[AusNOG] NBN 1Gb "fiber" services

[John Edwards]

NBN FTTH is using Corning's 8-port multitap, sometimes with a 4-port
extension.

>From memory, they originally specified a maximum drop-cable length of 150m.
This may limit the number of premises that can physically connect to the
multi-tap in a neighbourhood with 20m street frontages on 1/4 acre blocks.

Because of the use of 12-fibre ribbon cable (1 ribbon per multitap), it
would be tricky to fix a physical fault without moving 8 services at a time
- this might be why 8 ports are spare on the splitter. The ribbons have 12
fibres as well - maybe there is a 12 + 12 + 8 = 32 configuration that
leaves 2 sets of 4 fibres spare.

John






On 25 February 2016 at 10:09, Jake Anderson <yahoo at vapourforge.com> wrote:

> On 25/02/16 10:22, Aftab Siddiqui wrote:
>
>
>  Hi Jake,
>
> The max split ratio is 32:1, Generally NBN are running ~20:1 or so in the
>> field I believe (or thereabouts)
>>
>
> Is this NBN policy to do max 32:1 splits to keep contention to certain
> level? because thats not a technical limitation or ALU's limitation for
> sure.
>
>
> The fibre distribution hubs they are installing have 32:1 splitters in
> them. Generally they aren't using every port on the splitters and I believe
> the design was to use a max of 24 ports per splitter though don't quote me
> on that.
>
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