GB1098860A - Improvements in or relating to telecommunications exchange systems - Google Patents

Abstract

1,098,860. Telegraphy. SIEMENS A.G. July 5, 1966 [July 6, 1965], No. 30039/66. Heading H4P. In a telegraph exchange of the type in which each bit is transmitted simultaneously on a combination of channels unique to a particular unit in the exchange, each calling subscriber's transmitter can be set to only a number of combinations less than the total number used in the exchange. As described, when a subscriber Tnl wishes to communicate with another, e.g. Tn500, dialling pulses from Tnl cause unit ZES to seize one of a number of magnetic core connector sets which form unit ZVS; the number of connector sets is less than the number of subscribers. Unit ZES also sets the connector set transmitter to transmit on a combination of channels representative of the called receiver KS500 in decimal code, and sets the transmitter KS 1 of the calling subscriber to transmit on a combination SV representing the seized connector unit in excess-3 code. Data from Tn1 then passes from KS1 via unit UCS, which converts the excess-3 code to decimal, to the selected connector set. From thence it passes over channels L to unit UCE, which converts from decimal to excess-3 combinations, and over the multichannel line EV to the receiver KE500 of the called subscriber Tn500. The channels may be different frequencies or separate leads.