3Com DIGITAL MODEM User Manual page 10

1-2 C 1: I
HAPTER
The 3Com Impact ISDN External Digital Modem (referred to as
the 3Com Impact digital modem throughout this guide) is an
external, stand-alone ISDN Basic Rate digital modem for
connection with digital telephone services from local telephone
companies in North America. It is designed for users who
require high-speed access to the Internet, on-line information
services, or their corporate local area network (LAN). A typical
3Com Impact digital modem application is shown in Figure 1-1.
ISDN line
Figure 1-1 Analog and Digital Network Access with the 3Com Impact
Digital Modem
Four models of the 3Com Impact digital modem are sold in
the U.S. and Canada:
3C871 is the IBM
modem product.
3C872 is the IBM or IBM-compatible PC external digital
modem product with an internal 14.4 Kbps analog fax
modem.
3C876 is the Apple
product.
3C877 is the Apple Macintosh external digital modem
product with an internal 14.4 Kbps analog fax modem.
NTRODUCTION
3Com Impact
ISDN External
Digital Modem
Im pa ct ™
3 Co m
®
Public telephone
Analog or ISDN line
â
or IBM-compatible PC external digital
â
network
â
Macintosh external digital modem
Internet
or
on-line service
Analog or ISDN line
Corporate
LAN