Wireless Access

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Access network design for branch, remote, outdoor, and campus locations with HPE Aruba Networking access points and mobility controllers.
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AP-LAR-1 for RF cables longer than 2m. Why so?

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  • 1.  AP-LAR-1 for RF cables longer than 2m. Why so?

    Posted May 14, 2014 08:50 AM

    Hi Everyone!

     

    I was looking through AP-270 ordering guide (http://www.arubanetworks.com/pdf/products/OG_AP-270Series.pdf) and saw that AP-LAR-1 can be used only with RF cables longer than 2 m. Can anyone explain why? Don't we need lightning arrestors for 1 m RF cables as well?

     

    Thanks!



  • 2.  RE: AP-LAR-1 for RF cables longer than 2m. Why so?
    Best Answer

    EMPLOYEE
    Posted May 14, 2014 02:00 PM

    The protection circuits in the AP-274 have been beefed up relative to the 175.

     

    So long as the chassis is grounded the internal protection will handle any surges induced in short cables.

     

    Note that the chassis needs to be grounded when using LAR-1 as well.

     

    Speaking of induced, induction of voltages is a function of cable length. Longer cables = higher inductance = higher induced voltages.