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An asynchronous serial communication controller that uses a start-stop scheme for controlling the serial I/O of a system is programmed for a string of length seven bits, one parity bit (odd parity) and one stop bit. The transmission rate is $1200$ bits/second.

  1. What is the complete bit stream that is transmitted for the string $‘0110101’?$

  2. How many such string can be transmitted per second?

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  1. The complete bit stream will be $1011010111$ [First bit is Start bit; Last bit is Stop bit preceded by Parity bit which is $1$ as odd parity is used and data is of $7$ bits]
  2. Bandwidth is given as $1200$ bits/sec
    One complete bit stream is of length $10$ bits $(1$ Start bit, $7$ bit String, $1$ Parity bit, $1$ Stop bit)
    So, in $1$ second we can send $\frac{1200}{10}=120$ Strings.
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