Matambo eSAS anomhanya Zvikuru: MaConnector uye Kugadzirisa Masaini

Matambo eSAS anomhanya Zvikuru: MaConnector uye Kugadzirisa Masaini

Magadzirirwo eSignali Kuvimbika

Zvimwe zvezvinhu zvikuru zvekuvimbika kwechiratidzo zvinosanganisira kurasikirwa kwekuisa, kutaura kwepedyo neparutivi uye kure, kurasikirwa kwekudzoka, kukanganiswa kweskew mukati mezvikamu zvakasiyana, uye amplitude kubva pamodhi yekuchinja kuenda kune yakajairika. Kunyangwe zvinhu izvi zvakabatana uye zvichipesvedzerana, tinogona kufunga nezvechinhu chimwe nechimwe panguva imwe chete kuti tidzidze kukosha kwacho.
Kurasikirwa Kwekuisa
Kurasikirwa kwekuisa chiratidzo ndiko kuderedzwa kwehukuru hwechiratidzo kubva kumagumo ekutumira kuenda kumagumo ekugamuchira tambo, uye zvinoenderana zvakananga nefrequency. Kurasikirwa kwekuisa kunoenderanawo negeji yewaya, sezvakaratidzwa mugirafu rekudzikisa tambo riri pazasi. Kune zvikamu zvemukati zvepfupi zvinoshandisa tambo dze30 kana 28-AWG, tambo dzemhando yepamusoro dzinofanira kunge dzisisiri pasi pe2 dB/m pa1.5 GHz. Kune dzekunze 6 Gb/s SAS uchishandisa tambo dze10m, zvinokurudzirwa kushandisa tambo dzine avhareji yewaya ye24, dzine kudzikiswa kwe13 dB chete pa3 GHz. Kana uchida kuwana margin yakawanda yechiratidzo pamitengo yakakwira yekutumira data, taura tambo dzine kudzikiswa kwakaderera pafrequency yakakwira yetambo refu, dzakadai seSFF-8482 netambo yePOWER kana SlimSAS SFF-8654 8i.

Kutaurirana kweCrosstalk
Crosstalk inoreva huwandu hwesimba rinotumirwa kubva kune imwe signal kana differential pair kuenda kune imwe signal kana differential pair. Kune tambo dzeSAS, kana near-end crosstalk (NEXT) isiri diki zvakakwana, inokonzera matambudziko mazhinji e link. Kuyerwa kweNEXT kunongoitwa chete kune rimwe divi retambo, uye ihukuru hwesimba rinotamiswa kubva kune output transmission signal pair kuenda kune input receiving pair. Kuyerwa kwe far-end crosstalk (FEXT) kunoitwa nekupinza signal mu transmission pair kune rimwe divi retambo uye kutarisa kuti simba rakawanda sei richiripo pa transmission signal kune rimwe divi retambo. NEXT muzvikamu zvetambo uye zvinobatanidza zvinowanzo kukonzerwa nekusabatanidzwa zvakanaka kwe signal differential pair, pamwe nekuda kwema socket nema plugs, kusakwana kwe grounding, kana kusabatwa zvakanaka kwenzvimbo yekugumisa tambo. Vagadziri vesystem vanofanirwa kuona kuti cable assemblers vagadzirisa nyaya idzi nhatu, senge muzvikamu zvakaita seMINI SAS HD SFF-8644 kana OCuLink SFF-8611 4i.

24, 26 uye 28 ndiwo makomba akajairika ekurasikirwa kwetambo ye100Ω.

