kev@voder.UUCP (06/15/87)
Can someone give me the specifications of the filters needed in a
2400 baud modem? What are the frequencies of concern, the attenuation rates
needed, and anything else I might need to know concerning such filters?
Thank you.
Kevin
(P.S. Is there a printed spec that anyone can tell me about?)mw3s+@andrew.cmu.edu (Martin Weiss) (07/22/87)
I assume you are referring to the 2400 baud dialup standard, V.22bis. There is another, used primarily in France, called V.26ter that makes use of echo cancellation. These spec's are available from the Department of Commerce (Springfield, Va.) or from Omnicom, Inc. (Vienna, Va.), and are contained in the CCITT Red Book. You only need to order the book for Study Group XVII, which is concerned with modem standards. This book contains the full text, in English of all of the current CCITT standards (except V.33, a 14.4 kbps leased line standard). It will set you back about $25.00. I don't have the detailed addresses handy right now, but can get them if you need them.