US Robotics Sportster 33.6K External FaxModem 33600 Bps Serial DB25 RJ-11

US Robotics Sportster 33.6K External FaxModem 33600 Bps Serial DB25 RJ-11

The US Robotics Sportster 33.6K is an external dial-up fax modem connecting via a DB25 serial port to a host computer and a standard RJ-11 jack to an analog phone line. Operating at up to 33,600 bps, it supports both data and fax transmission over the public switched telephone network (PSTN). This unit does not include an AC power adapter.

Specifications & What's Included

• Brand: US Robotics
• Product Line: Sportster
• Maximum Data Rate: 33.6 Kbps (33,600 bps)
• Modem Type: External dial-up analog fax modem
• Host Interface: DB25 serial (RS-232)
• Phone Line Connector: RJ-11 (two jacks visible — line in and phone passthrough)
• Power: DC barrel jack (AC adapter NOT included)
• Form Factor: External desktop unit
• Fax Capable: Yes
• What's Included: Modem unit only — no AC adapter, no serial cable, no documentation

Applications

The US Robotics Sportster line was one of the best-selling external modem series of the mid-to-late 1990s, widely used in homes and small offices for dial-up internet access, bulletin board system (BBS) connections, and PC-based faxing. External modems of this type connected between a PC's serial port and a standard analog phone line, handling the analog-to-digital conversion and call negotiation that allowed data communication over the voice telephone network. The Sportster 33.6K dates from the mid-1990s era when 33.6K was the practical ceiling for analog dial-up — just before 56K V.90 modems became the new standard around 1998. Today these units are sought by vintage computing enthusiasts, hobbyists maintaining legacy systems, and anyone needing an analog modem for a serial-port-equipped machine or industrial/embedded controller that requires dial-up or fax capability over an analog line.