[Asterisk-Users] T-1 vs channelised T-1?

[Chris Travers]

Damon Estep wrote:

>  
>  
>
>>In part I'm trying to figure out at extactly what point it 
>>might make sense for a small office to consider a T-1 vs DSL 
>>incombination with POTS or BRI. Also, I'm just very curious.
>>
>>Michael
>>--
>>Michael Graves                           mgraves at pixelpower.com
>>Sr. Product Specialist                          www.pixelpower.com
>>Pixel Power Inc.                                 mgraves at mstvp.com
>>
>>o713-861-4005
>>o800-905-6412
>>c713-201-1262
>>
>>    
>>
>
>Keep in mind that a 1.5mbps T1 is a full duplex circuit, 1.5 up and 1.5
>down at the same time, you need a 3mbps DSL line to get 1.5mbps up and
>1.5mbps down at the same time. Voip traffic requires 2 way data streams,
>wheras TYPICAL internet use is more down than up.
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>  
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Here are a few things to consider:

Fractional T1's don't have the 4 to 2 wire conversions at your phone 
switch of you are doing VOIP or other digital telephony technologies.  
As a result, you should not have to deal with echo cancellation as much 
if you are on a fully digital circuit.  This means your system is 
simpler and easier to maintain if everything is digital end-to-end.

However, T1 cards are far more expensive for a few lines than FXO cards 
so if you only need two lines, you might consider a BRI instead, and 
maybe POTS with DSL.

Fractional T1's are just an ordinary T1 with only a certain number of 
channels active.  You still have all the hardware needed for a T1, but 
you are not paying for more capacity than you need on the actial telco 
connection.

For 4 or fewer lines, I would probably consider dual BRI's or quad FXO's 
(due to infrastructure cost) but for more than that, I think that the T1 
solution is so much easier to work with that it wins out completely.  Of 
course if you need to be able to add capacity quickly, then the 
fractional T1 is better.

Best Wishes,
Chris Travers
Metatron Technology Consulting
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