{"resolved":true,"match_type":"uuid","source_type":"original_book","book_id":"bbcce9bd-b637-4fa6-8a80-dadabab80104","title":"数字化生存 20周年纪念版","author":null,"edition":null,"publisher":null,"year":null,"isbn":"9787121307362","requested_by":"printed_page","book":{"source_type":"original_book","book_id":"bbcce9bd-b637-4fa6-8a80-dadabab80104","id":"bbcce9bd-b637-4fa6-8a80-dadabab80104","uuid":"bbcce9bd-b637-4fa6-8a80-dadabab80104","title":"数字化生存 20周年纪念版","normalized_title":"数字化生存20周年纪念版","author":null,"edition":null,"publisher":null,"year":null,"isbn":"9787121307362","isbns":["9787121307362"],"parsed":true,"ai_readable":true,"document_type":"book","page_count":362,"navigation_url":"https://workshop.closeclaw.top/ai/book/bbcce9bd-b637-4fa6-8a80-dadabab80104","title_url":"https://workshop.closeclaw.top/ai/title/%E6%95%B0%E5%AD%97%E5%8C%96%E7%94%9F%E5%AD%98%2020%E5%91%A8%E5%B9%B4%E7%BA%AA%E5%BF%B5%E7%89%88","fixed_page_url_template":"https://workshop.closeclaw.top/ai/book/bbcce9bd-b637-4fa6-8a80-dadabab80104/page/{printed_page}","path_api_url_template":"https://workshop.closeclaw.top/api/ai/book/bbcce9bd-b637-4fa6-8a80-dadabab80104/page/{printed_page}","read_url":"https://workshop.closeclaw.top/api/ai/read/bbcce9bd-b637-4fa6-8a80-dadabab80104","page_url":"https://workshop.closeclaw.top/api/ai/books/bbcce9bd-b637-4fa6-8a80-dadabab80104/page","search_url":"https://workshop.closeclaw.top/api/ai/books/bbcce9bd-b637-4fa6-8a80-dadabab80104/search"},"page":{"printed_page":173,"pdf_page":244,"physical_index":244,"physical_index_base":0,"printed_page_status":"recognized","page_sha256":"8d80f6067a5fb38c3c845cc5509d9740fe38b432e3813e223f4c6306257d809c"},"chapter":"20周年纪念版 数字化生存 一本影响千百万人的互联网启蒙经典著作","content":"比方说，有些同步卫星的经营者想要提供以陆地为基地的点对点网络服务。除非是你提供服务的地区正试图克服某些特别的地理或政治障碍，例如岛屿地形或新闻审查制度，否则和有线电话网络的优点相比较这样做没有多大意义。同样道理，如果要利用空中广播、有线电视或电话系统等路径把橄榄球超级杯赛的比特同时传送到每家每户，也是非常困难的事情。\n\n比特终究会慢慢地，在适当的时候，转移到适当的信道上。如果我想看去年的超级杯赛，利用电话拨号方式来收看，最合乎逻辑（而不是等着看哪家电视台会重播这场比赛)。赛完之后，超级杯赛一下子变成了档案材料，因此适合的播放信道也就和现场转播（“活”的资料）时截然不同。\n\n每一种传输信道都有自己的一些反常之处。当你利用卫星把信息从纽约传送到伦敦的时候，信息经过的距离只不过比从纽约用同样办法传到邻近的纽瓦克（Newark）多5英里。\n\n因此，只要位于某个卫星涵盖范围之内，不管你是从麦迪逊大街(Madison Avenue)打电话到同在纽约的公园大道还是远从纽约时代广场（TimeSquare）打电话到伦敦闹市区的皮克迪里广场（PicadillyCircus)，通话的费用应该相同。\n\n光纤同样迫使我们重新思考传输比特的费用问题。当我们用一条光缆干线在纽约和洛杉矶之间传输比特时，这种远距离的光缆传输比起用郊区如毛细血管般密布的电话网络传输来，究竟是更便宜，还是更昂贵，实在很难说。\n\nPart 3|数字化生活\n\n173","previous_page":172,"next_page":174}