Introduction - Lancom 1751 UMTS Manual

110584_LC-1751-UMTS-MANUAL-EN.book Page 9 Tuesday, February 26, 2008 5:16 PM

1 Introduction

Networked cooperation between several offices or even between continents
has become an everyday part of modern business. The paths of communica-
tion between headquarters, subsidiaries and field workers increasingly rely
upon public infrastructures. VPN has become established as the de facto stan-
dard for cost-effective and secure enterprise communications over the Inter-
net.
However, many of important elements in these network structures remain sus-
ceptible to failure which could have severe consequences for business opera-
tions:
BRANCH OFFICE
LAN VPN ROUTER
NTBA
LANCOM UMTS Routers of the type LANCOM 1751 UMTS are equipped with
a UMTS modem and an ISDN interface to offer two integrated options for
establishing alternative connections. The LCOS operating system provides a
range of security and backup functions to protect your multi-site network
from disturbances of this type.
1.1 Various backup strategies
1.1.1 Backup via mobile-telephony lines
Backup solutions that rely on ISDN or analog telephone lines are the most
common method used today to ensure high availability of data lines such as
those between branch offices and computer centers in large company net-
The Internet-access cable between the site and the provider
after damage from construction work, for example.
Provider's network may be disturbed or even fail.
ADSL
NETWORK
LANCOM 1751 UMTS
Chapter 1: Introduction
INTERNET
UMTS
ISDN
NETWORK
could fail;
HEADQUARTER
VPN GATEWAY SERVER
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