SS7<\/a> val\u00f3j\u00e1ban csak egy lez\u00e1rt jelz\u0151rendszer. A t\u00e1vk\u00f6zl\u00e9si h\u00e1l\u00f3zat csom\u00f3pontjai (pl. szomsz\u00e9ds\u00e1gi k\u00f6zpont, MSC\/VLR, GMSC stb.) haszn\u00e1lj\u00e1k.<\/p>\nAz Egyes\u00fclt Kir\u00e1lys\u00e1gban c 7 (CCITT # 7), a 7-es sz\u00e1m \u00e9s a Common Channel Interoffice Signaling 7 (CCIS7) n\u00e9ven ismert.<\/p>\n
Az SS7 protokollt vil\u00e1gszerte j\u00f3l ismert a Q.700-sorozat\u00fa tippek 1988-ban az itu t \u00e1ltal.<\/p>\n
Az Internet Engineering Task Force (IETF) meghat\u00e1rozta a SIGTRAN protokollcsomagot, amely az SS7 protokollok seg\u00edts\u00e9g\u00e9vel harmonikusan val\u00f3s\u00edtja meg a m\u00e1sodik, harmadik \u00e9s negyedik szint\u0171 protokollokat. N\u00e9ha Pseudo SS7-nek is nevezik, \u00e9s az SCTP (Stream Control Transmission Protocol) sz\u00e1ll\u00edt\u00e1si mechanizmus k\u00f6r\u00e9 van felsorakoztatva, amelyet az Internet Protocol h\u00e1l\u00f3zatokon, p\u00e9ld\u00e1ul az interneten lehet haszn\u00e1lni.<\/p>\n
<\/p>\n
Az SS7 r\u00f6vid t\u00f6rt\u00e9nete<\/h2>\n
Az 1960-as \u00e9vekt\u0151l kezdve a nyilv\u00e1nos kapcsolt telefonh\u00e1l\u00f3zatokat (PSTN) anal\u00f3g technol\u00f3gi\u00e1k \u00e9s t\u00f6bb s\u00e1von bel\u00fcli jel\u00e1tviteli m\u00f3dszer felhaszn\u00e1l\u00e1s\u00e1val \u00e9p\u00edtett\u00e9k fel. A k\u00f6z\u00f6s vezet\u00e9kes telefonos v\u00e9gfelhaszn\u00e1l\u00f3k sz\u00e1m\u00e1nak n\u00f6veked\u00e9se \u00e9s a progressz\u00edv szolg\u00e1ltat\u00e1sok ir\u00e1nti n\u00f6vekv\u0151 ig\u00e9ny gyorsan fejlesztette a r\u00e9gi protokollokat, mint p\u00e9ld\u00e1ul az R1 CAS, hogy vonz\u00f3v\u00e1 v\u00e1ljanak a szolg\u00e1ltat\u00f3k sz\u00e1m\u00e1ra. M\u00e9g az ISDN protokoll forradalma is nagy l\u00e9p\u00e9snek bizonyult a t\u00e1vk\u00f6zl\u00e9si \u00fczlet\u00e1gban, amely egy s\u00e1von bel\u00fcli jelz\u00e9si protokollban (hangokkal, lopott bitekkel a hang\u00e1llom\u00e1sr\u00f3l vagy a f\u00f3kusz\u00e1lt csatorn\u00e1r\u00f3l) a s\u00e1von k\u00edv\u00fcli (a hangcsatorn\u00e1t\u00f3l elv\u00e1lasztott) jelz\u00e9si protokollra v\u00e1ltott, \u00fczenetalap\u00fa, digit\u00e1lis hanghoz illesztett primit\u00edvekkel.<\/p>\n
M\u00e9g ha az ISDN a r\u00e9gebbi protokollok sz\u00e1mos probl\u00e9m\u00e1j\u00e1t jav\u00edtotta is, saj\u00e1t t\u00f6meges telep\u00edt\u00e9se az alaprendszerekb\u0151l soha nem t\u00f6rt\u00e9nt meg, \u00edgy a sz\u00e1ll\u00edt\u00f3k a berendez\u00e9sek egym\u00e1s k\u00f6z\u00f6tti egy\u00fcttm\u0171k\u00f6d\u00e9s\u00e9nek bonyolult hierarchi\u00e1j\u00e1val maradtak (vagy pr\u00f3b\u00e1lkoztak). Annak ellen\u00e9re, hogy az ISDN k\u00f6nnyebb megold\u00e1st ny\u00fajtott a v\u00e9gfelhaszn\u00e1l\u00f3k sz\u00e1m\u00e1ra