Basic HTML version of Foils prepared Dec. 6 98

Foil 10 56 Kbps modem technology (1)

From Introduction to Network WANs Lectures at Xi'an Jaotong University -- Sept 1998. by Roman Markowski
1 asymmetrical : 56 Kbps (downstream); 33.6 Kbps (upstream)
2 ITU V.90 - standard covering 56 Kbps modems (will be probably ratified in September 1998). At the moment there are 2 proprietary and incompatible specifications: X2, developed by US Robotics, and K56flex by Lucent and Rockwell Semiconductors Systems.
3 about 70% of the 56K modems use K56flex technology. Recently 28 data communications and computer vendors created Open 56K Forum which intends to push K56flex technology as new standard.
4 Cost: $129-$500
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