The Aztech Systems Ltd. Modem Card MDP3999V-U(B)

Specifications:

Model: MDP3999V-U(B)

Type: Internal PCI Modem

Data Rate: 56 Kbps (0.056 Mbps)

Interface: PCI

Fax Compatibility: Group 3, Class 1

Power Requirements: 5V DC

Dimensions: Standard PCI card size

Operating Systems Supported: Windows 95, 98, Me, NT 4.0, 2000

Standards Supported:

ITU-T V.90: Allows modems to achieve download speeds up to 56 Kbps.

ITU-T V.92: An enhancement of V.90, offering faster connection times and improved upload speeds.

K56flex: A standard developed by Rockwell and Lucent Technologies, allowing speeds up to 56 Kbps.

x2: Developed by U.S. Robotics, also supporting speeds up to 56 Kbps.

V.42: Error correction protocol that ensures data integrity during transmission.

V.42bis: Data compression protocol that increases effective data throughput.

MNP (Microcom Networking Protocol): A series of protocols (MNP 2-4 for error correction, MNP 5 for data compression) used to improve modem performance.

Interesting Facts:

Legacy Technology: The Aztech MDP3999V-U(B) is a dial-up modem, a technology that was widely used before the advent of broadband internet. It connects to the internet via a telephone line.

Vintage Appeal: This modem is considered vintage hardware and is often sought after by collectors and enthusiasts of retro computing.

Combo Cards: Aztech also produced combo cards that combined modem functionality with sound cards, which were popular in the 1990s for saving expansion slots in PCs.