çæ§æå头ä¸æçµæºï¼éç¨éè¿ç½çº¿
POEä¾çµçæ¹å¼ä¹å¯ä»¥æ£å¸¸å·¥ä½ï¼åææ¯æå头æ¯æPOEä¾çµï¼äº¤æ¢æºæ¯æPOEä¾çµã
POE (Power Over Ethernet)æçæ¯å¨ç°æç
以太ç½Cat.5å¸çº¿åºç¡æ¶æä¸ä½ä»»ä½æ¹å¨çæ
åµä¸ï¼å¨ä¸ºä¸äºåºäºIPçç»ç«¯ï¼å¦
IPçµè¯æºã
æ 线å±åç½æ¥å
¥ç¹APãç½ç»æåæºçï¼ä¼ è¾æ°æ®ä¿¡å·çåæ¶ï¼è¿è½ä¸ºæ¤ç±»è®¾å¤æä¾ç´æµä¾çµçææ¯ã POEä¹è¢«ç§°ä¸ºåºäºå±åç½çä¾çµç³»ç»(POL, Power over LAN )æææºä»¥å¤ªç½( Active Ethernet)ï¼ææ¶ä¹è¢«ç®ç§°ä¸ºä»¥å¤ªç½ä¾çµï¼è¿æ¯å©ç¨ç°åæ å以太ç½ä¼ è¾çµç¼çåæ¶ä¼ éæ°æ®å
çµåççææ°æ åè§èï¼å¹¶ä¿æäºä¸ç°å以太ç½ç³»ç»åç¨æ·çå
¼å®¹æ§ã
POEçç³»ç»ææï¼
ä¸ä¸ªå®æ´çPOEç³»ç»å
æ¬ä¾çµç«¯è®¾å¤(PSE, Power Sourcing Equipment)ååçµç«¯è®¾å¤(PD, Powered Device)两é¨åãPSE设å¤æ¯ä¸ºä»¥å¤ªç½å®¢æ·ç«¯è®¾å¤ä¾çµç设å¤,åæ¶ä¹æ¯æ´ä¸ªPOE以太ç½ä¾çµè¿ç¨ç管çè
ãèPD设å¤æ¯æ¥åä¾çµçPSEè´è½½,å³POEç³»ç»ç客æ·ç«¯è®¾å¤,å¦IPçµè¯ã
ç½ç»å®å
¨æåæºãAPå
æä¸çµè( PDA)æ移å¨çµè¯å
çµå¨ç许å¤å
¶ä»ä»¥å¤ªç½è®¾å¤ï¼å®é
ä¸,ä»»ä½åçä¸è¶
è¿13Wç设å¤é½å¯ä»¥ä»RJ45æ座è·åç¸åºççµåï¼ã两è
åºäºIEEE 802.3afæ å建ç«æå
³åçµç«¯è®¾å¤PDçè¿æ¥æ
åµã设å¤ç±»åãåè级å«çæ¹é¢çä¿¡æ¯èç³»,并以æ¤ä¸ºæ ¹æ®PSEéè¿ä»¥å¤ªç½åPDä¾çµã