[AusNOG] NBN 1Gb "fiber" services

[Quentin Rittman]

I’d say that 150m limit was either changed or removed as I have several services that are considerably longer than that (1 is ~340m from multiport to PCD) only issues were in waiting for the longer cables to arrive for the installer (guy who did the job said he’s got access to 500m lengths as required)

From:  AusNOG <ausnog-bounces at lists.ausnog.net> on behalf of John Edwards <jaedwards at gmail.com>
Date:  Thursday, 25 February 2016 at 11:20 AM
To:  Jake Anderson <yahoo at vapourforge.com>
Cc:  Paul Brooks <paul.brooks at tridentsc.com.au>, "<ausnog at lists.ausnog.net>" <ausnog at lists.ausnog.net>
Subject:  Re: [AusNOG] NBN 1Gb "fiber" services

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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