ADEMCO 8132, Установка и настройка

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3-1
S E C T I O N 3
Communications Setup
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In This Section
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General Information
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Network Architecture
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Symphony/Symphony-i Connectivity
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Typical Residential Broadband Network Methods
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Cable Modem Technology Primer
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ADSL (Asynchronous Digital Subscriber Line) Primer
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General Information
This section provides an overview of networking techniques and methods commonly used in
home and commercial Local Area Networks (LANs). While no single method described here
may apply to your specific Symphony/Symphony-i installation, the information should serve
as a framework for increasing your general understanding of data network applications.
Network Architecture
This overview describes several typical LAN configurations:
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Cable Modem (DOCSIS)
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ADSL (Advanced Digital Subscriber Line)
Symphony/Symphony-i Connectivity
The Symphony/Symphony-i family connects to any of these network variants in the same
manner; via an Ethernet cable (10BaseT), terminating in an RJ45 connector. Although
Symphony/Symphony-i provides its own security and does not require a firewall, it is
recommended that in most installations, Symphony/Symphony-i be connected through a
Firewall/Router device, which will enable the device to be connected to the home network
without altering the connections of any other device on the network.
Typical Residential Broadband Network Methods
There are two typical “broadband” (high data rate) networking solutions available to the U.S.
residential market: Cable Modem and ADSL. Currently, Cable Modem technology has the
largest number of residential subscribers, since ADSL has certain range limitations that do
not affect fiber optic/coaxial cable networks. This section provides some background
information on the technologies themselves.
Cable Modem Technology Primer
Cable systems were originally designed to deliver broadcast television signals efficiently to
subscribers' homes. To ensure that consumers could obtain cable service with the same TV
sets they use to receive over-the-air broadcast TV signals, cable operators recreate a portion
of the over-the-air radio frequency (RF) spectrum within a sealed coaxial cable line.
Traditional coaxial cable systems typically operate with 330 MHz or 450 MHz of capacity,
whereas modern hybrid fiber/coax (HFC) systems are expanded to 750 MHz or more.