Kebul ɗin SAS masu sauri: Haɗawa da Inganta Sigina

Kebul ɗin SAS masu sauri: Haɗawa da Inganta Sigina

Bayanan Ingancin Sigina

Wasu daga cikin manyan sigogi na ingancin sigina sun haɗa da asarar shigarwa, magana ta kusa da ƙarshe da ta nesa, asarar dawowa, karkacewar karkacewa a cikin nau'ikan nau'ikan bambance-bambance, da kuma girman daga yanayin bambancin zuwa yanayin gama gari. Kodayake waɗannan abubuwan suna da alaƙa kuma suna tasiri ga juna, za mu iya la'akari da kowane abu ɗaya bayan ɗaya don nazarin babban tasirinsa.
Asarar Shigarwa
Asarar shigarwa ita ce raguwar girman sigina daga ƙarshen watsawa zuwa ƙarshen karɓar kebul, kuma yana daidai da mita kai tsaye. Asarar shigarwa kuma ya dogara da ma'aunin waya, kamar yadda aka nuna a cikin jadawalin ragewa da ke ƙasa. Ga kayan ciki na gajerun zangon amfani da kebul na 30 ko 28-AWG, kebul masu inganci yakamata su sami raguwar ƙasa da 2 dB/m a 1.5 GHz. Ga SAS na waje 6 Gb/s ta amfani da kebul na 10m, ana ba da shawarar amfani da kebul masu matsakaicin ma'aunin waya na 24, waɗanda ke da raguwar 13 dB kawai a 3 GHz. Idan kuna son cimma ƙarin iyaka ta sigina a mafi girman ƙimar canja wurin bayanai, ƙayyade kebul masu ƙarancin raguwa a manyan mitoci don kebul masu tsayi, kamar SFF-8482 tare da kebul na POWER ko SlimSAS SFF-8654 8i.

Crosstalk
Crosstalk yana nufin adadin kuzarin da ake watsawa daga sigina ɗaya ko nau'in sigina zuwa wani sigina ko nau'in differential. Ga kebul na SAS, idan kusan ƙarshen magana (NEXT) bai isa ba, zai haifar da mafi yawan matsalolin haɗin. Ana gudanar da auna NEXT ne kawai a ƙarshen kebul ɗin, kuma girman kuzarin da aka canjawa wuri daga nau'in siginar watsawa zuwa nau'in karɓar shigarwa. Ana gudanar da auna magana ta nesa (FEXT) ta hanyar allurar sigina a cikin nau'in watsawa a ƙarshen kebul ɗin da kuma lura da adadin kuzarin da har yanzu ake riƙewa akan siginar watsawa a ɗayan ƙarshen kebul ɗin. NEXT a cikin abubuwan haɗin kebul da haɗin galibi yana faruwa ne saboda rashin ware nau'in bambancin sigina, wataƙila saboda soket da matosai, rashin cikakken tushe, ko kuma rashin kula da yankin ƙarewar kebul ɗin da bai dace ba. Masu tsara tsarin suna buƙatar tabbatar da cewa masu haɗa kebul sun magance waɗannan batutuwa uku, kamar a cikin sassan kamar MINI SAS HD SFF-8644 ko OCuLink SFF-8611 4i.

24, 26 da 28 sune nau'ikan lanƙwasa na asarar kebul na 100Ω na yau da kullun.

Ga haɗakar kebul masu inganci, NEXT da aka auna daidai da "SFF-8410 - Takamaiman buƙatun Gwajin Tagulla na HSS da Ayyukansa" ya kamata ya zama ƙasa da 3%. Dangane da S-sigogi, NEXT ya kamata ya fi 28 dB.
Asarar dawowa
Asarar dawowa tana auna girman kuzarin da aka nuna daga tsarin ko kebul lokacin da aka yi allurar sigina. Wannan kuzarin da aka nuna yana haifar da raguwar girman siginar a ƙarshen karɓar kebul kuma yana iya haifar da matsalolin amincin sigina a ƙarshen watsawa, wanda hakan na iya haifar da matsalolin tsangwama na lantarki ga masu tsara tsarin da tsarin.
Wannan asarar dawowa tana faruwa ne sakamakon rashin daidaiton impedance a cikin sassan kebul. Ta hanyar magance wannan matsalar da kyau ne kawai impedance ɗin ba zai iya canzawa ba lokacin da siginar ta ratsa soket, filogi, da tashoshin kebul, don rage bambancin impedance. Ma'aunin SAS-4 na yanzu yana sabunta ƙimar impedance daga ±10Ω a cikin SAS-2 zuwa ±3Ω. Kebul masu inganci yakamata su kula da buƙatun a cikin haƙurin na asali 85 ko 100 ± 3Ω, kamar SFF-8639 tare da SATA 15P ko MCIO 74 Pin Cable.

Murgudawar Skew
A cikin kebul na SAS, akwai nau'ikan karkatar da skew guda biyu: tsakanin nau'ikan nau'ikan bambance-bambance da kuma cikin nau'ikan bambance-bambance (ka'idar daidaiton sigina - siginar bambanci). A ka'ida, idan an shigar da sigina da yawa a lokaci guda a ƙarshen kebul ɗin, ya kamata su isa ɗayan ƙarshen a lokaci guda. Idan waɗannan sigina ba su iso a lokaci guda ba, wannan lamari ana kiransa karkatar da skew na kebul, ko kuma karkatar da delay-skew. Ga nau'ikan bambance-bambance, karkatar da skew a cikin nau'in bambance-bambancen shine jinkiri tsakanin masu jagoranci biyu na nau'in bambance-bambancen, yayin da karkatar da skew tsakanin nau'ikan bambance-bambancen shine jinkiri tsakanin saitin nau'ikan bambance-bambancen guda biyu. Babban karkatar da skew a cikin nau'in bambance-bambancen na iya lalata daidaiton bambancin siginar da aka watsa, rage girman sigina, ƙara jitter lokaci, da kuma haifar da matsalolin tsangwama na lantarki. Ga kebul masu inganci, karkatar da skew a cikin nau'in bambance-bambancen ya kamata ya zama ƙasa da ps 10, kamar SFF-8654 8i zuwa SFF-8643 ko kebul ɗin saka Anti-misalignment.
Tsangwamar lantarki
Akwai dalilai da yawa da ke haifar da matsalolin kutse a cikin kebul: rashin kariyar lantarki ko rashin kariyar, hanyar ƙasa mara kyau, siginar bambance-bambance marasa daidaito, da kuma ƙari, rashin daidaiton impedance shi ma yana haifar da hakan. Ga kebul na waje, kariyar da ƙasa na iya zama manyan abubuwa biyu da za a magance, kamar SFF-8087 tare da jan raga ko kebul na ƙasa na Cooper.
Yawanci, kariyar tsangwama ta waje ko ta lantarki ya kamata ta kasance garkuwa biyu ta ƙarfe da kuma layin da aka yi kitso, tare da rufewa gaba ɗaya na akalla 85%. A lokaci guda, ya kamata a haɗa wannan kariyar da jaket ɗin waje na mahaɗin, tare da cikakken haɗin 360°. Ya kamata a ware kariyar nau'ikan daban-daban daga kariyar waje, kuma layukan tacewa ya kamata su ƙare a siginar tsarin ko ƙasan DC don tabbatar da haɗin kai tsakanin abubuwan haɗin da kebul, kamar kebul na haɗin SFF-8654 8i Full Wrap anti-slash ko Scoop-proof.