źоߴ 輺 ӵ ſ Ӱ ϴ iư ƴ϶ ü ϱ ̴.
Ʈũ ǹ̸ ִ. ̳ ǹ̸ Ÿ ٲ γ,ö,뼱 Ʈũ θ ִ. ⼭ ϴ Ʈũ Ʈũμ ٸ Ͱ ϴ ǹ̿ ųƮũ(Telecommunication Network) Ǵ Ÿ̶ Ѵ. ǥ μ ȭ , ѱ ȭ 1800 ̻ ȭڰ ӵǾ , ȭ ȭȣ ̳ 1800 ȣ߿ ̾ ȣ Ȯϰ ֵ Ǿ ִ. Ʈũ ö Ʈũ 츮 ü · . Ʈũ ü ľϱ ȭ θ Ǵ° .
繫() ȭ ϳϳ ڼ Ǿ ȭ ȯ ӵǾ , ڼ ϴ ȯ⸦ óȯ(LS : local switch, ϸ ڱȯ ) Ѵ. LS ġǾ ִ ȭ ټ ڸ ϱ ϵ Ől ߽ɿ ڸ , km~km ġǾ ־ .
ȯ ġ ̾ȣ ʷ
ġ ݾƼ ȭ ɰ ϴ ڼ ϴ ֵ ̴.
ϰ LS ӵ
쿡 LS ۷θ ӽŰ ȵȴ.
ÿȭ ΰ ξ . ̾ ڸ ȸȭ ĺϰ Ǹ LS ÿȭ ȯ⸦ Ͽ ϰ ⼭ ϴ Ǿִ. ȯ ȭ밡 £ λ, ֹ ĺϿ ۷θ ϴ ϰ ִ. ̿Ͱ ڿʹ ʰ ȯ ȯⰣ ߰ϴ ȯ⸦ ÿܱȯ Ǵ ÿ߰豳ȯ(TS : Toll Switch Ǵ TTS : Toll Transit Switch) θ.
ȭ ȭ ϴ ۷θ ۷ζ ϸ, ۷ üδ ̺, ũο̺ , ֱٿ ̺ ǰ ִ. Ÿ ª ΰ ִ ̺(Twisted Pair Cable, ϸ ִ뼱̺) DZ Ѵ.
۷δ Ʈ , ~λ갣 Ʈ ϴ ,ȣ ȸϴ ȸθ غϿ س ϰ ִ.
ȭ 쳻 輱̺ ڼ̶ Ѵ. ɿ ̺ ȭ ̷ , ְ̳ ܷ ֿ ȭ̺ Ǿ Եȴ.
̺ 鿩ٺ ڰ Ŵ ִµ ű ִ, ȭ̺ӿ Ǵ ٹ߷ Ǿ ִµ, ߿ ٹ߷ ڼ бǾ , ⼭ ϳ 輱Ǵ Ǿ ִ. Ǿ ó ߿ бϿ 輱ϰ ִµ Ͽ ȭڼ ȭ 輱ǰ ִ ũ ٸ. Ʈũ » ¼ ݸ ȭڼ ̴.
ڼ ȭ ߿ Ϸ ȭ Ϸκ ȭ ӵǴ Ϲ̴,
̺ ڼ ʷ 鼭 ǰ, ڼ ٱ ϰ Ǵµ ̸ ̶̺ ϸ, ̿ ֿ ɷִ ̺(̺) Ǵ ̺κ бǾ Ѱھ 輱ϴ ϱ 輱̶̺ θ.
ڼ 3 ̺ ַ Ǹ, ɼ ܰ 0.32mm, 0.4mm, 0.5mm, 0.65mm, 0.9mm ִ 0.3mm ַ ȭ 1km ̳, 0.9mm Ÿ ȴ. ̺ Ǵ ɼ 10 ִ 3600 ִ. Ǵ̺ 600 ̻ , 輱̺ Ǵ̺κ бǾ (輱) Ŀϸ ǹǷ 200~400 ϰ ̴.
