[AusNOG] Lightning and FTTC - is it really this bad?

Jarryd Sullivan Jarryd.Sullivan at team.aussiebroadband.com.au
Thu Jan 21 11:44:05 EST 2021

The FTTC NCD's in the customer premise reverse power the DPU in the street(curb). Up to 4 premise connected to the DPU can share the reverse powering of the DPU to allow lower power draw from each user's NTD and also providing a form of redundancy for the users connected to it. So I'd hazard a guess it's that at a minimum 4 lots of copper, 4 NCD's that are reverse powering the DPU so more risk to everyone connected/more chance at lightning impacting additional houses or users.

Jarryd Sullivan

On 21/1/21, 9:55 am, "AusNOG on behalf of Karl Auer" <ausnog-bounces at lists.ausnog.net on behalf of kauer at biplane.com.au> wrote:

    On Thu, 2021-01-21 at 11:04 +1100, Jrandombob wrote:
    > Even in a high lightning area, as Damien said previously, if anything
    > FTTC ought to be LESS susceptible (assuming of course the devices are
    > well designed) to lightning owing to the shorter cable runs.

    There are two ways in to the CPE - the FTTC connection and the power
    supply to the CPE.

    The FTTC connections are themselves powered at the curb, and so may be
    a conduit for spikes into CPE.

    The likelihood of the cable run from the curb to the CPE getting hit
    directly is probably very low, but the likelihood of the power grid
    getting hit and sending a spike down the line to either the curb
    equipment and thence to the CPE or to the CPE directly is unchanged.
    Actually it's probably higher, given the greater number of powered
    devices in the network.

    Regards, K.

    Karl Auer (kauer at biplane.com.au)

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