"The Natural Philosopher" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)
> www.GymRatZ.co.uk wrote:
>> DAB sound worse than FM wrote:
>>> "The Natural Philosopher" <(E-Mail Removed)> wrote in message
>>> news:(E-Mail Removed)
>>>> DAB sound worse than FM wrote:
>>>>> Ofcom's published its research into broadband speeds:
>>>>>
>>>>> http://www.ofcom.org.uk/research/tel...bbspeed_jan09/
>>>>>
>>>>> Full report:
>>>>>
>>>>> http://www.ofcom.org.uk/research/tel...peed_jan09.pdf
>>>>>
>>>>>
>>>>>
>>>> guess what : Thats exactly what I would have expected.
>>>>
>>>>
>>>> With an up to 8Mps service you would expect the mean to be a bit
>>>> under 4.
>>>>
>>>> Actually I am surprised its that GOOD.
>>>
>>> Yeah, I was surprised it's that good as well. Another figure
>>> that's
>>> surprisingly high was that the average for people with "over 8
>>> Mbps"
>>> connections is 9.4 Mbps - on page 11. Then again I don't know what
>>> people on 20 Mbps Virgin cable actually get in practice, but I'd
>>> have
>>> thought the average woudl be signfiicantly lower than 9.4 Mbps for
>>> ADSL2+ users - or maybe I've been reading too many doommongering
>>> articles about what speed ADSL2+ would typically deliver?
>>
>> I don't see why ADSL2+ would be any lower. If you can't get
>> anywhere
>> near the 20+ Mbps speeds then you'd be pretty stupid to take out
>> that
>> service, and would go for a <8Mbps which unless you were right on
>> the
>> fringe of an area I'd expect 4Mbps to be a very typical average.
>>
>> Or something.
>>
>
> Well I have been trying to get my head round that..considering an
> idealized exchange with customers uniformly distributed in a circle
> round it..
>
> attenuation will vary as the distance from the exchange..bandwidth
> varies as the attenuation? but customer numbers will vary as the
> square
> of the distance so you would expect MOST customers to be less than
> 4Mbps..
You're right that most people would live over half the distance from
the exchange to the edge of the circle, but the graph of speed vs line
length is flat from zero up to about 1600 metres from teh exchange:
https://cyberstore.tpg.com.au/images/migrate_faq2.gif
So that would compensate for fewer people living within halfway to the
edge of the circle. I don't know whether the graph is flat in practice
or not though.
> But the critical thing is the radius the exchange serve. Obviously
> if
> there is a cutoff at say 2mpbs as those customers are on the
> adjacent
> closer exchange, it will chop off the bottom half of the graph.
Yeah, that would increase the average a bit as well.
--
Steve -
www.digitalradiotech.co.uk - Digital Radio News & Info
The adoption of DAB was the most incompetent technical
decision ever made in the history of UK broadcasting:
http://www.digitalradiotech.co.uk/da...ion_of_dab.htm
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