Method of controlling a data terminal equipment for equalizing a

Details Method of controlling a data terminal equipment for equalizing a Method of controlling a data terminal equipment for equalizing a

1990-11-16

1992-09-22

Dwyer, James L.

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

379100, 375 13, 358406, 358438, 358447, H04M 1100

Patent

active

051504006

ABSTRACT:
A method for controlling a data terminal equipment coupled to a network via a line and coupled to a center apparatus via the line and the network. A plurality of tone signals sent from the center apparatus and having mutually different frequencies are received. The levels of the tone signals are detected. The characteristic of the line is judged on the basis of the levels of the tone signals. A suitable equalizing characteristic most suitable for the characteristic of the line is selected from among a plurality of predetermined equalizing characteristics compensating for possible characteristics of the line. There is also provided a data terminal equipment using the above-mentioned method.

REFERENCES:
patent: 3742360 (1973-06-01), Ragsdale
patent: 3758881 (1973-09-01), Rummler
patent: 4063183 (1977-12-01), Evans
patent: 4097806 (1978-06-01), Evans
patent: 4245320 (1981-01-01), Desblache
patent: 4477913 (1984-10-01), Koya et al.
patent: 4768204 (1988-08-01), Zeiss

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