Kune tambo dzemhando yepamusoro dzinoshandiswa pakubatanidza, NEXT yakayerwa zvichienderana ne "SFF-8410 - Tsanangudzo yeHSS Copper Testing and Performance Requirements" inofanira kunge yakaderera pane 3%. Kana iri S-parameter, NEXT inofanira kunge yakakura kupfuura 28 dB.
Kurasikirwa kwekudzoka
Kurasikirwa kwekudzoka kunoyera hukuru hwesimba rinobuda kubva musystem kana tambo kana chiratidzo chaiswa. Simba iri rinobuda rinokonzera kudzikira kwehukuru hwechiratidzo pamucheto wetambo unogamuchira uye zvinogona kukonzera matambudziko ekuvimbika kwechiratidzo pamucheto wekutumira, izvo zvinogona kukonzera matambudziko ekupindirana kwemagetsi kune vagadziri vesystem nevagadziri vesystem.
Kurasikirwa uku kwekudzoka kunokonzerwa nekusawirirana kweimpedance muzvikamu zvetambo. Kungotarisa dambudziko iri nekungwarira chete ndiko kunogona kuita kuti impedance isachinje kana chiratidzo chikapfuura nemasoketi, maplugs, uye ma terminals etambo, kuitira kuderedza kusiyana kweimpedance. SAS-4 standard iripo inovandudza kukosha kweimpedance kubva pa ±10Ω muSAS-2 kusvika pa ±3Ω. Tambo dzemhando yepamusoro dzinofanira kuchengetedza zvinodiwa mukati me 85 kana 100 ± 3Ω, senge SFF-8639 neSATA 15P kana MCIO 74 Pin Cable.

Kukanganisa kwakakombama
Mumatambo eSAS, kune mhando mbiri dzekukanganiswa kwe skew: pakati pemaviri akasiyana uye mukati me maviri akasiyana (signal integrity theory - differential signal). Panyaya iyi, kana masaini akawanda akaiswa panguva imwe chete pamugumo mumwe wetambo, anofanira kusvika kune rimwe divi panguva imwe chete. Kana masaini aya asingasvike panguva imwe chete, chiitiko ichi chinonzi cable skew distortion, kana delay-skew distortion. Kune mawiri akasiyana, skew distortion mukati me differential pair kunonoka pakati pema conductor maviri e differential pair, nepo skew distortion pakati pemawiri akasiyana iri kunonoka pakati pemaseti maviri e differential pairs. Kukanganiswa kukuru kwe skew mukati me differential pair kunogona kukanganisa differential balance ye transmission signal, kuderedza amplitude yesignal, kuwedzera time jitter, uye kukonzera matambudziko e electromagnetic interference. Kune matambo emhando yepamusoro, skew distortion mukati me differential pair inofanira kunge iri pasi pe10 ps, ​​senge SFF-8654 8i kuenda kuSFF-8643 kana Anti-misalignment Insertion cable.
Kupindirana kwemagetsi
Kune zvikonzero zvakawanda zvinokonzera matambudziko ekupindirana kwemagetsi mumagetsi: kusadzivirira zvakanaka kana kusadzivirira, nzira isiriyo yekudzika pasi, zviratidzo zvekusiyanisa zvisina kuenzana, uye zvakare, kusawirirana kweimpedance ndicho chimwe chezvikonzero. Kune tambo dzekunze, kudzivirira nekudzikisa pasi zvinogona kunge zviri zvinhu zviviri zvakakosha kugadziriswa, zvakaita seSFF-8087 ine mesh tsvuku kana tambo yekudzika pasi yeCooper mesh.
Kazhinji, dziviriro yekunze kana yemagetsi inofanira kunge iri dziviriro mbiri dzesimbi nesimbi yakarukwa, ine chifukidziro chese che85%. Panguva imwe chete, dziviriro iyi inofanira kunge yakabatana nejaketi rekunze rechinobatanidza, nekubatana kwakakwana kwe360°. Dziviriro yemapairi ega ega ega ega inofanira kuparadzaniswa nedziviriro yekunze, uye mitsetse yavo yekusefa inofanira kugumira pachiratidzo chesystem kana pasi peDC kuti ive nechokwadi chekuti inodzora impedance yekubatanidza nezvikamu zvetambo, zvakaita seSFF-8654 8i Full Wrap anti-slash kana Scoop-proof connector cable.