\u50b3\u9001\u6280\u8853<\/p>\n\n\n\n
Baseband(\u57fa\u983b\u50b3\u9001\u6280\u8853)<\/strong> Broadband(\u5bec\u983b\u50b3\u9001\u6280\u8853)<\/strong> digital-to-digital\u6578\u4f4d\u8f49\u6578\u4f4d<\/strong>(encoding\u7de8\u78bc) NRZ(Nonreturn to Zero,\u4e0d\u6b78\u96f6)\/NRZ-L<\/strong> RS-232-C<\/strong> Zero-complemented\/differential encoding(\u5dee\u52d5\u5f0f\u7de8\u78bc)\/NRZI<\/strong> RZ(return to Zero,\u6b78\u96f6)<\/strong> Manchester(\u66fc\u5fb9\u65af\u7279\u7de8\u78bc)\/PE(Phase Encoding,\u76f8\u4f4d\u7de8\u78bc\/\u96d9\u76f8\u4f4d\u7de8\u78bc)<\/strong> Differential Manchester(\u5dee\u52d5\u5f0f\u66fc\u5fb9\u65af\u7279\u7de8\u78bc)<\/strong> digital data transmission(\u6578\u4f4d\u8cc7\u6599\u50b3\u8f38)<\/strong> …<\/p>\n\n\n\n multiplexing(\u591a\u5de5)\u3000<\/strong> FDM(frequency-division multiplexing,\u5206\u983b\u591a\u5de5)<\/strong>,\u6216\u7a31\u983b\u5206\u591a\u8def\u5fa9\u7528 OFDM(Orthogonal Frequency Division Multiplexing,\u6b63\u4ea4\u5206\u983b\u591a\u5de5)<\/strong> TDM(time-division multiplexing,\u5206\u6642\u591a\u5de5),\u6216\u7a31\u6642\u5206\u591a\u8def\u5fa9\u7528\u3000<\/strong> inverse multiplexing(\u53cd\u5411\u591a\u5de5)<\/strong> \u50b3\u9001\u6280\u8853 Baseband(\u57fa\u983b\u50b3\u9001\u6280\u8853)\u5c07\u8a0a\u865f\u4ee5\u539f\u4f86\u7684\u5f62\u5f0f …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"","fifu_image_alt":"","_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[30],"tags":[],"class_list":["post-764","post","type-post","status-publish","format-standard","hentry","category-networkconcept"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/posts\/764","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/comments?post=764"}],"version-history":[{"count":0,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/posts\/764\/revisions"}],"wp:attachment":[{"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/media?parent=764"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/categories?post=764"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/tags?post=764"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\u5c07\u8a0a\u865f\u4ee5\u539f\u4f86\u7684\u5f62\u5f0f\u50b3\u9001
\u4e3b\u8981\u61c9\u5728\u5340\u57df\u7db2\u8def\u4e2d\uff0c\u6578\u4f4d\u8a0a\u865f\u50b3\u9001\u53ea\u7528\u4e00\u500b\u983b\u9053<\/p>\n\n\n\n
\u5c07\u983b\u5bec\u5206\u5272\u6210\u8a31\u591a\u983b\u9053\u3002\u6bcf\u500b\u983b\u9053\u53ef\u6839\u64da\u5176\u983b\u5bec\u50b3\u9001\u9069\u7576\u7684\u8cc7\u6599
\u8a0a\u865f\u5728\u50b3\u9001\u524d\u9808\u5148Modulation(\u8abf\u8b8a)\uff0c\u6536\u5230\u5f8c\u8981\u505aDemodulation(\u89e3\u8abf)<\/p>\n\n\n\n
………………………………………………………..
\u8f49\u63db<\/p>\n\n\n\n
\u3000unipolar encoding(\u55ae\u6975\u6027)
\u3000polar encoding(\u6975\u6027):NRZ,RZ,biphase(\u96d9\u76f8\u6975),Manchester,Differential Manchester
\u3000bipolar encoding(\u96d9\u6975\u6027)\uff1aAMI(\u4ea4\u66ff\u5f0f\u53cd\u76f8\u906e\u7f69),\u96d9\u69758\u500b\u96f6\u53d6\u4ee3B8ZS,3-\u9ad8\u5bc6\u5ea6\u96d9\u6975\u6027HDB3
analog-to-digital conversion\u985e\u6bd4\u8f49\u6578\u4f4d<\/strong>\uff08demodulator\u89e3\u8abf\u8b8a\uff09
\u3000PAM(pluse amplitude modulation,\u8108\u885d\u8abf\u5e45)
\u3000PCM(pulse code modulation,\u535a\u78bc\u8abf\u8b8a)
digital-to-analog conversion\u6578\u4f4d\u8f49\u985e\u6bd4<\/strong>\uff08modulator\u8abf\u8b8a\uff09
\u3000ASK(amplitude shift keying,\u632f\u5e45\u79fb\u9375):\u53ea\u6539\u8b8a\u632f\u5e45\u8868\u793a\u4e8c\u9032\u4f4d
\u3000FSK(frequency shift keying,\u983b\u7387\u79fb\u9375):\u53ea\u6539\u8b8a\u983b\u7387\u8868\u793a\u4e8c\u9032\u4f4d
\u3000PSK(phase shift keying,\u76f8\u4f4d\u79fb\u9375):\u53ea\u6539\u8b8a\u76f8\u4f4d\u8868\u793a\u4e8c\u9032\u4f4d
\u3000QAM(quadrature amplitude modulation,\u6b63\u4ea4\u8abf\u5e45)\uff1aASK+PSK
analog-to-analog conversion\u985e\u6bd4\u8f49\u985e\u6bd4<\/strong>
\u3000AM(amplitude modulation,\u8abf\u5e45):\u8abf\u8b8a\u6234\u6ce2\u4e4b\u9ad8\u5ea6
\u3000FM(frequency modulation,\u8abf\u983b):\u8abf\u8b8a\u8f09\u6ce2\u4e4b\u983b\u7387
\u3000PM(phase modulation,\u76f8\u4f4d\u8abf\u8b8a):\u8abf\u8b8a\u6234\u6ce2\u4e4b\u6975\u6027(\u4f4d\u76f8)<\/p>\n\n\n\n
\u8ca0\u96fb\u4f4d\u8868\u793a0,\u6b63\u96fb\u4f4d\u8868\u793a1
\u7121\u540c\u6b65\u80fd\u529b
\u61c9\u7528\uff1a\u7528\u65bc\u5927\u90e8\u4efd\u7684\u901a\u8a0a\u7de8\u78bc
\u512a\u9ede\uff1a\u7c21\u55ae
\u7f3a\u9ede\uff1a\u7121\u63d0\u4f9b\u8f03\u4f73\u7684\u8a0a\u865f\u6821\u6b63\u529f\u80fd<\/p>\n\n\n\n
\u8ca0\u96fb\u4f4d\u8868\u793a1\uff0c\u6b63\u96fb\u4f4d\u8868\u793a0
\u61c9\u7528:\u5728\u8f03\u50b3\u7d71\u7684\u901a\u8a0a\u7dda\u8def\u4e0a\u505a\u4f4e\u901f\u8cc7\u6599\u50b3\u9001
EIA\u57281969\u5e74\u767c\u4f48<\/p>\n\n\n\n
\u6709\u96fb\u4f4d\u8b8a\u5316(\u6b63\u96fb\u4f4d\u5230\u8ca0\u96fb\u4f4d,\u8ca0\u96fb\u4f4d\u5230\u6b63\u4f4d)\u8868\u793a0,\u7121\u96fb\u4f4d\u8b8a\u5316\u8868\u793a1
\u61c9\u7528:IBM \u7684SDLC<\/p>\n\n\n\n
\u6b63\u96fb\u4f4d\u52300\u8868\u793a1,\u82e5\u7121\u5247\u8868\u793a1
\u6709\u540c\u6b65\u529f\u80fd
\u7f3a\u9ede\uff1a\u6240\u9700\u983b\u5bec\u8f03NRZ\u5927<\/p>\n\n\n\n
\u6b63\u96fb\u4f4d\u5230\u8ca0\u96fb\u4f4d\u8868\u793a0\uff0c\u8ca0\u96fb\u4f4d\u5230\u6b63\u96fb\u4f4d\u8868\u793a1
\u6709\u540c\u6b65\u529f\u80fd
\u61c9\u7528\uff1a\u61c9\u7528\u5728802.3
\u7f3a\u9ede\uff1a\u983b\u5bec\u8981\u6c42\u70baNRZ\u7684\u4e8c\u500d
ps:
\u7248\u672c1,\u8ca0\u96fb\u4f4d\u5230\u6b63\u96fb\u4f4d\u8868\u793a0,\u6b63\u96fb\u4f4d\u5230\u8ca0\u96fb\u4f4d\u8868\u793a1
G. E. Thomas, Andrew S. Tanenbaum,…etc, 1949
\u7248\u672c2,\u6b63\u96fb\u4f4d\u5230\u8ca0\u96fb\u4f4d\u8868\u793a0,\u8ca0\u96fb\u4f4d\u5230\u6b63\u96fb\u4f4d\u8868\u793a1<\/p>\n\n\n\n
\u8cc7\u6599\u4f4d\u5143\u8207\u4e0a\u500b\u8cc7\u6599\u4f4d\u5143,\u96fb\u4f4d\u8b8a\u5316\u76f8\u540c\u6642\u4ee3\u88680,\u8b8a\u5316\u76f8\u7570\u6642\u4ee3\u88681
\u61c9\u7528\uff1a802.4(Token-bus)\u53ca802.5(Token-ring)<\/p>\n\n\n\n
ps:
\u76f8\u4f4d\u5dee\u554f\u984c<\/strong>
\u7576\u8cc7\u6599\u5167\u5bb9\u51fa\u73fe\u4e00\u9577\u4e32\u76f8\u540c\u7684\u503c\u6642,\u50cf\u662f\u9023\u7e8c\u76841\u6216\u9023\u7e8c\u76840
\u7528Zero-complemented ,RS-232-C,…\u7b49\u7de8\u78bc,\u5e38\u6703\u9020\u6210\u63a5\u6536\u7aef\u5728\u63a5\u6536\u8cc7\u6599\u7684\u932f\u8aa4
\u539f\u56e0
\u3000\u5728\u50b3\u9001\u901f\u7387\u8207\u63a5\u6536\u901f\u7387\u5b8c\u5168\u76f8\u540c\u6642\u4e0d\u6703\u767c\u751f\u554f\u984c
\u3000\u4f46\u82e5\u6709\u4e00\u9ede\u5dee\u7570\uff0c\u5247\u5bb9\u6613\u9020\u6210\u76f8\u4f4d\u5dee(\u6642\u9593\u5dee)\uff0c\u96a8\u8457\u6642\u9593\u6162\u6162\u7d2f\u7a4d\u5f8c\uff0c\u6703\u5c0e\u81f4\u53d6\u6a23\u6642\u767c\u751f\u932f\u8aa4
\u89e3\u6c7a\u65b9\u6848
\u3000\u4f7f\u7528\u6709\u540c\u6b65\u529f\u80fd\u7684\u7de8\u78bc\uff0c\u53ef\u6e1b\u5c11\u9019\u6a23\u7684\u932f\u8aa4\u767c\u751f<\/p>\n\n\n\n
…………………………………………………………………………..<\/p>\n\n\n\n
\u7d93\u93c8\u7d50\u50b3\u8f38\u4e8c\u9032\u4f4d\u8cc7\u6599\u65b9\u5f0f\uff1a
parallel transmission(\u5e73\u884c\u6a21\u5f0f)\uff1a\u6bcf\u500b\u6642\u9418\u8108\u885d\u50b3\u9001\u591a\u500b\u4f4d\u5143,\u901f\u5ea6\u5feb\u6210\u672c\u9ad8\u8ddd\u96e2\u77ed
serial transmission(\u7cfb\u5217\u6a21\u5f0f)\uff1a\u6bcf\u500b\u6642\u9418\u8108\u885d\u50b3\u9001\u4e00\u500b\u4f4d\u5143,\u6210\u672c\u4f4e
\u3000asynchronous(\u975e\u540c\u6b65\u50b3\u8f38)\uff1a\u8f03\u6162
\u3000synchronous(\u540c\u6b65\u50b3\u8f38)\uff1a\u8f03\u5feb<\/p>\n\n\n\n
\u5728\u55ae\u4e00\u8cc7\u6599\u93c8\u4e0a,\u540c\u6642\u50b3\u8f38\u591a\u7a2e\u8a0a\u865f\u7684\u6280\u8853
\u8a0a\u865f\u4e09\u7a2e\u57fa\u672cmultiplexing\uff1aFDM,TDM,WDM<\/p>\n\n\n\n
\u591a\u500b\u4f7f\u7528\u8005\u5728\u76f8\u540c\u6642\u9593\u4f7f\u7528\u4e0d\u540c\u7684\u983b\u5bec\u4f86\u50b3\u9001\u8a0a\u606f
\u4e00\u7a2e\u985e\u6bd4\u6280\u8853,\u5c07\u6bcf\u500b\u50b3\u9001\u7aef\u7522\u751f\u8a0a\u865f\u8abf\u8b8a\u6210\u4e0d\u540c\u8f09\u6ce2\u983b\u7387,\u4e26\u7d44\u5408\u6210\u55ae\u4e00\u8907\u5408\u8a0a\u865f\u50b3\u9001<\/p>\n\n\n\n
\u591a\u8f09\u6ce2\u8abf\u8b8a\u6280\u8853\uff0c\u5c07\u53ef\u7528\u983b\u5bec\u5283\u5206\u70ba\u591a\u500b\u72f9\u7a84\u7684\u983b\u5e36\uff0c\u8b93\u8cc7\u6599\u53ef\u88ab\u5e73\u884c\u7684\u5728\u9019\u4e9b\u983b\u5e36\u4e0a\u50b3\u8f38
\u61c9\u7528\uff1a\u591a\u7528\u65bc\u7121\u7dda\u901a\u8a0a\u50b3\u8f38\u3000
\u512a\u9ede\uff1a\u53ef\u589e\u52a0\u983b\u5bec\u3001\u964d\u4f4e\u5e72\u64fe\u3001\u63d0\u9ad8\u4fdd\u5bc6\u6027\u4e26\u89e3\u6c7a\u591a\u8def\u5f91\u8870\u6e1b\u7b49\u901a\u8a0a\u969c\u7919
\u539f\u7406\uff1a\u5229\u7528\u96e2\u6563FFT(\u5feb\u901f\u5085\u5229\u8449\u8f49\u63db)\u548cIFFT(\u53cd\u5feb\u901f\u5085\u5229\u8449\u8f49\u63db)\u4f86\u8abf\u8b8a\u548c\u89e3\u8abf\u8b8a\u50b3\u9001\u7684\u8a0a\u865f
ps:
WDM(wave-division multiplexing,\u5206\u6ce2\u591a\u5de5):\u6982\u5ff5\u540cfdm,\u7528\u65bc\u5149\u8a0a\u865f
DWDM(dense WDM,\u9ad8\u5bc6\u5ea6\u5206\u6ce2\u591a\u5de5)<\/p>\n\n\n\n
\u591a\u500b\u4f7f\u7528\u8005\u5728\u4e0d\u540c\u6642\u9593\u4f7f\u7528\u76f8\u540c\u7684\u983b\u5bec,\u5c07\u8cc7\u6599\u8f2a\u6d41\u50b3\u51fa\u53bb
ex:T1,T2,T3,T4,SONET\/SDH
\u53ef\u5206\u70ba
\u540c\u6b65TDM:\u6bcf\u500btime slot(\u6642\u69fd)\u914d\u7f6e\u6642\u9593\u4e00\u6a23,\u4e0d\u7ba1\u6709\u7121\u8cc7\u6599\u8981\u50b3,ex:hdlc
\u975e\u540c\u6b65\/statistical\/Intelligent TDM:\u6bcf\u500btime slot\u914d\u7f6e\u5f48\u6027,\u4e0d\u6d6a\u8cbb<\/p>\n\n\n\n
\u5c07\u63a5\u6536\u5230\u7684\u8cc7\u6599\u6d41\u5728\u7d30\u5206\u89e3\u6210\u5c0f\u90e8\u4efd\u540c\u6642\u50b3\u9001<\/p>\n","protected":false},"excerpt":{"rendered":"