Appendix1. Ethernet Control LAN Network Construction Guide
37
Switching Hubs and Hubs (Shared Hubs)
There are two types of hubs: switching hubs (also called simply "switches") and shared hubs (also called
simply "hubs").
Switching Hub
It is called a Multiport Bridge in IEEE802.3u. It has a MAC address table for stations connected between
ports. The destination address of a frame is used to switch between ports for output (switching).
The following figure illustrates the data flow when data is sent from Station A to Station B if a switching hub
is used.
Data is sent from Station A to Switching Hub First Port.
In the Switching Hub, data received from the first port is temporarily stored in the buffer memory.
According to the destination address of the frame, the port for output is determined, and data is passed to
the 4th port.
Data is sent from the Switching Hub 4th Port to Station B.
1 2 3 4 5 6 7 8
E E EE E EE E
Buffer
Memory
LAN Control LSI
RJ-45Connector
Station A Station B
Switching Hub
High-speed
Internal Bus
Station C Station D
Figure A1.18 Operations of a Switching Hub
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