History
Initially there were two rival 56k modem systems. One was K56flex from Rockwell and Lucent. The other was X2 from USRobotics. In February 1998 the International Telecommunication Union (ITU) drafted a 56 kbit/s standard called V.90 which was carefully designed to allow both types of modem to be converted to it by a firmware upgrade. This was formally approved during September 1998.
Read more about this topic: 56 Kbit/s Modem
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