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The 3Com Megahertz 56K Cellular Modem PC Card (model 3CXM556) is a vintage PCMCIA Type II modem designed for notebook computers, notable for its built-in XJACK® connector, which eliminates the need for external dongles or cables. This modem was popular in the late 1990s and early 2000s for mobile professionals requiring dial-up or cellular data connectivity. Technical Specifications Modem Standards: Supports V.90 (up to 56 Kbps download), x2, V.34+, V.32bis, V.22bis, and Bell 212A. Upload speeds are up to 31.2 Kbps, with FCC regulations limiting download speeds to 53 Kbps. Fax Support: 14.4 Kbps fax capability, compatible with ITU-T Group III standards. XJACK® Connector: A retractable RJ-11 jack built into the card, allowing direct connection to phone lines without external cables. Cellular Compatibility: Supports Direct-Connect Cellular with separately sold cables for various AMPS cellular phones, including models from Motorola, Nokia, Ericsson, and others. Flash DSP/ROM: Allows firmware updates via software downloads, ensuring compatibility with evolving standards. Digital Line Guard: Detects and alerts users when connecting to potentially damaging digital or PBX phone lines. Hot Swapping: Supports insertion and removal without rebooting the system. Operating System Compatibility: Compatible with Windows 3.1x, 95, 98, NT 4.0, 2000, DOS with Card and Socket Services 2.1 or higher, Macintosh System 7.5.5 or higher, and Linux.
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