A data source produces 8-bit ACSII characters. Derive anexpression for the maxim

Question

A data source produces 8-bit ACSII characters. Derive anexpression for the maximum data rate (rate of ASCII characters per second) over a B bps linefor the following: 1. Asynchronous transmission with 1.5 unit stop bit 2. Synchronous transmission, with a frame consisting of 48control bits and 128 information bits. The information field contains 8-bit ASCIIcharacters. A data source produces 8-bit ACSII characters. Derive anexpression for the maximum data rate (rate of ASCII characters per second) over a B bps linefor the following: 1. Asynchronous transmission with 1.5 unit stop bit 2. Synchronous transmission, with a frame consisting of 48control bits and 128 information bits. The information field contains 8-bit ASCIIcharacters.

Explanation / Answer

   Here, g = data bits

            B= data rate on line

Now for each case, compute the fraction ‘g’ oftransmitted bits that are data bits.

1)Given, there are 8 data bits, 1 start bit and 1.5 stop bits.Then

2) Each frame contains 48 control bits + 128 information bits,so each frame will have a total of:

                                    48 + 128 = 176 bits.

The number of characters = 128/8 = 16, then

The number of data bits will be:

                                            16 * 8 = 128 then

                                                    g = 128/176

                                                       = 0.73

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