ISDN Protocol Administrator's and Developer's Guide ... - Intervoice

American National Standards Institute (ANSI)A nongovernment organization that works with CCITT and ISO todefine and publish international standards for telecommunications.The three organizations recommend the standards, and ANSIfocuses on applying the standards in North America.ASCII (American Standard Code for Information Interchange)The American-designed standard for the English character sets andcode numbers used in almost all present-day computers. US-ASCIIrepresents all the unaccented uppercase and lowercase letters,numbers, most basic punctuation, some control codes, and spaces.There are 128 standard US-ASCII codes (0-127), each of which canbe represented by a 7-digit binary number: 0000000 through1111111. For example, 0000101 (byte value 65) = A, and 0000141(byte value 97) = a. US-ASCII is used to describe files that arestored in clear text format.Async pageAn InVision page view that contains icons representing call flowsfor two asynchronous events: hangups and session timeouts.B (Bearer) ChannelA basic component of ISDN interfaces. It carries 64,000 bits persecond in both directions. It can carry either data or voice,depending on local telephone service, and is circuit switched.Basic Rate Interface (BRI)An ISDN channel that consists of two B channels and one Dchannel. The total data capacity rate is 144 kbps. Voice and user dataare sent over the B channels, while the D channel is used for controland signalling or X.25 packet networking. BRI is called ISDN 2 inGreat Britain.BRISee Basic Rate Interface.CCITTConsultative Committee on International Telegraphy andTelephony. CCITT is one of the four permanent parts of theInternational Telecommunications Union (ITU), a United Nationsagency based in Geneva, Switzerland. One of its functions is to setup standards, or recommendations, for telecommunicationsequipment, systems, networks, and services.Glossary-2 ISDN Protocol Administrator’s and Developer’s Guide 60001262, First Edition