[asterisk-users] bandwidth required for Asterisk running on T1

[Chris Brentano]

Additionally Mark, a Channelized (also called Integrated) T1 offers 24 
channels for voice/data, but after bit robbing (for signalling, etc) you 
only get around 56kbps per channel. ISDN PRI over T1 has 23 b-channels 
of voice/data and one d-channel for signalling, etc. PRI is preferred 
and most common. And of course, ISDN PRI over E1 gets 30 channels of 
voice/data and 2 channels for signalling.



Jared Smith wrote:
> On Fri, 2008-04-11 at 01:18 -0700, mark morreny wrote:
>   
>> The T1 is  32 x 64Kbps channels ; Codec is GSM.
>>     
>
> That's incorrect... a T1 is 24 channels, and each channel is 64kbps.
> There are also a few extra bits for framing, which adds up to 1.544
> megabits per second in each direction.  The audio comes across a T1 as
> G.711 (not GSM as stated above), and on a T1 it's usually using ulaw
> companding.
>
> An E1 is 32 channels, and each channel is the same 64kbps.  This adds up
> to 2.048 megabits per second.  Again, the audio is in G.711 format, but
> alaw companding is typically used on an E1.
>
> --
> Jared Smith
> Community Relations Manager
> Digium, Inc.
>
>
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