GB1138259A - Multi-frequency code signalling method - Google Patents
Multi-frequency code signalling methodInfo
- Publication number
- GB1138259A GB1138259A GB3246567A GB3246567A GB1138259A GB 1138259 A GB1138259 A GB 1138259A GB 3246567 A GB3246567 A GB 3246567A GB 3246567 A GB3246567 A GB 3246567A GB 1138259 A GB1138259 A GB 1138259A
- Authority
- GB
- United Kingdom
- Prior art keywords
- digits
- sent
- group
- code
- july
- 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
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
- H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
- H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
- H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
- H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Telephonic Communication Services (AREA)
Abstract
1,138,259. Automatic exchange systems. INTERNATIONAL STANDARD ELECTRIC CORP. 14 July, 1967 [21 July, 1966], No. 32465/67. Heading H4K. In multifrequency code-signalling, e.g. between exchanges, pairs of digits are transmitted simultaneously, one in a 2-out-of-5 code, the other in a 2-out-of-6 code, 11 frequencies being employed in all. There are thus 5 surplus frequency pairs available in the second group, and these may be used in combination with 2 frequencies of the first group for supervisory and other special purposes. When signals are sent in immediate succession, as in the arrangement of Specification 1,030,188, a 4-frequency repetition signal is sent when a pair of digits are repeated. Also, when an odd number of digits are to be sent, the single final digit is supplemented by a surplus frequency pair from the second group.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEST025673 | 1966-07-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1138259A true GB1138259A (en) | 1968-12-27 |
Family
ID=7460650
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3246567A Expired GB1138259A (en) | 1966-07-21 | 1967-07-14 | Multi-frequency code signalling method |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE701598A (en) |
| DE (1) | DE1487986A1 (en) |
| GB (1) | GB1138259A (en) |
| NL (1) | NL6710050A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2087710A5 (en) * | 1970-05-28 | 1971-12-31 | Cit Alcatel |
-
1966
- 1966-07-21 DE DE19661487986 patent/DE1487986A1/en active Pending
-
1967
- 1967-07-14 GB GB3246567A patent/GB1138259A/en not_active Expired
- 1967-07-20 NL NL6710050A patent/NL6710050A/xx unknown
- 1967-07-20 BE BE701598D patent/BE701598A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| NL6710050A (en) | 1968-01-22 |
| BE701598A (en) | 1968-01-22 |
| DE1487986A1 (en) | 1969-02-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA922408A (en) | System of telecommunications whereby a number of subscribers use the available channels in common | |
| SE318914B (en) | ||
| GB1178028A (en) | Telegraph Signalling System | |
| GB1066160A (en) | Remote control system | |
| GB1105427A (en) | ||
| GB1138259A (en) | Multi-frequency code signalling method | |
| GB970938A (en) | Automatic telecommunication exchange systems | |
| GB1064250A (en) | Code checking circuit and multifrequency data receiver | |
| GB987291A (en) | Electrical communication apparatus | |
| GB996835A (en) | Multi-frequency code signalling method | |
| CA742311A (en) | Telephone signal reporting system | |
| CA807313A (en) | Telephone reporting system | |
| GB759685A (en) | Improvements in and relating to coding devices for use in automatic telephone exchanges | |
| CA809749A (en) | Key telephone system signaling circuit | |
| CA810267A (en) | Telephone signaling system including carrier frequency transmission on voice frequency loaded pairs | |
| GB1097080A (en) | Circuit arrangement for supervising electrical pulses transmitted over a number of channels | |
| CS184857B1 (en) | Method and connection for transmission of the binar signal sequences in the time divided communication networks | |
| GB1269760A (en) | Improvements in or relating to coin-operated telecommunications systems | |
| CA666048A (en) | Locking terminal block | |
| AU403193B2 (en) | Subscriber communication system | |
| CA670291A (en) | Telegraph signal arrangement for a telephone system | |
| AT285691B (en) | Transmission system for the mutual transmission of pulse-coded messages, in particular data, between different subscriber stations | |
| AU411776B2 (en) | Improvements to telecommunication exchange line identification systems | |
| CA792857A (en) | Communication system signaling and testing equipment | |
| CA802336A (en) | Telephone signaling system including carrier frequency transmission on voice frequency loaded pairs |