Re: (ASCEND) TNT HDLC/modem resource allocation

[Matt Holdrege <matt@ascend.com>]

At 11:09 AM 3/5/99 -0800, Peter Lalor wrote:
>We have a TNT with an HDLC card and a Series II modem card, which also has
>HDLC processors in it. The Series II modem card can handle 48 modem or ISDN
>calls, in any mix, but no more than 48.
>
>When I set call-routing-sort-method and digital-call-routing-sort-method to
>item-first, the TNT uses up the HDLC processors on the modem card first,
>which causes us to run out of modems while having excessive free HDLC
>processors.

From one of our TNT support people...

The call routing algorithms that can be applied to digital and analog calls
are the same.  However, the defaults are reversed.

From the System Profile:
 Parameter - call-routing-sort-method:
  How to sort the Call Routing table for analog calls.
 Parameter - digital-call-routing-sort-method:
  How to sort the Call Routing table for digital calls.

  Enumerated field, values:
   Analog Default:
    item-first:  Sort by item number, then shelf and slot number. Tends to
       distribute incoming calls evenly across multiple host cards.
   Digital Default:
    slot-first:  Sort by shelf and slot number, then item number. Tends to
       concentrate incoming calls on one host card at a time.

By following the above rules, putting the HDLC card(s) above the CSM3
card(s) in the first TNT Shelf and setting the SYSTEM Profile parameter
DIGITAL-CALL-ROUTING-SORT-METHOD equal to SLOT-FIRST the calls 'should'
fill the HDLC card(s) before incoming digital calls roll over to a CSM3.  I
use the word 'should' only because I've not tried this in the lab.

I would leave the SYSTEM Profile parameter CALL-ROUTING-SORT-METHOD equal
to ITEM-FIRST.  This would then allow the distribution of modem calls
somewhat equally across all modem cards.

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