Dave_Ninjajr_Flory@cup.portal.com (08/08/89)
I would really like to what carrier frequency the standard 1200, 2400, and 9600 baud modems us. Also what phase amplitude changes they use and thier bit number, etc. and what ever anyone knows about TCM. Trellis Code modulation error checking. (How does it work.) Thanks for your time. Anything else I should know?
die@cpoint.UUCP (David I. Emery) (08/11/89)
In article <21117@cup.portal.com> Dave_Ninjajr_Flory@cup.portal.com writes: >I would really like to what carrier frequency the standard 1200, 2400, and >9600 baud modems us. Also what phase amplitude changes they use and thier >bit number, etc. and what ever anyone knows about TCM. Trellis Code modulation >error checking. (How does it work.) The best reference for this that I know of is the CCITT standards documents (the so called Red Books). These contain precise and specific definitions of the standards for all the internationally standardized modem modulations. Proprietary modem formats (such as Trailblazer PEP) are hard to find documentation for, reverse engineering is usually needed to figure it out. The Red books are available through a couple of US companies but are not cheap. If you have access to a serious technical library you might be able to find copies there. -- David I. Emery Clearpoint Research Corp. 35 Parkwood Dr, Hopkinton Ma. 01748 1-508-435-7462 {decvax, cybvax0, mirror}!frog!cpoint!die {m2c}!jjmhome!cpoint!die