Isdn/ - Lancom 1751 UMTS Manual

110584_LC-1751-UMTS-MANUAL-EN.book Page 10 Tuesday, February 26, 2008 5:16 PM
LANCOM 1751 UMTS
Chapter 1: Introduction
works. The standard Internet connection is typically provided via an inexpen-
sive DSL connection and a backup line in the form of an ISDN/analog line
takes up the data traffic if the normal line should be disturbed.
BRANCH OFFICE
LAN UMTS ROUTER
As an alternative to this ISDN/analog backup scenario, mobile telephony con-
nections can also be used to ensure the availability of data connections. If an
Internet connection is operated via a LANCOM 1751 UMTS, then any interrup-
tion to the ADSL line can be immediately substituted by the mobile-telephony
line. The LANCOM 1751 UMTS supports all current mobile technologies:
GPRS, EDGE, UMTS and HSxPA.
The various mobile telephony technologies in overview:
GPRS: General Packet Radio Service, technology for packet-orientated data transfer in GSM
networks. Achieves in practice data-transfer speeds of up to 56 kbps.
EDGE: Enhanced Data Rates for GSM Evolution is technology that increases data rates over
GPRS by using an additional method of modulation. EDGE acheives theoretical data rates
of up to 384 kbps downstream and ca. 110 kbps upstream. EDGE is widely available in
many countries and offers an interesting alternative to UMTS.
UMTS: The Universal Mobile Telecommunications System is also known as the third-gene-
ration mobile-telecommunications standard (3G). The first version of UMTS reaches down-
load rates of 384 kbps.
HSxPA: High Speed Downlink Packet Access (HSDPA) and High Speed Uplink Packet Access
(HSUPA) are protocol additions to UMTS. Various versions of HSDPA achieve download rates
of up to 14.6 Mbps, HSUPA reaches upload rates of up to 5.8 Mbps.
Actual available bandwidths depend on the version supported by the network operator and on
the UMTS modem in use.
Advantages of mobile-telephony backup over ISDN/analog:
10
ADSL
UMTS
NETWROK
Faster than ISDN/analog: Data throughput is far higher with UMTS/HSxPA.
INTERNET
VPN GATEWAY
HEADQUARTER
SERVER