Crestron e-Control, Справочное руководство

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Software Crestron e-Control
®
Layer 3: Transport - Corresponding to the OSI Transport layer, this is the part of the
protocol stack where the Transport Control Protocol (TCP) and User Datagram
Protocol (UDP) implemented by e-Control can be found. TCP works by asking another
device on the network if it is willing to accept information from the local device.
Layer 4: Application - Layer 4 combines the Session, Presentation and Application
layers of the OSI model. Protocols for specific functions such as email ( Simple Mail
Transfer Protocol , SMTP ) and file transfer ( File Transfer Protocol , FTP ) reside at
this level.
OSI illustration copyrighted by and reused with permission of whatis.com
(
http://www.whatis.com ) and TechTarget, Inc.
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Crestron e-Control® Reference Guide – DOC. 6052