Manual Lancom 1722 VoIP (page 11 of 122) (English)

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LANCOM 1722 VoIP – LANCOM 1723 VoIP – LANCOM 1724 VoIP – LANCOM 1823 VoIP

 Chapter 1: Introduction

1Introduction

LANCOM VoIP Routers are fully functional routers with an integrated firewall

to provide local networks with secure access to the Internet.

With the VPN option included, these devices work as powerful Dynamic VPN

gateways for external locations or mobile users.

Along with the ADSL connection, these devices also feature ISDN connections,

and some feature analog telephone connections. An ISDN line can be used to

backup the WAN connection, for remote management of the router, as a basis

for office communications via LANCAPI, and for establishing Dynamic VPN

connections to external locations that use dynamic IP addresses.

By using the Voice over IP function, these devices can transfer voice data over

broadband Internet as well as over ISDN and analog telephone connections.

Nur LANCOM 1823

VoIP



LANCOM Wireless Routers and LANCOM Access Points can be oper-

ated either as self-sufficient access points with their own configura-

tion (WLAN modules in "Access Point mode") or as components in a

WLAN infrastructure, which is controlled from a central WLAN Con-

troller ("managed mode"). Please observe the corresponding notices

in this documentation.

1.1 How do ADSL and ADSL 2+ work?

ADSL (Asymmetric Digital Subscriber Line) is currently the most common tech-

nology for broadband Internet connections. Standard and almost ubiquitous

telephone lines (analog or DSL) are the basis for DSL data transfer to the near-

est telephone exchange. From here, the data is passed directly on to the Inter-

net over high-speed connections.

The asymmetric DSL variant ADSL was developed for applications where users

receive large amounts of data but transmit only small amounts, such as when

surfing in the WWW. ADSL subscribers can receive data at up to 8 Mbps

("downstream") and transmit at up to 800 kbps ("upstream"). ADSL providers

are able to reduce these maximum rates as they please.

To satisfy the strongly increasing demand for higher bandwidths, the stand-

ards ADSL 2 and ADSL 2+ provider higher data rates as a basis for applica-

tions such as video streaming or high-definition TV (HDTV) over the Internet.

Depending on the Internet provider, ADSL 2 devices support downstream data

rates of up to 12 Mbps, and ADSL 2+ devices support up to 24 Mbps. Hand-

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Lancom 1722 VoIP Manual

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