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3825-A2-GB30-20
November 1996
Introduction
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3825Plus Modem Front Panel and Status Indicators
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Overview
The 3825Plus modem is a member of the
COMSPHERE 3800 Series Modem product line. The
3825Plus is a high-speed dial modem that offers reliable
asynchronous and synchronous operation over dial- or
two-wire leased-line networks. The 3825Plus modem’s
software defineability allows you to add enhancements
and new features as they become available, with no
further investment in hardware, no on-site personnel, and
minimal downtime.
High-speed data transfer and reliable throughput at
data rates as high as 33,600 bps over dial lines is made
possible by employing the latest techniques in modem
modulations, and using CCITT V.42bis/MNP Class 5 data
compression and CCITT V.42/MNP error correction. In
addition to fast line speeds, the modem can send data to
the DTE at speeds as high as 115,200 bps.
The modem’s compatibility with a number of dialing
methods and protocols, such as asynchronous
AT
commands and CCITT V.25bis dialing, permits
the 3825Plus to be used in a variety of applications and
environments while also allowing control over modem
configuration, dialing, and diagnostics. The modem offers
two preset factory configurations containing the most
often used modem settings. These factory presets provide
quick configuration for any asynchronous or UNIX
hardware-based dial environment.
Features
The 3825Plus modem has a wide variety of features,
including:
•
Dial-Line Modulations: Proprietary extensions of
V.34 (33,600 and 31,200 bps), ITU-T V.34 (up to
28,800 bps), V.32terbo (19,200 and 16,800 bps),
CCITT V.32bis (up to 14,400 bps), V.32 (up to
9600 bps), V.22bis (2400 bps), V.22 (1200 bps),
V.21 (300 bps), Bell 212A (1200 bps), and
Bell 103J (300 bps).
•
Two-wire Leased-Line Modulations: Proprietary
extensions of V.34 (33,600 and 31,200 bps),
ITU-T V.34 (up to 28,800), V.32terbo (19,200 and
16,800 bps), V.32bis (14,400, 12,000, 9600, 7200,
and 4800 bps), V.32 (9600 and 4800 bps), and
V.22bis (2400 bps).
•
Class 1 and Class 2 Group III Fax modulations:
CCITT V.17 (14,400, 12,000, 9600, 7200 bps),
V.29 (9600, 7200 bps) and V.27ter (4800,
2400 bps).
•
Convenient migration to new or optional features
through software downloading.
•
CCITT V.42bis and MNP Class 5 data
compression.
•
Virtual error-free data integrity with CCITT V.42
and MNP Levels 2– 4 error control.
•
Asynchronous dial DTE data rates from
300 bps–115,200 bps.
•
Enhanced Throughput Cellular (ETC), which
improves reliability and speed over cellular links.
•
Compatibility with the industry de facto standard
AT Command set.
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