The NM-HDV-1E1-30 has enough DSPs to support 30 channels of voice (i.e. 1 voice E1) using a low complexity codec. The NM-HDV-1E1-30E has enough DSPs to support 30 channels of voice using a high-complexity codec or 30 channels of voice using a low complexity codec AND transcoding/conferencing resources.
If you need to use a high-complexity codec and would like to use hardware based conferencing/transcoding, you will need to replace those PVDM-12s with PVDM-16 or -20s.
I would also add that the NM-HDV-1E1-30 with 3 PVDM-12s each capable of running 12 voice calls of low complexity, would also give the router additional transcoding/conferencing resources as well. Unless an entire PVDM-12 must be dedicated to either voice or transcoding/conferencing. Can you clarify?
The entire PVDM does not need to be dedicated, but I beleive each DSP must be dedicated for either voice encoding/decoding, transcoding, or conferencing. Ecoding/decoding 30 channels takes 8 DSPs (at 4 conversations per DSP). That leaves 1 DSP available for Transcoding or conferencing, so it would be possible to transcode 4 channels or create 1 conference bridge.
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