LS ġǾ ִ ȭ 뱸 ڿ Ͽ ȭκ ڼ ӵǾ ִ, 뱸 ÿ 1.5km, ߵÿ ݰ 3km, ҵÿ ð̶ ݰ 7km ̳ ̴. ̴ Ÿ Ÿ ̺ ̴ ִ 10km 1.9km ̴(Ϻ )
̺ ̸ Ͽ μ, ο Ը Ʈ ǽ ǹ Ǹ ϰ Ǵ 찡 ִ. ġ ξ μϴ ȴ. 4 Ǵ ̺ ߿ A 輱 ̺ B 輱 ̺ ־д. A 䰡 Ǹ ̼ A ȭ ϱ ϰ ǰ B ʰ . ̷ ϸ ̺ ְ ȴ.
ϳ б · ӵǾ ִ 긮 ̶ Ѵ. ȭ ְ ϴ 3400Hz ļ ISDN ϴ 긮ǿ ݻ簡 Ͽ ȣ Ѵ. ֱٿ ż ̺ 긮 μ ʵ ϰ ִ.
8 ȸ 츮 ڼ ȯⰡ ʷ ġ ش 1895̴. ̾ 1902 3 20 -õ ſ ϴ ȭ ν 츮 ſ ȭ ۵Ǿ. 5(2, õ3) ڸ ſ ұԸ ̾. ݵ⸦ ġ鼭 1987 1000 ȸ Ͽ 93 2000 ȸ Ͽ 94 ȭ ȭ Ǿ. 95 10 ȭȸ 2148 ȸ̸ ڼ 1800 100δ 40 Ѿ α Ͽ.
Ϲ Ÿ ȭϿ Ÿ 5 .
ó ϴ ڸ Ƴ ȯ(LS)
A ۵Ǿ, ڼ ̰ Ǹ B ϳ
ȯ (б̶ ), Ϻ ڸ ο LS ̰Ͽ LS ȣ
۷(߰۷) Ѵ. ,õ ó 2
ϴ ִ.
ȯ ġǰ
C LS ȣ ߰輱 Ʈũ ȴ. LS
(mesh network)δ DZ Ϻ ȯ
ڸ ÿ LS ȯ ϴ
ϰ Ǿ.
, Ǿ D ȯ ϴ ߰豳ȯ(TS) ǰ, ư TS þ Ǹ E TSȣ ߰輱 Ʈũ ȴ.
E Ʈũ LS TS 2 Ǿ ִ. ̸ Ʈũ ϸ LS,TS (ͭ : office class Ǵ office rank) Ѵ. E 2 Ƿ 2, C ϳ ̱ Ǵ ̶ θ.
Ը Ÿ (hiersrchical structure) Ǵ Ϲ̴. ణ ٸ ü ⺻ ϸ 6-A 4 ȴ. ڿ ʺ ʷ ܱ(EO : End office), ߱(TC : Toll Center), ߽ɱ(DC : Disrict Center), Ѱ(RC : Regional Center) Ѵ. ̿ 䰡 а ڼ Ϲ 5 äϰ ִ.
״ 6-A A B ȭ ȭϴ
Ǽ θ Ǹ 4 ֻ ġ Ǿ 8ȸ
ȯ⸦ ϰ ȴ.
δ Ʈ
Ÿ ٿ ߰輱(Traverse Route) ġǾ ִ. ȯ߿
2 ̻ ϴ 뱳ȯ⸦ ġ ־ ȯ⸦ ϴ ȸ
ξ .
ϴ ΰ ȯ ۷
, ȯ 뷮,Ʈ ȴ.
Ϲ ȯ ΰ ۷ΰ θ ȯ ( )Ͽ ۷ ȿ ̸, ݴ ȯⰡ ΰ ۷ΰ θ ȯ ̴( ) ̵̴.
.
ֱٿ бȯ 뷮 ȯ ϰ Ǿ, ۷ ȭ ǰ ִ. 巡 Ʈũ ݱ Ͽ GC(Group unit Center) ZC(Zone Center) 2 ⺻ ϴ 6-B ǰ ִ.