GB1177186A - Improvements in or relating to Telecommunications Exchange Systems - Google Patents
Improvements in or relating to Telecommunications Exchange SystemsInfo
- Publication number
- GB1177186A GB1177186A GB1981368A GB1981368A GB1177186A GB 1177186 A GB1177186 A GB 1177186A GB 1981368 A GB1981368 A GB 1981368A GB 1981368 A GB1981368 A GB 1981368A GB 1177186 A GB1177186 A GB 1177186A
- Authority
- GB
- United Kingdom
- Prior art keywords
- time
- store
- change
- line
- sec
- 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
- H04L12/00—Data switching networks
- H04L12/50—Circuit switching systems, i.e. systems in which the path is physically permanent during the communication
- H04L12/52—Circuit switching systems, i.e. systems in which the path is physically permanent during the communication using time division techniques
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
1,177,186. Digital transmission systems. SIEMENS A.G. 26 April, 1968 [28 April. 1967], No. 19813/68. Heading H4P. In a data communication exchange system, signals lasting more than a certain time, e.g. clearing signals, are detected. Each incoming line is associated with a respective detector, the detectors being sampled sequentially by clock pulses. In a first embodiment of a detector the time of occurrence and the direction of a change in level of a received signal are stored, and the time stored is subtracted from the time of occurrence of the next clock pulse fed to the detector. The result indicates the duration of the signal. The clock pulses recur at 120 m.sec. intervals. If no change in level occurs in the next 120 m.sec., the time stored is subtracted from the time of the next clock pulse. When there has been no change in level for at least 210 m.sec. the line is cleared. In a second embodiment, each clock pulse causes a store to be read out and then a counter, which feeds the store, to be incremented. The contents of the counter and store are erased when a change in level occurs on the associated line. When the number read from the store reaches a given number, the line is cleared.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1967S0109623 DE1298537B (en) | 1967-04-28 | 1967-04-28 | Method for recognizing operating signals in a data switching system |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1177186A true GB1177186A (en) | 1970-01-07 |
Family
ID=7529665
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1981368A Expired GB1177186A (en) | 1967-04-28 | 1968-04-26 | Improvements in or relating to Telecommunications Exchange Systems |
Country Status (7)
Country | Link |
---|---|
BE (1) | BE714292A (en) |
CH (1) | CH472813A (en) |
DE (1) | DE1298537B (en) |
FR (1) | FR1570072A (en) |
GB (1) | GB1177186A (en) |
NL (1) | NL6805990A (en) |
SE (1) | SE333162B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3626375A (en) * | 1970-03-26 | 1971-12-07 | Burroughs Corp | Switching data set |
-
1967
- 1967-04-28 DE DE1967S0109623 patent/DE1298537B/en active Pending
-
1968
- 1968-04-02 CH CH487368A patent/CH472813A/en not_active IP Right Cessation
- 1968-04-26 SE SE567968A patent/SE333162B/en unknown
- 1968-04-26 NL NL6805990A patent/NL6805990A/xx unknown
- 1968-04-26 BE BE714292D patent/BE714292A/xx unknown
- 1968-04-26 GB GB1981368A patent/GB1177186A/en not_active Expired
- 1968-04-29 FR FR1570072D patent/FR1570072A/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
SE333162B (en) | 1971-03-08 |
BE714292A (en) | 1968-10-28 |
CH472813A (en) | 1969-05-15 |
DE1298537B (en) | 1969-07-03 |
NL6805990A (en) | 1968-10-29 |
FR1570072A (en) | 1969-06-06 |
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