bandwidth is 19.2Kbps
I think
19.2*10^3 bits -is transfer per second
19200 bit is transfer per second
Now they say 1 character is made 7 bits + 1 parity = 8 bits
Since it is asynchronous whenver you are sending it would require 1 start and stop bit
So 10 bit now is required to send 1 character
Number of character that can be send is 19200/10 = 1920 character