Messages in this thread | | | From | "Henning P. Schmiedehausen" <> | Subject | [DEFINITELY OFF-TOPIC] Re: ADSL vs Leased line | Date | Tue, 18 Feb 2003 09:01:08 +0000 (UTC) |
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Florian Weimer <fw@deneb.enyo.de> writes:
>John Bradford <john@grabjohn.com> writes:
>> A leased line is guaranteed bandwidth,
>Not at all. Welcome to the wonderful world of ATM Traffic Management.
That's the very point John was trying to make. A leased line in the classic sense (E1/T1/ISDN) _is_ guranteed bandwith. You get 64k, 128k, 1920k, 1984k 2048k [1] guranteed, fixed bandwith synched with a master clock.
And: bandwidth on a leased line != IP bandwidth. And with DSL lines (which are either HDLC over copper (e.g. Lucent HST-DST) or simply ATM-25 over copper (Cisco 14xx / Lucent Cellpipes) you can even get both.
So your "wonderful world of ATM traffic management" is only correct for some flavours of DSL lines.
Regards Henning
Let's kill this thread. :-)
[1] 1920k = 1 slot for network management, 1 slot for connection management, 30 channels data 1984k = 1 slot for connection management, 31 channels data (G.704) 2048k = 32 channels data (G.703)
A least in Germany, a "2 MBit leased line" can come in any of these flavours.
-- Dipl.-Inf. (Univ.) Henning P. Schmiedehausen INTERMETA GmbH hps@intermeta.de +49 9131 50 654 0 http://www.intermeta.de/
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