（单词翻译:单击）
Codec
Codec is a contraction1 of coder and decoder; a device that encodes analog2 signals into digital signals, for transmission through a network in digital format3, and decodes4 received digital signals back into analog signals.
Common Channel Signaling (CCS)
CCS is a signaling system developed for use between stored program control digital switching systems, in which all of the signaling information for one or more trunk groups is transmitted over a dedicated5 signaling channel, usually, but not always completely separate from the user traffic bearing facilities.
Common Management Information Protocol6 (CMIP)
CMIP is the OSI protocol for network management. A structure for formatting7 messages and transmitting information between reporting devices (agents) and data collection programs, developed by the International Standards Organization and designated ISO/IEC 9596.
Communications
Communications is the process of representing, transferring, interpreting or processing information (data) among persons, places, or machines. Communications implies a sender, a receiver, and a transmission medium over which the information travels. The meaning assigned to the data must be recoverable without degradation8.
Conditioning
Conditioning is an adjustment made to the electrical characteristics of a cable pair to improve its performance for a specific use.
Conductor
In electrical circuits, a conductor is any material that readily permits a flow of electrons (electrical current) through itself. Analogously9, optical fibers10 are sometimes said to conduct light waves and are also referred to as conductors.
Corporation for Open Systems (COS)
COS is a nonprofit organization composed of manufacturing, service, and user organizations in the computer communications area. Seeks to facilitate the development of the international, multi-vendor11 marketplace through the development, introduction, and verification of OSI and ISDN standards and by ensuring vendor equipment interoperability.
CO
central office
