GB1304703A - - Google Patents
Info
- Publication number
- GB1304703A GB1304703A GB1026470A GB1026470A GB1304703A GB 1304703 A GB1304703 A GB 1304703A GB 1026470 A GB1026470 A GB 1026470A GB 1026470 A GB1026470 A GB 1026470A GB 1304703 A GB1304703 A GB 1304703A
- Authority
- GB
- United Kingdom
- Prior art keywords
- current
- line
- telegraphic
- signals
- relay
- 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
- H04L25/20—Repeater circuits; Relay circuits
- H04L25/22—Repeaters for converting two wires to four wires; Repeaters for converting single current to double current
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Interface Circuits In Exchanges (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
1304703 Telegraphic exchanges SIEMENS AG 4 March 1970 [5 March 1969] 10264/70 Heading H4P In a telegraphic exchange line circuit for connecting a single-current subscriber's line to a double-current exchange circuit, telegraphic signals received on the subscriber's two-wire line (shown on the left hand side in Fig. 4) appear across resistor Rl, mark signals turning on transistor T to cause current to flow through R5 and one way through relay A and space signals turning off transistor T to cause current to flow through R6 and the other way through relay A. Relay A repeats the telegraphic signals on to a double-current circuit of the exchange. The invention is characterized by the provision of capacitor C1 and resistor R1 which are large compared with any line capacitance or resistance to which the line circuit may be selectable connected thereby reducing distortion of the double-current signals. Distortion is further reduced by suitable adjustment of the trigger threshold of transistor T determined by resistor R3. In Fig. 4 contact b of relay B transmits telegraphic signals to the subscriber after a calling signal polarity reversal on the line by contacts U1, U2. The arrangement shown ensures no disturbance of the current through resistor R1 during transmission.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19691911252 DE1911252C3 (en) | 1969-03-05 | Circuit arrangement for equalizing flattened single-stream telegraph signals in telecommunications systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1304703A true GB1304703A (en) | 1973-01-31 |
Family
ID=5727239
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1026470A Expired GB1304703A (en) | 1969-03-05 | 1970-03-04 |
Country Status (8)
Country | Link |
---|---|
BE (1) | BE746908A (en) |
BR (1) | BR7017217D0 (en) |
CH (1) | CH505516A (en) |
FR (1) | FR2037649A5 (en) |
GB (1) | GB1304703A (en) |
LU (1) | LU60445A1 (en) |
NL (1) | NL7002529A (en) |
SE (1) | SE365086B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2310668A1 (en) * | 1975-05-06 | 1976-12-03 | Desieter Rene | Teleprinter translator with relay circuit - uuses relay circuit to allow use of remote terminal without earth point and has connections to mid point of batteries |
-
1970
- 1970-02-23 NL NL7002529A patent/NL7002529A/xx unknown
- 1970-02-27 CH CH288070A patent/CH505516A/en not_active IP Right Cessation
- 1970-03-03 LU LU60445D patent/LU60445A1/xx unknown
- 1970-03-04 SE SE286070A patent/SE365086B/xx unknown
- 1970-03-04 GB GB1026470A patent/GB1304703A/en not_active Expired
- 1970-03-04 BR BR21721770A patent/BR7017217D0/en unknown
- 1970-03-05 FR FR7007860A patent/FR2037649A5/fr not_active Expired
- 1970-03-05 BE BE746908D patent/BE746908A/en unknown
Also Published As
Publication number | Publication date |
---|---|
DE1911252A1 (en) | 1970-09-17 |
SE365086B (en) | 1974-03-11 |
NL7002529A (en) | 1970-09-08 |
FR2037649A5 (en) | 1970-12-31 |
BE746908A (en) | 1970-09-07 |
CH505516A (en) | 1971-03-31 |
LU60445A1 (en) | 1970-05-04 |
DE1911252B2 (en) | 1977-03-03 |
BR7017217D0 (en) | 1973-01-04 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PLNP | Patent lapsed through nonpayment of renewal fees |