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    1. ??????????? ??????????????,?????????????????,?????????????????????,????????????

    2. ?????? ???????????????????????????????????????????????????,??????????"???????",??????????,???UPS???????????1.3?????????????????????????????????,??? ?????"???????",???????????

    3. ??????

    4. ??????

    5. ?????? PS????????????????????UPS????,?????????????,??????UPS???????????,???APC?BK500,???TG500;?????????,???APC?SmartUPS;??????????,???MGE?EXIDE???;???????????,???APC??DP300??UPS? ?????UPS???????????:1)????????;2)???????UPS??????;3)UPS?????????;4)??????????

    6. ??????

    7. UPS????

    8. UPS???? UPS???UPS???????????,?????UPS????????????????????????????2V,???AH?,?????100AH????10A????????10??????????????????,??UPS????12V100AH???????UPS??????????????,????3KVA???UPS??????96V?48V?8??4?12V????,5KVA??????????192V?16?12V?????UPS??????????????,??UPS????????90%??,?90%?,??8?12V100AH?????3KVAUPS??????2KW????????: 8*12*100890%/2000=4.32(H) ?????????4.32?????????????????,??????????????????????,????????????????4???

    9. ?????????UPS?? ????????,??????????????????????,????????(?????),?????????,??????;????????,????????????????????,??UPS????????,??UPS?????,?UPS????<10%?,???????UPS???,?????????,?????????????PC??????????????????,?????????

    10. ?????????????,??????????????????????????????,????????UPS?????????(????),???????,????????????????????????????

    11. ?????????,????????,?????????????,?????????????????????????,???????????????????,???????????????????,??????????,????????????????????????220V±10%?????????????????

    12. ????????????????????,?????????????,???????????????,???????????????????,????????????,???????

    13. ???????UPS,??????5???,??????????UPS?????????1????????,??????????????????????,???????????????????????????????????????????,?????????UPS????????,?UPS??????????

    14. (1).????????????????? (2).???????UPS????????????

    15. ??????????? ?????????????????????,????????????,??????(??)????????????,?????????????????????,???????????????????????? ??????????????????????????????????,?????????????????????

    16. ?????? ????????????,?????????????,????????????????????????????????????????,????????,??????????????????????????????????????????????«???????????»(GB50174-93),??????????????????????????????????????,?????????????????????

    17. ???????

    18. ??????

    19. ??????

    20. ?????? 1)????????????:2?,4?,25??(?2??????,4????????,25?????????????) 2)??????????:?????(STP)???????(UTP)???? 3)??????????:3?,4?,5???5????????????????????????????????????3????

    21. ?????? ???????????,???????????????????????????????????????????????? (1)??:??(Attenuation)???????????????????????,???????,?????????????"db"???,??????????????????????????????,??,??????????????????? (2)????:????????????(FEXT),????????NEXT,????????,??FEXT?????????????(NEXT)?????? ?UTP????????????????????UTP??,NEXT??????????,???????????????????????,??? ???????????????

    22. ?????? ????(Single-mode Fiber):???????????,?????????;??????? ????(Multi-mode Fiber):???????????,????????,?????????????;???????

    23. ???????????????????,????????????????????,?????????????????? ??????,???????????(?? ???),???????????(????),???????????? ???????????????,??????????????? ???????????????????????,??????????????

    24. ?????? SFP: Small Form Factor Pluggable SFF: Small Form Factor XFP: 10 Gigabit Small Form Factor Pluggable MU: Miniature Unit LC: Lucent Connector SC: Subscriber Connector FC: Fiber Connector MTRJ: ‘MT’ ferrule, Register Jack latch ST: Straight Tip

    28. ???? fluke networks???dsp-4000 series lan cableanalyzers????????(?????“???”)???????,???????????(lan)???????????????????????????????????,??????????????????????????????????????350mhz??????

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