> that "construction" of the T1 is directly related to the line coding
>
> In order to support 56K on a T1, it has to be
>
> Binary 8 Substitution/ Extended Super Frame
>
> (B8ZS/ESF)
>
> ==> 64k clear channel
>
> AMI/D4 (i can't remember what this stands for)
>
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I think that most T1 lines are set for B8ZS with ESF. I also think that
channelized T1 (as opposed to PRI) uses robbed bit signalling (the so-called
A B bits) to indicate conditions such as on/off hook and ringing.
It is a form of in-band signalling.
How does this play into the picture?
Marc
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