Serial Interface

Recently i came acrross with the phrase"router serial interface". What is that? Are we talking about the ethernet interface with other words.? Please explain. Thank you.

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No, a serial interface would be for T1 lines, xDSL, SNA, X.21, and similar transmission methods. However, there may be a serial interface on a router to allow someone with an RS232 connection and a data terminal (or terminal emulator) to reach the command line of the router. Also, there may be a serial interface on a router (usually labeled as an "aux" interface) to allow the router to communicate via dial-up modem with a remote device.

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