US2283057A - Wire carrier system - Google Patents

Wire carrier system Download PDF

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Publication number
US2283057A
US2283057A US332636A US33263640A US2283057A US 2283057 A US2283057 A US 2283057A US 332636 A US332636 A US 332636A US 33263640 A US33263640 A US 33263640A US 2283057 A US2283057 A US 2283057A
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US
United States
Prior art keywords
pass filter
jack
filters
contact
bars
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
US332636A
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English (en)
Inventor
Hagen Wolfgang
Nickel Theodor
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 US2283057A publication Critical patent/US2283057A/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

Definitions

  • Fig. l is a diagram that illustrates how telephone lines are usually connected to an exchange or central ofiice. gram showing a customary construction of separating filters.
  • Fig. 3 represents in perspective a somewhat diagrammatic fragmentary view of one embodiment of the invention.
  • Fig. 4 is a sectional side elevation of the arrangement illustrated in Fig. 3.
  • Fig. 5 is a side elevation of another embodiment of the invention.
  • the incoming lines are in general joined to a so-called main distributing frame that'comprises horizontal and vertical connection strips, designated as jack strips, through which these lines are connected to the office lines joined, for instance, to the selectors in the exchange.
  • Such strips serve for measuring and testing the incominglines.
  • A denotes a cable while B is to represent the inlet thereof.
  • a horizontal jack strip C is connected to a vertical jack strip E by a jumper Wire D.
  • a safety fuse F included in the line that is connected with a preselector G or the like.
  • Such a separating filter acts to supply the carrier frequency by means of a high-pass filter H and to prevent it by a low-pass filter L from flowing to the exchange while the low frequency telephone communication must traverse the low-pass filter without hinderance.
  • the separating filter is fitted to a vertical jack strip E the following disadvantages result.
  • the carrier frequency on its way to the subscribers fiows through the jumper lines which in a large exchange may be 100 meters long and which for reasons of service are not screened. Consequently, high frequency energy can happen to be conveyed to other lines while disturbances may be received from these.
  • the effect of the low-pass filter is in part neutralized thereby.
  • it is difiicult to supply the carrier frequency to the vertical strips because these are associated with the Fig. 2 is a circuit diafuses F. For the same reason high-pass filter and low-pass filter are difficult to arrange.
  • the width of a separating filter is made to correspond to the test plug used in systems of this kind.
  • any desired lines joined to a jack strip which is thefirst as viewed from the subscriber may be equipped with separating filters. Equally, the other dimensions of these filters are so small that the jack strip is of easy access during operation.
  • Comprising high-pass filter and low-pass filter in one device has the, advantage that the number of terminals of this device is only. six.
  • Fig. 3 shows some of the bars I of which the main distributing frame is composed, and also represents a horizontal jack strip 2, two separating filters 3, and two contact bars 4 formed with soldering tabs at both of their ends.
  • Each filter 3 comprises the high-pass filter H and the low-pass filter L shown in Fig. 2, and has a casing for these which is composed of a frame of insulating material and thin sheet metal plates which form the side walls of such casing and also serve for screening. These casings are given a width of 4 to 6.5 millimeters each.
  • the said insulating frame thereof carries plug pins 5 and a pair of contact springs 8.
  • the pins 5 are inserted in the holes of the jack strip 2, thus holding the filters in position, and are to act on contact springs B in order to interrupt low frequency paths that comprise the springs 6 and telephone lines connected to these springs in the usual manner. With the filters 3 in this position the high frequency bars 4 are engaged by the contact springs 8.
  • the bars 4 are shown in Fig. 4 to be mounted on the jack strip 2. They may, however, be located below this strip, as represented in Fig. 5. In the latter case the utilization or space is still better while the vertical dimension of the filters 3 is less than in the case of Fig. 4.
  • the bars 4 are mounted on a bracket 1 that may be of sheet metal. This bracket also serves as a guide for the filters 3.
  • the jack strip itself is employed for holdingthe filters 3 in position its springs are accessible as soon as the filters are removed from it, no separate holding device being arranged in front of the jack strip.
  • soldering tabs of the bars 4 are so long way and the high frequency energy may be supplied through a special transformer.
  • the plug pins 5 are springy to some extent and will thus overcome inaccuracies of the jack strips.
  • the vertical dimension of the separating filters is such that they do not extend beyond the level of the upper-ends of the binding posts for that the bars 4 of a jack strip can be connected with those of a neighbouring jack strip. All of the bars 4 may be connected in series and the high frequency energy may be supplied at one side of the main distributing frame. Also, any number of jack strips may be comprised in this the cables.
  • a filter rack assembly structure for a telephone exchange system which comprises, a main distributing frame in this exchange, jack strips forming part of this distributing frame, telephone lines connected to said jack strips, these strips having holes for the insertion of junction plugs, break contacts in said telephone lines, separating filters each comprising a high-pass filter section, a lowpass filter section and a casing for these sections, said filters having conductive plug pins adapted to be inserted in said holes and thereby to open the said break contacts, thus looping the low-pass filter into the telephone line connected to said break contacts, two contact bars to be supplied with high frequency energy, and contact means, carried by said filters, for connecting these bars to the high-pass filter when said plug pins are inserted in said holes.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)
US332636A 1939-05-12 1940-05-01 Wire carrier system Expired - Lifetime US2283057A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE214509X 1939-05-12

Publications (1)

Publication Number Publication Date
US2283057A true US2283057A (en) 1942-05-12

Family

ID=5819088

Family Applications (1)

Application Number Title Priority Date Filing Date
US332636A Expired - Lifetime US2283057A (en) 1939-05-12 1940-05-01 Wire carrier system

Country Status (3)

Country Link
US (1) US2283057A (de)
CH (1) CH214509A (de)
FR (1) FR868657A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2533044A (en) * 1947-06-05 1950-12-05 Ericsson Telefon Ab L M Cable distribution system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2533044A (en) * 1947-06-05 1950-12-05 Ericsson Telefon Ab L M Cable distribution system

Also Published As

Publication number Publication date
CH214509A (de) 1941-04-30
FR868657A (fr) 1942-01-12

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