Subject: 31. What's a digital modem board, and how does it work?
Digital modem boards are available for the Pipeline 400 and MAX; the
MAX supports both v.34 (28.8Kbps) and v.32bis (14.4Kbps), while the
P400 can only use the latter. Each board has eight modems, and they
are essentially "real modems", taking the digital signal and shunting
it through a little D/A-converter and back again, simulating the
local loop you would have to your phone company if you were running
analog modems.
Digital modems can be used to answer calls only, not make them
(as far as I know).
A note on the P-400 support for digital modems, from
Marc Newman:
> 400T's can have 8 modems, 400B's can have only 4. On the 400B you
> cannot use 1 B channel for ISDN and the other for a modem call. The
> modem call seems to block both channels.
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