What are the differences between the E1 interface and the serial interface of an AR router

The differences and relationship between the E1 interface and the serial interface of an AR router are described as follows:

The serial interface of an AR router uses the DB9 female connector. It is the physical implementation of the E1 interface and is used transmit data in lines with 2 Mbit/s and lower bandwidth.

DB9 male connectors used on PCs are also called serial interfaces in some scenarios. However, these interfaces are used only to connect to the console interface of routers for device debugging.

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