Re: (ASCEND) TNT HDLC/modem resource allocation

[Matt Holdrege <matt@ascend.com>]

At 07:20 PM 3/6/99 -0600, Scott Kozicki wrote:
>Peter,
>
>I know this doesn't answer your question directly, but it is somewhat
>related. There are serious issues with the algorhythm that Ascend uses to
>allocate HDLC resources. 
>
>We came across ours when you attempt to do nailed T1's on a DS3 hub using
>the channelized DS3 card for the TNT. There are no Spider chips on the CT3
>card, so it uses HDLC resources from an HA-192 card (the HDLC card). Since
>there are only 6 Spider chips on the card, each handling a total of 30 HDLC
>(read: DS0) resources, then you can only have 6 nailed T1's up on the CT3
>card. Kinda stupid.

The T3 card is mainly for dial-in rather than nailed lines. We have loads
of these working fine in the field for dial-in.

>Think you're safe using a Frame Line 10 card, which has it's own HDLC
>resources on it (just like your modem card)??? Think again. The algorhythm
>basically chews up resources throughout the box, but doesn't ever report
>what's actually going on. We had down circuits that were coming in on FL10
>cards because of this problem, even though there were *PLENTY* of free HDLC
>resources throughout the box. The only solution was to bounce the box,
>bring up connections step by step, and use call routing to make sure PRI
>based calls were hitting specific HDLC resources and nailed connections
>used others.

This sounds like a config issue. If config'd right, your nailed T1's on the
FL10 shouldn't need to grab HDLC resources from other cards. Please work
with the TAC or your SE on this.

>I wanted to mention this to the list because if you're thinking of using
>DS3 hubbing to save some money - DON'T USE THE CT3 CARD! Buy an M13 box and
>break the T1's down onto FL10 cards. You'll still prolly need an HDLC card
>for PRI based calls, and to have some 'spare' resources just in case the
>box gets heavily utilized.

If you're talking about nailed T1's then I might agree. If you're talking
about dial-in, the CT3 card is the best choice.

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