Chuck, The information you are looking for is closly held by telecom consultants and engineers. To acquire a state of the artdesign will cost you the price of a contract. All of these designers have learned their trade in the trenchs and are not willing to give their knowledge away.
It takes a lot of effort to learn the idiocycracies required of EC designs. Which is still a moving target. A TBR 21 design is difficult at best, especially the holding circuit and 2W to 4W hybrid. I've been designing modems/DAA's for 28 years and have only seen reference designs published by the modem chip manufacturers (AT&T, Cirrus and Rockwell). All of them are North American DAA's. Basic designs that are a good start, but far from ideal. Designing a DAA to pass approvals is one thing, but designing one that passes approvals and has maximum modem performance is another. In the DAA design world there is no free lunch. Regards, Duane Marcroft Telecom Engineer and Consultant >From: "Chuck Derrow"<[email protected]> >Subject: DAA design documents > > >Hi, > >I am looking for a GOOD source of information on the design of a DAA. The >project is the design of a V.34 modem. It will be used in the EC and US as >well as South America. Any pointers to Books, or white papers would be >greatly appreciated. > >Thanks > >Chuck Derrow >Teradyne Telecommunications >[email protected] >847.941.6317
