Re: Can 2Mbps Fixed IP Broadband serve more users than 10Mbps dynamic IP Broadband?

Thanks for all your advices and comments. Now I understand a bit more on 
this bandwidth issue. Since there are user using 10Mbps dynamic IP 
serving 25-30 users, I am more confident to switch to 10Mbps dynamic IP 
broadband to save some cost and hopefully to achieve some speed 
improvement also.

Thanks again for your help!

H E Lim

[email protected] wrote:
> On Wed, May 26, 2010 at 2:57 PM, helim <[email protected] 
> <mailto:[email protected]>> wrote:
>
>     My company's broadband is a 2Mbps fixed IP service with M1 Connect
>     (original contract with Qala) which costs $277 per month.
>     Currently SingNet has promotion for 10Mbps dynamic IP broadband
>     which cost only $198 per month. Since we had given-up the idea of
>     hosting web server in-house, there is no need to have Fixed IP
>     broadband anymore. I checked with SingNet sales but was advised
>     that the 10Mbps dynamic IP broadband can only serve up to 10
>     concurrent users and if exceeded, the Internet access may have
>     problems. We do have 18 office users but not all are accessing
>     Internet all the time and we also have a Computer Lab which has 12
>     PCs but hardly used by anyone nowadays. I used
>     http://www.bandwidthplace.com/ to test our Fixed IP Internet speed
>     which shows download speed range from 0.843Mbps to 1.016Mbps and
>     upload speed from 81Kbps to 226Kbps. This morning I went to
>     another company which is using Singnet 4Mbps dynamic IP broadband
>     and test the speed and was surprised to find the download speed
>     was 4.648Mbps and upload speed was 513Kbps! Can anyone comment or
>     share some experience on Fixed IP and dynamic
>
>  
> Traditionally, ISPs oversubscribe their available bandwidth.  ie, 
> knowing that not everyone will attempt to fully utilise their 
> bandwidth at the same time, they can safely sell the same 1Mbps to 
> more than one person.  In moderation, and averaged, this allows 
> everyone to enjoy higher maximum speeds at lower cost. 
>
> The extent to which they practice oversubscription is also known as 
> contention ratio.  ie, how many subscribers are contending for the 
> same 1Mbps of bandwidth.  What this could mean is that a highly 
> oversubscribed offering might have higher theoretical burst/peak 
> speeds but achieve lower sustained speeds when everyone else is 
> attempting to use the network, while a non-oversubscribed or fully 
> dedicated offering might have exactly the same burst and sustained 
> performance.  So, this can explain the sales talk that a specific plan 
> can serve X concurrent users - if your users fit their profile of 
> typical users and you exceed the number of concurrent users, your 
> sustained bandwidth requirements /could/ exceed their planned 
> sustained bandwidth delivered.  What's more, if everyone does so, then 
> the true amount of bandwidth achievable by each customer would not be 
> anywhere close to the advertised line speed, and each customer would 
> only obtain the planned sustained bandwidth which could be much much 
> lower, as you've observed.
>
> In practice, none of the ISPs here are willing to tell you what 
> contention ratios they adopt, at least for consumer and lower-end 
> business traffic.  There is an expectation of lower contention ratios 
> for business plans and for higher margin plans (eg. fixed-ip), but you 
> never really know.  So, you have no idea how much bandwidth you can 
> realistically expect.  This simplistic picture is complicated by lots 
> of other factors, and ISPs may also take QoS or packet shaping 
> measures to smooth bandwidth delivery.  Users also typically have no 
> idea of their own traffic profile - how much bandwidth they really 
> need, how bursty the traffic is, etc.
>
> Short answer: bandwidth and fixed-vs-dynamic IP allocation is 
> theoretically orthogonal.  Your description of internet usage 
> requirements suggests that network speed isn't really crucial to your 
> business needs.  If that is correct, just buy whatever you can afford 
> (eg, a 2Mbps dynamic IP plan would likely cost less and perform 
> similarly to your current service; 4Mbps, 10Mbps or higher might 
> improve video streaming, but so what?).
>

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