Honeywell HC900 Benutzerhandbuch

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Components and Architecture - Networking Basics Reference 
26 
  HC900 Hybrid Controller Installation and User Guide 
Revision 5 
  
9/03 
Table 4 - Networking Device Types 
Network 
Device 
Description Notes 
Hub 
A Hub is so called because a diagram of its 
connections resembles a hub of a spoked 
wheel.  
Characteristics:  
Echoes a message on any port to all other 
ports; constitutes a collision domain for all 
connected devices.  
Isolates the device(s) on a "bad" port. 
 
Switch 
A Switch is similar in appearance to a Hub, but 
connects only the ports specified as Source and 
Destination devices in each message packet. 
Collision domains are partitioned; that is, they 
are isolated to Source/Destination devices. 
 
Repeater 
Extends the distance over which network 
traffic can be transported; all message packets 
at input port are repeated at the output port (no 
domain partitioning).  Signals are amplified, 
but are not re-shaped or re-timed.    
 
 
Bridge 
An intelligent Repeater that connects input and 
output ports, but only if the message specifies 
the device on the output port as the 
Destination.   
 
 
Router 
An intelligent Bridge that is often used for 
wide area networks (WANs).  Usually includes 
a computer with its own network address, 
memory, and network-based software. It can 
be configured to determine which data packets 
received will be transferred to a LAN node 
based on destination address (such as an 
HC900 controller and/or protocol port 
number). 
 
Gateway 
A PC set up to inter-connect two disparate 
network models at any combination of layers 
of the OSI Model.