US2208917A

US2208917A - High frequency system

Info

Publication number: US2208917A
Application number: US201715A
Authority: US
Inventors: Wiessner Alfred
Original assignee: Standard Elektrik Lorenz AG
Current assignee: Alcatel Lucent Deutschland AG; C Lorenz AG
Priority date: 1937-04-13
Filing date: 1938-04-13
Publication date: 1940-07-23
Anticipated expiration: 1957-07-23
Also published as: GB497534A; BE427559A; CH203270A; FR836524A

Description

July 23,194& A. WIESSNER 2,298,917

HIGH FREQUENCY SYSTEM Filed April 13, 1938 Patented July 23, 1940 UNITED STATES HIGH FREQUENCY SYSTEM Alfred Wiessner, Berlin, Germany, assignor to C. Lorenz Aktiengesellschaft, Berlin-Tempelhof,

Germany, a company Application April 13, 1938, Serial No. 201,715 In Germany April 13, 1937 4 Claims.

The present invention relates to high frequency systems, and more particularly to selector rack arrangements in such systems as generally employed in telephone exchange stations.

It is well known to efiect intelligence transmission by means of high frequency carrier currents, and to impress a plurality of carrier waves upon the telephone lines in an exchange station. Systems of the above mentioned type require the provision of electric separating filter devices so as to permit the high frequency and the low frequency message currents to be impressed upon the transmission channel common thereto. It has been suggested in the past to employ specific racks adapted to receive particular groups of electric separating filters, which consist of suitably interconnected capacities and inductances, but this expedient introduces certain disadvantages since it will be hardly possible on account of the restricted space conditions inordinary exchange offices to stow the great number of wires required for interconnecting the lines and the electric filter devices.

The present invention has for its object to avoid the aforesaid difficulties by arranging the filter devices directly in the selector racks and in close proximity to the appertaining sets or groups of selector switches and relays, so as to permit connecting wires of short lengths to be used.

The invention will be more readily understood from the following description taken in conjunction with the accompanying drawing, in which:

Fig. 1 is afront elevation of an arrangement according to the invention; Fig. 2 is a side elevation of the arrangement shown in Fig. 1; while Fig, 3 shows a suitable wiring arrangement according to the invention.

In Figs. 1 and 2, l denotes a rack or frame carrying horizontal cross bars I which serve as support for 10 to 15 selector switches 2 and their pertaining sets of relays 3. The selector and relay sets or groups are attached to one side of the rack, while the lines 5 which are to be conabove the small boxes in which the electric filters 6 are placed.

The above described arrangement involves the advantage that the high frequency oscillations may be applied to existing racks or frames and, 5 moreover, that the wiring in these racks will become extraordinarily simple. In addition, each filter device is fixed to its appertaining group or set of selectors and relays, an expedient which enables reliable supervision of the system and a 10 considerably simplified wiring between the various elements. I

The Fig. 3, by way of an example, illustrates the simple wiring conditions attained in accordance with the invention. The wires to the con- 15 tacts t of the cut-oif relay (not shown) which is allotted to the ore-selector circuits, are connected to the speech wires (12 and D2 of the final switch, and to the subscribers line a, bat the terminal strips of the pre-selector frame. The 20 wires which are extended to the subscribers line over the main distributor are looped through an exchange filter by a simple wiring change. The lines a, b are associated with the output side of the electric filter and the high frequency os- 25 cillations are impressedover the conductors al, bl.

What is claimed is:

1. In a telephone exchange system, selector switches arranged in groups, high and low fre- 30 quency separating filters also arranged in groups corresponding to said selector groups, a plurality of two wire telephone lines arranged in groups corresponding to said switches and filters, each line having a filter associated therewith, a unitary supporting frame having a plurality of racks one for each of said groups of switches filters and lines, whereby each filter is mounted immediately adjacent the common connections between the associated selectors and lines.

2. In a telephone exchange system, preselector switches arranged in linear groups, control relays arranged in linear groups corresponding to said switches, high and low frequency separating filters arranged in linear groups corresponding to said switches and relays, a plurality of two wire telephone lines arranged in groups corresponding to said switches relays and filters, a unitary supporting frame having a plurality of Tacks one for each. group of switches, relays filters and lines, whereby each filter is mounted immediately adjacent the corresponding switches relays and lines.

3. A telephone exchange system according to claim 2 in which the two Wire lines and associsubscribers lines and through which the subscribers lines are connected to the contacts of the associated cut-off relay, said subscribers lines being connected to the low frequency output end of the associated filter, a high frequency line connected to the input of each filter, said lines filters relays and selectors being arranged in corresponding linear groups, and a unitary supporting frame having supporting racks for said lines filters relays and switches, whereby each filter can be mounted immediately adjacent the associated relays and pre-selector switches.

ALFRED WIESSNER.