Re: [apops] Bandwidth calculation

[Geoff Huston <gih@telstra.net>]

this is true - the larger the customer base the greater the dispersion of 
traffic and the higher the upstream 'oversubscription' ratio for a given 
quality of the upstream.

The bottom line - MEASURE YOUR NETWORK! ALL THE TIME!

As you understand more and more about how your network behaves you will be 
able to customise your design to precisely suit the load / quality profile 
that your business plan is targeting.

Geoff


At 07:17 PM 9/18/2002 +1000, Philip Smith wrote:
>Just adding to what Geoff said, I have found from my experience that it 
>also depends on the number of customers you have. 100 dialup customers 
>will probably saturate your network at 5:1, but a 1000 customers will 
>probably work quite happily at 15:1. I don't have it any more, but I used 
>to have a graph which showed the bandwidth required for a dialup network 
>as it grew from 10 customers at V.32 (yes!) to more than 100k customers at 
>V.90 over a period of 5 years. Definitely non-linear, and bandwidth 
>requirements tailed off with a linear increase in customer numbers.
>
>So, in short, overprovision to start with, and then with time you will 
>find that you don't need to provide so much capacity for future customer 
>growth.
>
>philip
>--
>
>At 09:50 17/09/2002 +0530, HARI SHANKAR wrote:
>
>>Is there any thumb rule available which says that X Mbps of bandwidth is 
>>required for Y number of PSTN dialup ports of 56 Kbps.
>>
>>Hari
>
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