Method for indicating a free-line state in a binary data communi

Details Method for indicating a free-line state in a binary data communi Method for indicating a free-line state in a binary data communi

1975-02-27

1976-06-15

Robinson, Thomas A.

Telegraphy

Systems

Line-clearing and circuit maintenance

178 3, H04L 1108

Patent

active

039638677

ABSTRACT:
A method for indicating the free-line state of a subscriber's line connected to a terminal exchange in a binary data communication system comprising generating and transmitting to the exchange a special code word or byte of a plurality of a fixed number of "0" and "1" bits, such as alternate "0" and "1" bits. This special code word is sent after the closing signal at the end of the communication or traffic, which closing signal comprises a byte of only one "1" bit and nine "0" bits, and before the start-again-of-traffic signal, which start signal comprises a byte of only one "0" bit and nine "1" bits. The special free-line state code signal or byte not only indicates the line is free but also can, by the frequency of its alternate bits, indicate to the exchange terminal its modulation rate so that the subscriber can be automatically connected for the next traffic at this rate. Furthermore, by supplying a free-line signal having other than just one "1" bit per byte, a breach in the line is more easily detectable.

REFERENCES:
patent: 2870429 (1959-01-01), Hales
patent: 3453551 (1969-07-01), Haberle
patent: 3731203 (1973-05-01), Lieberman
patent: 3735043 (1973-05-01), Riethmeier et al.

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