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本帖最后由 超級狗 于 2017-10-12 13:35 编辑
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2.8 SFP+ POWER REQUIREMENT- ^4 O$ e; G( N/ K# D4 \8 b
SFP+ module maximum power consumption shall meet one of the following9 E: G! D4 L' t/ \
power classes:. U! k$ t* x G+ w0 C
• Power Level I modules – Up to 1.0 W- Q" R P: B2 t* h1 L
• Power Level II modules – Up to 1.5 W
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# I6 j! D( r4 f$ |To avoid exceeding system power supply limits and cooling capacity, all modules at power up by default shall operate with ≤1.0 W. Hosts supporting Power Level II operation may enable a Power Level II module through the 2-wire interface. Power Level II modules shall assert the power level declaration bit of SFF-8472.
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The maximum power level is allowed to exceed the classified power level for 500 ms following hot insertion or power up, or Power Level II authorization, however the current is limited to values given by Table 8 and illustrated in Figure 11.
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8 R; S4 S7 Q, Q' b" D% |8 q; rAt host power up the host shall supply VccT and VccR to the module within 100 ms of each other.
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簡單的來說，就是模組熱插入（Hot Insertion）或開機（Power Up）， VccT 和 VccR 500ms 內的功耗。3 ]. s& [8 P5 o
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模組依上述功耗，可以分為 Power Level 1 (< 1.0W) Module 和 Power Level 2 (< 1.5W) Module 兩個等級。9 G5 c' p8 N6 R5 o' @# I9 w
+ A3 b9 w- ?, P1 |參考下面兩個圖！
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发表于 2017-10-9 17:57
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发表于 2017-10-11 21:51
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