GB1370163A - Telephone systems - Google Patents

Telephone systems

Info

Publication number
GB1370163A
GB1370163A GB1069572A GB1069572A GB1370163A GB 1370163 A GB1370163 A GB 1370163A GB 1069572 A GB1069572 A GB 1069572A GB 1069572 A GB1069572 A GB 1069572A GB 1370163 A GB1370163 A GB 1370163A
Authority
GB
United Kingdom
Prior art keywords
tone
transistor
winding
signal
tones
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
GB1069572A
Other languages
English (en)
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.)
Siemens Corp
Original Assignee
Siemens Corp
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 Siemens Corp filed Critical Siemens Corp
Publication of GB1370163A publication Critical patent/GB1370163A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Telephonic Communication Services (AREA)
GB1069572A 1971-03-11 1972-03-08 Telephone systems Expired GB1370163A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2111787 1971-03-11

Publications (1)

Publication Number Publication Date
GB1370163A true GB1370163A (en) 1974-10-16

Family

ID=5801255

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1069572A Expired GB1370163A (en) 1971-03-11 1972-03-08 Telephone systems

Country Status (9)

Country Link
AT (1) AT323811B (enExample)
BE (1) BE780525A (enExample)
CH (1) CH541914A (enExample)
DE (1) DE2111787B1 (enExample)
FR (1) FR2129593A5 (enExample)
GB (1) GB1370163A (enExample)
IT (1) IT956223B (enExample)
LU (1) LU64933A1 (enExample)
NL (1) NL7202872A (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2130849A (en) * 1982-11-17 1984-06-06 Lake Electronics Ltd Apparatus for delivering a signal on a telephone line

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4028498A (en) * 1974-10-07 1977-06-07 Solid State Systems, Inc. Private automatic branch exchange system and apparatus
DE3007942A1 (de) * 1980-03-01 1981-09-24 Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt Schaltungsanordnung zum einspeisen von hoertoenen
DE3014572C2 (de) * 1980-04-16 1982-12-09 Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt Schaltungsanordnung zum Senden von Niederfrequenzsignalen auf Verbindungsleitungen in Fernsprechvermittlungsanlagen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2130849A (en) * 1982-11-17 1984-06-06 Lake Electronics Ltd Apparatus for delivering a signal on a telephone line

Also Published As

Publication number Publication date
NL7202872A (enExample) 1972-09-13
IT956223B (it) 1973-10-10
DE2111787B1 (de) 1972-05-31
BE780525A (fr) 1972-09-11
CH541914A (de) 1973-09-15
AT323811B (de) 1975-07-25
LU64933A1 (enExample) 1972-07-07
FR2129593A5 (enExample) 1972-10-27

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee