(www.digitalengineeringlibrary.com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. Protocols Chapter 2 Figure 2-3 Managing security Madrid Marseilles ASCII codeset is shown in Table 2-1. Mainframes, however, use a different codeset called the Extended Binary Coded Decimal Interchange Code (EBCDIC); the ASCII traffic must be converted to EBCDIC if the mainframe is to understand it, and vice versa, as shown in Figure 2-4. Table 2-1 Character ASCII Value Decimal Value ASCII-Decimal Conversion 0110000 Table 0110001 0110010 0110011 0110100 0110101 0110110 0110111 0111000 0111001 1000001 1000010 1000011 1000100 1000101 1000110 1000111 Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. Protocols Protocols Character ASCII Value Decimal Value 1001000 1001001 1001010 1001011 1001100 1001101 1001110 1001111 1010000 1010001 1010010 1010011 1010100 1010101 1010110 1010111 1011000 1011001 1011010 Binary Arithmetic Review It's probably not a bad idea to review binary arithmetic for just a moment, since it seems to be one of the least understood details of data communications. I promise, this will not be painful; I just want to offer a quick explanation of the numbering scheme and the various codesets that result. Modern computers are often referred to as digital computers because the values they use to perform their function have discrete values Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. Protocols Chapter 2 Figure 2-4 conversion Madrid: Marseilles: 7-bit ASCII 8-bit EBCDIC (remember, the word "digital" means "discrete"). Those values are nomi- nally zero and one: In other words, a value can either be o