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Module 1: Physical Layer & Data Communication

20162m

How many bytes of data can be sent in 15 seconds over a serial link with baud rate of 9600 in asynchronous mode with odd parity and two stop bits in the frame?
(i) 10,000 bytes
(ii) 12,000 bytes
(iii) 15,000 bytes
(iv) 27,000 bytes

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(ii) 12,000 bytes

In asynchronous mode, each character frame = 1 start bit + 8 data bits + 1 parity bit + 2 stop bits = 12 bits per byte.

Baud rate        = 9600 bits/sec
Bits per byte     = 1 (start) + 8 (data) + 1 (parity) + 2 (stop) = 12

Bytes/sec  = 9600 / 12 = 800 bytes/sec
In 15 sec  = 800 × 15 = 12,000 bytes

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