2mb leased line throughput

is a 2mb leased line throughput full duplex so you get 2mb up / 2mb down
at saame time or is it if you are using 512k down you only get approx
1.5mb up?

On Sun, 19 Jun 2005 00:58:31 +0100, jas0n <(E-Mail Removed)> wrote:

>is a 2mb leased line throughput full duplex so you get 2mb up / 2mb down
>at saame time or is it if you are using 512k down you only get approx
>1.5mb up?

generally symmetric
http://en.wikipedia.org/wiki/Leased_line

Phil
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On 19 Jun 2005 00:58, jas0n <(E-Mail Removed)> wrote:

>is a 2mb leased line throughput full duplex so you get 2mb up / 2mb down
>at saame time or is it if you are using 512k down you only get approx
>1.5mb up?

It'd be the same speed in each direction so you could be sending 2000 kbps
as well as receiving at that speed (though clearly for acknowledgements to
be able to be transmitted there'd need to be sufficient spare time in each
direction to pass those packets too). Out of interest, are you meaning an
SDSL connection, or an E1 leased line ? Most ISPs have significant fees to
provide the latter (because they are often going to provide you that speed
within their network and out onto the internet too). For SDSL, it's still
a fair amount of money each year, as well :-)) Peter M.

"jas0n" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed). ..
> is a 2mb leased line throughput full duplex so you get 2mb up / 2mb down
> at saame time or is it if you are using 512k down you only get approx
> 1.5mb up?

WAN links are normally full duplex, esp. at higher speeds (say over 64
Kbps) - otherwise the turnaround time will massively reduce the overall data
rate.

some links have different bandwidths in the 2 directions - ADSL for one.

a conventional 2 Mbps (e1) line is the underlying bearer for primary rate
ISDN - used for bigger PBX links to the PSTN. Depending on how the link is
formatted you may get 30, 31, or 32 channels of 64 Kbps each, so the
available speed may be a big under or over 2 Mbps. Because it supports the
conventional UK voice network, you can get these lines just about anywhere.

several ISPs support SDSL - this gives a link that is adaptive, with upto
2.3 Mbps - BT actually limit their SDSL connections to 2 Mbps best case -
but longer links to the exchange will have lower data rates
--
Regards

Stephen Hope - return address needs fewer xxs