There is no way to be sure other than to try it. If the lines are very poor,
you will never get a PCM protocol to work. There are a great many things
that can stop PCM modems from connecting.
On the other hand, PCM is a very different protocol from V.34 and there are
many cases were people who couldn't get 33.6K, but only 28.8K or 31.2K, get
much higher speeds with the new modems.
-MZ
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