US2208918A - Communication system - Google Patents

Description

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fnvenor /4//2-@0//1//1955/70" y ffamey Patented July 23, 1940 PATENT ol-FlcE COMIWUNICATION SYSTEM Alfred Wiessner, Berlin, Germany, assignor to C. Lorenz Aktiengesellschaft, Berlin-Tempelhof,

Germany, a company Application June 9, 1

In Germany 2 Claims.

The present invention relates to communication systems, and more specifically to wire-radio systems operating with carrier frequency intelligence transmission over telephone lines.

5 It is a known expedient to connectI the incom ing and outr qinglineaof a Y vo re exchange om'ce to u.- devifsjthereof. Such dEVie-crps'' al plurality of terminal strips arranged in racks or frames a connecting the incoming lines and the leads pertaining to the further circuit elements and switching means of the exchange oce.

Certain difficulties have been experienced in connection with the recently generalized simultaneous utilization of telephone system subscriber lines for high frequency current transmission, such as wire-radio, alarming and the like, and these difficulties are particularly introduced on account of restricted space conditions and the great number of wirings required for the necessary interconnections.

Propositions have been made in the past to apply the high frequency oscillations to the selector equipments of such exchanges and to provide the electric separating lters either in the selector racks or in particular racks or frames adapted for this purpose, but this expedient requires a great number of interconnections in addition to the low frequency lines already present in the system. The invention has for its object to avoid these disadvantages. This is accomplished according to the present invention by so arranging the high frequency portion that the high frequency oscillations which are to be applied to the outgoing subscriber lines of a telephone system argimzressdim n'iguig'se` lines im'stliting de utiliing amat-Wanting devices in a manner which permits the high frequency oscillations to be duly impressed with a minimum expenditure of additional connections.

The invention will be more readily understood from the following description taken in conjunction with the accompanying drawing, in 45 which Fig. 1 is a perspective view of a main distributor rack or frame, Fig. 2 illustrates a partially sectioned side elevation of one embodiment of a 5o terminal strip according to the invention, Fig. 3 is a front elevation of the terminal strip shown in Fig. 2, while Fig. 4 is a top view of the same terminal strip.

Referring to Fig. 1, V denotes the main distributor rack or frame which is adapted to re- 938, Serial No. 212,665 June 15, 1937 ceive a plurality of terminal strips L more precisely shown in the Figs. 2 to 4.

A terminal strip according to the present invention is shown in the Figs. 2 to 4 and comprises a base plate I carrying at its rear a box 2 enclosing the circuit elements, i. e. inductances and capacities, of the electric separating lters allotted to the individual lines. The front of the base plate I carries two bars or ribs 3 and 4 of insulation, each of which is provided with three arrays of soldering tabs 5, 6, l and 8, 9, I0, respectively. For instance, the subscriber lines may be connected to the soldering tabs of the arrays 5, 6 and l, while the tabs of the arrays 8, 9 and l0 are connected to the leads pertaining to the exchange equipment. Each of said arrays generally comprises twenty soldering tabs. A covering plate or disc I I is attached to the upper ends of said bars and serves as support for soldering tabs over Which the high frequency currents are impressed upon the system. One of the soldering tabs I2 of this plate is allotted to each three-wire group of subscriber lines terminated at the soldering tabs of the bar 3. The high frequency currents are applied to the terminal strip over soldering tabs I3 interconnected in groups by conductors I4 as shown in Fig. 3, and each of said groups is fed by high frequency currents of different amplitudes. In cases that it is desired to supply a pair of wires with specific high frequency currents accommodated to the length of said wire lines, a short connection is established between the appertaining soldering tab of array I2 and the conductor I4 conducting the high frequency current of corresponding amplitude. Such short connection is indicated at I5 of Fig. 3.

The electric separating filters arranged in the box 2 are then to be wired in such manner that the low frequency input circuit of the filter is connected to the inwardly projecting part of the soldering tabs which are associated with the incoming leads, that the high frequency input circuit of the corresponding filter is connected to the appertaining soldering tabs of the array I2, and that the output circuit of the filter is connected to the inwardly projecting parts of the soldering tabs allotted to the outgoing leads. The device is also provided with the usual voltage cut-out equipments. The soldering tabs may be fixed in the bars 3 and 4 during the moulding process thereof.

'Ihe arrangement according to the invention heretofore described involves the advantage that a Very low number of connections is required separating ltersfcircmtconrrc'ons conducting high frequency oscillations adapted to be applied to said lines, and terminal strips comprising a base plate, means for supporting said iilters on the rear of said base plate, two extended bars of insulation, and solderin tabs arranged in arrays in said bars, and adapted to interconnect said lines, equipments, lters and circuit connections, the soldering tabs of one bar being connected to the separating filter input side and the soldering tabs of the other bar to the separating 5 lter output side.

2. In a communication system a telephone exchange as defined in claim 1, having a covering plate xed on said bars, and soldering tabs in said plate for applying high frequency 10 oscillations.

ALFRED WIESSNER.

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