RE: Re: [OT] WAN throughput comparisons

["Paul Gordon" <paul_gordon@xxxxxxxxxxx>]

Thanks David, that's good stuff, and gave me a few pointers I hadn't
thought
about...

cheers.

Paul G.



>From: "David Buckley" <db@xxxxxxx>
>Reply-To: ukha_d@xxxxxxx
>To: ukha_d@xxxxxxx
>Subject: [ukha_d] Re: [OT] WAN throughput comparisons
>Date: Tue, 27 Jul 2004 21:46:08 -0000
>
>--- In ukha_d@xxxxxxx, "Paul Gordon" <paul_gordon@h...>
>wrote:
>... ballpark figure ... throughput ... ideal conditions, over
> > a variety of circuits, such as:
> >
> > 1.5Mbps T1
> > 12Mbps ATM-PVC
> > 2Mbps IP-Flex
> > 8Mbps Cellstream
>
>Don't know anything about IP-Flex, but I've used all the others (or
>similar to), and under "ideal conditions" (i.e. you keep the
pipe
>full in one direction, which for a migration is the case, as you're
>copying entire volumes from sorce to destination site) you will
>achieve the divide by ten byte throughput.  So a T1 will get
>1.5mbit/10 = 150KByte/sec.  Assuming not NetWare with IPX!  The ATM
>circuits should get better than CIR/10 due to bursting above CIR.
>
>I assume you know that with commercial ATM systems you have a
>guaranteed "bandwith", called the Comitted Information Rate
(CIR),
>and the network will let you "burst" above the CIR if it has
spare
>capacity in its trunks, and you have fast enough connection to the
>ATM network to exceed the CIR.  So you may have a 3mbit/sec CIR and
>an 8mbit/sec physical connection.  You'll always get 3mbit/sec,
>guaranteed, but you may get (a lot) more, up to 8mbit/sec, some of
>the time.
>
>I've used ATM both with Bay Centillion and BCN locally and with
>cisco catalyst over local fibre and WAN dark fibre (but not across a
>providors cell network), and the extra packetisation steps required
>above what FDDI or 1000baseF needs dont seem to make any difference.
>
>With a migration project Cellstream might be very cool, as its gonna
>happen out of hours, when the rest of the world is quiet, so there
>should be plenty of burstable capacity above your CIR...
>
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>Yahoo! Groups Links
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