Direct or Shared fiber

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SteveON

1916 posts

Uber Geek

#99071 12-Mar-2012 11:49

I know this has probably been answered somewhere here, but I am curious about the configuration of the UFB roll out. Does each home get its own pair or is it shared till the cabinet?

Beccara

1469 posts

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#594021 12-Mar-2012 11:51

It's single strand from you to the prisim then a shared strand back to the OLT iirc

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SteveON

1916 posts

Uber Geek

#594023 12-Mar-2012 11:54

I see, I assume they can pump enough frequencies through the line allowing for the maximum speed anyway.

sbiddle

30853 posts

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#594024 12-Mar-2012 11:54

Google GPON if you want to understand how it all works.

Beccara

1469 posts

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#594025 12-Mar-2012 11:55

It's not a wavelength per house or anything, It's GEPON which is 2.4/1.2gbit for each port which allows for plenty of speed for everyone connected. There is a max split of 24:1 on each GEPON port

wired

187 posts

Master Geek

#594278 12-Mar-2012 18:02

There should be two fibers from a house to the cabinet and then a limited number of fibers back to the central office. If you really wanted to, you could get a dark fibre to your house and put WDM gear in so that you have 40 Gbps (or most of the southern cross). All possible.

alexx

867 posts

Ultimate Geek

#594290 12-Mar-2012 18:39

From a little reading, it seems that the current generation of GPON (ITU-T) and EPON (IEEE) are all using a single fibre (per customer node) from the passive splitter, with different wavelengths for upstream and downstream, but the separation of different customer upstream signals is via TDM.

http://en.wikipedia.org/wiki/Passive_optical_network

Future systems might use different wavelengths for different customer nodes to increase capacity. Some more info on proposed next gen PONs here:

http://networks.cs.ucdavis.edu/~mukherje/links/mda-pon-evolution-commag-nov10.pdf
http://www.telematica.polito.it/finochietto/papers/ngPON_AccessNet20.pdf

I'm not sure if anyone is implementing these WDM based systems. Perhaps there is enough capacity in GPON and EPON systems for the time being.

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Zeon

3916 posts

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#594301 12-Mar-2012 19:15

Wait so its a broadcast shared wavelength for upstream? What's the security there?

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raytaylor

4014 posts

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#594359 12-Mar-2012 22:05

Zeon: Wait so its a broadcast shared wavelength for upstream? What's the security there?

https:// part of your web browser and SSL do alot. I am not an expert but i believe there is some general encryption - however there is no special security on DSL and it still can be tapped into if you could be bothered.

Ray Taylor

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SteveON

1916 posts

Uber Geek

#596530 17-Mar-2012 18:57

wired: There should be two fibers from a house to the cabinet and then a limited number of fibers back to the central office. If you really wanted to, you could get a dark fibre to your house and put WDM gear in so that you have 40 Gbps (or most of the southern cross). All possible.

Basically there is no point in having ultra fast broadband when our international pipe is so small...

Zeon

3916 posts

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#596535 17-Mar-2012 19:13

SteveON:
wired: There should be two fibers from a house to the cabinet and then a limited number of fibers back to the central office. If you really wanted to, you could get a dark fibre to your house and put WDM gear in so that you have 40 Gbps (or most of the southern cross). All possible.

Basically there is no point in having ultra fast broadband when our international pipe is so small...

God I'm getting sick of people making this general statement. To summarize:

Cost of international is getting lower very quickly with or without pacific fibre
National backhaul is looking to become one of the most expensive components from those outside Auckland
The content can be put far nearer the user e.g. national or even regional web and akamai/CDN/Google caches could take massive % of traffic from going overseas or even to Auckland
Uses aren't just what we do now but faster e.g. have a remote doctor surgery without doctors using high def video conferencing and medical imaging
Cloud computing for smaller businesses e.g. centralized computing between branches and using datacenters etc. for private cloud

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raytaylor

4014 posts

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#596537 17-Mar-2012 19:21

SteveON:Basically there is no point in having ultra fast broadband when our international pipe is so small...

Soooo not true

Ray Taylor

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kyhwana2

2566 posts

Uber Geek

#596538 17-Mar-2012 19:26

Zeon: Wait so its a broadcast shared wavelength for upstream? What's the security there?

It's encrypted

kyhwana2

2566 posts

Uber Geek

#596539 17-Mar-2012 19:26

Zeon: Wait so its a broadcast shared wavelength for upstream? What's the security there?

It's encrypted

lucky015

743 posts

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#596543 17-Mar-2012 19:39

SteveON:
wired: There should be two fibers from a house to the cabinet and then a limited number of fibers back to the central office. If you really wanted to, you could get a dark fibre to your house and put WDM gear in so that you have 40 Gbps (or most of the southern cross). All possible.

Basically there is no point in having ultra fast broadband when our international pipe is so small...

That is correct to a point.

Currently we have have little need for the capacity to the home to be available until the National and International backbones are properly upgraded.

However with VDSL not panning out as well in NZ as other countries due to interference and the condition of our copper wiring the need will soon arise for something capable of more bandwidth, Also due to location and size of our country we are more likely to benefit from the upgrade than other countries where travel is a simple task, Add in that we tend to be more technology focused people than our current infrastructure allows for the need soon becomes obvious.

Without national and international transit capacity upgrades and price competition UFB does seem to be perhaps a little pointless however, Its not a matter of sitting back and waiting for these to happen first, They are done on an as-needed basis and will not be done until we have the need for them, Companies are perfectly happy to sit back and force us to work with the lower capacity variants as long as they keep their running costs down and until their is a market for large capacity that is all that will happen.

callumb

83 posts

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Devoli

#600766 27-Mar-2012 15:19

kyhwana2:
Zeon: Wait so its a broadcast shared wavelength for upstream? What's the security there?

It's encrypted

GPON is only encrypted in the downstream direction (as the POLT sends all downstream as a broadcast to all ONT's in the PON - the ONT only looks at the data that is actually addressed to it) - in the upstream direction, it uses DBA to assign bandwidth dynamically as needed.

Edit: some decent info on GPON here: http://www.scribd.com/doc/36979788/50/GPON-encryption