Tiernan TDR7, Руководство пользователя

Страница: 178 / 226

166
Glossary
Buffer
In data transmission, a buffer is a temporary storage location
for information being sent or received. A buffer is usually located
between two different devices that have different abilities or speeds
for handling the data.
Buffer overflow
Within a data buffering system, the condition
occurring whenever the number of data bits entering the buffer
exceeds the data capacity of the buffer.
Buffer underflow
Within a data buffering system, the condition
occurring whenever the number of data bits entering the buffer is not
sufficient to maintain the buffer minimum output rate.
Built–in –self– test
Evaluative procedures residing in the TDR7
micro–controller which are used to provide diagnostic information
regarding its operational state.
C
C–band
A portion of the electromagnetic spectrum used heavily for
satellite transmissions. The uplink frequency is at 6GHz, and the
downlink is at 4GHz. Traditional applications include voice
communications, video conferencing, and broadcast TV and radio.
Cable Loss
Loss of signal quality within cable, typically due to
impedance as a result of excessive cable length or material
construction.
Carrier Offset
The frequency difference in Hertz measured between
the programmed receive frequency and the actual frequency received.
Channel
A single path for transmitting electric or electromagnetic
signals.
CSA
Canadian Standards Association—The Canadian counterpart
of the U.S. Underwriters Laboratories.
D
Data
Typically refers to the information content of a signal including
video, audio, graphic, or character–based information.
Data Bits
Within a data packet, the bits which represent the
information content of a packet. See also Data.