GB1363553A - Telegraphic keying circuits - Google Patents
Telegraphic keying circuitsInfo
- Publication number
- GB1363553A GB1363553A GB3101572A GB3101572A GB1363553A GB 1363553 A GB1363553 A GB 1363553A GB 3101572 A GB3101572 A GB 3101572A GB 3101572 A GB3101572 A GB 3101572A GB 1363553 A GB1363553 A GB 1363553A
- Authority
- GB
- United Kingdom
- Prior art keywords
- current
- subscriber
- anl
- line
- contact
- 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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0264—Arrangements for coupling to transmission lines
- H04L25/028—Arrangements specific to the transmitter end
- H04L25/0282—Provision for current-mode coupling
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/12—Compensating for variations in line impedance
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0264—Arrangements for coupling to transmission lines
- H04L25/0272—Arrangements for coupling to multiple lines, e.g. for differential transmission
Abstract
1363553 Telegraph keying circuits SIEMENS AG 3 July 1972 [2 Aug 1971] 31015/72 Heading H4P Single current signalling in a subscriber teleprinter connection line AnL is effected by a keying contact bk which in one position (as shown) connects the battery TB to the line AnL, and in the other position simultaneously cuts off the battery and shorts the line AnL through a diode, D in parallel with the RC circuit R1, C1. The keying contact bk is operated by a receiving relay B responsive to double current signals from a trunk FL. The diode D permits current to flow to discharge the capacitance of the line AnL; and the capacitance rings with the inductance of a receiving magnet EM connected to the line and thereby accelerates dropout thereof by cancelling remanent magnetism. The diode D is blocked during ringing. A resistor R2 across C1 is larger than R1 and discharges C1 when the keying contact is switched back to the position shown by a suitable double current signal received at B. The diode D also serves to decouple the subscriber line AnL when it is disconnected, and is therefore exhibiting voltage and current fluctuations, from the transmitting relay AI, AII in order to prevent erroneous operation thereof. The transmitting relay AI, AII operates contact a in response to subscriber teleprinter key sk, to send double current signals to the trunk, FL. The current in the subscriber connection line AnL, when bk is as shown, is kept constant by an automatic control circuit K, which also serves to conduct holding current for transmitter relay AI when bk cuts off the subscriber line AnL. The latter function may be performed by an adjustable extension line resistor (R H , Figs 3, 4, not shown); and contact bk may be replaced by a pair of simultaneously operated contacts (bk1, bk2).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2138576A DE2138576C3 (en) | 1971-08-02 | 1971-08-02 | Converter circuit for transmitting direct current telegraphic characters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1363553A true GB1363553A (en) | 1974-08-14 |
Family
ID=5815523
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3101572A Expired GB1363553A (en) | 1971-08-02 | 1972-07-03 | Telegraphic keying circuits |
Country Status (16)
| Country | Link |
|---|---|
| JP (1) | JPS5238683B2 (en) |
| AT (1) | AT323246B (en) |
| AU (1) | AU459938B2 (en) |
| BE (1) | BE787088A (en) |
| BR (1) | BR7205196D0 (en) |
| CA (1) | CA973804A (en) |
| CH (1) | CH542556A (en) |
| DE (1) | DE2138576C3 (en) |
| DK (1) | DK144109C (en) |
| FR (1) | FR2148210B1 (en) |
| GB (1) | GB1363553A (en) |
| IT (1) | IT963475B (en) |
| LU (1) | LU65824A1 (en) |
| NL (1) | NL7209920A (en) |
| SE (1) | SE373252B (en) |
| ZA (1) | ZA724772B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49124377U (en) * | 1973-02-28 | 1974-10-24 | ||
| JPS5494218A (en) * | 1978-01-09 | 1979-07-25 | Fuji Electric Co Ltd | Dc pulse read-in circuit |
| DE2833732C2 (en) * | 1978-08-01 | 1981-12-03 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Circuit arrangement for the transmission of direct current telegraph characters |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1090253B (en) * | 1959-07-17 | 1960-10-06 | Siemens Ag | Circuit arrangement for telephone subscriber stations with indirect control of the receiving magnet |
| DE1216919B (en) * | 1966-01-25 | 1966-05-18 | Telefunken Patent | Circuit arrangement to keep the current constant and to guarantee the zero line symmetry of double-stream telegraphic characters |
| DE2035379C3 (en) * | 1970-07-16 | 1975-10-09 | Siemens Ag | Circuit arrangement for setting the line current in telegraph subscriber connection circuits of a switching system |
-
0
- BE BE787088D patent/BE787088A/en unknown
-
1971
- 1971-08-02 DE DE2138576A patent/DE2138576C3/en not_active Expired
-
1972
- 1972-06-20 CH CH922872A patent/CH542556A/en not_active IP Right Cessation
- 1972-06-20 AT AT531972A patent/AT323246B/en not_active IP Right Cessation
- 1972-07-03 GB GB3101572A patent/GB1363553A/en not_active Expired
- 1972-07-12 ZA ZA724772A patent/ZA724772B/en unknown
- 1972-07-12 AU AU44504/72A patent/AU459938B2/en not_active Expired
- 1972-07-17 SE SE7209383A patent/SE373252B/xx unknown
- 1972-07-18 NL NL7209920A patent/NL7209920A/xx not_active Application Discontinuation
- 1972-07-28 IT IT27561/72A patent/IT963475B/en active
- 1972-07-28 JP JP47075822A patent/JPS5238683B2/ja not_active Expired
- 1972-07-31 LU LU65824A patent/LU65824A1/xx unknown
- 1972-08-01 DK DK380372A patent/DK144109C/en not_active IP Right Cessation
- 1972-08-01 CA CA148,400A patent/CA973804A/en not_active Expired
- 1972-08-02 BR BR005196/72A patent/BR7205196D0/en unknown
- 1972-08-02 FR FR7227905A patent/FR2148210B1/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| AU4450472A (en) | 1974-01-17 |
| FR2148210A1 (en) | 1973-03-11 |
| IT963475B (en) | 1974-01-10 |
| DE2138576C3 (en) | 1978-05-11 |
| CA973804A (en) | 1975-09-02 |
| DE2138576B2 (en) | 1977-09-01 |
| CH542556A (en) | 1973-09-30 |
| FR2148210B1 (en) | 1977-07-29 |
| DK144109C (en) | 1982-05-24 |
| JPS4825403A (en) | 1973-04-03 |
| LU65824A1 (en) | 1973-01-31 |
| DE2138576A1 (en) | 1973-02-22 |
| DK144109B (en) | 1981-12-07 |
| NL7209920A (en) | 1973-02-06 |
| BR7205196D0 (en) | 1973-05-29 |
| SE373252B (en) | 1975-01-27 |
| AT323246B (en) | 1975-06-25 |
| JPS5238683B2 (en) | 1977-09-30 |
| AU459938B2 (en) | 1975-04-10 |
| ZA724772B (en) | 1973-04-25 |
| BE787088A (en) | 1973-02-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |