On Mon, Mar 01, 2004 at 07:08:29PM -0600, Michael Graves wrote:On the UK DSL using G.711 you should easily get 2 concurrect calls, G.711 uses about 84k(incl overhead) in each direction, so 2 calls would be 168K (of the 256k)
I have disagree about the ADSL. I have a1.5 Mbit/512kbit service from
Covad (in the US Southwest) and I have sustained 4 calls without a
problem. I prefer to use GSM over G.711to squeeze it down, but that is
my choice. I don't feel that call quality is substandard.
That's the crunch (1.5/512) ... it's actually the 512 which is relevent. Virtually all DSL in the UK is a wholesale product from BT (they have about 2 million customers, Easynet who local loop unbundle may have 20,000, the rest of the providers maybe another 10,000 between them).
All BT ADSL is 256K upstream, all BT DSL is contented (in theory 20:1 and 50:1, but actually a lot less than that), there are a few providers doing their own contention over BT's product.
However the 256K upstream is still the limiting factor, so you can get one, and MAYBE two VoIP lines over it. If BT would up the upstream to 512, you could probaly get 4 out of it ....
Steve
If you switch o GSM or iLBC you should get 6 concurrent calls, and if you were to use IAX2 trunking you could *maybe* squeeze another one..
Other codecs could offer even more but I haven't tested them..
Later..
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