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

Wiley Siler wsiler at education2020.com
Mon Jun 13 17:37:13 MST 2005 

BTW - The Speakeasy SDSL connection I originally posted about is
delivered via Covad.

The SLA (some of it at least)

Average Network Delivery and Delay2 - Further proof that Covad has
confidence in the performance of our network. 
Delivery - 99.9% successful delivery of all data packets sent from your
location over the Covad network, or you will be eligible for a credit of
up to 10% of your monthly service fee. 

Delay - 110 millisecond average for the round trip of a message sent
from your location to a test point on the Covad network, or you will be
eligible for a credit of up to 10% of your monthly service fee. 

SLA can be found here...
http://www.covad.com/products/access/telespeed/details.shtml#sla

Being only 4000 feet from the Central Office, this works very well for
me.
I have not been able to figure if QoS is possible yet.
Haven't figured out the examples from the Wiki for QoS via HFB (I think)
and no answer from techs yet.

Thanks,
Wiley


 

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Nir
Simionovich
Sent: Monday, June 13, 2005 6:22 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [Asterisk-Users] Should I choose DSL @ 1.5 or a full T1?

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: 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
>>>>--------------------------------------------------------------------
>>>>-
>>>>-
>>>>--
>>>>_______________________________________________
>>>>Asterisk-Users mailing list
>>>>Asterisk-Users at lists.digium.com
>>>>http://lists.digium.com/mailman/listinfo/asterisk-users
>>>>To UNSUBSCRIBE or update options visit:
>>>>   http://lists.digium.com/mailman/listinfo/asterisk-users
>>>>        
>>>>
>>>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
>>
>>_______________________________________________
>>Asterisk-Users mailing list
>>Asterisk-Users at lists.digium.com
>>http://lists.digium.com/mailman/listinfo/asterisk-users
>>To UNSUBSCRIBE or update options visit:
>>   http://lists.digium.com/mailman/listinfo/asterisk-users
>>_______________________________________________
>>Asterisk-Users mailing list
>>Asterisk-Users at lists.digium.com
>>http://lists.digium.com/mailman/listinfo/asterisk-users
>>To UNSUBSCRIBE or update options visit:
>>   http://lists.digium.com/mailman/listinfo/asterisk-users
>>_______________________________________________
>>Asterisk-Users mailing list
>>Asterisk-Users at lists.digium.com
>>http://lists.digium.com/mailman/listinfo/asterisk-users
>>To UNSUBSCRIBE or update options visit:
>>   http://lists.digium.com/mailman/listinfo/asterisk-users
>>    
>>
>_______________________________________________
>Asterisk-Users mailing list
>Asterisk-Users at lists.digium.com
>http://lists.digium.com/mailman/listinfo/asterisk-users
>To UNSUBSCRIBE or update options visit:
>   http://lists.digium.com/mailman/listinfo/asterisk-users
>  
>


_______________________________________________
Asterisk-Users mailing list
Asterisk-Users at lists.digium.com
http://lists.digium.com/mailman/listinfo/asterisk-users
To UNSUBSCRIBE or update options visit:
   http://lists.digium.com/mailman/listinfo/asterisk-users

More information about the asterisk-users mailing list