Standards and Protocols
Today, there are a number of industry standards that allow equipment from one manufacturer to communicate with equipment from another manufacturer. Telecommunications standards include Bell and ITU-T. The Bell standards (for example, Bell 103 and Bell 212A) have been followed primarily in the United States and are, relatively speaking, obsolete. The ITU-T (International Telecommunications Union Telecommunication Standardization Sector), formerly known as CCITT, covers international standards followed worldwide. All the standards prefixed with “V” are ITU-T standards. For example, the latest modulation scheme is V.92.