7 Dec
1998
7 Dec
'98
4:39 p.m.
At 10:28 PM 12/7/98 -0800, Sellam wrote:
Me & Eric Smith were just going over this trying to figure out whether or
not we needed one for the original DC Hayes S100 modem card. The DAA was
basically a device that converted the digital signals coming off the card
into analog tones. You could only get this from Bell back in the day and
you had to pay dearly for it.
Quote from 'Independance Day' (I love a good 'blow-things-up' movie!):
"That's not entirely accurate..." B^}
There was no conversion of digital to analog done in the DAA. Specifically
in the case of the Hayes for example, the (analog) audio modulation was
done in the cute orange blob on the board. The only digital signals coming
off the board drove the relay in the DAA box for acquiring the line and
pulse dialing. Beyond that, the DAA provided 'protection' and
coupling/limiting of the analog signals from the board to the phone line.
The plexi-glass covered box that comes with the Hayes
Micromodem ][ is a
DAA.
Yep...
-jim
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jimw(a)agora.rdrop.com
The Computer Garage - http://www.rdrop.com/~jimw
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