INSTALLATION
Page 34
DOC_DEV_IPL_User guide_D
12
Connecting to the ADSL line
Line length / signal level :
The IPL-A can be connected to an analogue line telephone line or an unbundled loop when the attenuation of
the reception signal is better than 63 dB
When the reception level is close to the limit, disconnections may occur.
In that situation, we recommend to ask to the ISP to setup the line with the RE-ADSL modulation which is suited
for long line and weak signal.
ADSL filter :
If the line must be used for analogue voice transmission simultaneously with ADSL transmission, it is
necessary to connect an ADSL filter.
Surge arrester :
The ADSL board of the IPL-A is protected very carefully against over voltage coming from the line.
However, when the line is exposed to lightning, we recommend to connect a surge arrester between the line
and the IPL.
IP address :
The IP address assigned by the ISP to the ADSL interface of the IPL can be a fixed or a dynamic public IP
address.
If it is dynamic, it changes frequently; for instance at each ADSL connection.
It is why, the router which owns a dynamic IP address can only initiate the communication (initiate a VPN for
instance) towards a router owning a fixed IP address.
Reciprocally, a router owning a dynamic IP address cannot easily receive a connection except a Dynamic DNS
service is used.
Filter
Surge arrester
PSTN
Router