Non-invasive link monitor

Details Non-invasive link monitor Non-invasive link monitor

1992-09-15

1996-04-02

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 24, 375213, 375257, 34082506, 324322, H04J 116

Patent

active

055047360

ABSTRACT:
A non-invasive directional coupler (51) comprising a voltage probe (300) and a current probe (301) is used to detect and separate from each other digital pulses (quats) being transmitted in opposite directions on a digital ISDN subscriber loop 200 (U-interface 15). The voltage probe measures the sum of digital pulse voltage of the conductors (201, 202) of the loop while the current probe measures the difference of digital pulse currents of in the conductors. An equalizer (304) converts the difference of the currents into the difference of the corresponding voltages. The sum and difference voltage measurements are then added (305) and subtracted (306) respectively to obtain voltages for digital pulses propagating in each direction. The voltages are provided to a decoder (52) such as a protocol analyzer for processing to interpret the traffic being sent in each direction on the loop.

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