D-Link DSL-200 User Manual - Microfilters And Splitters
5
The drivers are fundamentally different in the way they function with the PC. The
PC/Modem relationship can be summarized as follows:
WAN driver – The WAN driver will cause the Modem to appear to the PC as an
ordinary dial-up modem. The Modem employs the Dial-Up Networking software used by
conventional analog modems even though there is no actual dialing or any activity in
the voice band frequencies on the telephone line. This driver supports RFC 2364 PPP
over ATM with PVC connections.
LAN driver - The LAN driver will cause the modem to appear to the PC as a LAN or
Ethernet device. Connection is automatic, similar to a connection to an Ethernet device.
This driver supports RFC 1483 “Bridged Ethernet” with PVC connections. PPP over
Ethernet (RFC 2516) connections are possible with installation of additional client
software.
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 (microfilter) line splitters. They are easy
to install and use standard telephone connectors and cable.
Some DSL service providers will send a telecommunications technician to modify the
telephone line, usually at the point where the phone 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
about where and how you should connect the Modem to the ADSL line.
Microfilters
Unless you are instructed to use a “line splitter” (see below), it will be necessary to
install a microfilter (low pass filter) device for each telephone or telephone device
(answering machines, Faxes etc.) that share the line with the ADSL service.
Microfilters are easy-to-install, in-line devices, which attach to the telephone cable
between the telephone and wall jack. Microfilters that install behind the wall plate are
also available. A typical in-line microfilter installation is shown in the diagram on the
next page.