Freescale Semiconductor TWR-MCF52259-Ethenet - Manual (Page 17)

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Ethernet Router/Gateway
A Router or Gateway is used to translate one protocol to
another .
It is also used when the physical layer changes mediums .
Ethernet to fiber
At one time there was a difference between a router and a
gateway.
The gateway was strictly used as a medium translator (
electrical ) and the router was strictly used as protocol
translator ( software ).
Now routers and gateways are normally combined and
called a routers .
Note: Ethernet to WiFi is a router functionality.