GB487339A - Device for receiving and retransmitting signals in long distance telephone lines - Google Patents

Device for receiving and retransmitting signals in long distance telephone lines

Info

Publication number
GB487339A
GB487339A GB34863/36A GB3486336A GB487339A GB 487339 A GB487339 A GB 487339A GB 34863/36 A GB34863/36 A GB 34863/36A GB 3486336 A GB3486336 A GB 3486336A GB 487339 A GB487339 A GB 487339A
Authority
GB
United Kingdom
Prior art keywords
relay
current
ringing
relays
repeater
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
Application number
GB34863/36A
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.)
APPLIC TELEPHONIQUES SOC D
Original Assignee
APPLIC TELEPHONIQUES SOC D
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 APPLIC TELEPHONIQUES SOC D filed Critical APPLIC TELEPHONIQUES SOC D
Publication of GB487339A publication Critical patent/GB487339A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/442—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies
    • H04Q1/4423—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies using one signalling frequency

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

487,339. Repeaters. SOC. D'APPLICATIONS TELEPHONIQUES. Dec. 18, 1936, No. 34863. Convention date, Jan. 16. [Class 40 (iv)] In a repeater with means for relaying ringing- current, the incoming ringing-current which is of substantially greater amplitude than speech currents is applied directly or through a rectifier to a valve in the speech path, and the change in anode current operates a direct-current relay to connect up a new source. As shown in Fig. 1, the speechamplifying valve 3 is worked on the lower bend of its characteristic and the reception of ringing-current operates relay 5 to connect up the new source. To prevent excess voltages of ringing-current from damaging the valve, a rectifier network is included in the input circuit and is biassed by a resistance 9 in the anode circuit so that the resistance of the network increases with applied voltage. Other arrangements of rectifier networks having a separate biassing battery are described. Fig. 5 shows an arrangement in which the ringing- current is filtered at 14, rectified at 15, and applied to the grid of valve 3 to reduce the bias so that normally-operated relay 5 releases. Fig. 7 shows a complete two-way repeater. Relays 5, 5<1> are differential and are balanced by the normal anode currents in valves 3<1>, 3, respectively, so that relays 19, 19<1> are normally operated. Ringing-current over line L unbalances relay 5<1>, releasing relay 19<1> which operates relay 24 to connect the new source 26 to line L<1>. Relay 27 in series with relays 5, 5<1> is normally unoperated, but if oscillations occur in the repeater due to unbalance, relay 27 operates opening the biassing circuits of relays 5, 5<1> so that both operate. Relays 19, 19<1> both release so that the repeater is completely byepassed over leads 22, and an alarm circuit 28 is closed. The same result occurs if the supply voltage fails. A similar two-way repeater is also described, Fig. 8 (not shown), in which rectified ringing- currents control grid-bias as in Fig. 5.
GB34863/36A 1936-01-16 1936-12-18 Device for receiving and retransmitting signals in long distance telephone lines Expired GB487339A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR812623T 1936-01-16

Publications (1)

Publication Number Publication Date
GB487339A true GB487339A (en) 1938-06-20

Family

ID=27799319

Family Applications (1)

Application Number Title Priority Date Filing Date
GB34863/36A Expired GB487339A (en) 1936-01-16 1936-12-18 Device for receiving and retransmitting signals in long distance telephone lines

Country Status (3)

Country Link
DE (1) DE742805C (en)
FR (1) FR812623A (en)
GB (1) GB487339A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2915590A (en) * 1956-12-20 1959-12-01 Ericsson Telefon Ab L M Arrangement for connection and disconnection of hybrid transformers at connection between two- and fourwire lines

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE745228C (en) * 1939-07-28 1944-03-01 Siemens Ag Electrical signal receiver
NL69785C (en) * 1947-02-21
DE973493C (en) * 1950-09-28 1960-03-10 Philips Nv Single sideband carrier frequency telephone system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH129135A (en) * 1926-12-24 1928-12-01 Bell Telephone Mfg Circuit arrangement for automatic and semi-automatic telephone systems.
FR750664A (en) * 1932-05-10 1933-08-16 Lignes Telegraph Telephon Improvements to call converters for telecommunication lines

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2915590A (en) * 1956-12-20 1959-12-01 Ericsson Telefon Ab L M Arrangement for connection and disconnection of hybrid transformers at connection between two- and fourwire lines

Also Published As

Publication number Publication date
DE742805C (en) 1943-12-13
FR812623A (en) 1937-05-13

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