{"id":750,"date":"2008-06-12T11:04:00","date_gmt":"2008-06-12T03:04:00","guid":{"rendered":"http:\/\/note.systw.net\/note\/?p=750"},"modified":"2023-11-06T20:56:00","modified_gmt":"2023-11-06T12:56:00","slug":"transmission-media","status":"publish","type":"post","link":"https:\/\/systw.net\/note\/archives\/750","title":{"rendered":"Transmission Media"},"content":{"rendered":"\n

\u50b3\u8f38\u5a92\u9ad4\u4e09\u5927\u554f\u984c:
attenuation(\u8a0a\u865f\u8870\u6e1b)\uff1a\u7531\u8a0a\u865f\u9001\u51fa\u6642\u80fd\u91cf\u7684\u640d\u5931
\u3000\u5ef6\u9072\u5e72\u64fe\uff1a\u901f\u5ea6\u4e0a\u7684\u5dee\u7570\u9020\u6210\u63a5\u6536\u8a0a\u865f\u6642distortion(\u5931\u771f)
noise(\u96dc\u8a0a)\uff1a\u4f86\u81ea\u50b3\u9001\u7aef\u7684\u591a\u9918\u80fd\u91cf,\u5206\u70ba
\u3000thermal noise(\u71b1\u6d41\u96dc\u8a0a)\uff1a\u7531\u7dda\u8def\u4e0a\u96fb\u5b50\u7684\u96a8\u6a5f\u79fb\u52d5\u9020\u6210,\u7121\u6cd5\u907f\u514d
\u3000\u4ea4\u53c9\u901a\u8a71,\u6216\u7a31Cross Talk(\u4e32\u97f3):\u9644\u8fd1\u5c0d\u7dda\u6240\u7522\u751f\u7684\u96dc\u8a0a
\u3000\u96fb\u6d41\u6d41\u7d93\u5c0e\u9ad4\u90fd\u6703\u7522\u751fRFI(Radio Frequency Interference,\u96fb\u6ce2\u5e72\u64fe)\u76f8\u9130\u7684\u5c0e\u9ad4\u7684\u96fb\u6d41\u65b9\u5411\u4e00\u81f4,\u5f7c\u6b64\u5e72\u64fe\u6703\u91cd\u758a,\u96fb\u6d41\u65b9\u5411\u76f8\u53cd\u5247\u5f7c\u6b64\u62b5\u6d88
impulse noise(\u8108\u885d\u96dc\u8a0a)\uff1a\u7531\u96fb\u6e90\u7dda\u4e0a\u7684\u7a81\u6ce2\u6216\u5176\u4ed6\u539f\u56e0\u9020\u6210\u7684

……………………………………………………………………………………………………………………….
……………………………………………………………………………………………………………………….

wireless communication(\u7121\u7dda\u901a\u8a0a)<\/strong>
\u8207\u6709\u7dda\u7684\u5dee\u7570\u6027
\u3000decreased signal strength(\u8a0a\u865f\u5f37\u5ea6\u7684\u8870\u6e1b)
<\/strong>\u3000\u3000\u4f4e\u983b\u53ef\u7a7f\u8d8a\u7269\u9ad4,\u4f46\u80fd\u91cf\u96a8\u8ddd\u96e2\u905e\u6e1b,\u4e5f\u7a31\u70bapath loss(\u8def\u5f91\u640d\u8017)\u3000
\u3000\u3000\u9ad8\u983b\u6642\u6210\u76f4\u7dda\u6613\u53d7\u7269\u9ad4\u5e72\u64fe,\u6240\u6709\u983b\u7387\u7686\u6613\u53d7\u96fb\u5b50\u88dd\u5099\u5e72\u64fe
\u3000multipath proagation(\u591a\u8def\u5f91\u50b3\u64ad)<\/strong>:\u8a0a\u865f\u50b3\u9001\u6642\u6703\u5411\u56db\u9762\u516b\u65b9\u767c\u9001,\u6703\u5c0e\u81f4\u63a5\u6536\u7aef\u6536\u5230\u7684\u8a0a\u865f\u6a21\u7cca\u4e0d\u6e05
\u3000interference from other sources<\/strong>:\u6613\u53d7\u5e72\u64fe,\u7121\u6cd5\u5075\u6e2c\u78b0\u649e<\/p>\n\n\n\n

interference\u5927\u81f4\u5206\u70ba:<\/strong>
\u3000narrowband(\u7a84\u983b):<\/strong>\u8207spread-spectrum\u76f8\u5c0d\u7684\u6280\u8853
\u3000\u7c21\u6613\u7684\u89e3\u6c7a\u65b9\u6cd5\u662f\u6539\u8b8aap\u4f7f\u7528\u7684\u901a\u9053,\u4e5f\u53ef\u4f7f\u7528spectrum analyzer(\u983b\u8b5c\u5206\u6790\u5100)\u627e\u51fa\u7a84\u983b\u4f86\u6e90
\u3000\u5e72\u64fe\u539f\u56e0\u5305\u62eccb\u7121\u7dda\u96fb\u6216\u9999\u8178\u65cf\u7121\u7dda\u96fb
\u3000all band(\u6240\u6709\u6ce2\u6bb5):<\/strong>
\u3000bluetooth\u6bcf\u79d2\u6703\u57282.4ghz\u7bc4\u570d\u9644\u8fd1\u8df3\u8e8d\u6578\u6b21,\u6703\u9020\u6210802.11b\u7db2\u8def\u4e0a\u4e4b\u56b4\u91cd\u5e72\u64fe\u3000
\u3000\u5fae\u6ce2\u7210\u6563\u51fa\u7684microwave(\u5fae\u6ce2),\u5373\u4f7f\u662f1\u74e6\u7279\u4e5f\u6703\u5c0dradio frequency(\u7121\u7dda\u96fb\u983b\u7387)\u9020\u6210\u5e72\u64fe
\u3000\u4f7f\u75282.4ghz\u983b\u8b5c\u7684\u7121\u7dda\u96fb\u8a71,\u4e5f\u6703\u9020\u6210\u7db2\u8def\u6548\u80fd\u4e0b\u964d
\u3000weather(\u6c23\u5019)<\/strong>
\u3000\u6fc3\u9727\u6216\u9ad8\u6fd5\u5ea6\u7684\u74b0\u5883\u6703\u5f71\u97ff\u7121\u7dda\u7db2\u8def\u7684\u901a\u8a0a\u54c1\u8cea
\u3000\u9583\u96fb\u53ef\u80fd\u5c0d\u5927\u6c23\u5145\u96fb,\u800c\u6539\u8b8a\u4e86\u50b3\u8f38\u8a0a\u7684\u8def\u5f91 <\/p>\n\n\n\n

ps:
hidden terminal problem(\u96b1\u85cf\u7aef\u9ede\u554f\u984c)
B\u53ef\u9023\u5230A\u548cC,\u4f46A\u8207C\u7121\u6cd5\u4e92\u9023, \u6703\u5e72\u64feB
\u969c\u7919\u7269\u548cSignal attenuation\/fading(\u8870\u6e1b)\u90fd\u6703\u7522\u751f\u6b64\u554f\u984c 
\u4e0d\u904e\u6b64\u554f\u984c\u53ef\u900f\u904eRTS\/CTS\u6a5f\u5236\u89e3\u6c7a<\/p>\n\n\n\n

…<\/p>\n\n\n\n

\u5be6\u9ad4\u5c64\u7279\u6027<\/strong>
SNR\u8d8a\u9ad8,BER\u8d8a\u4f4e
\u5728\u76f8\u540cSNR\u4e0b,\u9ad8\u4f4d\u5143\u50b3\u8f38\u901f\u7387\u7684\u8abf\u8b8a\u6280\u8853,\u6703\u6709\u8f03\u9ad8\u7684BER
ex:qam256(8Mbps)\u6703\u6bd4qam16(4mbps)\u6709\u8f03\u9ad8\u7684BER,\u4f46\u82e5BER\u904e\u9ad8,\u9ad8\u901f\u7387\u4e5f\u7121\u7528
ps:
SNR\u548cBER\u8b8a\u5316\u6642,\u5e38\u900f\u904e\u52d5\u614b\u5730\u9078\u64c7\u8abf\u8b8a\u6280\u8853,\u662f\u70ba\u4e86\u5728\u5408\u7406\u7684BER\u4e0b\u7528\u6700\u9ad8\u901f\u7387
ps:
SNR(signal-to-noise ratio,\u8a0a\u865f\u96dc\u8a0a\u6bd4):\u6536\u5230\u7684\u8a0a\u865f\u8207\u96dc\u8a0a\u5f37\u5ea6\u7684\u76f8\u5c0d\u8a08\u91cf\u55ae\u4f4d,\u4ee5dB(\u5206\u8c9d)\u70ba\u55ae\u4f4d
BER(bit error ratio,\u4f4d\u5143\u932f\u8aa4\u7387)<\/p>\n\n\n\n

… <\/p>\n\n\n\n

\u5e38\u898b\u7684\u50b3\u8f38\u65b9\u5f0f\u6709\u4ee5\u4e0b:<\/strong>
\u7121\u7dda\u96fb\u6ce2\uff1a\u983b\u7387\u7bc4\u570d75khz-10mhz\u4e4b\u9593\u7684\u96fb\u78c1\u6ce2,\u4e5f\u7a31RF(radio frequency,\u5c04\u983b)\u96fb\u6ce2,\u53ef\u5728\u6bcf\u500b\u65b9\u5411\u5ee3\u64ad,\u591a\u983b\u7387,\u983b\u7387\u6108\u9ad8,\u50b3\u9001\u6108\u9060
Microwave(\u5fae\u6ce2)\uff1a\u983b\u7387\u7bc4\u570d0.3ghz-300ghz\u9593,\u6ce2\u9577\u7bc4\u570d\u7d04\u57281m\u81f31mm,\u4ee5\u76f4\u7dda\u50b3\u9001,\u7528\u65bc\u9577\u9014\u96fb\u8a71\u901a\u8a0a,\u884c\u52d5\u96fb\u8a71,\u96fb\u8996,\u50b3\u64ad,\u6703\u88ab\u96e8\u6c34\u5438\u6536,\u7d93\u6fdf(\u6bcf50\u516c\u91cc\u8a2d\u5fae\u6ce2\u5854\u5373\u53ef)
IR(infrared,\u7d05\u5916\u7dda)\u53ca\u6beb\u7c73\u6ce2\uff1a\u6ce2\u9577\u57281\u6beb\u7c73\u5230770\u5948\u7c73\u4e4b\u9593,\u77ed\u7a0b\u901a\u8a0a,\u7528\u65bc\u6416\u63a7\u5668\u7b49,\u7121\u6cd5\u7a7f\u8d8a\u7269\u9ad4
\u5149\u6ce2\u50b3\u8f38\uff1a\u5169\u7aef\u4e92\u67b6\u96f7\u5c04(\u542b\u96f7\u5c04\u5668\u53ca\u5149\u6aa2\u6e2c\u5668),\u983b\u5bec\u9ad8\u6210\u672c\u4f4e,\u4f46\u4e0d\u80fd\u8cab\u7a7f\u5169\u6c34\u6216\u539a\u9727

\u983b\u6bb5\u5206\u70ba<\/strong>:
\u4e00\u822c\u983b\u6bb5:\u9700\u57f7\u7167\u4e5f\u9700\u82b1\u9322\u8cfc\u8cb7
ISM\u983b\u6bb5:\u5de5\u696d\u79d1\u5b78\u91ab\u7528\u983b\u6bb5,\u53ef\u4efb\u610f\u4f7f\u7528\u983b\u7387\u50b3\u8f38,\u4f46\u7bc4\u570d\u5c0f\u4e0d\u6703\u4e92\u76f8\u5e72\u64fe,\u4e14\u4e0d\u9700\u57f7\u7167\u4f7f\u7528\u7684\u983b\u6bb5
\u5404\u570b\u898f\u5b9a\u4e0d\u540c,\u5982\u7f8e\u570b\u7684ISM\u6709902-928MHz,2400-2484.5MHz,5725-5850MHz,\u800c\u6b50\u6d32\u662f900Mhz,\u5404\u570b\u5171\u540c\u7684\u662f2.4ghz<\/p>\n\n\n\n

\u5e38\u7528\u983b\u6bb5\u8aaa\u660e<\/strong>
900mhz:\u53ef\u652f\u63f4\u884c\u52d5\u96fb\u8a71\u53ca\u5176\u5b83\u7684\u6d88\u8cbb\u6027\u7522\u54c1,\u56e0\u6b64band\u592a\u904e\u64c1\u64e0,\u6703\u5e38\u78b0\u5230\u5e73\u64fe\u60c5\u6cc1
2.4ghz:\u6700\u5927\u50b3\u8f38\u7bc4\u570d\u53ef\u905425\u82f1\u54e9,\u6613\u53d7\u5fae\u6ce2\u7210\u53ca\u96fb\u9054\u8a2d\u5099\u5e72\u64fe,\u85cd\u82bd\u53ca\u4e00\u4e9b802.11,802.11g,802.11b\u4f7f\u7528
5ghz:\u4f9b\u9ad8\u901f\u6578\u64da\u88dd\u7f6e\u4f7f\u7528,802.11a\u4f7f\u7528<\/p>\n\n\n\n

……………………

\u7121\u7dda\u96fb\u8a71
cordless phone(\u5ba4\u5167\u7121\u7dda\u96fb\u8a71)
mobile phone(\u884c\u52d5\u96fb\u8a71),\u4e5f\u7a31cell phone(\u8702\u5de2\u5f0f\u96fb\u8a71)
\u7b2c\u4e00\u4ee3\u884c\u52d5\u96fb\u8a71\uff1a\u985e\u6bd4\u5f0f\u8072\u97f3<\/strong>
IMTS(improved mobile telephone system,\u6539\u826f\u5f0f\u7684\u884c\u52d5\u96fb\u8a71\u7cfb\u7d71)
AMPS(advanced mobile phone system,\u5148\u9032\u5f0f\u884c\u52d5\u96fb\u8a71\u7cfb\u7d71)
\u5728\u65e5\u672c\u7528\u70baMCS-L1,\u5728\u82f1\u570b\u7528\u70baTACS,\u6b64\u8a2d\u5099\u88ab\u7a31\u70ba\u8702\u5de2\u5f0f\u7cfb\u7d71
\u5c0f\u7cfb\u7d71\u4e2d\u7684\u6240\u6709\u57fa\u5730\u53f0\u6703\u9023\u5230MTSO(\u884c\u52d5\u5f0f\u96fb\u8a71\u4ea4\u63db\u5c40)\u6216MSC(\u884c\u52d5\u4ea4\u63db\u4e2d\u5fc3)\u7684\u8a2d\u5099
ps:
\u5f9e\u4e00\u500b\u57fa\u5730\u53f0\u5230\u53e6\u4e00\u500b\u53eb\u4ea4\u905ehandoff,\u53c8\u5206\uff1a
soft handoff(\u8edf\u5f0f\u4ea4\u905e)
hard handoff(\u786c\u5f0f\u4ea4\u905e)
\u7b2c\u4e8c\u4ee3\u884c\u52d5\u96fb\u8a71\uff1a\u6578\u4f4d\u5f0f\u8072\u97f3,voice channels<\/strong>
D-AMPS(\u6578\u4f4d\u5f0f\u5148\u9032\u884c\u52d5\u96fb\u8a71\u7cfb\u7d71),AMPS\u7b2c\u4e8c\u4ee3,\u63a1FDM\u548cTDM\u5c07\u983b\u8b5c\u5206\u5272\u70ba\u983b\u9053
IS-136 TDMA,
GSM(global system for mobile communications,\u5168\u7403\u884c\u52d5\u901a\u8a0a\u7cfb\u7d71)\uff1a\u548cDAMPS\u985e\u5f0f,\u6574\u5408FDMA\u548cTDMA\u6280\u8853  
CDMA(code division multiple access,\u5206\u78bc\u591a\u91cd\u5b58\u53d6):\u7b2c\u4e09\u4ee3\u884c\u52d5\u96fb\u8a71\u57fa\u790e
PDC(personal communication services,\u500b\u4eba\u901a\u8a0a\u670d\u52d9):\u53ea\u5728\u65e5\u672c\u7528,D-AMPS\u4fee\u6539\u7248
2.5G,voice and data channel
<\/strong>EDGE(enhanced data rates for gsm evolution,GSM\u589e\u5f37\u578b\u8cc7\u6599\u50b3\u8f38\u7387)
GPRS(general packet radio service,\u6574\u5408\u5c01\u5305\u7121\u7dda\u96fb\u670d\u52d9):\u5efa\u69cb\u65bcD-AMPS\u6216GSM\u4e0a\u7684\u8986\u84cb\u5c01\u5305\u7db2\u8defoverlay ip network
3G(\u7b2c\u4e09\u4ee3\u884c\u52d5\u96fb\u8a71)\uff1a\u6578\u4f4d\u5f0f\u8a9e\u97f3\u53ca\u8cc7\u6599
<\/strong>W-CDMA(wideband-CDMA,\u5bec\u983b\u591a\u78bc\u591a\u91cd\u5b58\u53d6)\uff1aericsson\u63d0\u51fa,\u63a1DSSS,\u53ef\u548cGSM\u4e92\u9023
\u6b50\u76df\u529b\u63a8\u6b64\u7cfb\u7d71\u4e26\u7a31\u4e4bUMTS(universal mobile telecommunication system,\u5168\u7403\u884c\u52d5\u96fb\u8a0a\u7cfb\u7d71)
CDMA2000:qualcomm\u63d0\u51fa,\u63a1DSSS,\u4e0d\u80fd\u548cGSM\u4e92\u9023,\u7f8e\u898f<\/p>\n\n\n\n


\u53c3\u8003cnet<\/p>\n\n\n\n

\u7db2\u8def\u985e\u578b<\/strong><\/td>\u6280\u8853\u540d\u7a31<\/strong><\/td>\u6db5\u84cb\u7bc4\u570d<\/strong><\/td>\u983b\u5bec<\/strong><\/td>\u4e0a\u7db2\u80fd\u529b<\/strong><\/td>\u79fb\u52d5\u80fd\u529b<\/strong><\/td><\/tr>
WPAN<\/strong><\/td>\u85cd\u82bd\u3001Wireless USB…<\/strong><\/td>\u5341\u516c\u5c3a\u5167<\/td>\u5404\u6280\u8853\u4e0d\u540c<\/td>\u9593\u63a5<\/td>\u7121<\/td><\/tr>
WLAN<\/strong><\/td>WiFi 802.11b<\/strong><\/td>\u6578\u5341\u516c\u5c3a<\/td>11M<\/td>\u9593\u63a5<\/td>\u6975\u4f4e<\/td><\/tr>
WiFi 802.11g<\/strong><\/td>54M<\/td><\/tr>
WiFi 802.11a<\/strong><\/td>54M<\/td><\/tr>
802.11n (MIMO)<\/strong><\/td>300M<\/td><\/tr>
WMAN<\/strong><\/td>WiMAX 802.16d<\/strong><\/td>\u6578\u5341\u516c\u91cc<\/td>70M<\/td>\u9593\u63a5<\/td>\u7121<\/td><\/tr>
WiMAX 802.16e<\/strong><\/td>70M<\/td>\u9ad8<\/td><\/tr>
WWAN<\/strong><\/td>GPRS(2.5G)<\/strong><\/td>\u6975\u5927<\/td>20~40K<\/td>\u76f4\u63a5<\/td>\u6975\u9ad8<\/td><\/tr>
WCDMA(3G)<\/strong><\/td>384K\/128K<\/td><\/tr>
CDMA2000(3G)<\/strong><\/td>153.6K\/153.6K<\/td><\/tr>
WCDMA+HSDPA(3.5G)<\/strong><\/td>14.4M\/384K<\/td><\/tr>
WCDMA+HSDPA
+HSUPA(3.75G)<\/strong><\/td>		\u4e0a\u884c5.76M<\/td><\/tr>
3G LTE<\/strong><\/td>100M\/50M<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

 <\/p>\n\n\n\n

………………………………………………………………………………

Twisted Pair Cable(\u96d9\u7d5e\u7dda):<\/strong>
\u5728ethernet\u7e9c\u7dda\u7684\u898f\u683c\u4e2d\u5c6c\u65bc10BaseT,…\u7b49
\u5169\u5c0d\u6216\u56db\u5c0d\u76f8\u4e92\u7e8f\u7e5e\u7684\u9285\u7dda\u7d44\u6210,\u6700\u9577\u8ddd\u96e2\u7d04100\u516c\u5c3a,\u50b3\u8f38\u578b\u614b\u70babase(\u57fa\u983b)
\u7e8f\u7e5e\u53ef\u63d0\u4f9bcancellation(\u627a\u92b7)\u8207differential signal(\u5dee\u52d5\u5f0f\u8a0a\u865f)\u4f86\u6ec5\u5c11\u96dc\u8a0a\u5f71\u97ff(ex:\u96fb\u78c1\u5e72\u64fe),\u907f\u514dcrosstalk
\u9023\u63a5\u5668\u548c\u63d2\u5ea7\u4f7f\u7528RJ-45,\u4e5f\u7a31iso8877
\u82e5\u5728\u4e0d\u540c\u5c0d\u7dda\u4e0a\u50b3\u8f38,\u53ef\u652f\u63f4\u5168\u96d9\u5de5<\/p>\n\n\n\n

\u63d0\u9ad8\u50b3\u8f38\u54c1\u8cea\u5efa\u8b70<\/strong>
\u7dda\u6750\u542b\u9285\u7387\u8981\u9ad8
\u7406\u60f3\u9577\u5ea6\u5efa\u8b70\u572850\u516c\u5c3a\u5167
\u907f\u958b\u5927\u96fb\u6e90
\u907f\u958b\u9ad8\u6eab\u74b0\u5883

\u96d9\u7d5e\u7dda\u5169\u7a2e\u578b\u614b\u70ba:
STP(Shielded Twisted Pair,\u5c4f\u853d\u96d9\u7d5e\u7dda)<\/strong>:\u6709\u4e00\u5c64\u5c0e\u96fb\u91d1\u5c6c\u819c\u5c07\u6bcf\u5c0d\u96d9\u7d5e\u7dda\u5305\u88f9\u8d77\u4f86,\u4e14\u9019\u56db\u5c0d\u53c8\u5728\u53e6\u5916\u5305\u8986\u4e00\u6b21,\u63d0\u4f9b\u66f4\u597d\u7684\u6297\u5e72\u64fe\u80fd\u529b
ScTP(screened twisted pair):\u4e5f\u7a31\u932b\u9251\u5c01\u96d9\u7d5e\u7dda,STP\u7684\u53e6\u4e00\u7a2e\u5f62\u5f0f,\u53ea\u6709\u7528\u91d1\u5c6c\u7b94\u5305\u8986\u9019\u56db\u5c0d\u96d9\u7d5e\u7dda
STP\u548cScTP\u9700\u63a5\u5730,\u8f03\u96e3\u5b89\u88dd,\u82e5\u5b89\u88dd\u932f\u8aa4\u5247\u5bb9\u6613\u53d7\u5e72\u64fe,\u4e14\u6210\u672c\u8f03\u9ad8
UTP(Unshielded Twisted Pair,\u975e\u5c4f\u853d\u96d9\u7d5e\u7dda)<\/strong>:\u6613\u53d7\u96dc\u8a0a\u7518\u64fe,\u50f9\u683c\u6700\u4f4e,\u4e0d\u9700\u63a5\u5730

(EIA)(TIA)(NEMA)\u7b49\u6a5f\u69cb\u7684UTP\u96d9\u7d5e\u7dda\u6a19\u6e96\u7b49\u7d1a
CATEGORY-1 1983\u5e74\u5ee3\u6cdb\u7528\u8001\u5f0f\u96fb\u8a71\u7dda,\u4e0d\u9069\u5408\u9ad8\u901f\u50b3\u8f38,\u4e3b\u8981\u7528\u65bc\u8a9e\u97f3\u50b3\u8f38
CATEGORY-2 4Mbps,\u50b3\u8f38\u983b\u73871mhz,\u7528\u65bc\u820a\u7684tokenring
CATEGORY-3 10Mbps 91m,\u50b3\u8f38\u983b\u738716mhz,LAN\u7db2\u7dda\u6700\u4f4e\u4f4e…\u7d1a\u4e86
CATEGORY-4 16Mbps 91m,\u50b3\u8f38\u983b\u738720mhz,Token Ring\u7db2\u8def\u7528\u6700\u4f4e\u7b49\u7d1a
CATEGORY-5 100Mbps 91m,\u50b3\u8f38\u983b\u7387100mhz,\u4e5f\u7a315\u865f\u7dda,\u901f\u5ea6\u548c\u6297\u5e72\u64fe\u512a,\u53ef\u7528\u5728FDDI\u7db2\u8def\u4e0a,1988
CATEGORY-5e 1000Mbps,\u53ef\u7528\u5728FDDI\u7db2\u8def,Gigabit Ethernet,\u548c5\u865f\u7dda\u50f9\u683c\u5dee\u4e0d\u591a
CATEGORY-6 1000Mbps\u53ef\u8d85\u904e,\u50b3\u8f38\u983b\u7387250mhz,\u53ef\u7528\u5728FDDI\u7db2\u8def,Gigabit Ethernet
CATEGORY-6a \u50b3\u8f38\u983b\u7387500mhz,\u53ef\u7528\u65bc10Gigabit Ethernet
CATEGORY-7 \u50b3\u8f38\u983b\u7387600mhz,\u7528\u65bc10Gigabit Ethernet
ps:cate\u8d8a\u9ad8\u7e8f\u7e5e\u7684\u5bc6\u5ea6\u8d8a\u9ad8,\u56e0\u6b64\u6210\u672c\u8d8a\u9ad8

RJ-45
\u67098\u689d\u984f\u8272\u7684\u7dda
\u5e36\u6709\u6b63\u6975\u7684\u96fb\u58d3\u6709\u5169\u5c0d,\u8996\u70batip(\u5c16\u7aef),t1-t4
\u5e36\u6709\u8ca0\u6975\u7684\u96fb\u58d3\u6709\u5169\u5c0d,\u7a31\u70baring(\u74b0),r1-r4
\u7531\u5de6\u800c\u53f3\u70ba:1\u767d\u6a58+2\u6a58 ,3\u767d\u7da0+4\u85cd ,5\u767d\u85cd+6\u7da0 ,7\u767d\u68d5+8\u68d5
\u7dda1\u50b3\u9001\u6b63\u96fb,\u7dda2\u50b3\u9001\u8ca0\u96fb,\u7dda3\u63a5\u6536\u6b63\u96fb,\u7dda6\u63a5\u6536\u8ca0\u96fb
\u5728fast ethernet\u4e2d:12\u7db2\u8def\u50b3\u9001\u7528,36\u7db2\u8def\u63a5\u6536\u7528,78\u96fb\u8a71\u7528,45\u4fdd\u7559
\u7531\u65bc\u50b3\u8f38\u8207\u63a5\u6536\u7528\u4e0d\u540c\u7684\u7dda,\u56e0\u6b64\u4e0d\u6703\u767c\u751f\u78b0\u649e,\u4e26\u80fd\u9806\u5229\u9032\u884cfull duplex\u50b3\u8f38
ps:gigabit ethernet\u4f7f\u75288\u689d\u7dda,Token Ring\u4f7f\u752836\u548c45

\u4f9d\u7dda\u7684\u6392\u5217\u4e0d\u540c\u5206\u70ba
straight-through(\u6a19\u6e96\u9023\u63a5\u7dda)<\/strong>,\u96d9\u7d5e\u7dda\u5169\u908a\u63a5\u982d\u7684\u7dda\u6750\u6392\u5217\u9806\u5e8f\u4e00\u6a23\u7684
ex:\u4e00\u7aef\u7684\u9806\u5e8f\u70ba\u6a19\u6e9612345678,\u53e6\u4e00\u7aef\u7684\u9806\u5e8f\u4e5f\u70ba\u6a19\u6e9612345678
\u4f7f\u7528\u6642\u6a5f:\u8a2d\u5099\u5169\u908a\u7684\u9023\u63a5\u57e0\u53ea\u6a19\u793a\u4e00\u500bx\u6642\u4f7f\u7528,\u50cf\u662fswitch\u5c0drouter\u6216pc\u6216server,hub\u5c0dpc\u6216server
crossover(\u8df3\u7dda)<\/strong>,\u4ea4\u932f\u67d0\u4e00\u96d9\u7d5e\u7dda\u4f7f\u7dda\u6027\u9023\u7dda\u7684\u8a2d\u5099\u4e0a\u53ef\u6b63\u78ba\u7684\u6392\u5217\u50b3\u53ca\u63a5\u6536\u8a0a\u865f
12\u8df336,\u9023\u63a5\u982d\u7684\u5176\u4e2d\u4e00\u7aef\u8981\u5c07\u539f\u4f861\u7684\u4f4d\u7f6e\u548c3\u5c0d\u8abf,\u53ca2\u7684\u4f4d\u7f6e\u8981\u548c6\u5c0d\u8abf
ex:\u4e00\u7aef\u7684\u9806\u5e8f\u70ba\u6a19\u6e9612345678,\u53e6\u4e00\u7aef\u7684\u9806\u5e8f\u9700\u6539\u70ba36145278
\u4f7f\u7528\u6642\u6a5f:\u8a2d\u5099\u5169\u908a\u7684\u9023\u63a5\u57e0\u90fd\u6a19\u793ax\u6642\u4f7f\u7528,\u50cf\u662f\u76f8\u540c\u8a2d\u5099\u4e92\u63a5,\u6216switch\u5c0dhub,router\u5c0dpc
rollover(\u5c0d\u63a5\u7dda)<\/strong>,\u4e5f\u7a31console\u7dda,\u5169\u7aef\u7684\u4f4d\u7f6e\u76f8\u53cd,\u4e14\u5176\u4e2d\u4e00\u7aef\u901a\u5e38\u53ef\u9023\u63a5pc\u7684com port
ex:\u4e00\u7aef\u7684\u9806\u5e8f\u70ba\u6a19\u6e9612345678,\u53e6\u4e00\u7aef\u7684\u9806\u5e8f\u9700\u6539\u70ba87654321
\u4f7f\u7528\u6642\u6a5f:cisco\u8a2d\u5099\u7684console port\u4f7f\u7528

………………………………………………………………..<\/p>\n\n\n\n

Coaxial Cable(\u540c\u8ef8\u96fb\u7e9c)
\u4e2d\u592e\u662f\u4e00\u689d\u88ab\u9694\u96e2\u5c64\u4fdd\u8b77\u8457\u7684\u9285\u5c0e\u82af,\u5176\u5916\u9694\u8457\u4e00\u5c64\u7d55\u7de3\u9ad4\u9084\u6709\u4e00\u5c64\u5c0e\u9ad4\u91d1\u5c6c\u7db2,\u5728\u6700\u5916\u5c64\u5247\u662f\u4fdd\u8b77\u5916\u76ae
4\u500b\u4e3b\u8981\u90e8\u90e8\u4efd\u7531\u5167\u800c\u5916\u70ba,\u9285\u88fd\u5c0e\u9ad4,\u5851\u81a0\u7d55\u7de3\u9ad4,\u7e8f\u7d72\u9285\u7dda\u906e\u853d,\u5916\u90e8\u8b77\u5957
\u6bd4\u96d9\u7d5e\u7dda\u66f4\u9ad8\u7684\u6297\u5e72\u64fe\u8981\u6c42,\u6700\u9ad8\u50b3\u8f3810Mbps,\u6700\u9577\u8ddd\u96e2\u7d04500\u5c3a,\u50b3\u8f38\u578b\u614b\u70babase(\u57fa\u983b),
\u5728\u540c\u4e00\u689d\u7dda\u4e0a\u50b3\u8f38,\u56e0\u6b64\u53ea\u652f\u63f4\u534a\u96d9\u5de5<\/p>\n\n\n\n

coaxial cable\u5206\u70ba:
RG-11<\/strong> \u4e5f\u7a31thicknet(\u7c97\u578b\u4e59\u592a\u7db2\u8def),\u5728ethernet\u7e9c\u7dda\u7684\u898f\u683c\u4e2d\u5c6c\u65bc10Base5
50\u6b50\u59c6 10Mbps 500\u7c73 \u539a0.4 \u82f1\u5bf8,\u9069\u5408LAN\u7528(RG-8,9\u4e5f\u53ef),\u9023\u63a5\u7528transceiver
MAU(medium attachment unit,\u5a92\u9ad4\u9644\u639b\u55ae\u5143)\u6216\u53eb(transceiver\u6536\u767c\u5668):\u63a5\u540c\u8ef8\u548caui\u7e9c\u7dda,\u540c\u5340\u6bb5\u542brepeater\u6700\u591a\u9023100\u53f0\u96fb\u8166
AUI(attachment unit interface)\u7e9c\u7dda,\u53c8\u7a31transceiver cable(\u6536\u767c\u5668\u7e9c\u7dda),\u5169\u7aef\u70badb-15\u63a5\u982d,\u63a5\u7d42\u7aef\u548c\u6536\u767c\u5668,\u6700\u957750\u5c3a
\u6536\u767c\u5668\u5206\u63a5\u982d,\u6216\u53ebvampire tap(\u5438\u8840\u9b3c\u63a5\u982d):\u54ac\u4f4f\u540c\u8ef8\u7684\u5206\u63a5\u982d
\u7e9c\u7dda\u7d42\u7aef\u5668\uff1a\u653e\u5728\u540c\u8ef8\u5169\u7aef
RG-58A\/U<\/strong> \u4e5f\u7a31thinnet(\u7d30\u578b\u4e59\u592a\u7db2\u8def),\u5728ethernet\u7e9c\u7dda\u7684\u898f\u683c\u4e2d\u5c6c\u65bc10Base2
50\u6b50\u59c6 10Mbps 200\u7c73(185m) \u539a0.18 \u82f1\u5bf8,\u9069\u5408LAN\u7528,\u9023\u63a5\u982d\u70baBNC\u63a5\u982d
BNC\u9023\u7dda
1\u7db2\u8def\u5169\u7aef\u4f7f\u752850\u6b50\u59c6\u7d42\u7aef\u96fb\u963b
2\u7db2\u7dda\u548c\u7db2\u5361\u4e4b\u9593\u8981\u7528T\u578b\u63a5\u982d
3\u7db2\u7dda\u6700\u77ed\u4e0d\u80fd\u5c11\u65bc 1 \u7c73
ps:bnc\u7db2\u6bb5\u6700\u591a\u53ea\u80fd\u63a530\u53f0\u96fb\u8166
RG-59\/U<\/strong> \u539a0.25\u82f1\u5bf8 75\u6b50\u59c6 \u7528\u5728Cable TV\u548cARCnet
RG-62\/U<\/strong> \u539a0.25\u82f1\u5bf8 \u7528\u5728ARCnet\u548cIBM\u7d42\u7aef\u4e0a<\/p>\n\n\n\n

Transceiver(\u6536\u767c\u5668)
Transmitter-Receiver\u6216drop cable(\u5f15\u7dda\u96fb\u7e9c)10base5\u7528
\u7528\u5728\u540c\u4e00\u500b\u7db2\u8def\u4e0a\u7684\u5169\u7a2e\u4e0d\u540c\u50b3\u8f38\u5a92\u4ecb\u7684\u9023\u63a5.
ex:\u4e00\u7aef\u7528COXIAL CABLE,\u53e6\u4e00\u7aef\u4f7f\u7528\u96d9\u7d5e\u7dda\u9023\u9032\u96fb\u8166<\/p>\n\n\n\n


……………………………………………………………………………………………………
Fiber Optic Cable(\u5149\u7e96\u7db2\u7dda) 155Mbps 4827m
\u6297\u5e72\u64fe\u80fd\u529b\u7279\u5f37,\u4e0d\u6703\u53d7EMI(\u96fb\u78c1\u5e72\u64fe)\u548cRFI(\u5c04\u983b\u5e72\u64fe)\u8f15\u4e14\u7d30,\u4e14\u50b3\u8f38\u91cf\u5927,\u8ddd\u96e2\u9060\u8a0a\u865f\u8870\u6e1b\u5c11,\u50b3\u9001\u9577\u8ddd\u96e2\u80fd\u4fdd\u6301\u6975\u4f73\u7684\u8a0a\u865f\u54c1\u8cea\u9ad8\u5b89\u5168,\u8f03\u96e3\u5206\u63a5\u7aca\u807d
\u6210\u672c\u9ad8,\u4f46\u5728\u9577\u8ddd\u96e2\u61c9\u7528\u7684\u6210\u672c\u6bd4\u9285\u88fd\u7e9c\u7dda\u4f4e\u8106\u5f31\u4f7f\u7528GBIC\u9023\u63a5\u901a\u5e38\u6709\u5169\u689d\u7dda\u5404\u8ca0\u8cac\u50b3\u8f38\u8207\u63a5\u6536,\u53ef\u652f\u63f4\u5168\u96d9\u5de5
FIBER\u901a\u5e38\u75315\u500b\u90e8\u4efd\u7d44\u6210:core(\u6838\u5fc3):\u7531\u77fd\u571f(\u4e8c\u6c27\u5316\u77fd)\u8207\u5176\u5b83\u6210\u4efd\u7d44\u6210\u7684\u73bb\u7483\u7e96\u7dadcladding(\u5305\u8986):\u570d\u7e5e\u5728\u6838\u5fc3\u5916,\u7531\u77fd\u571f\u88fd\u6210,\u7528\u4f86\u8b93\u5149\u7dad\u6301\u5728\u6838\u5fc3\u4e2dbuffer(\u7de9\u885d\u5668):\u570d\u7e5e\u5728\u5305\u8986\u5916,\u901a\u5e38\u70ba\u5851\u81a0,\u53ef\u4fdd\u8b77\u6838\u5fc3\u8207\u5305\u8986\u514d\u53d7\u50b7\u5bb3strengthening material(\u52a0\u5f37\u7269\u8cea):\u570d\u7e5e\u5728\u7de9\u885d\u5668\u5916,\u901a\u5e38\u70ba\u514b\u62c9\u7e96\u7dad,\u907f\u514d\u5728\u5b89\u88dd\u6642\u53d7\u5230\u62c9\u626fouter jacket(\u5916\u90e8\u8b77\u5957):\u5305\u570d\u8457\u7e9c\u7dda,\u4ee5\u4fdd\u8b77\u5149\u7e96\u7e9c\u7dda\u7684\u78e8\u640d\u8150\u8755\u8207\u5176\u5b83\u6c61\u67d3
\u5149\u5728\u73bb\u7483\u7e96\u7dad\u88e1\u50b3\u5c0e,\u5176\u5916\u7531\u4e00\u5c64cladding\u5916\u8863\u4fdd\u8b77\ufe50\u6574\u6839\u6216\u591a\u6839\u5c0e\u7dda\u9694\u8457\u4e00\u5c64\u7d55\u7de3\u6750\u6599\u88ab\u5305\u88f9\u5728\u5851\u81a0\u5916\u5957
\u5c0e\u5149\u662f\u5229\u7528core\u6298\u5c04\u7387\u5927\u65bccladding\u6298\u5c04\u7387
\u4f9d\u5bb9\u8a31\u5149\u5c04\u7dda\u6578\u91cf\u5206\u70ba:
multimode fiber(\u591a\u6a21\u5149\u7e96)<\/strong>:\u53ef\u591a\u500b\u5149\u5c04\u7dda\u5728\u5149\u7e96\u79fb\u52d5\u8a31\u591a\u4e0d\u540c\u7684\u5149\u7dda\u4ee5\u4e0d\u540c\u7684\u89d2\u5ea6\u884c\u9032,\u6bcf\u689d\u5149\u7dda\u88ab\u7a31\u505a\u6709\u4e0d\u540c\u6a21\u5f0f,\u8ef8\u5fc3\u76f4\u5f9150\u5fae\u7c73,\u8272\u6563\u8f03\u5927,\u4ee5led\u505a\u5149\u6e90,\u63a5\u982d\u985e\u578bSC
\u591a\u6a21\u68af\u968e\u6307\u6578\u5149\u7e96(Step-index Multimode Fiber)\uff1a\u6838\u5fc3\u5bc6\u5ea6\u56fa\u5b9a\uff0c\u6210\u672c\u8f03\u4f4e\uff0c\u4f46\u50b3\u9001\u8ddd\u96e2\u77ed(2\u516c\u91cc)\u4e14\u50b3\u9001\u901f\u7387\u4f4e(140Mbps)\u3002
\u591a\u6a21\u5e73\u6ed1\u6307\u6578\u5149\u7e96(Graded-index Multimode Fiber)\uff1a\u6838\u5fc3\u5bc6\u5ea6\u4e2d\u592e\u6700\u9ad8\u4e14\u9010\u6f38\u5f80\u5916\u905e\u6e1b\uff0c\u50b3\u9001\u8ddd\u96e2\u9577\u3002
ps:\u7dda\u901a\u5e38\u662f\u6a58\u8272
single-mode fiber(\u55ae\u6a21\u5149\u7e96)<\/strong>:\u53ea\u80fd\u4e00\u500b\u5149\u5c04\u7dda\u5728\u5149\u7e96\u79fb\u52d5\u5982\u540c\u5149\u6ce2\u5c0e\u7ba1\u4e14\u5149\u7dda\u53ea\u80fd\u76f4\u7dda\u524d\u9032,\u8ddd\u96e2\u9577\u53ef\u905430\u516c\u91cc,\u8ef8\u5fc3\u76f4\u5f918-10\u5fae\u7c73,\u8272\u6563\u8f03\u5c0f,\u4ee5\u96f7\u5c04\u505a\u5149\u6e90,\u63a5\u982d\u985e\u578bST
ps:\u7dda\u901a\u5e38\u662f\u9ec3\u8272<\/p>\n\n\n\n

\u5176\u4ed6\u76f8\u95dc\u540d\u8a5e
\u8272\u6563chromatic dispersion\uff1a\u9001\u81f3\u5149\u7e96\u7684\u5149\u8108\u885d\u5411\u5916\u64f4\u5c55
\u5149\u5b64\u5b50soliton:\u4f7f\u8272\u6563\u73fe\u8c61\u6d88\u5931\u7684\u8108\u885d
\u5149\u6e90\uff1a\u767c\u5149\u4e8c\u6975\u9ad4LED\u6216\u6ce8\u5165\u5f0f\u96fb\u5c04\u4e8c\u6975\u9ad4ILD<\/p>\n\n\n\n

GBIC(10\u5104\u4f4d\u5143\u7d44\u4ecb\u9762\u8f49\u63db\u5668)<\/strong>\u662f\u4e00\u500btransceiver(\u6536\u767c\u5668),\u4f5c\u70baethernet\u548c\u5149\u7e96\u7684\u4ecb\u9762\u53ef\u5c07\u4e32\u5217\u96fb\u6d41\u8f49\u63db\u6210\u5149\u5b78\u8a0a\u865f,\u6216\u5149\u5b78\u8a0a\u865f\u8f49\u63db\u6210\u6578\u4f4d\u96fb\u6d41\u7a2e\u985e\u5305\u62ec
\u30001000base-sx(\u77ed\u6ce2\u9577)
\u30001000base-lx\/lh(\u9577\u6ce2\u9577\/\u9577\u8ddd\u96e2)
\u30001000base-zx(\u5ef6\u4f38\u7684\u8ddd\u96e2)
\u53ef\u7528\u5728SC fiber-optic,RJ-45 UTP connectors<\/p>\n\n\n\n

SFP(small form factor pluggable)<\/strong>
GBIC\u7684\u5347\u7d1a\u7248\u672c,\u90e8\u4efd\u5ee0\u5546\u7a31SFP\u70baMINI-GBIC(\u5c0f\u578b\u5316GBIC)
\u6bd4GBIC\u5c0f\u4e00\u534a,\u529f\u80fd\u57fa\u672c\u4e0a\u548cGBIC\u76f8\u540c
\u53ef\u7528\u5728LC and MT-RJ fiber-optic,RJ-45 UTP connectors<\/p>\n\n\n\n

ps:
The fiber-based modules always have
the receive fiber on the left connector and the transmit fiber on the right connector,
as you face the connectors.<\/p>\n\n\n\n

\u5e38\u898bfiber\u63a5\u982d\u6709\u4ee5\u4e0b<\/strong>LC\u9023\u63a5switch\u4e0a\u7684SPF(mini GBIC)
SC\u9023\u63a5switch\u4e0a\u7684GBIC FC\u5e38\u7528\u65bcfiber\u7d42\u7aef\u76d2 ST\u5e38\u7528\u65bc\u9023\u63a5fiber\u914d\u7dda\u76e4<\/p>\n","protected":false},"excerpt":{"rendered":"

\u50b3\u8f38\u5a92\u9ad4\u4e09\u5927\u554f\u984c:attenuation(\u8a0a\u865f\u8870\u6e1b)\uff1a\u7531\u8a0a\u865f …<\/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-750","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\/750","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=750"}],"version-history":[{"count":0,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/posts\/750\/revisions"}],"wp:attachment":[{"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/media?parent=750"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/categories?post=750"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/tags?post=750"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}