[LINK] Turnbull's NBN

[Paul Brooks]

On 10/04/2013 8:41 AM, Kim Holburn wrote:
> If I understand what they're saying, they are going to go to VDSL which is 55Mbps but requires cat5 or 4 copper twisted pairs from the node to the house.  The exchange will be too far away to get speeds like that, so they're going to have to build nodes every block and recable the last mile with copper.  That sounds to me insane. 

They are going to use VDSL2, but it doesn't require the cat5 or 4 twisted pairs, or
recabling the last mile *if* the existing copper is good quality.
VDSL2 is really just ADSL2+++  -  VDSL2 on a single phone line can get up to 80 Mbps
if you are real close to the exchange and have a good line, and beyond about 800
metres line length the speed has decreased to be identical with ADSL2+ speeds at that
distance, and then decreases with distance just as ADSL2+ does.

They are proposing to put nodes out on the street side with the VDSL2 equipment that
would normally be in the exchange, and reterminate the middle of existing phone lines
into the node cabinets. so that they can guarantee that nobody's phone line is longer
than 800 metres. That 800 metre figure has not been chosen at random. And they are
proposing to replace the last-mile cable IF it won't support the 25 Mbps speed.

Effectively its a whole pile more RIM cabinets, except that the current RIM cabinets
are sited so the maximum line length is around 1.5 km - which was Telstra's original
NBN 1.0 proposal back in 2005, based on ADSL2+. This coalition proposal is NBN 5.0

> Also Turnbull said on 7:30 report that Telstra would just hand over their copper for free.  I don't recall that being in the NBN Telstra agreement.  Lee was trying to get him to cost that but he insisted it was free - doesn't seem likely with Telstra.  When she asked him who would maintain the last mile copper he said they would contract Telstra to do it but refused to say how much it would cost.
I'm sure Telstra will tell him he's dreaming. It will be rented, as ULLS is now,
purchased for additional funds, or a third alternative handed over for "free" in
exchange for selling a soul - something like a century long guaranteed regulatory
holiday from competition and no forced separation or some such horse-trade.

Either way it will cost a lot more to maintain and run, and adding in the maintenance
costs over 40 years will end up costing a very large amount more than the current NBN
ever would.

P.




On 09/04/2013, at 1:51 PM, tomk wrote
>>> Speeds over Copper now rival and exceed those over the Aussie NBN specified fibre.
>> For the typical copper lead-in to a house you're looking at a maximum data rate of 50Mbps asymmetric. That's not actually available right now in shipping equipment.
>>
>> The NBN-installed fibre can run up to 10Gbps asymmetric. However the lasers and receivers for this are expensive. So the question is how slow to run the NBN last mile fibre so that it results in a service which is cheap enough for householders. NBNCo have decided that they will use 100Mbps lasers and receivers.
>>
>> This is the essential difference between the two proposals: for the NBN the question is how slow to run it, and errors can be corrected cheaply enough (because such an error will result in pent-up revenue which can use used to pay for upgrades). For the Liberal proposal the question is how fast can it be made go, and if the top speed estimate is in error, then the only way to correct it is to build a NBN.
>>
>> Interestingly for those who follow political philosophy, the Liberal proposal essentially nationalises Telstra's last mile copper. Not quite what you'd expect from a conservative party.
>>
>> -glen
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