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PVDM-256K-20

I'm ordering several 1760-V routers to use as gateways. I see that the DSPs supported include PVDM-256K-20 or PVDM-256K-20HD. Both are 5 DSPs but what does the HD indicate? What is the difference?

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Re: PVDM-256K-20

Basically this PVDM-256K-20HD= is a Voice and Fax DSP Module to support 20 voice channels while

the PVDM-256K-20= is just a Voice DSP Module to support 20 voice channels, with no fax support.

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