Hello David!

Wednesday February 12 1997 18:31, David Drummond wrote to Steven Anderson:

 SA>>> Its also FULL DUPLEX (not like X2) and works on normal
 > How can that be so?  If the line's bandwith won't support 33,600 how would
 > it support 56K?

 > I would suggest that if you don't ever see 33600, you'll never see 56000
 > either.

My understanding, from reading the technical information posted here several
months ago, is that the modulation scheme used for 56k (X2 at least, and
presumably K56Flex as well) is completely different than those used for
V.34 and previous schemes, and relies on the properties of the PCM digital
encoding used on the digital network. The design requires that every stage
except the end user's local loop be digital, which should have decent
bandwidth indeed.

Steven was originally talking about 43k (traditional encoding) though,
which would indeed be much less likely to work on a line which 33.6k won't
work on, unless the modulation scheme squeezes things into more bandwidth
somehow.


Regards,
Hamish

--- GoldED/P32 2.42.G1219+