GB1356699A - Telecommunications terminal equipments - Google Patents
Telecommunications terminal equipmentsInfo
- Publication number
- GB1356699A GB1356699A GB5425671A GB5425671A GB1356699A GB 1356699 A GB1356699 A GB 1356699A GB 5425671 A GB5425671 A GB 5425671A GB 5425671 A GB5425671 A GB 5425671A GB 1356699 A GB1356699 A GB 1356699A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tone
- key
- signals
- depressed
- sender
- 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
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/30—Systems using multi-frequency codes wherein each code element is represented by a combination of frequencies
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
- H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Telephonic Communication Services (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
- Devices For Supply Of Signal Current (AREA)
Abstract
1356699 Substation apparatus SIEMENS AG 23 Nov 1971 [5 Dec 1970] 54256/71 Heading H4K A keyboard number sender equipped for voice frequency dialling includes a bi-stable switching device (e.g. a bi-stable circuit or latching key) which when set couples the tone generator to the telephone line in such a manner that a specific tone is transmitted between each tone signal entered at the keyboard. The presence of the specific tone between tone signals in place of the usual pauses indicates to the receiving end that the tone signals relate to data rather than dialling signals. As described the sender is a push button substation transmitting dial signals in the form of dual frequency tones 2 x (1 out of 4). An additional key is provided and arranged to remain latched when depressed until the telephone handset is returned to its hook. While the key is depressed the tone combination formed from the highest frequency of each group of four is generated and coupled to line when no digit key is depressed.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19702059950 DE2059950B2 (en) | 1970-12-05 | 1970-12-05 | Circuit arrangement for subscriber stations in telecommunications, in particular telephone systems with additional data traffic |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1356699A true GB1356699A (en) | 1974-06-12 |
Family
ID=5790108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5425671A Expired GB1356699A (en) | 1970-12-05 | 1971-11-23 | Telecommunications terminal equipments |
Country Status (11)
| Country | Link |
|---|---|
| JP (1) | JPS5416166B1 (en) |
| AT (1) | AT315923B (en) |
| BE (1) | BE776231A (en) |
| CH (1) | CH538793A (en) |
| DE (1) | DE2059950B2 (en) |
| FR (1) | FR2117203A5 (en) |
| GB (1) | GB1356699A (en) |
| IT (1) | IT943714B (en) |
| LU (1) | LU64400A1 (en) |
| NL (1) | NL160134C (en) |
| SE (1) | SE364577B (en) |
-
1970
- 1970-12-05 DE DE19702059950 patent/DE2059950B2/en not_active Withdrawn
-
1971
- 1971-11-11 AT AT974971A patent/AT315923B/en not_active IP Right Cessation
- 1971-11-11 CH CH1647171A patent/CH538793A/en not_active IP Right Cessation
- 1971-11-23 GB GB5425671A patent/GB1356699A/en not_active Expired
- 1971-12-01 JP JP9710471A patent/JPS5416166B1/ja active Pending
- 1971-12-01 FR FR7143017A patent/FR2117203A5/fr not_active Expired
- 1971-12-02 NL NL7116592A patent/NL160134C/en active
- 1971-12-03 IT IT3202571A patent/IT943714B/en active
- 1971-12-03 LU LU64400D patent/LU64400A1/xx unknown
- 1971-12-03 BE BE776231A patent/BE776231A/en unknown
- 1971-12-06 SE SE1563971A patent/SE364577B/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FR2117203A5 (en) | 1972-07-21 |
| JPS5416166B1 (en) | 1979-06-20 |
| NL7116592A (en) | 1972-06-07 |
| NL160134B (en) | 1979-04-17 |
| DE2059950A1 (en) | 1972-06-15 |
| NL160134C (en) | 1979-09-17 |
| DE2059950B2 (en) | 1974-04-18 |
| BE776231A (en) | 1972-06-05 |
| LU64400A1 (en) | 1972-06-19 |
| CH538793A (en) | 1973-06-30 |
| SE364577B (en) | 1974-02-25 |
| AT315923B (en) | 1974-06-25 |
| IT943714B (en) | 1973-04-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |