[Asterisk-Users] Should I choose DSL @ 1.5 or a full T1?

[Marcelo Pacheco]

SDSL has symmetrical speeds and full duplex communications.
Of the widely deployed lan/wan technologies, the only one I know of that is 
half-duplex is 802.11{b,g}.

The only technical difference between a T1 and SDSL is how it's physically 
delivered to the customer, what usually happens is that a T1 is not oversold, 
while an SDSL is oversold anywhere from 8:1 to 3:1.

ADSL is full duplex as well, if you don't know how to do QOS then it will feel 
like it's half duplex, but it's not. I have 1000/320 ADSL that I can use full 
bandwidth both ways.

Marcelo Pacheco

Em Seg 13 Jun 2005 20:54, Damon Estep escreveu:
> You are aware that DSL (even SDSL) is half duplex and a T1 is full
> duplex, right?
>
> 1.5m sdsl can only do 768 sustained duplex, or 1.5 out 0 in, or 0 out
> 1.5 in. a T1 will do 1.5 in and 1.5 out sustained.
>
> This is due to a separate transmit and receive path on a t1 and a shared
> path on sdsl.
>
> The s in sdsl means symmetrical, not duplex, that is that the signaling
> rate is the same in either direction, but still half duplex.
>
> For VoIP a t1 is worth double what a 1.5 sdsl is because of the duplex
> nature of the traffic, unlike most internet that is download-centric.
>
> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com
> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Wiley
> Siler
> Sent: Monday, June 13, 2005 9:43 AM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: RE: [Asterisk-Users] Should I choose DSL @ 1.5 or a full T1?
>
> Speakeasy SDSL Is 1.5 Megs, is business class (so you get an SLA) and
> only costs around $100 per month.
>
> W
>
> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com
> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Robert
> Goodyear
> Sent: Friday, June 10, 2005 7:02 PM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [Asterisk-Users] Should I choose DSL @ 1.5 or a full T1?
>
> On Jun 10, 2005, at 6:38 PM, Michael Welter wrote:
> > Barton Fisher wrote:
> >> I'm looking to expand my bandwidth for my Asterisk PBX.  Why should I
> >>
> >> choose a T1 over DSL for my asterisk server?  I found someone
> >> offering T1's for $290 a month + Loops or 3 Meg for $561 a month +
> >> Loops.  Is this a good deal?
> >>  Thanks
> >>  Bart
> >> ---------------------------------------------------------------------
> >> -
> >> --
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> >
> > Where are you located?  What CLEC gives you a T-1 for $290?
>
> FWIW I provisioned a PRI and a DS-1 for $300 each. Don't know if I'm
> getting a break for having a voice and a data circuit broken out from
> one fiber drop, but that's what I'm paying here in Orange County. Also,
> I had a business cable modem before, which was *allegedly* not shared
> for business customers (suspicious) and the throughput was a roller
> coaster, as was the latency. The DS-1 cleared all that up.
>
> /rg
>
> Robert Goodyear
> Brand Up LLC
> http://www.brand-up.com
>
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