GB301844A - Improvements in or relating to telephone systems - Google Patents
Improvements in or relating to telephone systemsInfo
- Publication number
- GB301844A GB301844A GB36044/28A GB3604428A GB301844A GB 301844 A GB301844 A GB 301844A GB 36044/28 A GB36044/28 A GB 36044/28A GB 3604428 A GB3604428 A GB 3604428A GB 301844 A GB301844 A GB 301844A
- Authority
- GB
- United Kingdom
- Prior art keywords
- current
- outfit
- battery charging
- battery
- ringing
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/0008—Selecting arrangements using relay selectors in the switching stages
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
301,844. Associated Telephone & Telegraph Co. Aug. 13, 1927, [Convention date]. Divided on 295,572. Drawings to Specification. Charging batteries.-A tone-current and battery charging outfit for use in small telephone exchanges is operated solely by relays and comprises busy and ringing current arrangements.. Alternating or direct current supply may be used for feeding the outfit, which comprises a polarized relay adapted to cause the generation of alternating current for ringing purposes, and to convert A.C. to D.C. for battery charging when no connection exists. Each movement of the relay armature automatically reverses the current through the operating windings. Battery charging is automatically initiated on the termination of a connection, and terminates on the initiation of a call or when the battery is fully charged. The outfit described is identical with that disclosed in part of Specification 295,572. Specification 301,843 also is referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE301844X | 1927-08-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB301844A true GB301844A (en) | 1929-06-20 |
Family
ID=3867437
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8847/28A Expired GB295572A (en) | 1927-08-13 | 1928-03-23 | Improvements in or relating to telephone systems |
GB36044/28A Expired GB301844A (en) | 1927-08-13 | 1928-03-23 | Improvements in or relating to telephone systems |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8847/28A Expired GB295572A (en) | 1927-08-13 | 1928-03-23 | Improvements in or relating to telephone systems |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR668098A (en) |
GB (2) | GB295572A (en) |
-
0
- FR FR668098D patent/FR668098A/fr not_active Expired
-
1928
- 1928-03-23 GB GB8847/28A patent/GB295572A/en not_active Expired
- 1928-03-23 GB GB36044/28A patent/GB301844A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB295572A (en) | 1929-06-24 |
FR668098A (en) | 1929-11-07 |
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