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3.5.4Data ports for additional equipment t/ v6 J" i( _
To limit the risk of fire in an additional equipment or accessory (for example, a scanner, mouse, keyboard, DVD drive, CD ROM drive orjoystick), SELV CIRCUITS of a data port for connection of such equipment shall be supplied by a limited power source that complies with2.5.This requirementdoes not apply if it is known that the additional equipment complieswith 4.7.
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NOTEIt is recommended that manufacturers of accessories and their INTERCONNECTING CABLES include protectionagainst faultcurrents up to 8A at 100VA, the maximum available from a limitedpower sourcein compliancewith Table 2B.
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Compliance is checked byinspection and,if necessary, bytest. ' }2 J# w* g$ W& `' j! I$ |
/ n/ y- t) |6 m7 {在60950里关于dataport的这段描述要求,他到底说明的是什么呢?以一个三类设备由LPS电源供电,设备上有dataport,如USB端口这样的情形为例+ v+ |1 Z8 R& M$ x
A. 根据3.5.4的条款,只要前端LPS供电了,那连接到这样dataport的附件就不需要防火外壳,这里是不是就可以理解为这样的dataport满足了LPS,不再需要评估它了。或者理解为以下;
/ R ?4 @1 D2 l, w1 p, EB. 为了防止附件的防火危险,dataport必须满足LPS,那么不管前端是不是LPS供电,dataport都是需要评估的。/ W @' _. ]* p6 W! W% J
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