IBM 7852 Model 400 External Data/Fax Modem

The External V.34 Data/Fax Modem is a high-performance, high-function modem designed for commercial and server applications. It features data transmission speeds up to 33.6 Kbps, fax speeds up to 14.4 Kbps, full synchronous command support, 2-wire leased line support with Switched Network Backup, hardware password protection, and remote configuration.

  • Modem Modulation
    • ITU-T: V.34, V.32bis, V.32, V.22bis, V.22, V.23, V.21
    • Bell: 212A, 103
    • Speeds: 28.8K, 26.4K, 24.0K, 21.0K, 19.2K, 16.8K 14.4K, 12.0K, 9.6K, 7.2K, 4.8K, 2.4K, 0-300 bps
    • Speeds for 7852-400 only; 33.6K and 31.2K
    • Error Control: V.42
    • Data Compression: V.42bis or MNP 5
    • Commands: AT(R) (Asynchronous) and V.25bis (Asynchronous and Synchronous)
  • Fax Modulation
    • ITU-T: V.17, V.29
    • Speeds: 14.4K, 9.6K, 4.8K
    • Format: T.4 compressed bitmap
    • Handshake: T.30
    • Commands: EIA TR.29 Class 2
  • Interface
    • RS-232 C/D DB-25F connector
    • Two RJ11Fs for dial-up and phone connection
    • One RJ45 for two-wire leased line connection

Complete in original box with power supply, installation guide, and technical reference.

Date : Unknown

Manufacturer : IBM

Format : Modem

This exhibit has a reference ID of CH36784. Please quote this reference ID in any communication with the Centre for Computing History.

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