... USB Fax Modem, Fully Complies with ITU V9.2/K56Flex 5,600bps Transmission Protocol Product description56K USB Modem, offers ... (33.6Kbps) protocol standardsFeaturesComply with external USB 56K Modem, supports hot plug and can be used by ... , V.23 , V.21 , Bell212A , and 103 Fax protocol: V.17, V.29, V.27ter and V. ... 21 channel 2 fax protocol, fax speed up to 14,400bps Data error correct ...