1-4 CHAPTER 1: INTRODUCTION
Data Capabilities
The 3Com Impact digital modem allows transmission of
asynchronous data at speeds of up to 115.2 Kbps over digital
ISDN connections with the highest reliability and error-free
performance possible. With Multilink PPP, a digital connection
of up to 128 Kbps can be established by aggregating the two
56 Kbps or 64 Kbps ISDN B channels. Note that the COM port
speed of your PC limits the maximum data transmission rate to
no more than 115.2 Kbps.
ISDN technology reduces call setup times by more than 50%
compared to V. fast/V.34 analog modem setup times,
reducing the time it takes to establish a connection to under
three seconds.
This high-speed performance allows you to do the following:
■Dial up the Internet at high data rates
■Access your office’s LAN
■Access and download graphics, software, and data files more
quickly
Voice Capabilities
The 3Com Impact digital modem’s Phone Out port allows the
use of existing analog telephone equipment (touch-tone
telephones, cordless telephones, and fax and answering
machines) to place and receive calls over the ISDN line. When
you connect to another ISDN line, setup times are reduced,
and voice quality is excellent.
Simultaneous Data and Voice Capabilities
The 3Com Impact digital modem quickly processes data and
voice calls simultaneously. For example, you can send a fax or
place a voice telephone call while maintaining a high-speed
connection to the office LAN; you can also receive a voice
telephone call while you are connected to the Internet.