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3.5.4Data ports for additional equipment
+ |, ^6 w* e, `& s* ZTo 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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; D0 a6 L% B2 e3 O6 M% P8 X5 RNOTEIt 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.* A$ ^, e$ l+ o5 ]
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Compliance is checked byinspection and,if necessary, bytest. . Q8 ?) e- l7 j( }
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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, C; v K5 T7 l* R% o
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;
* J0 u, A9 ^2 O+ ]) c& r0 KB. 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。
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