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3. Physical Layer > 3.1 Serial Line
3.1 Serial Line
A PC has connectors for the COM1 and COM2 serial interfaces usually on the back. COM1 is commonly used for a mouse; hence after the serial line has been connected to our PC, only COM2 is left. The serial interface is usually used for connecting the modem.
Serial PC outputs use signals specified by the ITU-T V.24 standard (corresponding to the US standard—RS-232). It is an interface for serial asynchronous arrhythmic data transport. It is usually used for rates up to 64 Kbps although, you are most likely to connect your modem at home using 115,200 bps, and surprisingly, it is going to work well.
