SS7<\/a> je ve skute\u010dnosti jen uzav\u0159en\u00fd signaliza\u010dn\u00ed syst\u00e9m. Pou\u017e\u00edvaj\u00ed ho uzly (nap\u0159. sousedsk\u00e1 \u00fast\u0159edna, MSC\/VLR, GMSC atd.) v telekomunika\u010dn\u00ed s\u00edti.<\/p>\nVe Velk\u00e9 Brit\u00e1nii je zn\u00e1m\u00e1 jako c 7 (CCITT # 7), \u010d\u00edslo 7 spolu s Common Channel Interoffice Signaling 7 (CCIS7).<\/p>\n
Protokol SS7 je dob\u0159e zn\u00e1m\u00fd z celosv\u011btov\u00e9ho pou\u017e\u00edv\u00e1n\u00ed tip\u016f \u0159ady Q.700 z roku 1988 podle itu t.<\/p>\n
Internet Engineering Task Force (IETF) definovala bal\u00ed\u010dek protokol\u016f SIGTRAN, kter\u00fd implementuje protokoly druh\u00e9, t\u0159et\u00ed a \u010dtvrt\u00e9 \u00farovn\u011b harmonicky vyu\u017e\u00edvaj\u00edc\u00ed SS7. N\u011bkdy se tak\u00e9 naz\u00fdv\u00e1 pseudo SS7 a je se\u0159azen kolem transportn\u00edho mechanismu SCTP (Stream Control Transmission Protocol), kter\u00fd se pou\u017e\u00edv\u00e1 v s\u00edt\u00edch s internetov\u00fdm protokolem, jako je Internet.<\/p>\n
<\/p>\n
Stru\u010dn\u00e1 historie SS7<\/h2>\n
Od 60. let 20. stolet\u00ed byly ve\u0159ejn\u00e9 komutovan\u00e9 telefonn\u00ed s\u00edt\u011b (PSTN) budov\u00e1ny s vyu\u017eit\u00edm analogov\u00fdch technologi\u00ed a tak\u00e9 n\u011bkolika metod signalizace v p\u00e1smu. N\u00e1r\u016fst po\u010dtu koncov\u00fdch u\u017eivatel\u016f b\u011b\u017en\u00e9 pevn\u00e9 telefonie a zvy\u0161uj\u00edc\u00ed se po\u017eadavky na progresivn\u00ed slu\u017eby rychle vedly k tomu, \u017ee se star\u00e9 protokoly jako R1 CAS staly pro poskytovatele slu\u017eeb atraktivn\u00edmi. Dokonce i protokolov\u00e1 revoluce ISDN se uk\u00e1zala b\u00fdt velk\u00fdm krokem v telekomunika\u010dn\u00edm byznysu, kter\u00fd p\u0159e\u0161el od signaliza\u010dn\u00edho protokolu v p\u00e1smu (s t\u00f3ny, ukraden\u00fdmi bity z hlasov\u00e9 stanice nebo zam\u011b\u0159en\u00e9ho kan\u00e1lu) k signalizaci mimo p\u00e1smo (odd\u011blen\u00e9 od hlasov\u00fdch kan\u00e1l\u016f) s primitivy zalo\u017een\u00fdmi na zpr\u00e1v\u00e1ch, kter\u00e9 jsou vhodn\u00e9 pro digit\u00e1ln\u00ed zvuk.<\/p>\n
I kdy\u017e ISDN napravovalo mnoho probl\u00e9m\u016f star\u0161\u00edch protokol\u016f, k jeho vlastn\u00ed masov\u00e9 instalaci z hlavn\u00edch syst\u00e9m\u016f nikdy nedo\u0161lo, a tak dodavatel\u016fm z\u016fstala propracovan\u00e1 hierarchie vz\u00e1jemn\u00e9 spolupr\u00e1ce za\u0159\u00edzen\u00ed (nebo se o ni sna\u017eili). P\u0159esto\u017ee ISDN poskytovala koncov\u00fdm u\u017eivatel\u016fm jednodu\u0161\u0161\u00ed \u0159e\u0161en\u00ed pro poskytov\u00e1n\u00ed