- 産業: Telecommunications
- Number of terms: 29235
- Number of blossaries: 0
- Company Profile:
ATIS is the leading technical planning and standards development organization committed to the rapid development of global, market-driven standards for the information, entertainment and communications industry.
An opening in the jacket of a diskette to allow access to the read/write heads. Synonym read/write opening.
Industry:Telecommunications
An Operating Company Number (OCN) is a four place alphanumeric code that uniquely identifies providers of local telecommunications service. OCN assignments are required of all SPs in their submission of utilization and forecast data (FCC 00-104, ¶ 41 and Public Notice DA 00-1549. ) Relative to CO Code assignments, NECA assigned Company Codes may be used as OCNs.
Industry:Telecommunications
An operating condition of a clock in which it is locked to an external reference and is using time constants that are altered to quickly bring the local oscillator's frequency into approximate agreement with the synchronization reference frequency.
Industry:Telecommunications
An operating condition of a clock in which its local oscillator is not locked to an external synchronization reference, and is using no storage techniques to sustain its accuracy.
Industry:Telecommunications
An operating condition of a clock in which the output signals are controlled by an external input reference. It is the expected mode. In normal mode, each clock in a chain has the same long-term average frequency, and the time error between the input and output of each clock is bounded. Only stratum 1 sources of timing require no input and therefore have a unique status of "normal" operation being equivalent to "freerun". Synonym locked mode.
Industry:Telecommunications
An operating condition of a clock in which the output signals are controlled by an external input reference. It is the expected mode. In normal mode, each clock in a chain has the same long-term average frequency, and the time error between the input and output of each clock is bounded. Only stratum 1 sources of timing require no input and therefore have a unique status of "normal" operation being equivalent to "freerun". Synonym locked mode.
Industry:Telecommunications
An operating condition of a clock that has lost its controlling input and is using stored data, acquired while in normal operation, to control its output. The stored data is averaged to minimize the effects of short-term variations, allowing the normal conditions to be simulated within specifications. Holdover terminates when the output of the clock is no longer controlled by the data stored from a previously connected reference.
Industry:Telecommunications
An operating configuration in which a circuit is established between two stations via an intermediate relay station. Two links are used simultaneously and the channel connections at the relay station are accomplished completely within the station.
Industry:Telecommunications
An operation in which several users share access to a communications channel on a real-time basis, i.e., a user needing to communicate with another user on the same network requests the required circuit, uses it, and when the call is finished, the circuit is released, making the circuit available to other users. Note: Demand assignment is similar to conventional telephone switching, in which common trunks are provided for many users, on a demand basis, through a limited-size trunk group.
Industry:Telecommunications
An operation in which the dynamic range of signals is compressed before transmission and is expanded to the original value at the receiver. Note: The use of companding allows signals with a large dynamic range to be transmitted over facilities that have a smaller dynamic range capability. Companding reduces the noise and crosstalk levels at the receiver.
Industry:Telecommunications
