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A proprietary modem standard developed by US Robotics for 56 kbps communications. Not taken up as widely as K56flex and will shortly be superseded by the official V.90 standard.
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An ITU standard (1998) for an analog modem that communicates at 56 Kbps downstream and 33.6 Kbps upstream. It was designed for ISPs and online services that are digitally attached to the telephone system via T1 and T3 circuits.

In practice, the downstream link is not faster than 45 Kbps in these PCM modems, so called because they use pulse code modulation downstream and standard V.34 upstream. Initially, two incompatible technologies competed in this arena: x2 from U.S. Robotics and K56Flex from Rockwell and Lucent. Such modems can be upgraded to V.90 if they contain software-upgradable memory chips. See V.92, V.34 and channel bonding.
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References in periodicals archive ?
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x-2, South Eugene (Applegate, DeHaas, Bunting, Wiebe), 49.87.
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