3Com Impact Digital Modem Features
1-3
The 3Com Impact digital modem can be connected to any
compatible UL
â
-listed IBM AT
â
-compatible or Apple Macintosh
personal computer that includes instructions for the installation
of hardware and software options to serial ports.
The 3Com Impact digital modem provides the following:
■
A complete digital network termination (Basic Rate ISDN NT1).
■
Full ISDN signaling support of National ISDN and
pre-National ISDN service offerings.
■
An asynchronous RS-232-C data port for connectivity to IBM
or compatible PC and Apple Macintosh serial ports at rates of
up to 115.2 Kbps.
■
AT command set dialing.
■
Interoperability support through standard protocols like
Point-to-Point Protocol (PPP) and V.120. (V.120 is a rate
adaption scheme to convert transmission rates from a range
of 50 bps to 19.2 Kbps to the B channel 64 Kbps rate.)
■
Multilink PPP support, which allows the two B channels to be
virtually linked, thereby allowing a maximum digital
connection of 128 Kbps.
■
Dynamic bandwidth allocation (DBA), which allows you to
place a voice call while a Multilink PPP call is active.
■
Internal 14.4
Kbps analog fax modem (V.32
bis
compliant) for
connection to non-ISDN fax machines and modems (applies
to 3C872 and 3C877 models only).
■
An analog voice port for attaching analog telephones,
answering devices, and fax machines to the ISDN line.
■
A graphical user interface for digital modem configuration.
■A comprehensive diagnostic test and LED status display.
■One-year limited warranty within the “Other Hardware
Products” category of the 3Com Limited Warranty at the end
of this guide.