LANCOM 1722 VoIP – LANCOM 1724 VoIP
Chapter 1: Introduction
11
EN
frequencies” from the “data frequencies” and ensure that the signals are for-
warded to the appropriate networks.
A splitter is also used at the subscriber end to permit ADSL modems/routers
and conventional telephone equipment to be used at the same time. The
router is connected to a seperate ADSL modem, the ADSL modem is connected
to the splitter.
In the LANCOM 1722 VoIP the ADSL/ADSL 2+ modem is integrated directly in
the device. It can be directly connected to the splitter with the supplied cable.
ADSL can operate over modern ISDN telephone service as well as conven-
tional analog service (POTS –
P
lain
O
ld
T
elephone
S
ervice). Devices with inte-
grated ADSL modem are offered in two different versions. You can determine
which telephone system a device supports by looking at the model description
on the bottom of the device. The label containing the device name also con-
Power LAN WLAN
-1
WLAN
-2
WAN Message
Internet
Splitter
LANCOM VoIP Router
Telephone
Telephone
network
Splitter
ADSL provider
Switching node
DSLAM
Subscriber
ADSL
modem
Router with integrated
ADSL modem
Internet
Splitter
Telephone
Telephone
network
Splitter
ADSL provider
Switching node
DSL access
multiplexer
Subscriber
