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1-13920-A2-GN31-30 November 1996
Introduction
Overview 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
COMSPHERE 392xPlus Models 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model 3920Plus Standalone Singleport Modem 1-2. . . . . . . . . . . . . . . . . . .
Model 3920Plus Standalone Multiport Modem 1-2. . . . . . . . . . . . . . . . . . . .
Model 3921Plus Carrier-Mounted Singleport Modem 1-4. . . . . . . . . . . . . .
Model 3921Plus Carrier-Mounted Multiport Modem 1-4. . . . . . . . . . . . . . .
392xPlus Operational Modes 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
392xPlus Features 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
392xPlus Singleport Features 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
392xPlus Multiport Features 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Applications 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Multipoint 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dual-Leased Backup 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MSD 1-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Digital Bridge 1-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
V.34 Modulation 1-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Multiport Backup 1-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Government Requirements and Equipment Return 1-11. . . . . . . . . . . . . . . . . . . .
United States 1-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Canada 1-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Specifications 1-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview
The COMSPHEREr 392xPlus modems are full-feature, high-speed leased modems, providing
reliable asynchronous and synchronous operation over leased or dial lines networks with data rates
as high as 33,600 bps.
Through downloading capability, any 392xPlus modem is upgradable to the latest firmware,
requiring no new hardware investment or on-site personnel, with little or no downtime (refer to
Chapter 3,
DCP Operations,
for more information regarding downloading options). The 392xPlus
modems support a wide range of modulation schemes and offer control using either AT commands,
the diagnostic control panel (DCP) or the optional COMSPHERE 6700 and 6800 Series Network
Management Systems (NMS). The NMS performs extensive monitoring, testing, reporting, and
restoral functions to assist in managing your network.
The 392xPlus
modems are compatible with a number of dialing methods and protocols, such as
asynchronous A
T commands, CCITT V
.25bis dialing, and the DCP
. The DCP allows you to use the
392xPlus modem in a variety of applications and environments while also providing control over
modem configuration, dialing, and diagnostics. The 392xPlus modems come with preset factory
configurations that are the most often used modem settings.
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