Line control of switched network data sets

Details Line control of switched network data sets Line control of switched network data sets

1981-12-21

1984-12-11

George, Keith E.

H04M 1100

Patent

active

044880022

ABSTRACT:
Each station of a switched telephone network voiceband data communication system includes a data set and a telephone set. The data set includes primary signal processing circuitry which performs the real-time signal processing of the data set under the control of a microprocessor-based primary controller. The latter also controls connection of the data set and telephone set to, and disconnection of same from, the telephone line. A portion of the frequency spectrum of the telephone line is allocated to a secondary channel over which a secondary controller within each data set communicates test, health and other information to a counterpart within the other data set. Line functions, such as the switching of a station into and out of the data state, talk state and disconnect state, are not executed at least until a line control message indicative of the line function in question has been communicated to the data set within the other station via the secondary channel. This allows appropriate steps to be taken at one or both stations to avoid such potential problems as the non-disconnection of unattended telephones and the premature re-enabling of disabled echo suppressors.

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Bell System Data Communications Technical Reference, "Data Set 202E Series", American Telephone and Telegraph Company, New York, Mar. 1968.

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