukongeza kwisantya esiphezulu, ukuxinana okuphezulu, kunye nokuguquguquka okungakumbi, kukwakho ukwanda kobunzima.Ngenxa yobukhulu obuncinci bomdibaniso, umenzi wekhebula wokuqala, i-cable assembler, kunye nomyili wenkqubo kufuneka bahlawule ingqwalasela enkulu kwiiparamitha zemfezeko yomqondiso kuyo yonke indibano yentambo.
Ayizizo zonke ii-cable assemblers ezikwaziyo ukubonelela ngeempawu eziphezulu zesantya esiphezulu ukuhlangabezana neemfuno zengqibelelo yomqondiso weenkqubo zokugcina.Abahlanganisi bekhebula badinga izisombululo ezikumgangatho ophezulu kunye neendleko ezifanelekileyo kwiinkqubo zokugcina zamva nje.Ukuze uvelise iindibano zekhebula ezizinzile, ezihlala ixesha elide, izinto ezininzi kufuneka ziqwalaselwe.Ukongeza ekugcineni umgangatho womatshini kunye nokucubungula, abaqulunqi kufuneka banikele ingqwalasela enkulu kwimilinganiselo yengqibelelo yomqondiso eyenza iintambo zesixhobo sememori yesantya esiphezulu senzeke.
Iimpawu zemfezeko yomqondiso (Ngowuphi umqondiso ogqityiweyo?)
Ezinye zeeparameters eziphambili zengqibelelo yesignali ziquka ukulahlekelwa kokufaka, i-crosstalk kufuphi-ekupheleni kunye ne-de-end, ukulahleka kokubuyisela, ukuphazamiseka kwe-skew ye-disorder pair ngaphakathi, kunye ne-amplitude yemodi yokuhluka kwimodi eqhelekileyo.Nangona ezi zinto zinxibelelene kwaye zinempembelelo enye kwenye, sinokuqwalasela into enye ngexesha ukuze sifunde eyona mpembelelo yayo.
Ilahleko yokufaka (Iiparamitha eziziinqanaba eliphezulu Iziseko ezingundoqo 01- iiparamitha zokuthomalalisa)
Ilahleko yokufaka ilahleko ye-amplitude yesignali ukusuka ekupheleni kokudlulisa intambo ukuya ekupheleni kokufumana, okuhambelana ngokuthe ngqo kwi-frequency.Ilahleko yokufaka nayo ixhomekeke kwinombolo yocingo, njengoko kubonisiwe kumzobo wokuthomalalisa apha ngezantsi.Kuluhlu olufutshane lwamacandelo angaphakathi ekhebula le-30 okanye i-28-AWG, intambo yomgangatho olungileyo kufuneka ibe ngaphantsi kwe-2dB/m yokuthomalalisa kwi-1.5GHz.Kwi-6Gb / s SAS yangaphandle usebenzisa iintambo ze-10m, intambo ene-avareji yokulinganisa umgca we-24 iyanconywa, ene-13dB kuphela yokunciphisa kwi-3GHz.Ukuba ufuna umda wesignali othe kratya kumazinga aphezulu edatha, khankanya intambo enokuthotywa kancinci kwizandi eziphezulu zeentambo ezinde.
I-Crosstalk (Iiparamitha eziPhakamileyo eziBalulekileyo 03- iiparamitha zeCrosstalk)
Ubungakanani bamandla athunyelwa ukusuka kumqondiso omnye okanye umahluko phakathi kwesibini ukuya kwenye.Kwiintambo ze-SAS, ukuba i-crosstalk esondeleyo (i-NEXT) ayincinci ngokwaneleyo, iya kubangela iingxaki ezininzi zekhonkco.Umlinganiselo we-NEXT wenziwa kuphela ekupheleni kwentambo, kwaye yimali yamandla adluliselwe kwi-output transmission signal pair ukuya kwi-input receive pair.I-Far-end crosstalk (FEXT) ilinganiswa ngokutofa umqondiso wesibini sothumelo kwelinye icala lentambo kunye nokujonga ukuba angakanani amandla asele kwisignali yothumelo kwelinye icala lentambo.
OKULANDELAYO kwindibano yekhebula kunye nekhonkco ngokuqhelekileyo kubangelwa ukuhlukaniswa okungahambi kakuhle kwezibini ezihlukeneyo zesignali, ezinokubangelwa ngamaziko kunye neeplagi, isiseko esingagqibekanga, okanye ukuphathwa kakubi kwendawo yokuyeka intambo.Umyili wenkqubo kufuneka aqinisekise ukuba i-cable assembler ijongene nale miba mithathu.
Ilahleko igophe kwiintambo eziqhelekileyo ze-100Ω ze-24, 26, kunye ne-28
Indibano yentambo yomgangatho olungileyo ngokuhambelana ne- "SFF-8410-Specification for HSS Copper Testing and Performance Requirements" ezilinganiswe OKULANDELAYO kufuneka zibe ngaphantsi kwe-3%.Ngokubhekiselele kwi-s-parameter, OKULANDELAYO kufuneka kube nkulu kuno-28dB.
Ilahleko yokuBuyisa (IiParameters eziPhakamileyo eziBalulekileyo 06- Ilahleko yokuBuyisa)
Ukulinganisa ilahleko yokubuyisela ubungakanani bamandla abonakaliswe kwisistim okanye intambo xa umqondiso utofwa.La mandla abonakalisiweyo anokubangela ukuhla komqondiso we-amplitude ekupheleni kokufumana intambo kwaye kunokubangela iingxaki zemfezeko yomqondiso ekupheleni kokuhambisa, okunokubangela iingxaki zokuphazamiseka kombane wenkqubo kunye nabayili benkqubo.
Le lahleko yokubuyisela ibangelwa ukungahambelani kwe-impedance kwindibano yentambo.Kuphela ngokuphatha le ngxaki ngononophelo olukhulu ukuthintela umqondiso ungatshintshi xa udlula kwi-socket, iplagi kunye ne-terminal terminal, ukwenzela ukuba utshintsho lwe-impedance luncitshiswe.Umgangatho wangoku we-SAS-4 uhlaziywa kwixabiso le-impedance ye-±3Ω xa kuthelekiswa ne-±10Ω ye-SAS-2, kwaye iimfuno zeentambo ezisemgangathweni kufuneka zigcinwe ngaphakathi kokunyamezela okuqhelekileyo kwe-85 okanye i-100±3Ω.
Skew ukugqwetheka
Kwiintambo ze-SAS, kukho izinto ezimbini ezigqwethekileyo: phakathi kwababini abahlukeneyo kunye naphakathi kwezibini ezihlukeneyo (uphawu oluhlukileyo lwethiyori yemfezeko yomqondiso).Kwithiyori, ukuba imiqondiso emininzi ifakwe kwelinye icala lentambo, kufuneka ifike kwelinye icala ngaxeshanye.Ukuba le miqondiso ayifiki ngexesha elifanayo, le nto ibizwa ngokuba yi-skew distortion yekhebula, okanye ukulibaziseka-skew ukuphazamiseka.Kwizibini ezahlukeneyo, ukugqwethwa kwe-skew ngaphakathi kwesibini esingafaniyo kukulibaziseka phakathi kweengcingo ezimbini zedibansi ezahlukeneyo, kunye nokuphazamiseka kwe-skew phakathi kwee-different pairs kukulibaziseka phakathi kweeseti ezimbini zokwahlukana kwezibini.Ugqweso olukhulu lwe-skew yesibini esingafaniyo luya kuwenza mandundu umlinganiso womlinganiso wesignali egqithisiweyo, ukunciphisa i-amplitude yesignali, ukonyusa ixesha le-jitter kwaye kubangele iingxaki zokuphazamiseka kwe-electromagnetic.Umahluko wekhebula lomgangatho olungileyo kwi-skew distortion yangaphakathi kufuneka ibe ngaphantsi kwe-10ps
Ixesha lokuposa: Nov-30-2023