DSL-310 ADSL Modem User’s Guide
Appendix B – Microfilters and Splitters
Most ADSL clients will be required to install a simple device that prevents the ADSL line from interfering
with regular telephone services. These devices are commonly referred to as microfilters or sometimes
called (inaccurately) line splitters. They are easy to install and use standard telephone connectors and
cable.
For some ADSL clients, a telecommunications technician will be sent to the client’s premises to modify
the telephone line, usually at the point where the telephone line enters the building. If a technician has
divided or split your telephone line into two separate lines - one for regular telephone service and the
other for ADSL – then you do not need to use any type of filter device. Follow the instructions given to you
by your ADSL service provider, ISP or telephone company about where and how you should connect the
Modem to the ADSL line.
In-Line Filters
Two common styles of low pass filters are shown in this section, the first is an in-line filter and is
illustrated in Figure 16 below. In-line filters are easy-to-install, in-line devices, which attach to the
telephone cable between the telephone and wall jack.
In-Line Filter Installation
Do not install the microfilter between the Modem and the telephone jack.
Microfilters are only intended for use with regular telephones, Fax machines
and other regular telephone devices.
Note
