Greetings brother... One other way of purchasing required bandwidth in an
economical manner and still get high performance is to use an asymmetrical
model of bandwidth provisioning which mirrors the actual bandwidth demands
on your network.
Typical internet traffic is 20-40% upstream and 80-60% downstream. If you
can negotiate with your upstream bandwidth provider to supply you with an
asymmetrical link that is, say: 128k up and 512k down, you should be able to
get a better cost/performance benefit than a symmetrical 512k link.
This can even be taken further if your bandwidth is normally provided
through an international leased line. The costs of terrestrial connectivity
are much higher than satellite connectivity so what you can do is take a
terrestrial line of 128k (symmetrical) and contract for a simplex (receive
only) satellite downlink with a company such as Interpacket for the
remaining bandwidth (512) at a much lower per K cost. This way you can
monitor, manage and scale both links according to the actual growth patterns
of your network.
By the way, this is a model that is used by the majority of ISPs in Kenya
and from my understanding by the majority of ISPs who depend on
Intercontinental lines for their connectivity to the Internet.
Hope this helps,
ps. I will be in Mzuzu from 23rd - 31st December, please tell William
Chimsisi. I wouldn't mind meeting you guys again, it's been a long time
since Inet99 :-)
> -----Original Message-----
> From: African Network of IT Experts and Professionals (ANITEP) List
> [mailto:[log in to unmask]]On Behalf Of Dr Paulos Nyirenda
> Sent: Sunday, December 17, 2000 1:50 AM
> To: [log in to unmask]
> Subject: Re: bandwidth per user - Internet standards
> On 25 Nov 00, at 16:36, George Sadowsky wrote:
> > I'm not sure I understand the question. Most people in developed
> > countries have 56 Kbps modems, and there is a slow but sure migration to
> > more bandwidth through broadband connectivity such as cable
> models or DSL.
> > I think that the practical answer for developing regions is "as much as
> > you can get the telephone lines to support, up to 56K."
> > Does this help?
> Thanks but, no actually it did not. The practical answer does not
> give a good
> estimate to design an optimal system in a developing or developed region.
> Although the answer I was seeking should apply to design for
> ISPs, I was looking
> for info for the design of an optimal system where there is
> enough money to
> purchase all the required bandwidth but the application also
> demands that there
> should be good bandwidth efficiency (without excessive wastage) as well.
> I received some good answers and I have copied one below. I would
> like to thank
> those who answered and gave possibly good design criteria. Below
> is one such
> good answer that helped and I am posting for the benefit of
> others who requested
> the same. The information greatly helped in a project we are involved in.
> Dr Paulos Nyirenda
> Malawi SDNP Coordinator
> From: "Barry Raveendran Greene" <[log in to unmask]>
> To: <[log in to unmask]>
> Subject: RE: Capacity Planning
> Date sent: Fri, 24 Nov 2000 08:59:52 -0800
> I used a formula of 1/3 of the dial-up capability plus 50% of the
> dial-pool to figure out upstream capacity of the POP. For a 28.8Kbps link
> with 50 dial ports that would be:
> 28.8/3 = 9.6
> 50/2 = 25
> 25 * 9.6 = 240 Kbps.
> There are other ways of doing this. Try asking the question on the
> following aliases:
> [log in to unmask]
> [log in to unmask]
> That will get you some other points of view.
> > >What is the standard or optimum allocation for bandwidth
> (kbps) per user
> > >for Internet connections?
> > >
> > >It seems difficult to get a ball figure from the Internet Standards
> > >Archive
> > >
> > >Where are such Internet data published other than searching through
> > >RFC's?
> > >
> > >Where can I find best practices on actual operating networks?
> > >
> > >Regards,
> > >
> > >Paulos
> > >======================
> > >Dr Paulos Nyirenda
> > >Malawi SDNP Coordinator
> > >[log in to unmask]
> > >Tel: +265-674979 / 824787