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The ADSL access network provides two types of traffic over a single metallic
twisted-pair:
Data encapsulated in Asynchronous Transfer Mode (ATM) cells.
Voice connections (regular telephone service).
These two traffic types are combined on the single twisted-pair by means of the
Frequency Division Multiplexing (FDM) technique.
To maintain your normal phone service, a remote splitter must be installed first
(see figure 19).
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Existing in-home telephone wiring varies greatly in its installation. For
most Internet service applications, existing in-home wiring provides
adequate performance for the ADSL modem. Improved performance is
obtained from unshielded twisted pair Category 5 cable between the
remote splitter and the ADSL modem.
After installing the remote splitter, connect the modem connector marked LINE to
the phone jack.
Voice and Data
Figure 19. Subscriber Line Interface to Remote Splitter
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The Ethernet port, available on some ADSL models, is a 10BASE-T interface of
type MDI-X.
When the terminal equipment is correctly connected to the ADSL modem, the
visual indicator, marked 10BASE-T, will be solid green. This indicates that the
wiring between the modem and the PC is correct. If not, check the cable layout.
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Data
Remote
Splitter
Voice
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ADSL
Modem
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