[asterisk-users] Learn some terminalogy before mounting this task.

Jerry Jones jjones at danrj.com
Mon Jul 2 16:52:45 CDT 2007 

On Jul 2, 2007, at 4:31 PM, James R. Stevens wrote:

> All,
>
> It's been some time since this thread was alive but we are now seeing
> some progress in this project. Which I will document.
> We have ordered a T1 for the new building which we are moving (We are
> getting 14 channels of the T1.) and have a Sangoma A101 card for a 3U
> rack server.
> The T1 will have B8ZF decoding and ESF framing  which the sangoma card
> should handle.
>
> They asked me if we want NI1 or NI2 ?? Is this a reference to the  
> PRI ?
Yes. You want NI2.


>
> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com
> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Pierre
> Marceau
> Sent: Tuesday, April 10, 2007 11:25 PM
> To: asterisk-users at lists.digium.com
> Subject: Re: [asterisk-users] Learn some terminalogy before mounting
> this task.
>
> James,
>
> I'm sorry that I can't add anything but just wanted you to know that I
> am watching this thread with great interest and suspect that many  
> others
> will too.
>
> Thanks in advance for posting lots of details as you go thru the
> process.
>
> Pierre
>
>
>>>> abalashov at evaristesys.com 4/10/2007 10:41:36 PM >>>
>
> Hi James,
>
>    Admittedly, the terminological and conceptual barrier may present
> some
> impediments to the completeness and specificity of answers, so we  
> might
> have to work at this a bit, but let's see how we can help:
>
> On Tue, 10 Apr 2007, James R. Stevens said something to this effect:
>
>> We have a T1 coming into the building(FYI-Our Voice and Data are on
>> separate T's) terminating at the Smart Jack.
>
>    Are you implying that there are two T1 circuits -- one voice,  
> and one
>
> data?  Or do you mean that the T1 is channelised and some of the
> channels
> are used for voice and some for data?  That's kind of what it sounds
> like.
> Sounds like you can do 7 calls on voice channels and the rest are
> provisioned as a clear-channel data pipe.
>
>    That would mean that you have some equipment for breaking them  
> out on
>
> your premises.  The channel bank would break out the voice lines as  
> FXO
> analogue lines (if you set it to) and those probably feed into your  
> PBX.
>
> The rest of the channels used for data would probably be signaled  
> out on
> another T1 interface, but with some subrate DS0 channels missing.
> That's
> ust a guess.
>
>    But what you say below suggests that my theory is wrong, so perhaps
> it is
> the case that you have separate voice and data T1s after all, even
> though
> you refer to it in the singular.
>
>    Do be aware that under no circumstances does anyone generally refer
> to a
> T1 as a "T."  :)
>
>> I can tell you our current phone system can handle 7 phone calls at a
>> time:
>>
>>   Does this mean the T only has 7 channels provisioned out of the 24
>> possible?
>
>    This is possible.  Do you happen to know what kind of signaling is
> used
> on it?  Is it an ISDN PRI, or an E&M trunk?
>
>>  Does a channel (In terms of the T1) = a port?
>
>    A port on what?  The channel bank?
>
>    Channel banks generally do break the DS0s (subrate 64 kbps  
> channels,
> of
> which there are 24 on a T1) out, but some more sophisticated ones have
> the
> capability to do other things as well.
>
>    If so, the answer is yes.
>
>>  How many phone calls can one TDM400 support concurrently? (four ??)
>
>    If it has four FXO ports and four FXO modules, yes.  They come in
> different combinations.  Some come with 2 FXO (outside POTS lines  
> to CO)
>
> and 2 FXS (plain analogue POTS handsets) ports, etc.
>
>>  Would I be better off getting a Zapata T1 card and forgetting the
>> Channel bank all together(Use the digital signal)?
>
>    You could do that.  Personally, the easiest approach I would say
> would be
> to order a PRI.  They've probably considerably gone down in prices,  
> too,
>
> especially if you go shopping with some friendly CLECs.  The rule of
> thumb
> in the industry is that generally, once you pass the threshold of  
> six or
>
> seven POTS lines, it becomes economical to just order an entire  
> PRI, and
>
> once you do that, there usually aren't *very* considerable savings  
> to be
>
> gained from turning down all but a few channels.  A PRI has 23  
> channels
> (bearer channels ("B channels")) and one signaling channel ("D
> channel");
> it's a type of T1-based ISDN interface.
>
>    So, you might potentially be able to get 23 in/outbound phone lines
> for
> roughly the same cost or a modest increase, which would increase your
> organisation's capacity to do things like conference calling and other
> things which tie up large amounts of outside lines.
>
>    Do beware that if you go this route, PRIs can be ordered as
> "inward-only"
> (typically used for modem and termination-only telephony applications
> like
> voicemail, IVR, conferencing, etc.) or bidirectionally.
>
>> If we go with a Zapata T1 card for the Asterisk server would we be
> able
>> to provision an analog phone line, for say a FAX machine from it?
>
>    No, not if the card doesn't have FXS ports on it.  But you could  
> get
> another Digium or Digiumlike card that does, even if it's just a
> single-port (like the hugely popular X100P, which is very inexpensive)
> and pull that off.
>
>    Let me know what else we can answer, or if I substantially
> misunderstood
> your question.
>
> Good luck,
>
> -- Alex
>
> --
> Alex Balashov <sasha at presidium.org>
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