[asterisk-dev] NFAS Implementation Spanning Multiple Servers

[Chris Parker]

On Feb 2, 2006, at 7:44 PM, Steve Totaro wrote:

>
>
>> -----Original Message-----
>> From: Chris Parker [mailto:cparker at segv.org]
>> Sent: Thursday, February 02, 2006 8:27 PM
>> To: Asterisk Developers Mailing List
>> Subject: Re: [asterisk-dev] NFAS Implementation Spanning Multiple
> Servers
>>
>>
>> On Feb 2, 2006, at 5:04 PM, Steve Totaro wrote:
>>
>>> Hello Dev Folks,
>>>
>>> Recently I asked a question on the list about NFAS being able to
> span
>>> across multiple servers.  Kevin F said that this was something in
> the
>>> works and should show up very soon.
>>>
>>> I have a real need for this.  I have a T3 going into an Adtran
> MX2800
>>> and then into seven asterisk boxes with quad T1 cards.  The way
> things
>>> are now, I need seven D channels to go PRI.
>>
>> Put two quad cards in each box?  4 D's for the entire CT3.
>>
>> 8 is the limit on how many T1's I've run w/o running into problems
> with
>> NFAS in the dialup world.  And that's with fewer CPS than voice
> traffic
>> will see.
>>
>> -Chris
>> --
>
> We considered this but with 1U boxes and a single card per box,  
> even if
> one server dies, the impact would be minimized.  4T1s instead of 8.

How many go down when you loose the D channel?  You've got exposure to
 > 4 PRI going down either way.  Your choice.  :)

> Besides, going from seven to four is not that much of a cost  
> savings to
> justify the redundancy issue of having separate boxes.

How many D channels are you thinking you'll get this down to?  2?  Is
$200 / month difference worth the added complexity of multi-chassis
NFAS?

-Chris
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