kieg\u00e9sz\u00edt\u0151 megold\u00e1sok (pl. h\u00edv\u00e1start\u00e1s, h\u00edv\u00e1s\u00e1tir\u00e1ny\u00edt\u00e1s) ny\u00fajt\u00e1s\u00e1ra,\" az ISDN fokozatosan a rendszer v\u00e9gfelhaszn\u00e1l\u00f3hoz k\u00f6zelebbi hat\u00e1ra fel\u00e9 v\u00e1ndorolt. Ezenk\u00edv\u00fcl egyetlen eszk\u00f6zszolg\u00e1ltat\u00f3 sem val\u00f3s\u00edtotta meg val\u00f3ban az ISDN alapspecifik\u00e1ci\u00f3kat, ez\u00e1ltal rengeteg szomsz\u00e9ds\u00e1gi v\u00e1ltozatot \u00e9s h\u00e1tr\u00e1nyt teremtve a rendszerintegr\u00e1torok sz\u00e1m\u00e1ra.<\/p>\n
<\/p>\n
Abban az id\u0151ben a nemzetk\u00f6zi konzorciumok a h\u00edv\u00e1sok l\u00e9trehoz\u00e1s\u00e1nak \u00f6sszehangolt m\u00f3dszer\u00e9vel kezdtek \u00f6sszpontos\u00edtani, hogy sz\u00e1mos szolg\u00e1ltat\u00e1st (bele\u00e9rtve az ISDN \u00e9s az id\u0151sebb protokollok \u00e1ltal m\u00e1r t\u00e1mogatottakat) bemutathassanak, valamint hogy \u00faj szoftvereket (c\u00e9geket) \u00e9p\u00edthessenek an\u00e9lk\u00fcl, hogy a teljes h\u00e1l\u00f3zati strukt\u00far\u00e1t fejleszteni kellene. Az SS7 (vagy a 7-es jelz\u0151rendszer) \u00e9vekkel kor\u00e1bban az eg\u00e9sz bolyg\u00f3n elterjedt, de mostanra el\u00e9rte azt, amire tervezt\u00e9k: egy teljes kommunik\u00e1ci\u00f3s szabv\u00e1nyt biztos\u00edt, amely sz\u00e1mos megold\u00e1st k\u00edn\u00e1l, \u00e9s k\u00e9pes a nyilv\u00e1noss\u00e1g ig\u00e9nyeivel egy\u00fctt m\u0171velni.<\/p>\n
M\u00e9g akkor is, amikor helyi v\u00e1ltozatok ker\u00fcltek bevezet\u00e9sre, \u00e9s a protokoll sz\u00e1mos m\u00f3dos\u00edt\u00e1sa t\u00f6rt\u00e9nt, ez a jelz\u00e9si protokoll ma m\u00e1r a vil\u00e1g legjelent\u0151sebb telefonh\u00e1l\u00f3zataihoz csatlakozik. Olyan tulajdons\u00e1got is tartalmazott, amely a vil\u00e1g minden egyes k\u00f6z\u00f6ss\u00e9ge sz\u00e1m\u00e1ra jelent\u0151s volt: a hibat\u0171r\u00e9st \u00e9s a robusztuss\u00e1got. Az SS7 t\u00f6bb funkcion\u00e1lis csoportban r\u00e9tegezve \u00e9p\u00fclt fel annak \u00e9rdek\u00e9ben, hogy a h\u00e1l\u00f3zat csom\u00f3pontjai ne kelljen a protokoll stack minden r\u00e9sz\u00e9t v\u00e9grehajtaniuk, ha nem igaz\u00e1n ig\u00e9nylik.<\/p>","protected":false},"excerpt":{"rendered":"
A 7. jelz\u0151rendszer: SS7 - # 7 jelz\u0151rendszer - kor\u00e1bban volt. A jelz\u00e9s \u00e9s a legt\u00f6bb haszn\u00e1lhat\u00f3 m\u0171t\u00e9tet az \u00fczemeltet\u0151k \/ \/ gy\u00e1rt\u00f3k \/ szabv\u00e1nyszervezetek (CCITT, ETSI, itu t, stb..) nagym\u00e9rt\u00e9k\u0171 egy\u00fcttm\u0171k\u00f6d\u00e9s\u00e9vel \u00e1ll\u00edtott\u00e1k \u00f6ssze. Az SS7 val\u00f3j\u00e1ban val\u00f3j\u00e1ban csak egy lez\u00e1rt jelz\u00e9s...<\/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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