Multiplex communications – Wide area network – Packet switching
Patent
1988-07-15
1990-04-17
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 13, H04B 158
Patent
active
049186850
ABSTRACT:
A transceiver arrangement for full-duplex data transmission over a two-wire circuit (6) comprises a transmitter part (1-4), a receiver part (7, 8, 11-15), a hybrid junction (5) to interconnect the transmitter and receiver parts and the two-wire circuit (6), and an echo canceller 9 whose input is connected to the transmitter part and whose output is connected to the receiver part, the arrangement further comprising switching means (S.sub.1) enabled in a test mode for disconnecting the receiver part (7, 8, 11-15) from the two-wire circuit (6). With a single test the proper functioning of the transmitter and receiver parts of the arrangement as well as that of the echo canceller (9) can be checked, because the arrangement also comprises switching means (S.sub.2) enabled in a test mode for disconnecting the input of the echo canceller (9) from the transmitter part (1-4) and for connecting it to a data signal source (16) arranged for generating a data signal that is substantially uncorrelated with the transmitter signal.
REFERENCES:
patent: 4352962 (1982-10-01), LaMothe
patent: 4615025 (1986-09-01), Vry
patent: 4769808 (1988-09-01), Kanemasa et al.
patent: 4825459 (1989-04-01), Farrow et al.
Tol Simon J. M.
Wouda Kornelis J.
AT&T Bell Laboratories
Olms Douglas W.
Visserman Peter
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