SS7<\/a> on oikeastaan vain suljettu merkkij\u00e4rjestelm\u00e4. Sit\u00e4 k\u00e4ytt\u00e4v\u00e4t solmut (esim. naapurivaihde, MSC\/VLR, GMSC jne.) tietoliikenneverkossa.<\/p>\nYhdistyneess\u00e4 kuningaskunnassa se tunnetaan nimell\u00e4 c 7 (CCITT # 7), numero 7 sek\u00e4 Common Channel Interoffice Signaling 7 (CCIS7).<\/p>\n
SS7-protokolla tunnetaan hyvin maailmanlaajuisesta k\u00e4yt\u00f6st\u00e4 Q.700-sarjan vinkit vuodelta 1988 itu t.<\/p>\n
Internet Engineering Task Force (IETF) on m\u00e4\u00e4ritellyt SIGTRAN-protokollapaketin, joka toteuttaa tasojen kaksi, kolme ja nelj\u00e4 protokollat yhten\u00e4isesti SS7:\u00e4\u00e4 k\u00e4ytt\u00e4en. Joskus sit\u00e4 kutsutaan my\u00f6s nimell\u00e4 Pseudo SS7, ja se on linjattu SCTP (Stream Control Transmission Protocol) -kuljetusmekanismin ymp\u00e4rille k\u00e4ytett\u00e4v\u00e4ksi Internet Protocol -verkoissa, kuten Internetiss\u00e4.<\/p>\n
<\/p>\n
SS7:n lyhyt historia<\/h2>\n
1960-luvulta l\u00e4htien yleisi\u00e4 kytkent\u00e4isi\u00e4 puhelinverkkoja (PSTN) on rakennettu analogisen tekniikan ja useiden kaistan sis\u00e4isten merkinantomenetelmien avulla. Kiinte\u00e4n verkon loppuk\u00e4ytt\u00e4jien m\u00e4\u00e4r\u00e4n lis\u00e4\u00e4ntyminen ja edistyksellisten palvelujen kasvava kysynt\u00e4 kehittiv\u00e4t nopeasti R1 CAS:n kaltaiset vanhat protokollat houkutteleviksi palveluntarjoajille. Jopa ISDN-protokollan vallankumous osoittautui suureksi askeleeksi televiestint\u00e4alalla, kun siirryttiin kaistan sis\u00e4isest\u00e4 signalointiprotokollasta (\u00e4\u00e4nill\u00e4, \u00e4\u00e4niasemalta tai keskitetyst\u00e4 kanavasta varastetuilla biteill\u00e4) kaistan ulkopuoliseen signalointiin (erill\u00e4\u00e4n puhekanavista), jossa on digitaaliseen \u00e4\u00e4nentoistoon soveltuvia viestipohjaisia alkutekij\u00f6it\u00e4.<\/p>\n
Vaikka ISDN korjasi monia vanhempien protokollien ongelmia, sen massasijoittelua ydinj\u00e4rjestelmist\u00e4 ei koskaan tapahtunut, joten toimittajille j\u00e4i monimutkainen hierarkia, jossa laitteet toimivat (tai yrittiv\u00e4t toimia) toistensa kanssa. Vaikka ISDN tarjosi helpomman ratkaisun tarjota loppuk\u00e4ytt\u00e4jille lis\u00e4ratkaisuja (esim. puhelun pito, puhelunsiirto), ISDN siirtyi v\u00e4hitellen j\u00e4rjestelm\u00e4n rajalle l\u00e4hemm\u00e4s loppuk\u00e4ytt\u00e4j\u00e4\u00e4. Lis\u00e4ksi yksik\u00e4\u00e4n ty\u00f6kalujen tarjoaja ei toteuttanut aidosti ISDN:n perusm\u00e4\u00e4rittelyj\u00e4, mik\u00e4 loi runsaasti l\u00e4hivaihtoehtoja ja haittoja j\u00e4rjestelm\u00e4integraattoreille.<\/p>\n
<\/p>\n
Tuohon aikaan kansainv\u00e4liset konsortiot olivat alkaneet keskitty\u00e4 k\u00e4ytt\u00e4m\u00e4ll\u00e4 koordinoitua menetelm\u00e4\u00e4 puhelujen muodostamiseksi, monien palvelujen (my\u00f6s ISDN:n ja vanhojen protokollien jo tukemien palvelujen) esitt\u00e4miseksi sek\u00e4 uusien ohjelmistojen (yritysten) rakentamiseksi ilman, ett\u00e4 koko verkkorakennetta tarvitsisi parantaa. SS7 (tai Signaling System 7) kesti vuosia aikaisemmin saada k\u00e4ytt\u00f6\u00f6n koko planeetalla, mutta nyt se saavuttaa sen, mit\u00e4 se oli suunniteltu: tarjota sinulle t\u00e4ydellisen viestint\u00e4standardin, joka tarjoaa monia ratkaisuja ja jolla on kyky viljell\u00e4 yleis\u00f6n vaatimuksia.<\/p>\n
Vaikka paikallisia versioita otettiin k\u00e4ytt\u00f6\u00f6n ja protokollaan tehtiin lukuisia muutoksia, t\u00e4m\u00e4 merkinantoprotokolla on nyt mukana useimmissa merkitt\u00e4vimmiss\u00e4 puhelinverkoissa kaikkialla maailmassa. Se sis\u00e4lsi my\u00f6s ominaisuuden, joka oli merkitt\u00e4v\u00e4 jokaiselle yhteis\u00f6lle kaikkialla maailmassa: vikasietoisuuden ja kest\u00e4vyyden. SS7:n kerroksellisuus useissa toiminnallisissa ryhmiss\u00e4 rakennettiin siten, ett\u00e4 verkon solmujen ei tarvitse suorittaa jokaista protokollapinon osaa, jos ne eiv\u00e4t todellakaan vaadi sit\u00e4.<\/p>","protected":false},"excerpt":{"rendered":"
Signaalij\u00e4rjestelm\u00e4 nro 7: SS7 - Signaalij\u00e4rjestelm\u00e4 # 7 - on entinen. Merkinanto ja suurin osa k\u00e4ytett\u00e4vist\u00e4 operaatioista on koottu operaattoreiden \/ \/ myyjien \/ standardointij\u00e4rjest\u00f6jen (CCITT, ETSI, itu t, jne...) suurella yhteisty\u00f6ll\u00e4. SS7 on oikeastaan vain suljettu signalointi...<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-454","post","type-post","status-publish","format-standard","hentry","category-ss7-sms"],"yoast_head":"\n
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