Transit exchange for time division multiplex asynchronous data

Details Transit exchange for time division multiplex asynchronous data Transit exchange for time division multiplex asynchronous data

1974-07-24

1976-02-24

Cooper, William C.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

3401725, H04J 300

Patent

active

039405621

ABSTRACT:
The present invention relates to a transit exchange for the transmission of asynchronous data signals having a given character structure and data rate, with the aid of a control equipment, including a computer and a sampling device, which is common to a number of sending terminal equipments and works on the time division multiplex principle. The instantaneous values of the data signals received over each of a number of incoming lines are sampled at a frequency so selected in relation to the asynchronous data rate that at least one sampling pulse falls within a distortionless region of the respective character element. The transit exchange includes a detector working synchronously with the sampling device to establish, by means of the successive processing of the sampling pulses, the binary value of each character element. Corresponding binary indication values are stored in an intermediate memory at an addressed location associated with the receiving terminal equipment and from there are transferred cyclically by a read-out device to a regeneration device corresponding to the receiving terminal equipment. From the indication values the regeneration device forms data signals which change value in synchronism with the indication signals.

REFERENCES:
patent: 3764989 (1973-10-01), McClellan

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