Conexant CX93010-21Z is a USB modem controller designed for external 56K dial-up and fax modems. It supports the V.92 and V.90 modem standards, providing data transfer rates of up to 56 Kbps downstream and 36.6 Kbps upstream. The chipset also supports fax transmission and reception at speeds up to 14.4 Kbps. Additional features include V.44 and V.42bis data compression, error correction, and modem-on-hold functionality. The CX93010-21Z is commonly found in USB telephone modems, including adapters manufactured by StarTech.com and other third-party vendors. It connects to a computer through a USB interface and uses an RJ-11 telephone connection for dial-up communication. The chipset is designed to support legacy modem applications, fax software, and systems requiring traditional telephone-line connectivity.
