ASCII (American Standard Code for Information Interchange)

A standard coding scheme

specifically oriented toward data processing applications, ASCII was developed in 1963 and modified in 1967 by the American National Standards Institute (ANSI). ASCII employs a 7-bit coding scheme, supporting 128 (27) characters, which is quite satisfactory for both upper case and lower case letters of the English alphabet and similarly simple Roman alphabets, Arabic numerals, punctuation marks, a reasonable complement of special characters, and a modest number of control characters. As ASCII was designed for use in asynchronous communications (involving non-IBM computers, in those days), relatively few control characters were required, making a 7-bit scheme acceptable. IBM computers, which were relatively complex mainframes, required the 8-bit EBCDIC coding scheme to accommodate the necessary complement of control characters.Table A-2 shows the ASCII code.

• Class 1
• Class 2
• Class 2
• Class 3
• Class 4
• Class 4/5
• Class 5
• Class A ATM traffic
• Class A cable
• Class A IP address
• Class B ATM traffic
• Class B cable
• Class B IP address
• Class C ATM traffic
• Class C cable
• Class C IP address
• CLASS (Custom Local Access Signaling Services)
• Class D ATM traffic
• Class D ATM traffic
• Class D cable
• Class D IP address
• Class D IP address
• Class E cable
• Class E IP address
• Class F cable