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¹ : Էʵ෤оѧҹ

 



Сͺ ѧ

Ѳҡâͧ

ͧ

ǹСͺͧ

㹪ԵШѹ

ͧš

þѲкд

к͢¤Թ

ѭԸաѭҤСúاѡ촴ʡ

ҹ¹Դš

þѲкô

ѵػʧ¹
1.ö͡ѲҡкѾ͹
2.ö͡ٻẺ кͧ
3.͸ԺѡɳСҹͧ

.. ûдɰ ԴоѲ

2386 Alexander Bain ѡԡʡ͵дɰͧ

2387 Samuel Morse дɰ ҸԵ÷ӧҹͧͧŢ俿

2419 Alexander Graham Bell дɰͧѾ

2420 ѷ Western Union ԡѾҧ Somerville, MA Boston
㹻Ѱԡ

2436 պԡáШ§ŧ Ҥ ҹ͹ҹҧѾͧٴʵ

2449 Lee de Forest дɰʹ٭ҡ

2458 աǢѭҳʹحҡȤá E.T. Whitaker Ѳҷɮա Sampling 繾鹰ҹͧ෤ PCM TCM 㹻Ѩغѹ

2463 G. Valensi ѲҤԴǡѺ Time Domain Multiplexing

2469 Baird ʡ͵ Jenkins ԡҸԵͧ÷ȹʹ͹

2481 ѷ Bell ʹͪѾ (Central office Switches) Ẻ Crossbar

2482 John Atanasoff Clifford Berry дɰͧ硷͹ԡͧá

2497 ѷ⫹ʹͧԷطҹͧá

2500 觴ǧá Sputnik

2503 ѷ AT&T ԴкѾ硷͹ԡá

2511 ѷ AT&T Ѳ Integrated Digital Services Network (ISDN)

2512 աþѲԹ

2516 The File Transfer Protocol (FTP) Ethernet

2524 ѷ Hayes ʹ 300 Bps. ѷͺʹͧǹؤ աԡѾ͹ഹ

2530 Bellcore ʹͤԴ Asymmetric Digital Subscriber Ling (ADSL)

2535 Դ Word wide Web

2539 Rockwell ʹ 56 Kbps.

2544 ԡкäҤ͹ؤ 3

 
 

ѲҡâͧкѾ͹

кѾͶѾ͹աҹá㹹ëԤ ͻҳԺ к AMPS кѾ͹蹷 1 (1st Generation-1G) кաõԴҧʶҹ͹ʶҹհҹẺ FDMA (Frequency Division Multiple Access) ·ѭҳ§ٴж١Ẻ͹͡ ͡ҡк AMPS ѧкͧû NMT ͧ᡹

աþѲѾ͹蹷 2 (2st Generation-2G) кդ (Capacity) кʹ (Security) ͧѭҳСûͧѹ ͧŧ¹ к 2G ѡ TDMA (Time-Division Multiple Access) к 2G DAMPS ͧѰԡ GSM ͧû IS-95 cdmaOne ͧѰԡ PDC ͧ

ѺкäҤ蹷 (3st Generation-3G) ͧ÷ԨоѲк 3G ͧ÷û ԡ չ л ֡ҡԺ Ѩغѹա÷ͺҤʹ Ш㹻 .. 2544 þѲк 3G ըشʧѡ ͧ÷ҵðҹǡѹ (ҵðҹ IMT 2000) ʶҹ͹ öš Фͧ÷աѺ觢ŷǢ§͡Ѻҹŵ ·դسҾѴѺкäҤ (Fixed Line)Ҥҷ

˹ҷ 1 | 2

 

 
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