GB2009472A - Method of and apparatus for checking signal generation for digital transmission system - Google Patents
Method of and apparatus for checking signal generation for digital transmission systemInfo
- Publication number
- GB2009472A GB2009472A GB7845850A GB7845850A GB2009472A GB 2009472 A GB2009472 A GB 2009472A GB 7845850 A GB7845850 A GB 7845850A GB 7845850 A GB7845850 A GB 7845850A GB 2009472 A GB2009472 A GB 2009472A
- Authority
- GB
- United Kingdom
- Prior art keywords
- test signal
- signal
- transmission system
- checking
- pseudo
- 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.)
- Withdrawn
Links
- 230000005540 biological transmission Effects 0.000 title abstract 5
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 title 1
- 238000003780 insertion Methods 0.000 abstract 1
- 230000037431 insertion Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/40—Monitoring; Testing of relay systems
- H04B17/407—Monitoring; Testing of relay systems without selective localization
- H04B17/408—Monitoring; Testing of relay systems without selective localization using successive loop-backs
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Dc Digital Transmission (AREA)
- Time-Division Multiplex Systems (AREA)
- Maintenance And Management Of Digital Transmission (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
In generating checking signals for locating faults in a digital transmission system, having a predetermined frame bit period length, by means of loop switching in intermediate regenerators of the system, a test signal is scrambled before transmission as are other signals for transmission in order to enhance the energy distribution in the transmitted signal. Problems then exist in generating an appropriate test signal by means of a multi-stage pseudo-random generator such that the test signal will be readily recoverable at the receiving end. A pseudo-random generator having a stages and a period of 2<a>-jbits is used to produce the test signal so that the checking signal period (with a predetermined scrambling mode) is equal to substantially a whole number of frame periods of the transmission system. The pseudo-random generator provides insertion of a frame code word into the test signal so as to avoid overlap with a loop closure command in the checking signal. <IMAGE>
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2752541A DE2752541C2 (en) | 1977-11-24 | 1977-11-24 | Test signal generation for fault location |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2009472A true GB2009472A (en) | 1979-06-13 |
Family
ID=6024560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7845850A Withdrawn GB2009472A (en) | 1977-11-24 | 1978-11-23 | Method of and apparatus for checking signal generation for digital transmission system |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS5482910A (en) |
| DE (1) | DE2752541C2 (en) |
| FR (1) | FR2410397A1 (en) |
| GB (1) | GB2009472A (en) |
| IT (1) | IT1100180B (en) |
| NL (1) | NL7811566A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0016416B1 (en) * | 1979-03-22 | 1983-08-31 | Siemens Aktiengesellschaft | Address-free fault localisation |
| DE3004767B1 (en) * | 1980-02-08 | 1981-05-21 | Siemens AG, 1000 Berlin und 8000 München | Method for combined monitoring and fault location in transmission links for digital signals and arrangement for carrying out the method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2649145C3 (en) * | 1976-10-28 | 1980-07-10 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Test signal generator for fault location |
| DE2703621C3 (en) * | 1977-01-28 | 1981-06-11 | Siemens AG, 1000 Berlin und 8000 München | Test signal generator for a locating device to locate faulty regenerator fields |
-
1977
- 1977-11-24 DE DE2752541A patent/DE2752541C2/en not_active Expired
-
1978
- 1978-11-17 FR FR7832516A patent/FR2410397A1/en active Granted
- 1978-11-22 IT IT30045/78A patent/IT1100180B/en active
- 1978-11-22 JP JP14357778A patent/JPS5482910A/en active Pending
- 1978-11-23 GB GB7845850A patent/GB2009472A/en not_active Withdrawn
- 1978-11-24 NL NL7811566A patent/NL7811566A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| DE2752541B1 (en) | 1979-04-26 |
| IT7830045A0 (en) | 1978-11-22 |
| FR2410397A1 (en) | 1979-06-22 |
| NL7811566A (en) | 1979-05-28 |
| IT1100180B (en) | 1985-09-28 |
| DE2752541C2 (en) | 1979-12-20 |
| JPS5482910A (en) | 1979-07-02 |
| FR2410397B1 (en) | 1983-06-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| NO964260L (en) | Method and apparatus for transmitting and receiving encrypted signals | |
| ES469793A1 (en) | Message signal scrambling apparatus | |
| JPS5674659A (en) | Logic signal observing apparatus | |
| JPS56126352A (en) | Data transmission device | |
| NO923933D0 (en) | PROCEDURE FOR AA SYNCHRONIZE THE PSEUDO-CASUAL BINARY SEQUENCE IN A DESCRAMBLER | |
| NO179469C (en) | Method and apparatus for preventing external detection of signal transmission | |
| JPS5243317A (en) | Scramble device and disscrable device when transmitting image signal | |
| GB2009472A (en) | Method of and apparatus for checking signal generation for digital transmission system | |
| JPS54129901A (en) | Secret communication system | |
| EP0232043A3 (en) | Scrambling data signals | |
| JPS57210748A (en) | Data transmission system | |
| JPS5253638A (en) | Mimic equipment of input/output unit | |
| FR2379123A1 (en) | Electronic instructional unit including TV receiver - has memory, keyboard, time:base and timer units, random number generator and binary value injector | |
| JPS5512239A (en) | Wave-form switching apparatus | |
| JPS5383760A (en) | Branching method for optical transmission | |
| JPS53107480A (en) | Method and apparatus for generating hydrogen by light metabolism | |
| JPS55147887A (en) | Synchronism re-acquisition system | |
| JPS5492144A (en) | Generator for random number | |
| JPS522318A (en) | Magnetic regenerator of video signals | |
| JPS5616359A (en) | Facsimile device | |
| JPS5649976A (en) | Hour-striking device | |
| JPS5510610A (en) | Method and device for interlacing display of display unit | |
| JPS56127253A (en) | Test pattern generator | |
| JPS54142927A (en) | Transmitter of telautogram information | |
| JPS53121542A (en) | Test method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |