英语翻译

英语翻译
DATA TRANSMISSION
To achieve industrial acceptance of the c-i-s supply concept as wide as possible,not only energy
transmission but also data transmission shall be possible by only one two-wire supply line.
Preliminary investigations of PTB showed that this is also possible with the c-i-s concept
(“Powerline Communication“).
As is generally known,each periodical interruption of a direct voltage effects - for systeminherent
reasons - the emission of higher-frequency interference levels.To make this simple and
uncomplicated,the data rate,however,shall be chosen in such a way that the highest frequency
required for data transmission is much lower than the repetition frequency of the c-i-s switching
mode.The basic oscillation and its harmonics of the c-i-s switching mode could be filtered out
by means of a simple low-pass filter.The passband of this filter should only comprise the
frequency ranges required for data transmission.Data transmission rates up to 50 kbit/s are
considered to be realistic.
Due to the spectral distribution of the interference power caused by the c-i-s switching mode
faster data transmissions requiring an increased bandwidth above the repetition frequency of the
c-i-s switching mode can probably only be realized with considerable circuitry effort.
In any case,however,it is possible to realize a data rate of an order of magnitude as usual in
currently existing process control systems on the basis of the FISCO Model according to IEC
60079-27 with the “simple” method of first-order low-pass filtering as described above.