HAWKING PN580U Data/Fax Modem 56Kbps USB V.90 (down-stream up to 56,000 bps). V.34bis, V.32bis, V.32, V.22bis, V.23, V.22, V.21 Error Correction Protocol V.42 and MNP Class 2 to 4 Data Compression Protocol
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U.S. Robotics Courier Usr3453c Analog Modem . Serial . 1 X Rj. 11 Modem . 56 Kbps "Product Type: Modems/Analog Modems" : Electronics - Amazon.com