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LANCOM 1722 VoIP – LANCOM 1723 VoIP – LANCOM 1724 VoIP – LANCOM 1823 VoIP
Chapter 1: Introduction
12
EN
shake routines during connection establishment ensure that the standards
ADSL, ADSL 2 and ADSL 2+ are intercompatible.
Parallel to data transfer, ADSL also provides full and unlimited support for the
classic applications in telephony (telephone, fax, answering machine, PBX).
This is facilitated by splitters which separate the voice frequencies from the
data frequencies.
The LANCOM VoIP Router features an integrated modem for ADSL/ADSL 2+.
It can be directly connected to the splitter with the supplied cable.
ADSL can operate over both ISDN- and analog telephone lines (POTS – Plain
Old Telephone Service). Devices with an integrated modem are supplied in
two versions. Information about the supported telephone system is to be
found on the type designation on the underside of the device. The device
name is marked on the label along with a suffix which indicates the supported
telephone system:
Annex A-type devices are exclusively to be operated at ADSL-over-POTS con-
nections. Annex B-type devices are exclusively to be operated at
ADSL-over-ISDN connections. Your network operator will be able to inform
you of the version you need. These devices cannot be altered or upgraded to
a system other than that for which it is equipped.
There are even ADSL-over-ISDN connections which are not combined with an
ISDN connection, but with a standard analog telephone connection instead.
Suffix Supported telephone system
'Annex A' ADSL-over-POTS
'Annex A' ADSL-over-ISDN
Internet
Splitter
Router with integrated
ADSL modem
Telephone
PSTN
Splitter
ADSL prover
Switching
nodes
DSLAM
Subscribers
12


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