1-2
How do ADSL and ADSL 2+ work?
answering machine, PBX). This is facilitated by splitters which
separate the voice frequencies from the data frequencies.
The Swyx 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 –
P
lain
O
ld
T
elephone
S
ervice). 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 connections. 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. In Germany, for instance, all T-DSL
connections from Deutsche Telekom AG are implemented as ADSL-
over-ISDN connections.
Suffix
Supported telephone sys-
tem
'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
Summary of Contents for SwyxConnect 1722
Page 112: ...I 5 ...