Modem diagnostic loop

Details Modem diagnostic loop Modem diagnostic loop

1988-10-31

1991-02-12

Olms, Douglas W.

Pulse or digital communications

Repeaters

Testing

375 10, 370 15, H04B 138

Patent

active

049930451

ABSTRACT:
A modem side diagnostic loopback apparatus for a two wire communication circuit includes a transformer having a mechanism for connecting to a two wire transmission line on a transmission line side and for coupling to a modem on a modem side. A modem transmitter generates modem transmitter signals and a modem receiver receives signals from the transmission line. A subtracting circuit subtracts the modem transmitter signal from a signal containing both the modem transmitter signal and the received signals. The subtracting circuit may be selectively unbalanced so that the transmitter signals are supplied to the modem receiver and the received signals are inhibited from being received by the modem receiver to effect a loopback.

REFERENCES:
patent: 3937882 (1976-02-01), Bingham
patent: 4039751 (1977-08-01), Couturier et al.
patent: 4127816 (1978-11-01), Grosso et al.
patent: 4656643 (1987-04-01), Geneste et al.
patent: 4686668 (1987-08-01), Koseki et al.
CCITT Recommendation V.54, pp. 281-297, 1984.
The Dow Jones-Irwin Handbook of Telecommunications, by Greene, pp. 617-619, 1986.
Data Transmission Analysis Design Application by Tugal et al, pp. 266-271, 1982.

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