Chapter 1 Connecting the Device
8
User’s Guide
The ADSL line is your primary connection to an outside network. For a backup data link
to an outside network, you can either connect an Ethernet cable from the Untrusted port
on the NetScreen-5GT Wireless ADSL device to an external router, DSL modem, or cable
modem, or connect a serial cable from the Modem port on the device to an external
modem.
Connecting Splitters and Microfilters
A signal splitter divides the telephone signal into low-frequency voice signals for voice
calls and high-frequency data signals for data traffic. Your service provider usually
installs the splitter as part of the equipment that connects your site’s telephone lines to
the provider’s network.
There are also splitters that you may be able to install yourself, depending upon your
service provider equipment. If you are installing such a splitter yourself, then connect the
ADSL cable from the NetScreen device and the telephone line to the appropriate
connectors (for example, “data” or “voice”) on the splitter. You connect the other end of the
splitter to the telephone outlet.
You may need to install a microfilter on each telephone, fax machine, answering machine,
or analog modem that connects to the ADSL line. The microfilter filters out high-
frequency noise on the telephone line. You install the microfilter on the telephone line
between the telephone, fax machine, answering machine, or analog modem and the voice
connector on the splitter.
The following shows an example of a microfilter and a splitter that you install on your
site. (You must obtain the appropriate microfilters or splitters from your service provider.)
Warning:
You cannot connect both the Untrusted port and the Modem port on the device
to an outside network at the same time.
Telephone Outlet
Splitter
Microfilter
ADSL Cable
