Introduction 1
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Multipoint Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Leased Backup Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
COMSPHERE 391x Series Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Standalone Model 3910 4-Wire/2-Wire Modem . . . . . . . . . . . . . . . . . . . . 1-3
Carrier-Mounted Model 3911 4-Wire/2-Wire Modem . . . . . . . . . . . . . . . 1-4
Government Requirements and Equipment Return . . . . . . . . . . . . . . . . . . . . 1-5
United States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Canada . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
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, CCITT 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.32 terbo (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.32 terbo (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.
