H - Electricity – 04 – B
Patent
H - Electricity
04
B
340/72
H04B 3/23 (2006.01) H04B 1/52 (2006.01) H04L 1/24 (2006.01)
Patent
CA 1322237
PHE87.005 27.11.1987 ABSTRACT Transceiver arrangement for full-duplex data transmission comprising an echo canceller and provisions for testing the arrangement. 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 (S1) enabled in a test mode for disconnecting the receiver part (7, B, 11 - 1 5 ) 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 (S2) 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, (Fig. 1)
572660
Tol Simon Johannes Maria
Wouda Kornelis Jan
At&t Network Systems International B.v.
Fetherstonhaugh & Co.
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