adsl宽带与光纤宽带有什么不同（What is the difference between ADSL broadband and fiber broadband）.docVIP

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adsl宽带与光纤宽带有什么不同（What is the difference between ADSL broadband and fiber broadband）.doc

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adsl宽带与光纤宽带有什么不同（What is the difference between ADSL broadband and fiber broadband）

adsl宽带与光纤宽带有什么不同（What is the difference between ADSL broadband and fiber broadband） What is the maximum continuous operating voltage of Uc? Regardless of the type of SPD design can only limit transient overvoltage, this is because SPD allows limited energy, transient overvoltage peak is very high, but the duration is very short (microseconds to milliseconds), energy is limited, the probability is small. In the grid and transient overvoltage caused by the power grid, it runs its abnormal or fault, although its amplitude is transient over voltage is low, but the duration is longer than the transient overvoltage (a few cycles to a few seconds, or even longer), so energy, SPD can not afford: For metal oxides, resistors and other voltage limiting type, light accelerated aging, heavy overheating until damage, short-circuit, explosion; The gap voltage switch type, but no problem of aging, such as transient voltage breakdown and can not automatically extinguish arc breakdown after, will explode. Transient voltage UT (5S) on the grid and the maximum continuous operating voltage Ucs. The maximum continuous operating voltage SPD allowed by the Uc shall be greater than the maximum continuous operating voltage Ucs of the grid. Uc gain too low, light to accelerate the aging of SPD, heavy cause SPD explosion. Therefore, the maximum continuous operating voltage Uc reflects the ability of SPD to work without damage for long periods of time. Transient overvoltage is the characteristic of power grid. Of course, the former should be higher than the latter. When the Uc is too high, the transient operating voltage of the corresponding protection element is raised, and the protection effect becomes worse Select by S1 and S2 in GB16895.22 What is the difference between ADSL broadband and fiber broadband? All of our families usually use ordinary ADSL broadband, and those relatively concentrated user groups are using fiber broadband, what is the biggest difference between them? Thats speed.