When I configure a serial interface to use async, the corrosponding tty line configuration option becomes available under line configuration mode. I am not clear as to why there are two options for configuring the same line/interface. Except that maybe the available options under each line/interface are some how associated with different aspects of the line/interface function.
Also, is this unique to serial interfaces in async mode or do all async lines/interfaces (for example, on a true access control server) have the option to configure them via line or interface mode?
If tty is defined as character mode (line mode), how can it also be defined as async packet mode?