GB1396768A - Ringtrip circuits - Google Patents
Ringtrip circuitsInfo
- Publication number
- GB1396768A GB1396768A GB4304072A GB4304072A GB1396768A GB 1396768 A GB1396768 A GB 1396768A GB 4304072 A GB4304072 A GB 4304072A GB 4304072 A GB4304072 A GB 4304072A GB 1396768 A GB1396768 A GB 1396768A
- Authority
- GB
- United Kingdom
- Prior art keywords
- line
- ring
- ringing
- transistor
- wire
- 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
- 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
- H04M19/026—Arrangements for interrupting the ringing current
-
- 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)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
Abstract
1396768 Ring-trip circuits PLESSEY CO Ltd 26 June 1973 [16 Sept 1972] 43040/72 Heading H4K In a ring-trip circuit which is connectible at X1, X2 to a two-wire line and which rings a magneto bell in series with a capacitor across the line, e.g. in a subscribers sub-station by applying a ringing current waveform to one wire and negative ring-return battery to the other wire, in the absence of a D.C. loopcondition at the line a sustained positive potential is generated at C2 from the ringing current waveform and this potential maintains a first transistor T1 OFF, whereas a second transistor T2 is switched ON and OFF by successive negative and positive half-cycles respectively of the ringing current waveform. Continuous ringing tone is applied to the circuit at CR to be replaced, after 300 ms., by intermittent ringing tone at IR. If the line is looped during a "silent" period, i.e. when earth is applied at X1, ring-return battery extended over the loop turns T1 and T2 ON immediately. After a delay, caused by C3 and R10, T3 is turned ON. With T2, T3 both ON, the gate comprising D5 and D6 is operated and T4 is switched OFF. Transistor T5 is accordingly driven to saturation and earth is introduced via T5 to whichever of relays CT, INT is currently operative, thereby releasing the relay and disconnecting the corresponding ringing current source. If the line is looped during a "ringing" period T1 and T2 are turned ON after a delay produced by R4, R6 and C1, and the above sequence occurs.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4304072A GB1396768A (en) | 1972-09-16 | 1972-09-16 | Ringtrip circuits |
ZA734174A ZA734174B (en) | 1972-09-16 | 1973-06-20 | Ring-trip circuits |
AU58697/73A AU471035B2 (en) | 1972-09-16 | 1973-07-30 | Ring-trip circuits |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4304072A GB1396768A (en) | 1972-09-16 | 1972-09-16 | Ringtrip circuits |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1396768A true GB1396768A (en) | 1975-06-04 |
Family
ID=10427065
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4304072A Expired GB1396768A (en) | 1972-09-16 | 1972-09-16 | Ringtrip circuits |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU471035B2 (en) |
GB (1) | GB1396768A (en) |
ZA (1) | ZA734174B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101262536B (en) * | 2007-03-07 | 2012-01-25 | 北京佳讯飞鸿电气股份有限公司 | A realization method and device for ring current and magnetic ring signal |
-
1972
- 1972-09-16 GB GB4304072A patent/GB1396768A/en not_active Expired
-
1973
- 1973-06-20 ZA ZA734174A patent/ZA734174B/en unknown
- 1973-07-30 AU AU58697/73A patent/AU471035B2/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101262536B (en) * | 2007-03-07 | 2012-01-25 | 北京佳讯飞鸿电气股份有限公司 | A realization method and device for ring current and magnetic ring signal |
Also Published As
Publication number | Publication date |
---|---|
AU5869773A (en) | 1975-01-30 |
ZA734174B (en) | 1974-05-29 |
AU471035B2 (en) | 1976-04-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |