FTD%MIT-OZ@MIT-MC.ARPA ("David D. Story") (10/26/85)
212a being better is a lot of sh&t. Bell originally wouldn't sell their modems and in the lease package they billed the user on data phone rates. Bell also wouldn't give out their filter specs, sell them, or anything else which in turn created the pocket for Vadic. If you have noisy lines (and remember that this is recent history before all the line conditioning and that's where Bell put the data phones) the 3400 protocol is much better (cleaner). The 103 is coupled. And I don't think Vadic or Hayes Anderson (only around for 2? years for their licens) ever had an acoustic coupler running 3400. The HA uses their coupler for 103 only I believe. What remains to be seen is if Vadic comes out with harmonic 2400 modems that are cleaner that what is possibly already there. Maybe 4800 - 9600 ! Bell works on a feedback filter while Vadic works onharmonics. The Bell filter had to let some noise in their frequency range pass while the Vadic doesn't won't and never will. Preferable tkeep the creepy micro people of thmainfthere shouldn't exist a 103 or a 212a answer option strap so then stupid managers couldn't set up that way ! Cut those straps !
ron@BRL.ARPA (Ron Natalie) (10/28/85)
Sorry, but VADIC did make 3400 model accoustic couplers and they do work at 1200. We've got a whole pile of them around here. The only problem is all the new fangled phones don't have round receivers that can fit into the little rubber holes on the coupler