Crestron e-Control, Справочное руководство

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Software Crestron e-Control
®
Ethernet Networking
NOTE: This section reviews basic Ethernet and IP networking principles that form
the foundation for e-Control. Even if you are familiar with these terms or have prior
networking experience, the material contained here will help you better understand
how Crestron implements e-Control. You can also refer to “Appendix A: Glossary”
on page 46 for a list of networking terms and acronyms used throughout this guide.
A network is any collection of independent computers, printers, and peripheral
devices that are connected by cables. A network incorporating e-Control will also
typically include connected Crestron control systems, network control modules, and
touchpanels that control AV, lighting, and other equipment. Information travels over
the cables, allowing users on the network to communicate, exchange data, and
control equipment. Each device that is connected to the network is called a
node .
Networks can have tens, thousands, or even millions of nodes.
L ocal A rea N etworks ( LAN s) are usually confined to a geographic area, such as a
single building or a college campus. LANs can be small, linking as few as two or
three computers, but often can link hundreds of computers used by thousands of
people.
W ide A rea N etworks
( WAN s) such as the Internet
combine multiple LANs that are
geographically separate.
Switch or Hub
Network Cable
The development of standard
networking protocols and media
has resulted in worldwide
proliferation of LANs
throughout business and
educational organizations. The
most popular LAN technology
in use today, and the standard
that is the basis for e-Control, is
Ethernet , which consists of
computers and devices cabled
together according to specific
rules defined by the Institute for
Electrical and Electronic
Engineers (IEEE).
Ethernet networks are categorized by how fast they can transfer data. Speed is
expressed in
m ega b its p er s econd ( Mbps ) and even g iga b its p er s econd ( Gbps ). One
"bit" is equal to 1/8th of a character, letter, or number. Standard Ethernet operates
at 10Mbps, which is fast enough for most networking tasks. Crestron’s X-Series
control systems and CEN devices operate at 10Mbps.
Fast Ethernet , by contrast,
operates 10 times faster at 100Mbps, making it ideal for video, multimedia, and other
speed-intensive applications. Crestron’s 2-Series control systems and TPS Ethernet-
enabled touchpanels can operate at 10Mbps or 100Mbps. Fast Ethernet and Standard
Ethernet are not readily compatible; making the two speeds communicate on the
same network requires special equipment such as a switch.
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Crestron e-Control® Reference Guide – DOC. 6052