jalbers@BNL.ARPA (08/16/84)
I am looking for any and all information on 2400 baud modems for use
over Ma Bell lines between micros, micro to mini, or between mini's. I've seen
2400 baud modems adverrtized in places like BYTE that claim things like
'300/1200/2400 Hayes compatable with parcticly no line lossage at 2400 baud'.
Does this mean 2400 baud has some type of error check going on? How about these
new Ven-Tel modems that sport 'variable baud rates'? What exactly does this
mean to the user? Does the micro also have to support 'variable baud rates?'.
I really want to know all I can about the modems that operate above 1200 over
standard phone lines. What kind of 'protocols' do they have, how hard are they
to get running, what considerations the user has to make when ordering one, and
which one is the 'best buy'?
Jon (so many unanswered questions)
Albers
jalbers@bnljcp@BRL-TGR.ARPA (08/16/84)
From: Joe Pistritto <jcp@BRL-TGR.ARPA> I've seen two 2400 full duplex modems: An Anderson-Jacobsen (I forget the model #) - which works amazingly well over long distance lines, (better than Bell 212A!), and costs about $3K/pair. I saw these demonstrated about 7 months ago from Baltimore to New Jersey over long distance lines. It has a 1200 baud fallback mode for brain damaged connections The new Vadic Quad Modems, which have, all in one box: The new 2400 baud protocol (Vadic proprietary, I think) Vadic 3400 (the best 1200 baud protocol) Bell 212a (the other 1200 baud protocol) Bell 103a (300 baud) And will even auto-select, like the current series of triple modems. -JCP-