Check the listing for details. Conexant RD01-D850 56K V.92 PCI Data Fax Modem Internal for Desktop PC. Condition: Used. Listed at 2.00 USD. Conexant RD01-D850 56K V.92 PCI Data Fax Modem Internal for Desktop PC. Condition is "Used". Shipped with USPS First Class. This is a working internal desktop 56K analog modem for a standard phone line. Up to 14.4K fax speed. One jack connects to the phone jack with a standard phone cord, the other can be connected to a desk phone so that the same connection can be used by the phone and the modem (one at a time). Requires PCI slot (not PCI Express). Specifications: Transmission Line: Analog Interface: PCI Downstream Speed: 56 Kbps Maximum Fax Transfer Rate: 14.4 Kbps Enclosure: Internal Analog Modulation Protocol: ITU V.34, ITU V.90, ITU V.92 Maximum Fax Transfer Rate: 14.4 Kbps Error Correction Protocol: MNP-4, MNP-3, MNP-2 Data / Fax / Voice Compression: ITU V.42bis, MNP-5