Gateway

In telecommunications the gateway is:

An equipment of a network node making the connection with another network using different protocols.
A gateway may include devices like protocol translators, devices to adjust the impedance, rate converter, error isolators or signal transmitter required for systems' interoperability.
A protocol mapping gateway interconnects technological networks with different protocols using protocol conversions.
A computer configured to realize a gateway's tasks.

Routers are a special case of gateway.

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