GB1213569A - Improvements in or relating to data transmission apparatus - Google Patents
Improvements in or relating to data transmission apparatusInfo
- Publication number
- GB1213569A GB1213569A GB3959368A GB3959368A GB1213569A GB 1213569 A GB1213569 A GB 1213569A GB 3959368 A GB3959368 A GB 3959368A GB 3959368 A GB3959368 A GB 3959368A GB 1213569 A GB1213569 A GB 1213569A
- Authority
- GB
- United Kingdom
- Prior art keywords
- data
- character
- ratio
- counter
- characters
- 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
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0079—Receiver details
- H04L7/0083—Receiver details taking measures against momentary loss of synchronisation, e.g. inhibiting the synchronisation, using idle words or using redundant clocks
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
- Manipulation Of Pulses (AREA)
- Communication Control (AREA)
Abstract
1,213,569. Digital transmission systems. INTERNATIONAL BUSINESS MACHINES CORP. 19 Aug., 1968 [15 Sept., 1967], No. 39593/68. Heading H4P. In a data transmission system the transmitter includes means for determining the ratio of the number of data bit changes : the number of data characters in a stream of data to be transmitted, and for inserting a number of synchronizing bits in the data word stream if the ratio becomes so low that the receiver might lose synchronism. In the embodiment described the ratio must not fall below 1 : 16 over 96 characters. The data bits pass to a unit which delivers a pulse at each bit transition. The transitions are counted in a reversible counter of capacity 6. A second reversible counter, of capacity 16 Î 6 = 96, is stepped forward at character rate by clock pulses, but when neither it nor the transition counter is at zero it is stepped back by 16 in the duration of each character. Under these same conditions the transition counter is stepped back once per character. If the character counter ever becomes full when the transition counter is empty, i.e. if the ratio falls below 1:16 over any period of 96 characters, 6 sync. bits are inserted in the data character stream to be transmitted in order to maintain the ratio of the number of bit changes transmitted : the number of data characters transmitted equal to. 1 : 16.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1967J0034583 DE1295593B (en) | 1967-09-15 | 1967-09-15 | Method and circuit arrangement for digital message transmission with synchronization by level, frequency or phase changes and additional synchronous pulses |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1213569A true GB1213569A (en) | 1970-11-25 |
Family
ID=7205130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3959368A Expired GB1213569A (en) | 1967-09-15 | 1968-08-19 | Improvements in or relating to data transmission apparatus |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS4815361B1 (en) |
| BE (1) | BE720004A (en) |
| CH (1) | CH476429A (en) |
| DE (1) | DE1295593B (en) |
| FR (1) | FR1577788A (en) |
| GB (1) | GB1213569A (en) |
| NL (1) | NL159252B (en) |
| SE (1) | SE345055B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB738587A (en) * | 1952-08-06 | 1955-10-19 | Mini Of Supply | Synchronising arrangements for pulse communication systems |
| DE1212146B (en) * | 1963-06-10 | 1966-03-10 | Siemens Ag | Transmission system with pulse code modulated signals |
| DE1173932B (en) * | 1963-07-23 | 1964-07-16 | Telefunken Patent | Method for data transmission in which the coded message content consists of a phase difference between successive signals |
| US3463887A (en) * | 1963-11-07 | 1969-08-26 | Nippon Electric Co | Time-division multiplexed pcm transmission system |
| NL142035B (en) * | 1964-02-08 | 1974-04-16 | Philips Nv | TRANSMISSION SYSTEM FOR TRANSMISSION OF TWO-VALUED INFORMATION PULSES WITH SYNCHRONIZATION IN THE RECEIVER ON RECEIVED SIGNAL TRANSFERS. |
| DE1193086B (en) * | 1964-02-21 | 1965-05-20 | Telefunken Patent | Method for data transmission in which the information is transmitted in individual blocks |
-
1967
- 1967-09-15 DE DE1967J0034583 patent/DE1295593B/en not_active Withdrawn
-
1968
- 1968-08-19 GB GB3959368A patent/GB1213569A/en not_active Expired
- 1968-08-19 FR FR1577788D patent/FR1577788A/fr not_active Expired
- 1968-08-23 JP JP43059988A patent/JPS4815361B1/ja active Pending
- 1968-08-27 BE BE720004D patent/BE720004A/xx unknown
- 1968-09-11 NL NL6812935A patent/NL159252B/en unknown
- 1968-09-13 SE SE1235968A patent/SE345055B/xx unknown
- 1968-09-16 CH CH1382868A patent/CH476429A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| DE1295593B (en) | 1969-05-22 |
| FR1577788A (en) | 1969-08-08 |
| NL6812935A (en) | 1969-03-18 |
| NL159252B (en) | 1979-01-15 |
| SE345055B (en) | 1972-05-08 |
| JPS4815361B1 (en) | 1973-05-14 |
| CH476429A (en) | 1969-07-31 |
| BE720004A (en) | 1969-02-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |