{"id":3887,"date":"2021-04-30T10:22:50","date_gmt":"2021-04-30T02:22:50","guid":{"rendered":"http:\/\/www.comtest.cn\/?p=3887"},"modified":"2021-06-29T10:39:41","modified_gmt":"2021-06-29T02:39:41","slug":"%e6%97%a0%e7%ba%bf%e7%bd%91%e7%bb%9c%e7%9a%84%e5%ae%9a%e6%97%b6%e5%92%8c%e5%90%8c%e6%ad%a5%e6%a0%87%e5%87%86","status":"publish","type":"post","link":"http:\/\/www.comtest.com.cn\/?p=3887","title":{"rendered":"\u65e0\u7ebf\u7f51\u7edc\u7684\u5b9a\u65f6\u548c\u540c\u6b65\u6807\u51c6"},"content":{"rendered":"<p>\u4f5c\u8005\uff1aReza Vaez-Ghaemi \u535a\u58eb VIAVI Solutions \u4ea7\u54c1\u7ebf\u7ba1\u7406\u9ad8\u7ea7\u7ecf\u7406<\/p><p>\u591a\u5e74\u4ee5\u6765\uff0c\u540c\u6b65\u7f51\u7edc\u4e00\u76f4\u662f\u65e0\u7ebf\u7f51\u7edc\u7684\u5173\u952e\u7ec4\u6210\u90e8\u5206\u3002\u9ad8\u7ea7 LTE \u670d\u52a1\u548c 5G \u670d\u52a1\u7684\u5f15\u5165\u5bf9\u540c\u6b65\u7f51\u7edc\u63d0\u51fa\u4e86\u65b0\u7684\u8981\u6c42\u3002\u672c\u767d\u76ae\u4e66\u63cf\u8ff0\u4e86\u540c\u6b65\u8981\u6c42\u3001 \u6280\u672f\u4ee5\u53ca\u540c\u6b65\u6807\u51c6\u548c\u6d4b\u8bd5\u4e0e\u6d4b\u91cf\u5e94\u7528\u3002\u672c\u6587\u6700\u540e\u63cf\u8ff0\u4e86\u65e0\u7ebf\u7f51\u7edc\u4e2d\u540c\u6b65\u7684 ITU G.826x\/G.827x \u6807\u51c6\uff0c\u5e76\u91cd\u70b9\u4ecb\u7ecd\u4e86\u4e0e\u73b0\u573a\u5e94\u7528\u90e8\u7f72\u76f8\u5173\u7684\u4e00\u4e9b\u4e3b\u8981\u6307\u6807\u548c\u7f51\u7edc\u9650\u5236\u3002<\/p><h1 class=\"wp-block-heading\">\u7b80\u4ecb<\/h1><p>\u540c\u6b65\u7f51\u7edc\u5df2\u7ecf\u5728\u7535\u4fe1\u7f51\u7edc\u4e2d\u90e8\u7f72\u591a\u5e74\u3002\u540c\u6b65\u6570\u5b57\u4f53\u7cfb (SDH)\/\u540c\u6b65\u5149\u7f51\u7edc (SONET) \u4ee3\u8868\u5e76\u4ecd\u7136\u6784\u6210\u5927\u91cf\u57ce\u57df\u6838\u5fc3\u7f51\u7684\u5173\u952e\u7ec4\u6210\u90e8\u5206\u3002\u63a5\u5165\u7f51\u90e8\u7f72\u4e86 PDH\/DS1\/DS3 \u548c SONET\/SDH \u670d\u52a1\uff0c\u4ee5\u540c\u6b65\u5ba2\u6237\u7aef\u7684\u7ec8\u7aef\u5e94\u7528\u3002\u968f\u7740\u7535\u4fe1\u7ea7\u4ee5\u592a\u7f51\u7684\u5f15\u5165\uff0c\u8fc7\u53bb\u5341\u5e74\u4e2d\u5f15\u5165\u4e86\u57fa\u4e8e\u5206\u7ec4\u7684\u5b9a\u65f6\u548c\u540c\u6b65\u7684\u65b0\u6807\u51c6\u3002<\/p><p>\u51e0\u5341\u5e74\u524d\u5c31\u51fa\u73b0\u4e86\u5bf9\u540c\u6b65\u7684\u9700\u6c42\uff0c\u5f53\u65f6\u7535\u4fe1\u7f51\u7edc\u5f15\u5165\u4e86\u6570\u5b57\u4ea4\u6362\u548c\u4f20\u8f93\u3002\u8fd9\u4e9b\u6280\u672f\u9700\u8981\u540c\u6b65\u53d1\u5c04\u673a\u548c\u63a5\u6536\u673a\uff1b\u66f4\u5177\u4f53\u5730\u8bf4\uff0c\u9700\u8981\u63a5\u6536\u673a\u65f6\u949f\u6765\u8ddf\u8e2a\u53d1\u5c04\u673a\u4fe1\u53f7\u3002\u6b63\u786e\u7684\u8ddf\u8e2a\u80fd\u591f\u6b63\u786e\u5730\u68c0\u7d22\u4f20\u8f93\u7684\u4fe1\u53f7\uff1b\u53e6\u4e00\u65b9\u9762\uff0c\u4e0d\u826f\u7684\u540c\u6b65\u4f1a\u5bfc\u81f4\u4f20\u8f93\u8d28\u91cf\u4e0b\u964d\uff0c\u4ece\u800c\u5f71\u54cd\u8bed\u97f3\u6216\u6570\u636e\u7b49\u4f20\u8f93\u670d\u52a1\u7684\u8d28\u91cf\u3002<\/p><p>\u5728\u7406\u60f3\u7684\u4f20\u8f93\u7cfb\u7edf\u4e2d\uff0c\u8109\u51b2\u4ee5\u7cbe\u786e\u7684\u95f4\u9694\u4f20\u8f93\uff0c\u5e76\u4ee5\u5b8c\u5168\u76f8\u540c\u7684\u65f6\u95f4\u95f4\u9694\u5230\u8fbe\u63a5\u6536\u5668\u3002\u5728\u5b9e\u9645\u7cfb\u7edf\u4e2d\uff0c\u5404\u79cd\u56e0\u7d20\u90fd\u4f1a\u5bfc\u81f4\u4fe1\u53f7\u7f3a\u9677\uff0c\u4ece\u800c\u4f7f\u5f97\u9891\u7387\u6216\u76f8\u4f4d\u540c\u6b65\u4e0d\u4f73\u3002\u9891\u7387\u540c\u6b65\u4e5f\u79f0\u4e3a\u8c10\u632f\uff0c\u662f\u6307\u65f6\u949f\u4e0e\u76f8\u540c\u9891\u7387\u5bf9\u9f50\uff08\u56fe 1\uff09\u3002\u7c7b\u4f3c\u5730\uff0c\u76f8\u4f4d\/\u65f6\u95f4\u540c\u6b65\u662f\u6307\u5c06\u4e24\u4e2a\u8bbe\u5907\u5206\u522b\u5bf9\u51c6\u540c\u4e00\u4e2a\u76f8\u4f4d\uff08\u56fe 2\uff09\u548c\u4e00\u5929\u4e2d\u7684\u65f6\u95f4\uff08\u56fe 3\uff09\u3002<\/p><div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><a href=\"http:\/\/www.comtest.cn\/wp-content\/uploads\/2021\/04\/02_960768.jpg\"><img fetchpriority=\"high\" decoding=\"async\" width=\"700\" height=\"263\" src=\"http:\/\/www.comtest.cn\/wp-content\/uploads\/2021\/04\/02_960768.jpg\" alt=\"\" class=\"wp-image-3889\" srcset=\"http:\/\/www.comtest.com.cn\/wp-content\/uploads\/2021\/04\/02_960768.jpg 700w, http:\/\/www.comtest.com.cn\/wp-content\/uploads\/2021\/04\/02_960768-300x113.jpg 300w, http:\/\/www.comtest.com.cn\/wp-content\/uploads\/2021\/04\/02_960768-600x225.jpg 600w, http:\/\/www.comtest.com.cn\/wp-content\/uploads\/2021\/04\/02_960768-64x24.jpg 64w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/a><\/figure><\/div><div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><a href=\"http:\/\/www.comtest.cn\/wp-content\/uploads\/2021\/04\/03_400.jpg\"><img decoding=\"async\" width=\"400\" height=\"310\" src=\"http:\/\/www.comtest.cn\/wp-content\/uploads\/2021\/04\/03_400.jpg\" alt=\"\" class=\"wp-image-3890\" srcset=\"http:\/\/www.comtest.com.cn\/wp-content\/uploads\/2021\/04\/03_400.jpg 400w, http:\/\/www.comtest.com.cn\/wp-content\/uploads\/2021\/04\/03_400-300x233.jpg 300w, http:\/\/www.comtest.com.cn\/wp-content\/uploads\/2021\/04\/03_400-64x50.jpg 64w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><\/a><\/figure><\/div><p>\u6709\u7f3a\u9677\u7684\u540c\u6b65\u4f1a\u5bfc\u81f4\u6296\u52a8\u6216\u6f02\u79fb\u3002\u6296\u52a8\u548c\u6f02\u79fb\u8868\u5f81\u4e86\u53d1\u5c04\u4fe1\u53f7\u7684\u76f8\u4f4d\u504f\u5dee\u3002\u6f02\u79fb\u901a\u5e38\u662f\u7531\u5bfc\u81f4\u7f13\u6162\u76f8\u4f4d\u53d8\u5316\u7684\u73b0\u8c61\uff08\u5982\u6e29\u5ea6\u53d8\u5316\uff09\u5f15\u8d77\u7684\u3002\u6296\u52a8\u53ef\u80fd\u662f\u65f6\u949f\u7535\u8def\u5de5\u4f5c\u7684\u7ed3\u679c\u3002<\/p><p>ANSI T1.101 \u4e2d\u89c4\u5b9a\u4e86\u65f6\u949f\u6027\u80fd\uff0c\u4ece\u7b2c 1 \u5c42\u5230\u7b2c 4 \u5c42\u5206\u4e3a\u4e94\u7c7b\uff08\u8868 1\uff09\u3002\u6700\u9ad8\u7684\u6027\u80fd\u662fStratum 1\u3002\u5b83\u4e5f\u79f0\u4e3a\u4e3b\u8981\u53c2\u8003\u6e90 (PRS) \u6216\u4e3b\u8981\u53c2\u8003\u65f6\u949f (PRC)\uff0c\u5c3d\u7ba1\u5b83\u4eec\u4e4b\u95f4\u6709\u6240\u4e0d\u540c\u3002\u4e0e\u7b2c 1 \u5c42\u65f6\u949f\u4e0d\u540c\uff0cPRS \u4e0d\u9700\u8981\u662f\u81ea\u4e3b\u7684\u3002PRS \u5fc5\u987b\u53ef\u8ffd\u6eaf\u5230Stratum 1\u3002\u4f8b\u5982\uff0c\u5b83\u53ef\u4ee5\u57fa\u4e8e\u6ee1\u8db3Stratum 1\u53ef\u8ffd\u6eaf\u6027\u8981\u6c42\u7684 GPS\uff0c\u4f46\u5b83\u4e0d\u662f\u81ea\u4e3b\u7684\u3002\u94ef\u539f\u5b50\u949f\u662f\u7535\u4fe1\u4e2d\u4f7f\u7528\u7684\u81ea\u4e3b\u65f6\u949f\u3002<\/p><figure class=\"wp-block-table\"><table><tbody><tr><td><strong>\u5c42\u7ea7<\/strong><\/td><td><strong>\u7cbe\u5ea6<\/strong><\/td><\/tr><tr><td>1<\/td><td>1&#215;10<sup>-11<\/sup><\/td><\/tr><tr><td>2<\/td><td>1.6&#215;10<sup>-8<\/sup><\/td><\/tr><tr><td>3\/3E<\/td><td>4.6&#215;10<sup>-6<\/sup><\/td><\/tr><tr><td>4<\/td><td>32&#215;10<sup>-6<\/sup><\/td><\/tr><\/tbody><\/table><\/figure><div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><a href=\"http:\/\/www.comtest.cn\/wp-content\/uploads\/2021\/04\/04_500.jpg\"><img decoding=\"async\" width=\"500\" height=\"343\" src=\"http:\/\/www.comtest.cn\/wp-content\/uploads\/2021\/04\/04_500.jpg\" alt=\"\" class=\"wp-image-3891\" srcset=\"http:\/\/www.comtest.com.cn\/wp-content\/uploads\/2021\/04\/04_500.jpg 500w, http:\/\/www.comtest.com.cn\/wp-content\/uploads\/2021\/04\/04_500-300x206.jpg 300w, http:\/\/www.comtest.com.cn\/wp-content\/uploads\/2021\/04\/04_500-64x44.jpg 64w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><\/a><\/figure><\/div><p>\u5178\u578b\u7684\u7535\u4fe1\u7f51\u7edc\u4e3a\u5404\u4e2a\u8282\u70b9\u90e8\u7f72\u4e00\u4e2a\u6216\u591a\u4e2a PRS \u5b9a\u65f6\u57fa\u51c6\u3002\u7531\u4e8e\u5728\u6bcf\u4e2a\u8282\u70b9\u90e8\u7f72 PRS \u5e76\u4e0d\u7ecf\u6d4e\uff0c\u56e0\u6b64\u9700\u8981\u4e00\u79cd\u540c\u6b65\u65b9\u6cd5\u6765\u4e3a\u5404\u4e2a\u5e94\u7528\u63d0\u4f9b\u6700\u4f4e\u7684\u540c\u6b65\u6027\u80fd\uff1b\u4f8b\u5982\u5728\u57fa\u7ad9\u5904\u7684Stratum 3E\u3002\u4e3b\u6d41\u65b9\u6cd5\u662f\u4e3b\u4ece\u65b9\u6cd5\uff08\u56fe 5\uff09\uff0c\u5176\u4e2d PRS \u540c\u6b65\u4e0b\u6e38\u7684\u4e00\u7cfb\u5217\u8282\u70b9\u3002\u4e3a\u4e86\u63d0\u4f9b\u5197\u4f59\uff0c\u9700\u8981\u7b2c\u4e8c\u4e2a\u4e3b\u673a\u3002SONET\/SDH \u7f51\u7edc\u90e8\u7f72\u540c\u6b65\u4f9b\u7ed9\u5355\u5143 (SSU) \u6216\u901a\u4fe1\u697c\u7efc\u5408\u5b9a\u65f6\u6e90 (BITS)\uff0c\u4ee5\u63a5\u53d7\u66ff\u4ee3\u540c\u6b65\u6e90\u5e76\u9009\u62e9\u6700\u4f73\u53ef\u7528\u6e90\u3002\u5728 PRS \u548c SSU \u4e4b\u95f4\uff0cSONET\/SDH \u7f51\u7edc\u4f7f\u7528 SONET\/SDH \u8bbe\u5907\u65f6\u949f (SEC) \u5c06\u65f6\u949f\u4ece\u4e0a\u6e38\u8282\u70b9\u4e0b\u53d1\u5230\u4e0b\u6e38\u8282\u70b9\u3002<\/p><p>\u53ea\u8981\u8bbe\u5907\u65f6\u949f\u8fde\u63a5\u5230\u5b83\u4eec\u5404\u81ea\u7684\u65f6\u949f\uff0c\u5b83\u4eec\u7684\u540c\u6b65\u6027\u80fd\u5c06\u7531\u57fa\u51c6\u65f6\u949f\uff08\u4f8b\u5982 PRC\uff09\u5b9a\u4e49\u3002\u7136\u800c\uff0c\u5982\u679c\u5b83\u4eec\u5931\u53bb\u540c\u6b65\u6e90\uff0c\u5b83\u4eec\u7684\u7a33\u5b9a\u6027\u5c06\u53d6\u51b3\u4e8e\u5185\u90e8\u65f6\u949f\u7684\u6027\u80fd\u3002\u5728\u57fa\u51c6\u4e8b\u4ef6\u4e22\u5931\u540e\u7684\u6709\u9650\u65f6\u95f4\u5185\uff0c\u8bbe\u5907\u53ef\u4ee5\u4f9d\u9760\u5176\u4fdd\u6301\u529f\u80fd\u6765\u9650\u5236\u76f8\u5bf9\u4e8e\u57fa\u51c6\u7684\u6f02\u79fb\u7a0b\u5ea6\u3002\u4fdd\u6301\u529f\u80fd\u4f7f\u7528\u4fdd\u6301\u524d\u7684\u5386\u53f2\u6570\u636e\u6765\u63a7\u5236\u5176\u5185\u90e8\u632f\u8361\u5668\u3002\u9664\u4e86\u4fdd\u6301\u7b97\u6cd5\u548c\u6570\u636e\uff0c\u5185\u90e8\u632f\u8361\u5668\u7684\u9009\u62e9\u5bf9\u4e8e\u4fdd\u6301\u826f\u597d\u7684\u7a33\u5b9a\u6027\u4e5f\u81f3\u5173\u91cd\u8981\u3002\u8010\u70ed\u6676\u4f53\u632f\u8361\u5668\u5e7f\u6cdb\u7528\u4e8e\u540c\u6b65\u5e94\u7528\uff0c\u652f\u6301 SEC \u548c\u5176\u4ed6stratum 3\/3E\u7528\u4f8b\u7684\u4e00\u7cfb\u5217\u7a33\u5b9a\u6027\u8981\u6c42\u3002\u94f7\u632f\u8361\u5668\u5177\u6709\u66f4\u597d\u7684\u7a33\u5b9a\u6027\uff0c\u901a\u5e38\u7528\u4e8e SSU\/BITS \u8bbe\u5907\uff0c\u800c\u4e14\u7406\u6240\u5f53\u7136\u7684\uff0c\u5b83\u4eec\u4e5f\u66f4\u8d35\u3002PRC\/PRS \u548c SSU\/BITS \u901a\u5e38\u4f5c\u4e3a\u72ec\u7acb\u8bbe\u5907\u751f\u4ea7\uff1bSEC\/SMC \u66f4\u666e\u904d\u5730\u88ab\u96c6\u6210\u4e3a\u7f51\u5143\u7684\u4e00\u90e8\u5206\uff0c\u4f8b\u5982 SONET\/SDH \u6216\u540c\u6b65\u4ee5\u592a\u7f51\u8282\u70b9\u3002<\/p><p>\u4e3a\u4e86\u533a\u5206\u548c\u9009\u62e9\u9002\u5408\u5e94\u7528\u7684\u540c\u6b65\u89e3\u51b3\u65b9\u6848\uff0c\u9700\u8981\u8003\u8651\u51e0\u4e2a\u56e0\u7d20\u3002\u8fd9\u4e9b\u56e0\u7d20\u5305\u62ec\u957f\u671f\u51c6\u786e\u6027\u548c\u77ed\u671f\u7a33\u5b9a\u6027\u3002\u524d\u8005\u662f\u901a\u8fc7\u4f7f\u7528 GPS \u63a5\u6536\u5668\u6765\u4fdd\u8bc1\u7684\uff0c\u8be5\u63a5\u6536\u5668\u6700\u7ec8\u53ef\u8ffd\u6eaf\u5230\u4e16\u754c\u534f\u8c03\u65f6 (UTC)\u3002\u7136\u800c\uff0cGPS \u63a5\u6536\u5668\u53ef\u80fd\u65e0\u6cd5\u6ee1\u8db3\u77ed\u671f\u7a33\u5b9a\u6027\u8981\u6c42\u3002\u56e0\u6b64\uff0c\u540c\u6b65\u89e3\u51b3\u65b9\u6848\u901a\u5e38\u4f9d\u8d56\u4e8e\u67d0\u79cd\u5177\u6709\u5404\u79cd\u6210\u672c\/\u6027\u80fd\u53c2\u6570\u7684\u7cbe\u5bc6\u77f3\u82f1\u632f\u8361\u5668\u3002<\/p><p>\u5168\u90e8\u5185\u5bb9\u6982\u8981<\/p><ul class=\"wp-block-list\"><li>\u7b80\u4ecb<\/li><li>\u65f6\u95f4\u8bef\u5dee\u3001\u6296\u52a8\u548c\u6f02\u79fb\u6d4b\u91cf<\/li><li>\u65e0\u7ebf\u540c\u6b65\u8981\u6c42<\/li><li>\u57fa\u4e8e\u5206\u7ec4\u7684\u540c\u6b65\u6807\u51c6<\/li><li>IEEE 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