Marcelo Pacheco wrote:
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}.
802.11b/g are standards used in wireless (Wi-Fi) connections, there is
no relation to the symetrics or
asymetrics of the actual physical line.
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.
That is correct in the genereal idea, however, as xDSL technologies are
switched technologies, unlike
cable (DOCSIS) technologies, the fact that you are overloaded 8:1 or 3:1
will not really matter. As long
as your equipment supports QoS correctly, you shouldn't have a problem.
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.
ADSL appears to be half-duplex only due to the fact that most ISP's
"misconfigure" the modems and routers.
As a rule of thumb, the modem/router can be re-configured to utilize
both channels to the fullest, but again, this
must rely on the fact that your ISP's equipment supports QoS at the
switch level correctly.
Nir S
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: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] 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: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] 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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