[Asterisk-doc] Connecting to a PRI

[Stephen R. Darragh]

Mats Karlsson wrote:

>Jeff Gehlbach wrote:
>  
>
>>I can't comment on E1, but one slight correction on PRI channelization
>>terminology: the "D" designation of the signalling channel stands for
>>"delta", not "data".  The same applies for the 16Kbps "D" channel used
>>in BRI.
>>
>>I just joined the list, so I must have missed the balance of your
>>writing.  I would love to peruse, is it in CVS?
>>
>>-jeff
>>    
>>
>
>Gene just a minor correction:
>E1 is 32 channels not 31 as mentioned in the doc.
>
>And Jeff, the D channel is data and B is for bearer in the ISDN language.
>
>The D channel is used for signaling and data transfer like text messages
>between ISDN devices.
>
>So the doc is correct on this point.
>  
>

No, Jeff is correct - the D channel is the Delta channel.

You are, however, correct that there are 32 channels (or, more 
accurately, timeslots) for E1.  Typically TS0 is used for framing and 
synchronization, and TS16 is used for signalling.

-- 
Stephen Darragh
CTO
Informed Technology
Ph: +61 8 9380 4244  Fax: +61 8 9380 4354