GB1272978A - A data transmission system - Google Patents
A data transmission systemInfo
- Publication number
- GB1272978A GB1272978A GB5916169A GB5916169A GB1272978A GB 1272978 A GB1272978 A GB 1272978A GB 5916169 A GB5916169 A GB 5916169A GB 5916169 A GB5916169 A GB 5916169A GB 1272978 A GB1272978 A GB 1272978A
- Authority
- GB
- United Kingdom
- Prior art keywords
- area
- station
- stations
- loop
- around
- 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
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/42—Loop networks
- H04L12/423—Loop networks with centralised control, e.g. polling
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Small-Scale Networks (AREA)
- Time-Division Multiplex Systems (AREA)
Abstract
1,272,978. Data transmission systems. INTERNATIONAL BUSINESS MACHINES CORP. 4 Dec., 1969 [20 Dec., 1968], No. 59161/69. Heading H4P. [Also in Division G4] A data transmission system comprises a central station 1 and a plurality of area stations 2- 17 arranged in a closed loop around which signals are transmitted; each station 2-17 includes a by-pass (not shown in Fig. 1) that can be broken when the corresponding area station 2-17 receives or transmits signals; when a number of area stations simultaneously request communication with the central station 1, then these are interrogated sequentially around the loop. As described in relation to airline seat reservation, the stations 1-17 are interconnected through modulators 18, 20, 22, 24 and demodulators 19, 19, 21, 23, 25. All signals are transmitted counterclockwise around the loop in serial form, but are connected to parallel mode in each area station 2-17. When the central station 1 wishes to receive data, it sends a POLL signal around the loop, whereon those area stations desiring communication break their by-pass. Each sends a RESET signal, so reconnecting the by-pass of every calling area station except that nearest to the output of the central station 1, for example, area station 4. Data communication then occurs between area station 4 and central station 1. Communication then proceeds sequentially with the remaining calling area stations counterclockwise around the loop, by successive transmission of POLL and of RESET signals. In an alternative embodiment, communication proceeds sequentially with calling area stations, clockwise around the loop. The central station 1 may alternatively exchange data with any selected area station 2-17 by alerting all area stations 2-17 with a CALL signal, followed by an address signal for the selected area station, that will break the corresponding by-pass. Figs. 2 and 3 (not reproduced) illustrate area stations that are suitable for sequential communication between area stations and the central station, respectively counterclockwise and clockwise around the loop.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE1770468A SE324668B (en) | 1968-12-20 | 1968-12-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1272978A true GB1272978A (en) | 1972-05-03 |
Family
ID=20303886
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5916169A Expired GB1272978A (en) | 1968-12-20 | 1969-12-04 | A data transmission system |
Country Status (5)
Country | Link |
---|---|
JP (1) | JPS4839845B1 (en) |
DE (1) | DE1963858A1 (en) |
FR (1) | FR2026636A1 (en) |
GB (1) | GB1272978A (en) |
SE (1) | SE324668B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4433700A1 (en) * | 1994-09-21 | 1996-03-28 | Siemens Ag | Power supply conductor from the conductor foil of the foil winding of a power transformer |
-
1968
- 1968-12-20 SE SE1770468A patent/SE324668B/xx unknown
-
1969
- 1969-12-04 GB GB5916169A patent/GB1272978A/en not_active Expired
- 1969-12-11 FR FR6942811A patent/FR2026636A1/fr not_active Withdrawn
- 1969-12-16 JP JP10064969A patent/JPS4839845B1/ja active Pending
- 1969-12-19 DE DE19691963858 patent/DE1963858A1/en active Pending
Also Published As
Publication number | Publication date |
---|---|
SE324668B (en) | 1970-06-08 |
FR2026636A1 (en) | 1970-09-18 |
DE1963858A1 (en) | 1970-07-02 |
JPS4839845B1 (en) | 1973-11-27 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |