US2235058A - Carrier frequency communication system - Google Patents

Carrier frequency communication system Download PDF

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Publication number
US2235058A
US2235058A US223019A US22301938A US2235058A US 2235058 A US2235058 A US 2235058A US 223019 A US223019 A US 223019A US 22301938 A US22301938 A US 22301938A US 2235058 A US2235058 A US 2235058A
Authority
US
United States
Prior art keywords
frequency
low
telephone
carrier frequency
terminal strip
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US223019A
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English (en)
Inventor
Wiessner Alfred
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alcatel Lucent Deutschland AG
C Lorenz AG
Original Assignee
Standard Elektrik Lorenz AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Standard Elektrik Lorenz AG filed Critical Standard Elektrik Lorenz AG
Application granted granted Critical
Publication of US2235058A publication Critical patent/US2235058A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/65—Arrangements characterised by transmission systems for broadcast
    • H04H20/76—Wired systems
    • H04H20/77—Wired systems using carrier waves
    • H04H20/81—Wired systems using carrier waves combined with telephone network over which the broadcast is continuously available
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
    • B64D17/00—Parachutes
    • B64D17/40—Packs
    • B64D17/52—Opening, e.g. manual
    • B64D17/54—Opening, e.g. manual automatic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/02—Constructional details
    • H04Q1/14—Distribution frames

Definitions

  • the present invention relates to carrier frequency communication systems, and more specifically to arrangements in telephone systems effecting wired radio frequency message transmission.
  • the incoming lines to telephone exchanges are generally terminated in a so-called main distributor which customarily consists of a plurality of terminal strip assemblies in which the telephone lines are-wired with the exchange equipment, such as selectors, for example.
  • the carrier frequency line In addition to the interposition of the low-pass filters in the telephone lines serving various purposes, the carrier frequency line must be connected through high-pass filters and this is generally accomplished likewise in the main distributor. Numerous problems call for the attention of the experts when the possibilities of arranging the filters in the main distributor are to be considered, and these problems are by no means restricted to problems of construction since certain conditions must be taken in account which are of great importance for securing relevant operation. It is the main object of the present invention to provide means which enable a simple solution of all such problems.
  • the high-frequency message current is, as heretofore proposed, applied to the main distributor of such telephone exchange, and the terminal strip assemblies provided in this main distributor are so designed that a minimum of additional interconnecting leads is required for applying the high-frequency current and, moreover, that neither the high-frequency path becomes interrupted in cases'when the low-frequency is cut oil nor that the low-frequency path is interrupted when the high-frequency is disconnected.
  • FIG. 1 schematically illustrates a wiring diagram according to the invention
  • Fig. 2 is a cross section through a terminal strip assembly according to one feature of the invention
  • Fig. 3 is the side elevation of the arrangement shown in Fig. 2
  • Fig. 4 represents a further embodiment as a modification of the arrangement shown in Fig. 2
  • Fig. 5 shows a modification over the arrangement as disclosed in Fig. 1'.
  • the cores of the telephone lines are connected to the terminal strip assembly the soldering tabs of which are denoted I.
  • the terminal strip assemblies are located in the main distributor. Further soldering tabs 2 like wise fixed in the terminal strip assembly serve for establishing connections to the selector devices forming part of the exchange equipment.
  • the low-pass filter 3 which has for its object to block the telephone line against high-frequency interference voltages set up at the contacts of the selector or exchange equipment and to protect the selector equipment against high-frequency oscillations which are impressed upon the telephone line, is interposed between said soldering tabs l and 2.
  • the aforementioned low-pass filter which, for instance, may be designed as a so-called 1r-circuit comprises two inductances 5 and 6 connected in series with the line and shunted by two condensers l and 8 in serial relation to one another.
  • the mid-point between these condensers may be earthed at E.
  • High-frequency oscillations are applied through condensers 9 and [0 which simultaneously constitute one shunt capacity member of the low-pass filter since these condensers are likewise bridged between the lines.
  • the high-frequency oscillations reach these coupling condensers over suitable tapping points of a transformer H.
  • the above described circuit arrangement according to Fig. 1 is placed in a box and the appropriate number of such boxes is arranged in a terminal strip assembly shown in the Figs. 2 and 3 which, for example, is adapted to receive twenty such box devices.
  • the terminal strip assembly l2 in the Figs. 2 and 3 comprises a box-shaped casing at the upper edge of which pairs of soldering tabs are arranged in a row or rows in which the subscribers lines are terminated.
  • At the opposite end of the terminal strip box further 20 pairs of soldering tabs are fixed in a row or rows to which the connecting leads to the selector equipment are connected.
  • the low-pass filters schematically indicated in Fig.
  • each low-pass filter device is mounted in a small box l3 which carries at one end a number of connector plugs with which the filter elements are connected. These connector plugs may be inserted in corresponding connector sockets I4 fixed in said housing so as to interpose the filter element in the appertaining telephone line.
  • the condensers 9 and ID are mounted together in the configuration of a small plug shown at 15 in Fig. 3, or at IS in Fig. 4.
  • Each plug-shaped condenser member l5 carries suitable contact surfaces, e. g. at its outer circumference, and these contact members are adapted to establish electric connection with appropriate contact surfaces arranged in the interior of the aperture or opening receiving said condenser member l5.
  • the last mentioned contact surfaces are connected individually to a number of tapping points of the secondary winding of the transformer H indicated in Fig. 2 and Fig. 1. It is thus possible by adjusting or interchanging the member I5 to select the necessary voltage for transmission.
  • the interruption of the low-frequency line or lines is thus accomplished in a very simple manner by removing one of said low-pass filter boxes 13 without disconnecting the high-frequency supply impressed through the transformer II and the condenser member l5.
  • Telephone lines which are not utilized for more than one purpose neither require a low-pass not a high-pass filter, so that a short-circuiting plug device is adapted to substitute the low-pass filter allotted to such lines.
  • the low-pass filter comprises a filter member which is designed as a so-called H-circuit and the high-frequency oscillations are applied through a high-frequency transformer I I in which a condenser is included so as to interrupt a direct current path.
  • a telephone system means for interconnecting a plurality of subscriber lines for communication by carrier frequency currents and Voice frequency currents
  • a terminal strip comprising a subscriber line connecting tabs, exchange equipment tabs, and carrier input means.
  • permanently mounted on said terminal strip removable high pass filter means and low pass filter means mounted on said terminal strip to interconnect respectively said carrier input means and said subscriber line, and said exchange equipment tabs and said subscriber line, and mean holding said permanently mounted elements all in fixed relation and provided with connections whereby insertion of said high pass filter will complete a circuit for said carrier frequency to said subscriber line, and insertion of said low pass filter will complete a connection for said exchange tabs to said subscriber line.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Signal Processing (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Filters And Equalizers (AREA)
  • Telephonic Communication Services (AREA)
US223019A 1937-08-05 1938-08-04 Carrier frequency communication system Expired - Lifetime US2235058A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEL93022A DE722609C (de) 1937-08-05 1937-08-05 Anordnung fuer Telefonnetze, in denen ausser der niederfrequenten noch eine traegerfrequente Nachrichtenuebermittlung erfolgt, insbesondere fuer Drahtfunksysteme
DEL93947A DE756081C (de) 1937-08-05 1938-01-05 Anordnung fuer Telefonnetze, in denen ausser der niederfrequenten noch eine traegerfrequente Nachrichtenuebermittlung erfolgt, insbesondere Drahtfunksystem

Publications (1)

Publication Number Publication Date
US2235058A true US2235058A (en) 1941-03-18

Family

ID=91759061

Family Applications (2)

Application Number Title Priority Date Filing Date
US223019A Expired - Lifetime US2235058A (en) 1937-08-05 1938-08-04 Carrier frequency communication system
US250460A Expired - Lifetime US2212256A (en) 1937-08-05 1939-01-12 Intercommunication system

Family Applications After (1)

Application Number Title Priority Date Filing Date
US250460A Expired - Lifetime US2212256A (en) 1937-08-05 1939-01-12 Intercommunication system

Country Status (7)

Country Link
US (2) US2235058A (enrdf_load_stackoverflow)
BE (1) BE431606A (enrdf_load_stackoverflow)
CH (1) CH205372A (enrdf_load_stackoverflow)
DE (2) DE722609C (enrdf_load_stackoverflow)
DK (1) DK59606C (enrdf_load_stackoverflow)
FR (2) FR841645A (enrdf_load_stackoverflow)
NL (1) NL51936C (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
DE722609C (de) 1942-07-13
FR50085E (fr) 1939-11-20
US2212256A (en) 1940-08-20
FR841645A (fr) 1939-05-24
NL51936C (nl) 1942-02-16
DE756081C (de) 1953-09-07
DK59606C (da) 1942-03-30
CH205372A (de) 1939-06-15
BE431606A (enrdf_load_stackoverflow) 1939-01-31

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