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Re: (ASCEND) NFAS examples?

>From: "Michael Johnson" <mjohnson@ou.edu>
>I've orded 11 PRI's, two with D-channels (the first and the last for primary
>and backup).

<snip>

>My allocation of the interfaces on the two 8-port t1 cards:
>Slot 1:
>T1 { 1 1 1 }    1-23 B
>                  24 D (primary D)
>T1 { 1 1 2 }    1-24 B
>T1 { 1 1 3 }    1-24 B
>T1 { 1 1 4 }    1-24 B
>T1 { 1 1 5 }    1-24 B
>T1 { 1 1 6 }    1-24 B
>T1 { 1 1 7 }    1-24 B
>T1 { 1 1 8 }    1-24 B
>Slot 2:
>T1 { 1 2 1 }    1-24 B
>T1 { 1 2 2 }    1-24 B
>T1 { 1 2 3 }       1 B
>                2-23 unused
>                  24 D (secondary/backup D)

<snip>

>Any suggestions on the design, does it sound sane?

I don't think NFAS groups can span T1 cards. They didn't used to be able
to, and according to the 2.0.0 docs:

"ISDN-NFAS specifies Non-Facility Associated Signaling (NFAS). NFAS enables
a group of T1 lines on the SAME card to share a D channel. All NFAS lines
that share a D channel must use the same NFAS group ID.
You must configure one of the lines to provide the primary D channel and
secondary (backup) D channel. "

If that's still true in current releases, you'll need to have a primary
(and secondary if you choose to run secondary) D channel for each NFAS
group, one group per card.

Perhaps someone at Ascend can confirm this?

>Does using NFAS affect the "trunk-group" settings?  If so, how?

No. It's still one trunk group for your situation.

>What settings do I need for nfas-group-id and nfas-id to do what I need?

Your first T1 card's PRIs will all be nfas-group 1. The second will all be
nfas-group 2.

nfas-id is the order of the T1s, so you'll just start at 0 and go up. You'
start at 0 again on the second T1 card.

>I will have only one phone number for the entire modempool, do I need this
>number in all of the "phone-number" settings so that each channel will be
>able to answer this line?

No.

>The "secondary" D channel is the "backup" D channel correct?  I've heard it
>both ways and just want clarification.  My understanding is that the backup
>D is not used unless the primary D goes down?

Correct.

>Do I need to specify any call-routing options?

No.

Peter Lalor           Infoasis
plalor@infoasis.com   http://www.infoasis.com/
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