[AusNOG] DSL G.Fast Details

[Andrew Jones]

It would depend what you were putting in the pit. If it were a passive 
splitter for a GPON-style network, you probably wouldn't need power. 
Same if you have enough for a strand per house coming into the pit, you 
could just splice or patch it through.

If you need to run a switch of some description in the pit, you'd need 
to power it.


On 04.02.2015 11:51, Greg Anderson wrote:
> Pardon my ignorance, but if you were to progress from FTTdp to FTTP,
> I would have expected there to no longer be a need for power in the
> pit anymore (once all FTTdp was upgraded).  Am I not taking something
> into account?
>
> On 4 February 2015 at 10:47, Mark Delany <g2x at juliet.emu.st> 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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>
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> GREG ANDERSON
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