Elan C2 Communications Controller, Руководство по установке, Страница: 43 / 73

E L A N H O M E S Y S T E M S
INSTALLATION MANUAL
© ELAN Home Systems 2009 • All rights reserved. Page 41
C2
Digital Subscriber Line (DSL)
Digital Subscriber Line, or DSL, is a batch of technologies that provide a digital connection
(typically an Internet connection) over the copper wires of the local telephone network. DSL
provides high speed Internet access to home consumers in Europe and North America.
Telephone services were initially designed to carry “Plain Old Telephone Service” (POTS) or
Public Switched Telephone Network (PSTN) calls. DSL allows ordinary phone lines to provide
a way to carry data and voice services simultaneously.
DSL Filters
Installers will need to install a passive electronic filter (known variously as a “filter”, “microfilter”
or a “splitter”) up stream of the C2 if using the POTS service on the same line. This
ensures that the DSL modem and the telephone only receive the frequencies they are
designed to handle. The end user will need a splitter. The splitter is first thing connected to an
incoming phone line. Then, one side of the splitter goes to the DSL modem. The other side
goes through the filter to the C2 TELCO input.
OUT
PHONE
LINE 1/2
IN
TELCO
LINE 1/2
LINE
DSL
PHONE
From
Incoming
Phone Service
Demarcation
Point
DSL
MODEM
PC
To
House
Phones
Filter
Figure 3-17: DSL Filters