Process for signaling an interruption in the state of readiness

Details Process for signaling an interruption in the state of readiness Process for signaling an interruption in the state of readiness

1977-07-18

1979-07-10

Robinson, Thomas A.

Telegraphy

Systems

Line-clearing and circuit maintenance

178 2R, 178 41R, H04N 132, H04L 2502

Patent

active

041608747

ABSTRACT:
In a process for signaling an interruption in the state of readiness of a data terminal device in a called station, the data being transmitted over a data selector network, and in particular for teleprinters, following the establishment of a connection, the calling station requests the called station to transmit identification by way of the data selector network. Following reception of the identification assigned to the called station, the data transmission begins and upon the occurrence of disturbances which interrupt the state of readiness for reception in the called station, a monitoring circuit responds. For the duration of the interruption of the state of readiness the monitoring circuit blocks the identification keyer in the called station from transmitting the identification assigned to the called station and the monitoring circuit automatically clears the connection. The monitoring circuit causes the identification keyer to transmit a specific code character to the calling station, the stipulated code character indicating the disturbance in the state of readiness and possibly the nature of the disturbance, and the monitoring circuit subsequently automatically clears the connection.

REFERENCES:
patent: 2669602 (1954-02-01), Salmon et al.
patent: 2921116 (1960-01-01), Makary
patent: 3310627 (1967-03-01), Da Silva
patent: 3444315 (1969-05-01), Shimabukuro et al.
patent: 3830962 (1974-08-01), Mailloux

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