3Com OfficeConnect 3C892A, User Manual, Page: 17 / 130

1
I
NTRODUCTION
This chapter provides an overview of the OfficeConnect ® ISDN LAN Modem,
referred to throughout this document as the ISDN LAN Modem. These instructions
apply to the international version of the product and cover both hardware
variations, ISDN U (3C892) and S/T (3C891).
Introduction
The ISDN LAN Modem is an easy to install, LAN to WAN modem. For the LAN, it
provides four 10BASE-T Ethernet connections— expandable to 25 connections.
Refer to Figure 1
for an example showing 10 connections by adding an 8-port
10BASE-T Ethernet hub. For WAN access, it provides a Basic Rate Interface (BRI)
ISDN port.
With the ISDN LAN Modem, small office and home office users can share remote
access to the Internet or to a remote office while continuing to network locally.
Applications
The primary application for the ISDN LAN Modem is:
■
Local networking with shared access to the Internet and/or a remote office
LAN.
Local Networking with
Access to the Internet
Users can share access to the Internet while continuing to network locally.
Figure 1
Local Networking with Access to the Internet
OfficeConnect ®
ISDN LAN Modem
Public telephone
network
Internet/Intranet
or
online service
ISDN BRI line
OfficeConnect™
ISDN LAN Modem
OfficeConnect
®
Hub 8 TPO
Alert
PWR COLL PKT COAX 1 2 3 4
green = link OK, off = link fail, yellow = partition
Port Status
5 6 7 8
1% 2% 3% 6% 12% 25% 50% 80%
Network Utilization Office
Connect¤
Hub
3 Com
PWR ISDN B1 B2
3 Com
Alert Tx Coll 1 2 3 4
LAN STATUS