GB1238103A - - Google Patents
Info
- Publication number
- GB1238103A GB1238103A GB1238103DA GB1238103A GB 1238103 A GB1238103 A GB 1238103A GB 1238103D A GB1238103D A GB 1238103DA GB 1238103 A GB1238103 A GB 1238103A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sub
- signal
- lines
- rectifiers
- station
- 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
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/26—Devices for calling a subscriber
- H04M1/30—Devices which can set up and transmit only one digit at a time
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/26—Devices for calling a subscriber
- H04M1/515—Devices for calling a subscriber by generating or selecting signals other than trains of pulses of similar shape, or signals other than currents of one or more different frequencies, e.g. generation of dc signals of alternating polarity, coded pulses or impedance dialling
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems
Abstract
1,238,103. Intercommunication systems. INTERNATIONAL STANDARD ELECTRIC CORP. 5 June, 1969 [7 June, 1968], No .28431/69. Heading H4K. A telecommunication system includes a plurality of sub-stations connected to a common multiconductor which carries on one line a general A.C. selection signal applied to two changeover contacts through two oppositely poled rectifiers so that the A.C. signal can be selectively applied to two other lines by operation of the contacts wherein this signal causes an evaluation unit to operate a connecting unit to connect the sub-station to the speech lines. The changeover contacts, rectifiers evaluation and connection units are housed at the sub-station. As shown an audio frequency general selection signal is applied via line 1 to the connection between rectifiers Gl5<SP>1</SP>, Gl6<SP>1</SP> in each sub-station and a halfwave A.C. signal selectively transmitted on lines 2, 3 by operation of one of keys T1<SP>1</SP>-T4<SP>1 </SP>. Receiving rectifiers Gl1<SP>1</SP>-Gl4<SP>1</SP> are connected to evaluating units W1<SP>1</SP>, W2<SP>1</SP> in any desired combination so that each sub-station responds to its own pattern of transmitted A.C. signals. An enabling line F1<SP>1</SP> connects units W1<SP>1</SP>, W2<SP>1</SP> so that when W1<SP>1</SP> responds it enables W2<SP>1</SP> so that it can receive a second signal within a fixed time. On receipt of a signal, connecting unit B<SP>1</SP> is operated to connect the transmission device Ue<SP>1</SP> to the line through contacts a<SP>1</SP>, b<SP>1</SP>. More than two digits may be used for selection and the number of evaluating units is increased accordingly, alternatively a further four changeover contacts may be provided transmitting on to lines 4, 5 of the multiconductor. Group and collective call facilities can be obtained by the use of additional keys at the sub-stations. Multiple seizing of the multi-conductor lines can be prevented using known circuits. The evaluating and connection units can use either relays or electronic switches. In telemetering and like installations, some of the stations may be adapted only to be called.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT543668A AT308846B (en) | 1968-06-07 | 1968-06-07 | Circuit arrangement for telecommunications equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1238103A true GB1238103A (en) | 1971-07-07 |
Family
ID=3575776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1238103D Expired GB1238103A (en) | 1968-06-07 | 1969-06-05 |
Country Status (7)
| Country | Link |
|---|---|
| AT (1) | AT308846B (en) |
| BE (1) | BE734136A (en) |
| DE (1) | DE1927721A1 (en) |
| FR (1) | FR2010366A1 (en) |
| GB (1) | GB1238103A (en) |
| NL (1) | NL6908704A (en) |
| SE (1) | SE346440B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2183968A (en) * | 1985-11-27 | 1987-06-10 | Rauland Corp | Intercommunication system |
-
1968
- 1968-06-07 AT AT543668A patent/AT308846B/en not_active IP Right Cessation
-
1969
- 1969-05-30 DE DE19691927721 patent/DE1927721A1/en active Pending
- 1969-06-05 SE SE794169A patent/SE346440B/xx unknown
- 1969-06-05 GB GB1238103D patent/GB1238103A/en not_active Expired
- 1969-06-06 NL NL6908704A patent/NL6908704A/xx unknown
- 1969-06-06 FR FR6918676A patent/FR2010366A1/fr not_active Withdrawn
- 1969-06-06 BE BE734136D patent/BE734136A/xx unknown
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2183968A (en) * | 1985-11-27 | 1987-06-10 | Rauland Corp | Intercommunication system |
| US4744103A (en) * | 1985-11-27 | 1988-05-10 | Rauland-Borg Corporation | Computer controlled multi-link communication system |
| GB2183968B (en) * | 1985-11-27 | 1989-11-08 | Rauland Corp | Computer controlled multi-link communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1927721A1 (en) | 1969-12-11 |
| BE734136A (en) | 1969-12-08 |
| NL6908704A (en) | 1969-12-09 |
| FR2010366A1 (en) | 1970-02-13 |
| AT308846B (en) | 1973-07-25 |
| SE346440B (en) | 1972-07-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| 435 | Patent endorsed 'licences of right' on the date specified (sect. 35/1949) | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |