Umuyoboro wihuse wa SAS: Umuhuza hamwe na Optimisation ya signal

Umuyoboro wihuse wa SAS: Umuhuza hamwe na Optimisation ya signal

Ikimenyetso Cyuzuye

Bimwe mubyingenzi byingenzi byerekana uburinganire bwibimenyetso birimo igihombo cyo kwinjiza, hafi-iherezo na kure-kurengana, gutakaza igihombo, kugoreka skew mubice bitandukanye, hamwe na amplitude kuva muburyo butandukanye kugeza muburyo busanzwe. Nubwo ibyo bintu bifitanye isano kandi bigira uruhare runini, turashobora gusuzuma buri kintu kimwekimwe kugirango twige ingaruka zibanze.
Gutakaza
Igihombo cyo gushiramo ni uguhuza ibimenyetso bya amplitude kuva ihererekanyabubasha kugeza ku iherezo ryakiriwe rya kabili, kandi biragereranywa na frequence. Igihombo cyo gushiramo nacyo giterwa nugupima insinga, nkuko bigaragara ku gishushanyo cya attenuation hepfo. Kubice bigufi byimbere ukoresheje insinga 30 cyangwa 28-AWG, insinga zo murwego rwohejuru zigomba kugira attenuation ya munsi ya 2 dB / m kuri 1.5 GHz. Kuri 6 Gb / s SAS yo hanze ukoresheje insinga 10m, birasabwa gukoresha insinga zifite impuzandengo ya wire ya 24, ifite attenuation ya 13 dB gusa kuri 3 GHz. Niba ushaka kugera ku bimenyetso byinshi ku gipimo cyo hejuru cyo kohereza amakuru, vuga insinga hamwe na attenensiya yo hasi kuri frequency nyinshi kuri insinga ndende, nka SFF-8482 hamwe na POWER kabili cyangwa SlimSAS SFF-8654 8i.

Crosstalk
Crosstalk bivuga ingano yingufu zihererekanwa kuva kimenyetso kimwe cyangwa gutandukana kubindi bimenyetso cyangwa bibiri bitandukanye. Ku nsinga za SAS, niba hafi-iherezo ryambukiranya (NEXT) atari rito bihagije, bizatera ibibazo byinshi byihuza. Ibipimo BIKURIKIRA bikorwa gusa kuruhande rumwe rwumugozi, kandi nubunini bwingufu zavanywe mubisohoka byerekana ibimenyetso byinjira byinjira byinjira. Ibipimo byambukiranya imipaka (FEXT) bikorwa mugutera inshinge mumashanyarazi kumurongo umwe wumugozi no kureba ingufu zikigumaho kubimenyetso byoherejwe kurundi ruhande rwumugozi. GIKURIKIRA mubice bigize insinga hamwe nu muhuza mubisanzwe biterwa no kwigunga nabi kubimenyetso bitandukanye, birashoboka bitewe na socket na plugs, kubutaka butuzuye, cyangwa gufata nabi ahantu harangirira insinga. Abashushanya sisitemu bakeneye kwemeza ko abateranya insinga bakemuye ibyo bibazo bitatu, nko mubice nka MINI SAS HD SFF-8644 cyangwa OCuLink SFF-8611 4i.

24, 26 na 28 nibisanzwe 100Ω yo gutakaza umurongo.

Kumateraniro yujuje ubuziranenge, NEXT yapimwe hakurikijwe "SFF-8410 - Ibisobanuro byo gupima umuringa wa HSS nibisabwa" igomba kuba munsi ya 3%. Kubijyanye na S-parameter, GIKURIKIRA bigomba kuba birenze 28 dB.
Garuka igihombo
Gutakaza igihombo gipima ubunini bwingufu zigaragara muri sisitemu cyangwa umugozi mugihe ikimenyetso cyatewe. Izi mbaraga zigaragaza zitera kugabanuka kwa amplitude yikimenyetso kumpera yakira ya kabili kandi birashobora gutuma habaho ibibazo byubusugire bwikimenyetso ku ihererekanyabubasha, ibyo nabyo bikaba bishobora gutera ibibazo bya electromagnetiki yivanga kuri sisitemu nabashushanya sisitemu.
Iki gihombo cyo kugaruka giterwa no kudahuza ibice bigize insinga. Gusa mugukemura iki kibazo neza cyane impedance ntishobora guhinduka mugihe ibimenyetso byanyuze mumaseti, amacomeka, hamwe na kabili ya terefone, kugirango bigabanye itandukaniro rya impedance. Ibisanzwe SAS-4 isanzwe ivugurura agaciro ka impedance kuva ± 10Ω muri SAS-2 kugeza ± 3Ω. Intsinga nziza cyane igomba gukomeza ibisabwa muburyo bwo kwihanganira nominal 85 cyangwa 100 ± 3Ω, nka SFF-8639 hamwe na SATA 15P cyangwa MCIO 74 Pin Cable.

Kugoreka
Mu nsinga za SAS, hari ubwoko bubiri bwo kugoreka skew: hagati ya babiri batandukanye no mubice bibiri bitandukanye (inyigisho yerekana ubudakemwa - ibimenyetso bitandukanye). Mubyukuri, niba ibimenyetso byinshi byinjijwe icyarimwe kuruhande rumwe rwumugozi, bigomba kugera kurundi ruhande icyarimwe. Niba ibyo bimenyetso bitageze icyarimwe, iki kintu cyitwa kugorora kabili, cyangwa gutinda-kugoreka. Kubintu bibiri bitandukanye, kugoreka skew muburyo butandukanye nubukererwe hagati yabayobora bombi ba couple itandukanye, mugihe kugoreka skew hagati yabantu batandukanye nubukererwe hagati yuburyo bubiri butandukanye. Kugoreka kwinshi kwa skew muburyo butandukanye birashobora kwangiriza itandukaniro ryikimenyetso cyatanzwe, kugabanya ibimenyetso bya amplitude, kongera igihe, kandi bigatera ibibazo bya interineti ya electronique. Kumugozi wo murwego rwohejuru, kugoreka skew muburyo butandukanye bigomba kuba munsi ya 10 ps, ​​nka SFF-8654 8i kugeza SFF-8643 cyangwa insinga yo Kurwanya Anti-misalignment.
Kwivanga kwa electronique
Hariho impamvu nyinshi zitera ibibazo bya electromagnetic kwivanga mumigozi: gukingira nabi cyangwa kutagira gukingira, uburyo bwo gutaka butari bwo, ibimenyetso bitandukanye bitandukanijwe, nibindi, kudahuza impedance nabyo ni impamvu. Ku nsinga zo hanze, gukingira no guhagarara birashoboka ko aribintu bibiri byingenzi bigomba gukemurwa, nka SFF-8087 hamwe na mesh itukura cyangwa umugozi wa Cooper mesh.
Mubisanzwe, gukingira hanze cyangwa electromagnetic kwikingira gukingira bigomba kuba gukingira kabiri ibyuma bya fayili hamwe nigitambambuga, hamwe muri rusange byibuze 85%. Muri icyo gihe, iyi ngabo igomba guhuzwa na jacket yo hanze ihuza, hamwe na 360 ° yuzuye. Kurinda ibice byombi bitandukanye bigomba gutandukanywa no gukingirwa hanze, kandi imirongo yabo yo kuyungurura igomba kurangirira kuri sisitemu ya sisitemu cyangwa kubutaka bwa DC kugirango hamenyekane igenzura rihuriweho kubihuza nibice bya kabili, nka SFF-8654 8i Wrap yuzuye anti-slash cyangwa umugozi wa Scoop-proof.