jon_sree@world.std.com (Jon Sreekanth) (02/26/91)
In article <telecom11.153.12@eecs.nwu.edu> fmsys!macy@ usenet.ins.cwru.edu (Macy Hallock) writes: > Seriously, there used to be FCC approved units for this purpose > around. I think they were used in answering machines extensively at > one time. I recall seeing an ad for FCC registered line isolation > modules for incorporation into equipment not too long ago. I assume you're talking about Data Access Arrangements (DAA's) ? I know of only two manufacturers, Cermetek and Dallas Semi. Dallas had a SIMM module that was supposed to go with their modem, so other modem manufacturers might make some similar DAA. Cermetek has a whole line of DAA's, with DIP-like packages. Why are these DAA's so expensive ? For one of the FCC/CSA listed units from Cermetek, I was quoted in the $50 range. One can buy a whole PC 2400 baud modem card for about that much, and that modem card has the circuitry this DAA has (ring detect, isolation, 2-4 hybrid) and much more. One can buy a phone for $15. Is it just a small niche market, and Cermetek is the only one interested in being in it, and hence they can charge any price they want ? Or am I missing something ? Regards, Jon Sreekanth Assabet Valley Microsystems Fax and PC products 346 Lincoln St #722, Marlboro, MA 01752 508-562-0722 jon_sree@world.std.com