SS7<\/a> \u00e4r egentligen bara ett slutet signaleringssystem. Det anv\u00e4nds av noder (t.ex. grannskapsv\u00e4xel, MSC\/VLR, GMSC, etc.) i ett telekommunikationsn\u00e4tverk.<\/p>\nI Storbritannien \u00e4r det k\u00e4nt som c 7 (CCITT # 7), nummer 7 tillsammans med Common Channel Interoffice Signaling 7 (CCIS7).<\/p>\n
SS7-protokollet \u00e4r v\u00e4lk\u00e4nt f\u00f6r den v\u00e4rldsomsp\u00e4nnande anv\u00e4ndningen av Q.700-seriens tips fr\u00e5n 1988 av itu t.<\/p>\n
Internet Engineering Task Force (IETF) har definierat SIGTRAN-protokollpaketet som implementerar niv\u00e5 2, 3 och 4-protokoll harmoniskt med SS7. Det kallas ibland \u00e4ven Pseudo SS7 och \u00e4r uppbyggt kring transportmekanismen SCTP (Stream Control Transmission Protocol) som ska anv\u00e4ndas i Internet Protocol-n\u00e4tverk, som Internet.<\/p>\n
<\/p>\n
En kort historik \u00f6ver SS7<\/h2>\n
Fr\u00e5n och med 1960-talet har allm\u00e4nna kopplade telefonn\u00e4t (PSTN) byggts upp med hj\u00e4lp av analog teknik och flera signaleringsmetoder i bandet. \u00d6kningen av antalet vanliga slutanv\u00e4ndare av fast telefoni och det \u00f6kande behovet av avancerade tj\u00e4nster gjorde att gamla protokoll som R1 CAS snabbt blev attraktiva f\u00f6r tj\u00e4nsteleverant\u00f6rer. \u00c4ven ISDN-protokollrevolutionen visade sig vara ett stort steg f\u00f6r telekombranschen, som gick fr\u00e5n ett signaleringsprotokoll inom bandet (med toner, stulna bitar fr\u00e5n r\u00f6ststation eller fokuserad kanal) till signalering utanf\u00f6r bandet (separerad fr\u00e5n r\u00f6stkanaler) med meddelandebaserade primitiver anpassade f\u00f6r digitalt ljud.<\/p>\n
\u00c4ven om ISDN l\u00f6ste m\u00e5nga problem med \u00e4ldre protokoll, skedde aldrig n\u00e5gon massinstallation av ISDN fr\u00e5n k\u00e4rnsystemen, vilket l\u00e4mnade leverant\u00f6rerna med en komplicerad hierarki av utrustning som samverkade med varandra (eller f\u00f6rs\u00f6kte g\u00f6ra det). \u00c4ven om ISDN gjorde det l\u00e4ttare att tillhandah\u00e5lla till\u00e4ggsl\u00f6sningar (t.ex. samtal i v\u00e4ntel\u00e4ge, vidarekoppling) till slutanv\u00e4ndarna, flyttade ISDN successivt gr\u00e4nsen f\u00f6r detta system n\u00e4rmare slutanv\u00e4ndaren. Dessutom fanns det ingen leverant\u00f6r av verktyg som verkligen implementerade ISDN:s grundspecifikationer och d\u00e4rmed skapade en m\u00e4ngd olika varianter och nackdelar f\u00f6r systemintegrat\u00f6rer.<\/p>\n
<\/p>\n
Vid den tiden hade internationella konsortier b\u00f6rjat fokusera p\u00e5 att anv\u00e4nda en samordnad metod f\u00f6r att uppr\u00e4tta samtal, att presentera m\u00e5nga tj\u00e4nster (inklusive de som redan st\u00f6ds av ISDN och \u00e4ldre protokoll) och att kunna bygga ny programvara (f\u00f6retag) utan att beh\u00f6va f\u00f6rb\u00e4ttra hela n\u00e4tstrukturen. SS7 (eller Signaling System 7) tog flera \u00e5r innan det b\u00f6rjade anv\u00e4ndas \u00f6ver hela v\u00e4rlden men uppn\u00e5r nu det som det var avsett att uppn\u00e5: att tillhandah\u00e5lla en total kommunikationsstandard som erbjuder m\u00e5nga l\u00f6sningar och har f\u00f6rm\u00e5gan att v\u00e4xa med allm\u00e4nhetens krav.<\/p>\n
\u00c4ven om lokala versioner implementerades och m\u00e5nga \u00e4ndringar av protokollet skedde, ing\u00e5r detta signaleringsprotokoll nu i de flesta betydande telefonn\u00e4t \u00f6ver hela v\u00e4rlden. Det inneh\u00f6ll ocks\u00e5 en egenskap som var viktig f\u00f6r alla samh\u00e4llen runt om i v\u00e4rlden: feltolerans och robusthet. SS7 byggdes upp i flera funktionella grupper f\u00f6r att noderna i n\u00e4tverket inte ska beh\u00f6va utf\u00f6ra varje del av protokollstacken om de verkligen inte beh\u00f6ver det.<\/p>","protected":false},"excerpt":{"rendered":"
Signalsystem nr 7: SS7 - Signalsystem # 7 - har tidigare varit. Signaleringen och de flesta av de operationer som kan anv\u00e4ndas samlades med en hel del samarbete fr\u00e5n operat\u00f6rer \/ \/ leverant\u00f6rer \/ standardorganisationer (CCITT, ETSI, itu t, etc..) . SS7 \u00e4r egentligen bara en st\u00e4ngd signalering...<\/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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