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1-13910-A2-GN32-40 September 1998
Introduction
Overview
The COMSPHERE 391x Series modems, a new generation of full-feature, high-speed modems,
offer reliable asynchronous and synchronous operation over leased-line or dial networks. The 391x
Series modems’ unique software defineability allows for the addition of future enhancements,
whether it is installing new features or firmware upgrades.
The modem’s compatibility with a number of dialing methods and protocols, such as asynchronous
AT commands, ITU-T V.25bis dialing, and the user-friendly diagnostic control panel (DCP),
permits the 391x Series modem to be used in a variety of applications and environments while also
allowing control over modem configuration, dialing, and diagnostics. The 391x Series modems
offer preset factory configurations containing the most often used modem settings.
Features
The 391x Series modems have a wide variety of features.
• Four-wire/two-wire point-to-point or four-wire multipoint operation.
• Four-wire/two-wire leased-line modulations: V.32terbo (19200 and 16800 bps), V.32bis
(14400, 12000, 9600, 7200, and 4800 bps), V.32 (9600 and 4800 bps), Paradyne
Point-to-Point Diagnostic (1200, 2400 bps), Trellis Multipoint (19200, 14400, 9600, 7200,
4800, and 2400 bps), V.22bis (2400 bps), V.27bis (4800 and 2400 bps), V.33 (14400 and
12000 bps), and V.29 (9600, 7200, and 4800 bps).
• Dial-line modulations: V.32terbo (19200 and 16800 bps), V.32bis (14400, 12000, 9600,
7200, and 4800 bps), V.32 (9600 and 4800 bps), Paradyne Point-to-Point Diagnostic (1200,
2400 bps), V.22bis (2400 bps), V.22 (1200 bps), V.23 (1200 and 600 bps), V.21
(300 bps), Bell 212A (1200 bps), and Bell 103J (300 bps).
• Channel adaptive Trellis-Coded Modulation, Paradyne’s advanced Trellis-Coded transparent
forward error correction for Trellis multipoint and high-speed point-to-point applications.
• Mixed inbound rates for multipoint applications.
• Convenient migration to new or optional features through software downloading.
• Extended data circuits with diagnostics.
• Network management system (NMS) support through the COMSPHERE 6800 or
6700 Series NMS using Advanced Diagnostic protocol (ADp).
• Complement of self-tests, local and remote loopbacks.
• ITU-T V.42bis and MNP Class 5 data compression.
• Virtual error free data integrity with ITU-T V.42 and MNP Level 4 error control.
• Dial access security.
• Automatic and manual backup with standby capabilities for 4-wire/2-wire leased-line
applications. (The backup facility may be either a 2-wire dial line or a 2-wire leased line.)
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