老四 发表于 2011-8-17 16:03:23

NOTE 1 关注过吗？

好多产品标准和测试方法里 N多note 很少被关注 大家觉得很有用的都晒晒
（怎么感觉像广告 请关注小字部分呵呵）

NOTE 1: Outdoor lines carrying DC power with superimposed signals shall be treated as outdoor signal lines.
NOTE 2: For switching equipment which is intended to be installed in locations other than telecommunication centres, the requirements for immunity to surges on outdoor signal
lines and to continuous conducted disturbances on signal lines are according to the requirements for telecommunication centres. This reduction is based - amongst other
things - upon the screening effect of multi-pair cables and specific earthing/bonding techniques in use for switching equipment.

孔今 发表于 2011-8-17 20:39:04

NOTE1：应该是说既传信号又传电源的线要被视为信号线。

这种线常见于射频线，既传电源又传射频信号。

老四 发表于 2011-8-18 09:08:53

学习了多谢
哎我的英文啊

haihun 发表于 2011-8-18 09:28:01

象POE网口、供电的ISDN等端口都是这种情况

老四 发表于 2011-8-18 09:57:34

象POE网口、供电的ISDN等端口都是这种情况
haihun 发表于 2011-8-18 09:28 http://bbs.emcbest.com/images/common/back.gif

更加了然 解

3ks！

孔今 发表于 2011-8-18 21:38:02

回复 4# haihun

楼主说的对，赞。
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