14400 (14.4k) value once represented a very popular modem baud rate that was used with dial-up connections
This is further explained below.
Generally, The number of times in one second that as a signal (such the one delivered by a modem, for example) undergoes a change is referred to as its baud rate.
Baud and bits per second are the units of measurement for modem speed.
In conclusion, Instead of using the phrase bits per second (bps), the term baud is often used to refer to the speed of a modem.
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