Data terminal interface circuit to a telephone transmission line
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United States of America Patent
Stats
-
Aug 16, 1988
Grant Date -
N/A
app pub date -
Aug 18, 1986
filing date -
Aug 21, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
At a transmission line (La', Lb') connected with telephone station equipment (Tel) via a lowpass filter (TP), via which telephone station signals are transmitted in a first frequency range, there is connected via a line transformer (U3) a data terminal (DG) which is able to receive and to send data signals in a second frequency range above the first frequency range. On its side toward the transmission line (La', Lb'), the lowpass filter (TP) has a capacitive termination (C7) which is rated so that its a-c resistance is in the order of magnitude of or preferably less than the characteristic impedance of the data transmission line in the second frequency range.
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