Data terminal interface circuit to a telephone transmission line

Details Data terminal interface circuit to a telephone transmission line Data terminal interface circuit to a telephone transmission line

1986-08-18

1988-08-16

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 691, 379 93, 379443, 333 24R, 333131, H04B 150

Patent

active

047649224

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.

REFERENCES:
patent: 4443662 (1984-04-01), Nakhla
patent: 4456985 (1984-06-01), Carsten et al.
patent: 4456986 (1984-06-01), Carsten et al.

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