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

[Andrew Latham]

On Tue, Dec 8, 2009 at 2:58 PM, Kevin P. Fleming <kpfleming at digium.com> wrote:
> Andrew Latham wrote:
>
>> and an example of my first thoughts:
>>
>> bchan=1-15
>> dchan=16
>> bchan=17-31
>> uchan=32
>
> Well, you've missed an important point: the DAHDI drivers for E1 cards
> would have to be modified to make this 32nd channel in each span
> actually exist, before any configuration in chan_dahdi.conf would be
> relevant.

I did think of that but my fingers totally forgot to put it in the email. ;)
I shall assume it is either really hard or really easy to change this.

>
> If that was done, there wouldn't actually be any changes required in
> chan_dahdi.conf at all; if you wished to, you could put in a comment for
> each 32nd channel to indicate that you are intentionally skipping it,
> but there is no need to make chan_dahdi actually aware of that channel
> at all.

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.

How would the current DAHDI act if B-Channels existed at channel 32.
Does it just skip them _because_ it is an E1 or does it see the
channel and skip it.


My apologies, its a holiday here and I am catching up with my email.
This topic was in my email.

>
> --
> Kevin P. Fleming
> Digium, Inc. | Director of Software Technologies
> 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
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