[AusNOG] DSL G.Fast Details

[Joseph Goldman]

I would imagine they would be replaced with passive splitters as per 
standard PON design, for in the pits.

I believe most road-side FTTP cabinets for NBNCo are unpowered, and are 
simply a passive splitter (or have the potential to be), so if we were 
to go FTTdp to FTTP, just replace copper with fiber and have the passive 
splitter in the pit, backhauled to the OLT.

On 04/02/15 11:47, Mark Delany wrote:
>>> I found it particularly interesting that power is or can be supplied
>>> to the FTTdp node by the CPEs, which means the FTTdp equipment can
>>> possibly be installed inside the footpath pits themselves without
>>> needing power infrastructure
>> Is there an upgrade path to this approach or is FTTdp the end game?
>>
>> * I'm not quite sure what you're asking. Are you asking about an upgrade path to FTTdp, or an upgrade path from FTTdp to FTTP?
>  From FTTdp to FTTP. Say, 10 years after we're all spun up with FTTdp.
>
>> I don't really understand how there could be an upgrade path as
>> replacing all the downstream copper with fibre leaves you with the
>> problem of powering the pit
> Yup. That was rather the point of my post. How that might be solved as
> part of moving to fibre all the way.
>
>> * That's the point of my comment - the power for the 'pit'/FTTdp equipment in the pit comes from the attached subscribers' CPE (and therefore the subscribers' mains supply.) The FTTdp equipment in the pit doesn't need an independent power source. In other words, if there are no active CPE attached to the FTTdp equipment in the pit, it isn't operating.
>>
>>   - unless the vestigial copper stays forever
>> as a power source. Alternatively, custom pit-to-premise cabling could
>> include POE-like stranding.
>>
>> * There is no custom pit-to-premise cabling, the existing copper leadins are used
> Yes I know. But in a post-FTTdp world when you spin up new fibre to
> the premise you might include something that solves the power problem.
>
>
>> * I think the emerging trend could be described as 'wireless cloud first' for typical end users. I consequently wonder whether many 100s of Megabits to the home is really going to be necessary.
> That's not what the bandwidth numbers say.
>
>
> Mark.
>
>
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