Larry,
Larry,
All bandwidth is oversubscribed.
In cable modem, the oversubscription comes from more users jumping on the
line at different times or too many users being put on a switch. It will
tend to have "mushy" times and times where you will get more than the
agreed on throughput.
In DSL or T-1, T-3, etc. the companies will oversubscribe what the
bandwidth they own or lease can support. That is, if everyone got on at
once and maxed out their capacity, an additional person may not be able to
get on, or everyone would start getting their effective bandwidth
reduced. On a quality service, they will do sophisticated statistical
analysis of traffic to ensure that for all intents and purposes, you will
never be out of service or have your agreed upon bandwidth reduced. They
will add architecture and bandwidth in response to growth projections.
For the cheaper bandwidth DSL services you buy, you will start to have your
effective rate reduced, or, it will start out fine, then they bring on too
many new subscribers. It doesn't matter what you have the ports going out
set at if the line going in doesn't have enough bandwidth to supply them.
In both cable and poor telcom related cases, new bandwidth will be gained
due to customers screaming, then they will start to acquire the additional
architecture, or customers leaving. DSL will tend to have a more
"guaranteed" minimum performance, but be careful who is providing the
bandwidth to them. Northpoint went bankrupt and people's service got
dumped (Including us. Very little notice. We went through Globalcomm, and
they were Globalcomm's supplier. We scrambled to set up a replacement
dial-up connection). There are doubts about the survival of Rhythms and
Covad. You Would probably want to avoid people that use them as a
supplier, unless you are bandwidth bottom feeders like us, currently
Globalcomm uses Rhythms.
If you really gotta have the guaranteed delivery, pay more money for a
better provider. If you REALLY have to have the bandwidth pay the premium
for a quality T-1 or fractional T-1.
Ike
At 04:30 PM 5/16/01 -0400, you wrote:
> >Remember that with DSL everyone on the line
> > share access and the speed is relative to how many person are connected
>and
> > what they are doing at any one time. If your customer gets 1.5Mb speed
> > they will share that with other users in the area and with their own
> > internal workstation.
>
>DSL is not shared with other users. That is, the bandwidth you have is
>dedicated to your phone line. Of course, the users _within_ your
>organization share the bandwidth on the line.
>
>Cable modems do provide bandwidth that is shared with other users in your
>neighborhood.
>--
>Larry
>
>
>
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