Hayes 5655US 56K DFV V1.20 Internal PCI Fax Modem Card V.90 V.34 RJ-11

Hayes 5655US 56K DFV V1.20 Internal PCI Fax Modem Card V.90 V.34 RJ-11

The Hayes 5655US is a 56K internal PCI fax modem card running firmware version V1.20. It supports the DFV (Data/Fax/Voice) standard and operates at up to 56 Kbps downstream using the V.90 protocol, with V.34 fallback compatibility. The card connects to a standard phone line and optional handset via two RJ-11 jacks on the rear bracket.

Specifications & What's Included

• Brand: Hayes
• Model: 5655US
• Firmware Version: V1.20
• Type: Internal PCI Fax Modem (DFV — Data/Fax/Voice)
• Maximum Data Rate: 56 Kbps (V.90)
• Modem Standards: V.90, V.34
• Bus Interface: PCI
• Connectors: Two RJ-11 jacks on rear bracket (Line and Phone)
• Main Chipset: Rockwell / Conexant controller (RCVDL56ACF/SP visible on PCB)
• Country of Manufacture: Mexico
• Certifications: UL Listed, FCC Compliant, Industry Canada (1133 8185 A)
• Included: Card only — no software, drivers, or documentation

Applications

Internal PCI fax modems like the Hayes 5655US were standard equipment in desktop PCs throughout the late 1990s and early 2000s, used for dial-up internet access, fax transmission, and voice capabilities over a standard PSTN telephone line. Hayes was one of the most recognized names in modem technology, and the AT command set Hayes developed became the industry standard that nearly every modem manufacturer adopted. The 5655US targets the V.90 56K generation — the final and fastest generation of dial-up modem technology before broadband displaced it. Today these cards still see use in legacy systems, industrial machines with dial-in remote access, fax-over-POTS applications, and point-of-sale or alarm systems that rely on PSTN dial-up connectivity. The PCI bus form factor is compatible with desktop systems from the late 1990s through mid-2000s that include standard PCI slots.