GCR(4B - SB) code In this exercise, we will analyze a code called GCR(4B - SB) which has been used for coding data transmitted on a given media as serial4-bit words.

These words are coded with 5-bit codewords as shown in Table 15.3.

The analysis of these codewords reveals that there is no interesting Hamming's distance property. Thus, what was the use ofthis code?

4·bitX 5-bitY 4-bitX 5·bit Y 0000 I 100 I 1000 1 101 0 0001 1 1 0 1 1 1001 01001 0010 10010 1 0 1 0 01010 001 1 100 I I 101 1 o I 0 1 1 0100 1 1 101 1100 1 1 1 1 0 010 1 1 0 1 0 1 1 1 0 10 1 101 0110 10 1 I 0 I 1 1 0 01 I I 0 o 1 1 1 1 0 1 1 1 1 1 1 o1 1 1 1 1