滑铁卢华人, 水城百事论坛 http://www.kwcg.ca/forum/ 水城社区-Kitchener, Waterloo, Cambridge & Guelph华人的网上家园 en 闲的没事，别跟电过不去啊，哥们儿 Reply by 000, Sunday, May 02, 2010, 11:36:

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]]> http://www.kwcg.ca/forum/index.php?id=20365 http://www.kwcg.ca/forum/index.php?id=20365 Sun, 02 May 2010 11:36:17 GMT 000 考虑到线路的阻抗，拿起来电话后的电压各家都不同，你家离交换机房越远，测得的电压就越低，一般要求的机房覆盖距离是5km。远的10km也能用，干扰会大很多，电话机的标准阻抗是600欧姆。 Reply by vsh, Saturday, May 01, 2010, 22:28:

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]]> http://www.kwcg.ca/forum/index.php?id=20349 http://www.kwcg.ca/forum/index.php?id=20349 Sat, 01 May 2010 22:28:42 GMT vsh 谢谢了渔夫。研究了一下，原来是要拿起听筒后才从 -48V 降至 +8v - 18v 地:-D Reply by TaurusDad, Saturday, May 01, 2010, 22:22:

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]]> http://www.kwcg.ca/forum/index.php?id=20348 http://www.kwcg.ca/forum/index.php?id=20348 Sat, 01 May 2010 22:22:12 GMT TaurusDad 这是国际标准，国内也一样；准确的说是48V。 Reply by vsh, Saturday, May 01, 2010, 22:16:

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]]> http://www.kwcg.ca/forum/index.php?id=20346 http://www.kwcg.ca/forum/index.php?id=20346 Sat, 01 May 2010 22:16:49 GMT vsh 闲的无事，拿万用表一量电话线电压 居然是 46.8v. 各位有谁知道是否正常？好家伙，电话modem 过两天不都烧了？ 记得在国内都是 12v 一下的。 Posting by TaurusDad, Saturday, May 01, 2010, 22:13:

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]]> http://www.kwcg.ca/forum/index.php?id=20345 http://www.kwcg.ca/forum/index.php?id=20345 Sat, 01 May 2010 22:13:13 GMT TaurusDad