We have a pair of IGX 8420s connected over a NTM E1 trunk. Over this trunk several 24-channel UVM connections are routed. Each 24-channel connection uses up approx 700packets/sec using g729ar8v compression.
We are trying to switch the E1 trunk to a UXM card. When we do this, the number of packets/sec by a 24 channel UVM connection remains the same value ie 700 packets/sec. This is unexpected since we expect each UVM connections usage to drop by about 50% (to about 350cps) since a ATM cell is 53 bytes and FP cell is 20 bytes.
Moreover, existing data/fr connections behave as expected. On a NTM trunk a 300K fr connection uses approx 1500fps while on a UXM trunk that drops to about 786cps.
Is there something I am missing regarding the UVM connections? Is this value configurable somewhere?
Thank you for that link. I will be attempting that today. I see the default value for voice is set to 2 (*125). Is this pretty much a trial and error setting (trying values from 3 to 255) or is there a magic value that makes us get 2 Fastpackets per ATM cell?
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