Patent GB-989368-A (GB)
Title: Improvements in or relating to time-division multiplex telecommunications systems
IPC: B23Q5/36
Filed: 1962-06-26
Abstract: 989,368. Automatic exchange systems. SIEMENS & HALSKE A.G. June 26, 1962 [June 29, 1961; Nov. 16, 1961; April 2, 1962 (2)], No. 24446/62. Heading H4K. In a system comprising a plurality of time division highways, connections between subscribers associated with different highways are established by simultaneously pulsing the subscribers gates and an inter-highway gate; and connections between subscribers associated with the same highway are established via this highway and one of a further group of highways, having associated therewith a plurality of storage elements which are used to bridge over two time positions allocated to the respective subscribers. As shown, groups of subscribers 1Tn ... yTn may be connected via gates (not shown) to highways SM1 ... SMy, the gates being opened by pulses emitted from appropriate combinations of circulating stores, each reference F1, F2 ... representing a group of circulating stores associated with the highway. A connection between subscribers in groups 1Tn, 2Tn is thus effected by inserting a pulse in the appropriate store combinations of F1 and F2 and also in store combination J1 indicative of the address of gate 1k1 which is thus opened in the same pulse position to complete the connection. In the case of a call between two subscribers in the same group, say 1Tn the subscribers are allocated two different pulse positions which are written into the appropriate store combinations in F1. The pulses are also written into the store combination of J1 indicative of a gate such as (y+1)k1 leading to a highway M1. This highway gives access to condenser stores 1Co, any one of which may be chosen, the two pulses being written into the store combination of G1 indicative of such a condenser. Each subscriber's line circuit may contain a condenser and inductance, whereby energy transfer between it and the chosen condenser 1Co may take place at the appropriate time position, the condenser 1Co serving to bridge over the time between the pulse positions allocated to the two subscribers. The figure also illustrates groups of inter-exchange lines 1Ln, wLn connections between lines of different groups being established directly via an interhighway gate such as hlkhw, or via an intermediate highway Mzz having gate connections to both highways Ml1, Mlw. Connections between interexchange lines and subscribers highways are similarly effected via intermediate highways such as Mz1 (although in another embodiment, Figs. 3, 2 (not shown) each highway associated with interexchange lines has a single gate connection with each subscriber's highway). Interconnections between interexchange lines associated with the same highway takes place via a condenser such as 1Co, using two time positions. The condenser storage means may be also used to establish connections between different highways when the two highways have no common free pulse position. The highways may be of the two- or four-wire type examples of gating arrangements for the latter being given in Fig. 4 (not shown). Specification 981,336 is referred to.