dopl\u0148kov\u00fdch \u0159e\u0161en\u00ed (tj. podr\u017een\u00ed hovoru, p\u0159epojen\u00ed hovoru),\" ISDN se postupn\u011b st\u011bhovala k hranici tohoto syst\u00e9mu bl\u00ed\u017ee ke koncov\u00e9mu u\u017eivateli. Krom\u011b toho \u017e\u00e1dn\u00fd poskytovatel n\u00e1stroj\u016f skute\u010dn\u011b neimplementoval z\u00e1kladn\u00ed specifikace ISDN, \u010d\u00edm\u017e vznikla spousta sousedsk\u00fdch variant a nev\u00fdhod pro syst\u00e9mov\u00e9 integr\u00e1tory.<\/p>\n
<\/p>\n
V t\u00e9 dob\u011b se mezin\u00e1rodn\u00ed konsorcia za\u010dala soust\u0159edit na pou\u017e\u00edv\u00e1n\u00ed koordinovan\u00e9ho zp\u016fsobu navazov\u00e1n\u00ed hovor\u016f, na prezentaci mnoha slu\u017eeb (v\u010detn\u011b t\u011bch, kter\u00e9 ji\u017e byly podporov\u00e1ny protokoly ISDN a star\u0161\u00edmi protokoly) a tak\u00e9 na mo\u017enost budovat nov\u00fd software (spole\u010dnosti), ani\u017e by bylo nutn\u00e9 vylep\u0161ovat celou s\u00ed\u0165ovou strukturu. SS7 (neboli Signaliza\u010dn\u00ed syst\u00e9m 7) se po cel\u00e9 planet\u011b zav\u00e1d\u011bl ji\u017e n\u011bkolik let, ale nyn\u00ed dosahuje toho, co bylo jeho c\u00edlem: poskytuje celkov\u00fd komunika\u010dn\u00ed standard nab\u00edzej\u00edc\u00ed mnoho \u0159e\u0161en\u00ed a schopnost kultivovat se s po\u017eadavky ve\u0159ejnosti.<\/p>\n
I kdy\u017e byly zavedeny lok\u00e1ln\u00ed verze a do\u0161lo k \u010detn\u00fdm zm\u011bn\u00e1m tohoto protokolu, je nyn\u00ed tento signaliza\u010dn\u00ed protokol sou\u010d\u00e1st\u00ed v\u011bt\u0161iny v\u00fdznamn\u00fdch telefonn\u00edch s\u00edt\u00ed na cel\u00e9m sv\u011bt\u011b. Obsahoval tak\u00e9 vlastnost, kter\u00e1 byla v\u00fdznamn\u00e1 pro ka\u017edou komunitu na cel\u00e9m sv\u011bt\u011b: odolnost proti chyb\u00e1m a robustnost. D\u00edky tomu, \u017ee se SS7 rozvrstvuje do n\u011bkolika funk\u010dn\u00edch skupin, byl vytvo\u0159en tak, aby uzly v s\u00edti nemusely vykon\u00e1vat ka\u017edou \u010d\u00e1st z\u00e1sobn\u00edku protokol\u016f, pokud to opravdu nevy\u017eaduj\u00ed.<\/p>","protected":false},"excerpt":{"rendered":"
Signaliza\u010dn\u00ed syst\u00e9m \u010d. 7: SS7 - Signaliza\u010dn\u00ed syst\u00e9m # 7 - byl d\u0159\u00edve. Signalizace a v\u011bt\u0161ina operac\u00ed, kter\u00e9 lze pou\u017e\u00edt, byla sestavena za velk\u00e9 spolupr\u00e1ce oper\u00e1tor\u016f \/ \/ prodejc\u016f \/ standardn\u00edch organizac\u00ed (CCITT, ETSI, itu t, atd..) . SS7 je vlastn\u011b jen vlastn\u011b uzav\u0159en\u00e1 signalizace...<\/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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