K56Flex: Rockwell Corporation's K56Flex modem chipset gave users the capability to receive data on ordinary phone lines at 56 Kbps (thousand bits per second). K56Flex was similar in capability to US Robotics' x2 modem and transmission technology. K56Flex and X2 contributed to and were replaced by the ITU V.90 standard. Modems built with K56Flex can be upgraded to the V.90 standard by getting a software update from the modem manufacturer. (Note that Rockwell does not build modems itself, but only the chipsets for them.) Conexant, a Rockwell subsidiary company, now builds V.90 chipsets.
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