Prestige 623R-T ADSL Dual-link Router
ZyXEL Prestige 623R-T1 Quickstart Guide for IOL Broadband – Page 4
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How to “self-install” ADSL using Microfilters
Introduction
ADSL is an exciting technology that allows electronic data to be transmitted over existing telephone lines at
far higher speeds than can be achieved with a normal modem. The signals that are transmitted between the
ADSL modem at a customer’s premises and the ADSL equipment at their local exchange use a higher
electronic “frequency” than those used by normal telephone equipment (such as telephones, answering
machines, fax machines, cordless telephones, analogue modems, etc). Because of this, you can continue to
use your existing “ordinary” phone equipment to make and receive calls at the same time as you use your
new ADSL equipment – all on the same phone line!
Your existing phone equipment, however, is not designed to be aware of (or to ignore) the high frequency
signals that will be used by your new ADSL modem. Therefore, it is necessary to prevent the ADSL signals
from reaching your existing phone equipment. Otherwise you may get undesired side effects, including
interference with your telephone call quality, an inability to make calls or even damage to your equipment.
Microfilters
The solution is to install a small electronic device called a “microfilter” between any existing telephone
equipment and the phone sockets into which they are plugged. The microfilter allows the “ordinary”
(telephone) signals to reach your equipment, but not the high frequency ADSL signals. Installation of the
microfilters takes just a few moments, after which you can start to use your new ADSL equipment without
having it interfere with your existing phone equipment.
Your ADSL “Self Install” kit includes two types of microfilter (as pictured):
• A “single socket” microfilter for use at any
telephone points where you have a telephone,
answering machine, fax machine, etc.
connected.
• A “double socket” microfilter for use where you
will be installing your ADSL modem. This
microfilter allows you to connect both your
modem and an “ordinary” telephone device at
the same location.
Your ADSL Self-Install Kit includes two single-port
ADSL microfilters and a double-port ADSL microfilter
NOTE: if you have any equipment directly connected to your telephone line, such as an alarm system or a
PABX, it will also require shielding from ADSL signals. Also, if you have more than four telephone devices,
you may require a different type of microfilter. Contact IOLBB support in either of these circumstances.
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