Overhead information
Encyclopedia
Overhead information is digital
information
transferred across the functional interface
between a user
and a telecommunications system
, or between functional units within a telecommunications system, for the purpose of directing or controlling the transfer of user information
or the detection and correction of errors.
Overhead information originated by the user is not considered to be system overhead information. Overhead information generated within the communications system
and not delivered to the user is system overhead information. Thus, the user throughput
is reduced by both overheads while system throughput is reduced only by system overhead.
Digital
A digital system is a data technology that uses discrete values. By contrast, non-digital systems use a continuous range of values to represent information...
information
Information
Information in its most restricted technical sense is a message or collection of messages that consists of an ordered sequence of symbols, or it is the meaning that can be interpreted from such a message or collection of messages. Information can be recorded or transmitted. It can be recorded as...
transferred across the functional interface
User interface
The user interface, in the industrial design field of human–machine interaction, is the space where interaction between humans and machines occurs. The goal of interaction between a human and a machine at the user interface is effective operation and control of the machine, and feedback from the...
between a user
User (telecommunications)
In telecommunications, a user is a person, organization, or other entity that employs the services provided by a telecommunication system, or by an information processing system, for transfer of information....
and a telecommunications system
System
System is a set of interacting or interdependent components forming an integrated whole....
, or between functional units within a telecommunications system, for the purpose of directing or controlling the transfer of user information
User information
User information is information transferred across the functional interface between a source user and a telecommunications system for delivery to a destination user.In telecommunications systems, user information includes user overhead information....
or the detection and correction of errors.
Overhead information originated by the user is not considered to be system overhead information. Overhead information generated within the communications system
Communications system
In telecommunication, a communications system is a collection of individual communications networks, transmission systems, relay stations, tributary stations, and data terminal equipment usually capable of interconnection and interoperation to form an integrated whole...
and not delivered to the user is system overhead information. Thus, the user throughput
Throughput
In communication networks, such as Ethernet or packet radio, throughput or network throughput is the average rate of successful message delivery over a communication channel. This data may be delivered over a physical or logical link, or pass through a certain network node...
is reduced by both overheads while system throughput is reduced only by system overhead.