[asterisk-users] E1 Channel Numbering - Your Comments.

[Andrew Latham]

On Tue, Dec 8, 2009 at 4:01 PM, Kevin P. Fleming <kpfleming at digium.com> wrote:
> Andrew Latham wrote:
>
>> This is where my query lives...  What if...  Imagine 2+ E1s sharing
>> the first E1's D-channel for timing and some manufacturer thought
>> about selling some hardware that would allow the use of 32 channels on
>> the next E1 and so on.  So something like "dchan=16
>> bchan=1-15,17-31,32-63" could happen.
>
> The D-channels are not used for timing, the timing channels are. As far
> as I am aware (but my knowledge base is limited) the 32nd channel on an
> E1 cannot be used for data transfer under any circumstances.
>
> Please be sure you are not confusing the 32nd channel (used for timing)
> with the 16th channel (used as a D-channel for ISDN PRI usage). Asterisk
> already supports using all 31 available channels on an E1 as B-channels
> if the D-channel signaling is coming from a different span.

Yes we are on the same page here.  After some further reading I could
not find a single instance (other than data) which could use the 32nd
channel.  I see why the DAHDI (and Zaptel) software is the way it is.
The mistake I made was regarding a 32 Channel MUX which was 32
channels _of_ E1s...

So the 32nd channel in an E1 should never (knocks on wood) be used by
voice circuits.   Is the numbering alone worth changing DAHDI?
Probably not.  I can even imagine users wondering why they can't do
anything with this new magical 32nd channel.

Sorry for the waste of time.

>
> --
> Kevin P. Fleming
> Digium, Inc. | Director of Software Technologies
> 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
> skype: kpfleming | jabber: kpfleming at digium.com
> Check us out at www.digium.com & www.asterisk.org
>
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