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RE: Voice over IP - performance
From: Bill Woodcock <woody () pch net>
Date: Wed, 12 Feb 2003 14:30:55 -0800 (PST)


    > I'm assuming in the case of, e.g., a 2650 + dual T-1 PRI interface
    > can actually encode/decode 48 simultaneous g729a voice streams
    > without issues?  Any idea what the CPU utilisation is - or is this
    > handled in separate DSPs in the voice network module itself?

It's all handled in the DSPs.  So if you look below at the cost difference
between a package that will handle 45 simultaneous calls (five SIMMs of
three DSPs each, each DSP can handle three simultaneous g729a streams) and
one that'll handle the full 46 (not 48 because you've got one D channel on
each PRI; it's unlikely that you'd want to sacrifice caller-ID), you wind
up having to toss out one of the three-DSP SIMMs and replace it with a
5-DSP SIMM, with some waste.


    > Package which can handle 45 simultaneous calls:
    > CISCO2650          10/100 Modular Router      $3,295
    > NM-HDV-2T1-48      Dual-Port T1 Voice NM      $9,800
    > Total                                        $13,095   $291
    >
    > Package which can handle 46 simultaneous calls:
    > CISCO2650          10/100 Modular Router      $3,295
    > NM-HDV-2T1-48      Dual-Port T1 Voice NM      $9,800
    > PVDM-256K-20HD     5-DSP Module (15 calls)    $4,000
    > Total                                        $17,095   $372

                                -Bill



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